Water and Sediment Quality in the Yukon River Basin, 

Alaska, During Water Year 2004 

Open-File Report 2006-1258 

U.S. Department of the Interior 

U.S. Geological Survey 
Cover photograph: U.S. Geological Survey scientist collecting a water-quality sample 

from under the ice of the Yukon River near the Dalton Highway Bridge in central Alaska 
Water and Sediment Quality in the Yukon River Basin, 

Alaska, During Water Year 2004 

Edited By Paul F. Schuster 

Open-File Report 2006-1258 

U.S. Department of the Interior 

U.S. Geological Survey 
U.S. Department of the Interior 

Dirk Kempthorne, Secretary 

U.S. Geological Survey 

Mark D. Meyers, Director 

U.S. Geological Survey, Boulder, Colorado 2006 

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Contents 

Overview ...................................................................................................................................................................vi

Acknowledgments ..................................................................................................................................................vi

CHAPTER 1 - Introduction.......................................................................................................................................1

CHAPTER 2 - Fixed-Station Samples ....................................................................................................................4

CHAPTER 3 - Dissolved Organic Carbon (DOC) Characterization .................................................................22

CHAPTER 4 - Dissolved Major Cations and Trace Elements..........................................................................25

CHAPTER 5 - Mercury Analyses..........................................................................................................................43

CHAPTER 6 - Dissolved Gasses and Dissolved Inorganic Carbon................................................................45

CHAPTER 7- Sediment Chemistry........................................................................................................................47

CHAPTER 8 - Sediment Mineralogy ....................................................................................................................52

CHAPTER 9 - Sediment Concentration and Percent Organic Matter (OM) ................................................58

CHAPTER 10 – Total Particulate Carbon (TPC), Particulate Inorganic Carbon (PIC), Particulate 

Organic Carbon (POC), and Total Particulate Nitrogen (TPN)................................................................60

CHAPTER 11 - Isotopic Analysis of Suspended Particulate Organic matter (POM) ..................................62

CHAPTER 12 - Uranium Isotopes.........................................................................................................................64

References Cited....................................................................................................................................................66

Figures 

1. Map showing location of fixed-station water-quality sampling sites in the Yukon River Basin ..........3 

Tables 

1. Summary of site characteristics at five fixed stations in the Yukon River Basin .................................. 4

2. USGS National Water Quality Laboratory analyses-Yukon River at Eagle, Alaska ................................5 

3. USGS National Water Quality Laboratory analyses-Porcupine River near Fort Yukon, Alaska...........8

4. USGS National Water Quality Laboratory analyses-Yukon River near Stevens Village, Alaska........11

5. USGS National Water Quality Laboratory analyses-Tanana River at Nenana, Alaska .......................15

6. USGS National Water Quality Laboratory analyses-Yukon River at Pilot Station, Alaska ...............19

7. Dissolved organic carbon concentrations and fractionation analyses from fixed-station sampling 

sites in the Yukon River Basin .......................................................................................................................23 

8. Selected dissolved major cations and trace elements from fixed-station sampling sites in the 

Yukon River Basin............................................................................................................................................ 26 

9. Mercury and methylmercury concentrations from fixed-station sampling sites in the Yukon River 

Basin ..................................................................................................................................................................44 

10. Carbon dioxide, methane, and dissolved inorganic carbon concentrations from fixed-station 

sampling sites in the Yukon River Basin......................................................................................................46 

11. Sediment chemistry data from fixed-station sampling sites in the Yukon River Basin ......................48 

12. Sediment mineralogy data from fixed-station sampling sites in the Yukon River Basin.....................53 

13. Suspended sediment concentrations and percent organic matter in sediment from fixed-station 

sampling sites in the Yukon River Basin......................................................................................................59

iii
14. Total particulate carbon, particulate inorganic carbon, particulate organic carbon, and total 

particulate nitrogen concentrations from fixed-station sampling sites in the Yukon River Basin ...61

15. Suspended sediment isotopic data from fixed-station sampling sites in the Yukon River Basin......63 

16. Uranium concentration and 234U/238U isotopic activity ratio analyses in water samples from fixedstation sampling sites in the Yukon River Basin ........................................................................................65

iv
Conversion Factors 

_________________________________________________________ _ __ 

Multiply by To obtain 

 Length

nanometer (nm) 3.937 x10-8 inch 

micrometer (μm) 3.937 x10-5 inch 

millimeter (mm) 3.937 x10-2 inch 

centimeter (cm) 3.937 x10-1 inch 

meter (m) 3.281 foot (ft) 

 Area

square kilometer (km2

) 3.861 x10-1 square mile 

 Flow

cubic meter per second (m3

/s) 35.31 cubic foot per second (ft3/s) 

 Volume

microliter (μL) 3.382 x10-5 once, fluid 

milliliter (mL) 3.382 x10-2 once, fluid 

liter (L) 2.642 x10-1 gallon 

 Mass

microgram (μg) 3.527 x10-8 ounce, avoirdupois 

milligram (mg) 3.527 x10-5 ounce, avoirdupois 

Degree Celsius (ο

C) may be converted to degree Fahrenheit (οF) by using the following equation: 

F=1.8 (ο

C) + 32 

Vertical coordinate information is referenced to the North American Vertical Datum of 1988 

(NAVD 88) 

Water year is the 12-month period October 1 through September 30 and is designated by the calendar year in which it 

ends. 

Horizontal coordinate information is referenced to the North American Datum of 1983 (NAD 83) 

 

v
Overview 

This report contains water-quality and sediment-quality data from samples collected in the 

Yukon River Basin from March through September during the 2004 water year (WY). Samples were 

collected throughout the year at five stations in the basin (three on the main stem Yukon River, one 

each on the Tanana and Porcupine Rivers). A broad range of physical, chemical, and biological 

analyses are presented. 

Acknowledgments 

The USGS Nation Stream Quality Accounting Network (NASQAN) and the National 

Research Program would like to thank the USGS Alaska Science Center, Water Discipline, in 

Anchorage and the Field office in Fairbanks. Without their field expertise and continuous logistical 

support this work would not have been possible. 

vi
CHAPTER 1 - Introduction 

by Paul F. Schuster 

The U.S. Geological Survey (USGS) National Stream Quality Accounting Network 

(NASQAN) has completed a 5-year (2001-2005) study of the water quality of the Yukon River 

Basin (330,000 square miles) from the Yukon River headwaters in Canada to the Bering Sea (Nelson 

and others, 2001). Climatic warming of the Yukon River Basin is resulting in lengthening of the 

growing season, melting of permafrost, and deepening of the soil active layer (Osterkamp, 2003; 

Miller and others, 2003; BESIS, 1997). These and related processes are anticipated to result in 

changes in water and sediment chemistry and discharge in upcoming decades. As a first step in 

understanding these changes, measurements of water discharge and water and sediment chemistry 

are being made on the upper, middle, and lower Yukon River and on the Tanana and Porcupine 

Rivers (Schuster, 2003, 2005a, 2005b). 

A thorough description of the basin is given in Brabets and others (2000). Additional 

information about the study can be found at http://ak.water.usgs.gov/yukon/. Schuster (2003) 

describes the objectives and approach of the study and provides a brief description of the basin (fig. 

1), and summarizes sediment and water-quality data for Water Year (WY) 2001. Sediment and 

water-quality data for WY 2002 and 2003 are given in Schuster (2005a, 2005b), respectively. A 

broad range of constituents were measured in fixed-station samples during the 5-year study, 

including dissolved major ions, dissolved and total recoverable nutrients, dissolved and sedimentassociated trace elements, biological indicators (such as dissolved oxygen) and the stable isotopic 

composition of nitrogen, carbon, and sulfur of particulate organic matter, and various forms of 

organic carbon. Because of its extensive wetlands, the Yukon River exhibits high organic carbon 

1
concentrations in contrast to other large rivers. Both the chemical composition and concentration of 

organic carbon are expected to change with melting permafrost. In addition to this work, intensive 

sampling campaigns of the entire reach of the Yukon River from headwaters above Whitehorse, 

Yukon Territory, to Pilot Station, Alaska, during high flow in early June and low flow in late August 

were completed during the years 2002-2004. In 2005, intensive sampling campaigns were 

conducted at the fixed stations and several other key locations in the basin for the duration of the 

spring snowmelt peak (approximately mid May to mid June). The intensive sampling will address 

process-based questions about the water quality of the basin. 

The purpose of this report is to compile and report the water and sediment quantity and 

quality data collected during WY 2004. The sample-collection methods and the laboratory analytical 

methods are described in Schuster (2003). Because many of the results are research-oriented, they 

are not contained in the USGS National Water Information System (NWIS) database, but are 

available to the public upon request (pschuste@usgs.gov). This report, the fourth in a series of 

annual reports for the 5-year study, is being released both in paper and electronic format to meet 

both archival and data dissemination objectives. 

2
Figure 1. Map showing location of fixed-station water-quality sampling sites in the Yukon River Basin. 

Identification numbers are listed in Table 1.

3
4

CHAPTER 2 – Fixed-Station Samples 

by Timothy P. Brabets 

The following section provides a summary of the Yukon River Basin site characteristics 

(table 1). References for the description of sample collection and processing of samples for various 

water-quality constituents are given in Schuster (2003). Sample analysis results for field 

measurements, major ions, nutrients, organic and inorganic carbon, trace elements, suspended 

sediment concentrations, and trace elements in suspended sediments during WY 2004 are given in 

tables 2-6. The data provided in this section also are available from the USGS NWIS database 

(http://waterdata.usgs.gov/nwis/). 

Table 1. Summary of site characteristics at five fixed stations in the Yukon River Basin

[Station ID, U.S. Geological Survey station identification number, streamflow and water-quality measurements collected at the same station; ID on 

Figure 1, refer to figure 1 for station ID locations; sq.mi., square miles; NAD 83, North American Datum of 1983; NAVD 88, North American 

Vertical Datum of 1988] 

Station ID ID on 

Figure 1 Station Name Latitude (NAD 83) 

Longitude 

(NAD 83) 

Drainage 

Area 

(sq. mi.) 

Datum 

(feet above 

NAVD 88) 

15356000 1 Yukon River at 

Eagle, Alaska 

64°47’21” 141°12’00” 113,500 850 

15389000 2 Porcupine River near 

Fort Yukon, Alaska 

66°59’25” 143°08’26” 29,500 520 

15453500 3 Yukon River near 

Stevens Village, 

Alaska 

65°52’30” 149°43’13” 196,300 240 

15515500 4 Tanana River at 

Nenana, Alaska 

64°33’53” 149°05’39” 25,600 338.5 

15565447 5 Yukon River at Pilot 

Station, Alaska 

61°56’01” 162°52’59” 321,000 20 
Table 2. USGS National Water Quality Laboratory analyses- Yukon River at Eagle, Alaska 

[All measurements in milligrams per liter and micrograms per liter are dissolved. Station ID, station identification number, refer to Table 1 for description and Figure 1 for location; ft3/s , cubic feet per 

second; °C, degrees Celsius; mg/L, milligram per liter; NTU, Nephelometric turbidity unit; Hg; mercury, <; less then detection limit; --, missing value; mm, millimeter; lab, laboratory; fld, field; μS/cm, 

microsiemen per centimeter at 25 degrees Celsius; cm, centimeter; UV, Ultraviolet; nm, nanometer; Flt, filtered; NO2, nitrite; NO3, nitrate; wat flt susp., water filtered suspended; μg/L, microgram per 

liter; Dis fet lab, dissolved fixed end-point titration in laboratory; Dis tot IT, dissolved total incremental titration; Dis IT field, dissolved incremental titration in the field; %, percent; E, estimated; M, presence verified but not quantified; diam., diameter; Susp., Suspended] 

Station ID Date/Time Discharge (ft3/s) Solids, Residue at 180°C, dissolved (mg/L) Turbidity Lab Hach (NTU) Barometric Pressure (mm of Hg) Oxygen, dissolved (mg/L) pH, Field (Standard Units) pH, Lab (Standard Units) 

15356000 4/13/04 12:30 19,400 154 -- 758 11.1 7.7 8.0 15356000 5/26/04 13:00 220,000 112 160 -- -- 7.0 7.8 15356000 6/17/04 10:30 205,000 118 99 -- 9.9 7.9 7.9 15356000 6/30/04 16:20 187,000 131 920 743 9.2 8.2 8.0 15356000 7/20/04 15:00 125,000 132 1,000 737 9.8 8.0 7.8 15356000 8/19/04 15:10 116,000 109 840 737 -- 8.0 7.8 15356000 9/6/04 11:00 84,500 137 63 -- -- 7.8 7.9 

Station ID Date/Time 

Specific 

Conductance, 

Lab (μS/cm) 

Specific 

Conductance, 

Fld (μS/cm) 

Air Temp 

(°C) 

Water Temp. 

(°C) 

UV Absorbance 

254 nm, Flt 

(units/cm) 

UV Absorbance 

280 nm, Flt (units/cm)

Calcium 

(mg/L) 

Magnesium 

(mg/L) 

15356000 4/13/04 12:30 251 240 -- 0.0 0.031 0.021 35.4 9.84 15356000 5/26/04 13:00 168 -- -- 10.0 0.449 0.355 24.1 6.42 15356000 6/17/04 10:30 192 206 -- 15.0 0.128 0.095 28.5 7.92 15356000 6/30/04 16:20 196 188 27.2 17.9 0.049 0.036 28.1 7.20 15356000 7/20/04 15:00 213 208 -- 16.2 0.034 0.024 30.9 7.71 15356000 8/19/04 15:10 218 210 -- 15.9 0.034 0.025 29.9 7.57 15356000 9/6/04 11:00 227 225 6.8 9.3 0.056 0.040 31.5 8.20 

5
Table 2. USGS National Water Quality Laboratory Analyses- Yukon River at Eagle, Alaska—Continued

Station ID Date/Time Chloride (mg/L) Fluoride (mg/L) Silica (mg/L) Sulfate (mg/L) Nitrogen, Ammonia, dissolved (mg/L) Nitrogen, Ammonia + Organic, dissolved (mg/L) Nitrogen, Ammonia + Organic, Total (mg/L) 

15356000 4/13/04 12:30 0.75 <0.2 6.88 31.3 <0.010 E0.06 E0.06 15356000 5/26/04 13:00 0.60 <0.2 5.13 22.2 E0.005 0.28 0.74 15356000 6/17/04 10:30 0.45 <0.2 6.30 29.9 <0.010 E0.07 0.27 

15356000 6/30/04 16:20 0.78 <0.2 5.60 30.9 <0.010 E0.05 0.58 15356000 7/20/04 15:00 1.06 <0.2 5.78 30.7 <0.010 <0.10 0.45 

15356000 8/19/04 15:10 1.09 <0.2 5.33 37.6 <0.010 E0.07 0.36 

15356000 9/6/04 11:00 0.92 0.2 5.87 34.9 E0.008 E0.10 0.20 

Station ID Date/Time 

Nitrogen, NO + 2

NO3, dissolved 

(mg/L) 

Nitrogen, Nitrite 

dissolved 

(mg/L) 

Nitrogen, 

 particulate wat flt 

susp. (mg/L) 

Phosphorus, 

dissolved (mg/L) 

Ortho-phosphorus 

(mg/L) 

Phosphorus, 

Total (mg/L) 

Carbon Inorg. + 

Organic Partic. 

Total (mg/L) 

15356000 4/13/04 12:30 0.088 <0.002 <0.02 <0.004 <0.006 0.004 <0.1 15356000 5/26/04 13:00 0.031 0.002 0.42 0.008 <0.006 0.64 8.4 15356000 6/17/04 10:30 0.034 <0.002 0.15 <0.04 <0.006 0.32 4.1 15356000 6/30/04 16:20 0.031 <0.002 E0.43 E0.002 <0.006 1.53 E32.6 15356000 7/20/04 15:00 0.027 E0.001 0.28 <0.004 E0.003 1.17 22.7 15356000 8/19/04 15:10 0.022 E0.001 0.17 <0.004 <0.006 E0.81 11.9 

15356000 9/6/04 11:00 0.028 E0.001 0.13 <0.004 <0.006 0.26 6.6 

Station ID Date/Time Potassium (mg/L) Sodium (mg/L) Alkalinity, Dis fet lab, as CaCO3 (mg/L) Alkalinity, Dis tot IT, Field (mg/L) Bicarbonate, Dis IT Field (mg/L) Carbonate, Dis IT, Field (mg/L) 

15356000 4/13/04 12:30 1.08 3.05 101 95 116 0 15356000 5/26/04 13:00 0.95 1.75 61 56 73 0 15356000 6/17/04 10:30 0.99 2.11 72 67 81 0 15356000 6/30/04 16:20 1.71 2.67 75 73 89 0 15356000 7/20/04 15:00 1.84 3.13 80 78 95 0 15356000 8/19/04 15:10 1.74 2.94 80 71 85 0 15356000 9/6/04 11:00 1.52 3.20 83 74 91 0 

6
Table 2. USGS National Water Quality Laboratory Analyses- Yukon River at Eagle, Alaska—Continued

Station ID Date/Time Molybdenum (μg/L) Nickel (μg/L) Selenium (μg/L) Silver (μg/L) Strontium (μg/L) Vanadium (μg/L) Zinc (μg/L) Uranium, natural (μg/L) Sediment, Susp. (Sieve diam. % < 0.062mm) 

Station ID Date/Time Carbon Inorganic, Partic. Total (mg/L) Carbon, Organic dissolved (mg/L) Carbon, Organic Particulate Total (mg/L) Aluminum (μg/L) Antimony (μg/L) Arsenic (μg/L) Barium (μg/L) 

15356000 4/13/04 12:30 <0.1 1.5 <0.1 2 E0.11 0.4 51 15356000 5/26/04 13:00 3.1 8.6 5.3 39 E0.18 0.5 36 15356000 6/17/04 10:30 1.2 4.7 2.9 26 E0.19 0.6 44 15356000 6/30/04 16:20 E23.0 2.1 E9.6 27 0.28 0.6 37 15356000 7/20/04 15:00 17.9 1.7 4.8 22 0.28 0.6 41 15356000 8/19/04 15:10 7.0 0.9 4.9 21 0.25 0.5 40 15356000 9/6/04 11:00 3.4 2.1 3.2 15 E0.17 0.6 40 

Station ID Date/Time Beryllium (μg/L) Boron (μg/L) Cadmium (μg/L) Chromium (μg/L) Cobalt (μg/L) Copper (μg/L) Iron (μg/L) Lead (μg/L) Lithium (μg/L) Manganese (μg/L) 

15356000 4/13/04 12:30 <0.06 8 E0.02 <0.8 0.094 0.8 E3 <0.08 2.3 1.5 15356000 5/26/04 13:00 <0.06 8 0.05 <0.8 0.134 3.8 93 E0.07 2.0 7.0 15356000 6/17/04 10:30 <0.06 E8 E0.02 1.0 0.106 1.7 18 <0.08 2.3 1.9 15356000 6/30/04 16:20 <0.06 12 <0.04 <0.8 0.137 1.3 E3 E0.06 3.2 0.6 15356000 7/20/04 15:00 <0.06 16 <0.04 <0.8 0.129 1.0 <6 <0.08 3.2 0.7 15356000 8/19/04 15:10 <0.06 14 <0.04 <0.8 0.108 1.1 <6 <0.08 3.1 0.7 15356000 9/6/04 11:00 <0.06 24 <0.04 <0.8 0.100 1.4 E4 <0.08 3.2 2.7 

Sediment, 

Susp. (mg/L) 

15356000 4/13/04 12:30 1.3 1.13 0.6 <0.2 164 0.4 1.6 1.12 74 2 15356000 5/26/04 13:00 0.8 2.88 <0.4 <0.2 97.1 0.5 1.6 0.65 61 593 15356000 6/17/04 10:30 1.0 1.52 0.5 <0.2 112 0.6 0.7 0.83 53 383 15356000 6/30/04 16:20 1.6 1.07 E0.4 <0.2 117 0.6 E0.5 0.90 88 1,490 15356000 7/20/04 15:00 1.8 1.52 0.5 <0.2 145 0.6 <0.6 0.96 89 1,490 15356000 8/19/04 15:10 1.7 0.91 0.5 <0.2 141 0.6 E0.5 0.87 90 1,260 15356000 9/6/04 11:00 1.6 1.27 0.6 <0.2 147 0.4 1.2 1.04 72 314 

7
Table 3. USGS National Water Quality Laboratory Analyses- Porcupine River near Fort Yukon, Alaska 

[Station ID, station identification number, refer to Table 1 for description and Figure 1 for location; ft3/s, cubic feet per second; °C, degrees Celsius; mg/L, milligram per liter; NTU, Nephelometric 

turbidity unit; Hg; mercury, <; less then detection limit; --, missing value; mm, millimeter; lab, laboratory; fld, field; μS/cm, microsiemen per centimeter at 25 degrees Celsius; cm, centimeter; UV, Ultraviolet; NM, nanometer; Flt, filtered; NO2, nitrite; NO3, nitrate; wat flt susp., water filtered suspended; μg/L, microgram per liter; Dis fet lab, dissolved fixed end-point titration in laboratory; Dis tot 

IT, dissolved total incremental titration; Dis IT field, dissolved incremental titration in the field; %, percent; E, estimated; M, presence verified but not quantified; diam., diameter; Susp., Suspended] 

Station ID Date/Time Discharge (ft3/s) Solids, Residue at 180°C, dissolved (mg/L) Turbidity Lab Hach (NTU) Barometric Pressure (mm of Hg) Oxygen, dissolved (mg/L) pH, Field (Standard Units) pH, Lab (Standard Units) 15389000 4/9/04 14:00 1,020 233 <2.0 764 5.7 7.4 E7.7 15389000 6/2/04 16:20 65,000 91 140 743 10.7 7.6 7.6 15389000 6/7/04 15:20 53,500 92 76 752 9.4 7.7 E7.1 15389000 6/11/04 13:50 37,600 114 50 744 8.6 7.7 7.1 15389000 7/29/04 14:20 7,000 181 18 742 -- 8.2 8.1 15389000 8/9/04 16:10 21,700 159 24 756 9.5 7.7 7.7 15389000 9/9/04 13:00 5,510 194 <2.0 755 11.2 8.1 8.0 

Station ID Date/Time 

Specific 

Conductance, 

Lab (μS /cm) 

Specific 

Conductance, 

Fld (μS /cm) 

Air Temp 

(°C) 

Water Temp 

(°C) 

UV Absorbance 

254 NM, Flt 

(units/cm) 

UV Absorbance 

280 NM, Flt (units/cm)

Calcium 

(mg/L) 

Magnesium 

(mg/L) 

15389000 4/9/04 14:00 383 404 14.0 0.0 0.040 0.028 61.9 13.5 15389000 6/2/04 16:20 109 102 -- 10.0 0.551 0.414 17.1 2.69 15389000 6/7/04 15:20 126 131 -- 12.7 0.363 0.270 19.3 3.34 15389000 6/11/04 13:50 142 137 -- 13.0 0.366 0.271 21.4 3.95 15389000 7/29/04 14:20 301 289 -- 17.4 0.079 0.056 50.8 8.38 15389000 8/9/04 16:10 227 223 -- 15.1 0.209 0.154 30.1 7.77 15389000 9/9/04 13:00 284 287 -- 5.6 0.126 0.089 41.2 8.77 

8
Table 3. USGS National Water Quality Laboratory Analyses- Porcupine River near Fort Yukon, Alaska—Continued 

Station ID Date/Time Potassium (mg/L) Sodium (mg/L) Alkalinity, Dis fet lab, as CaCO3 (mg/L) Alkalinity, Dis tot IT Field (mg/L) Bicarbonate, Dis IT Field (mg/L) 

Station ID Date/Time Chloride (mg/L) Fluoride (mg/L) Silica (mg/L) Sulfate (mg/L) Nitrogen, Ammonia, dissolved (mg/L) Nitrogen, Ammonia + Organic, dissolved (mg/L) Nitrogen, Ammonia + Organic Total (mg/L)

15389000 4/9/04 14:00 5.15 <0.2 4.65 30.5 <0.010 E0.05 <0.10 15389000 6/2/04 16:20 0.62 <0.2 2.17 9.5 <0.010 0.40 0.82 

15389000 6/7/04 15:20 0.67 <0.2 2.56 13.1 <0.010 0.33 0.62 15389000 6/11/04 13:50 0.83 <0.2 2.82 16.7 <0.010 0.30 0.55 15389000 7/29/04 14:20 2.97 <0.2 2.51 35.6 E0.005 0.12 0.17 15389000 8/9/04 16:10 1.47 <0.2 3.31 49.9 E0.007 0.18 0.29 15389000 9/9/04 13:00 2.19 <0.2 2.68 47.9 <0.010 0.15 0.23 

Carbonate, Dis IT 

Field (mg/L) 

15389000 4/9/04 14:00 0.59 5.38 176 172 210 0.0 15389000 6/2/04 16:20 0.71 2.11 42 39 48 0.0 15389000 6/7/04 15:20 0.63 1.21 49 45 55 0.0 15389000 6/11/04 13:50 0.61 1.71 51 47 57 0.0 15389000 7/29/04 14:20 0.63 3.75 119 115 140 0.0 15389000 8/9/04 16:10 0.65 3.29 62 60 76 0.0 15389000 9/9/04 13:00 0.53 4.07 100 100 122 0.0 

Station ID Date/Time 

Nitrogen, NO + 2

NO3, dissolved 

(mg/L) 

Nitrogen, Nitrite 

dissolved 

 (mg/L) 

Nitrogen, 

particulate wat flt 

susp (mg/L) 

Phosphorus, 

dissolved (mg/L) 

Ortho-phosphorus 

(mg/L) 

Phosphorus, 

Total (mg/L) 

Carbon Inorg. + 

Organic Partic. 

Total (mg/L) 

15389000 4/9/04 14:00 0.217 <0.002 <0.02 E0.003 <0.006 E0.003 <0.1 15389000 6/2/04 16:20 0.025 0.003 0.28 0.017 E0.003 0.198 3.3 15389000 6/7/04 15:20 0.032 E0.001 0.32 0.012 <0.006 0.130 4.2 15389000 6/11/04 13:50 0.037 E0.001 0.19 0.009 <0.006 0.061 2.4 15389000 7/29/04 14:20 0.040 E0.001 0.04 E0.004 <0.006 0.006 0.4 15389000 8/9/04 16:10 0.075 E0.001 -- E0.003 <0.006 0.043 -- 15389000 9/9/04 13:00 E0.012 E0.001 <0.02 E0.002 <0.006 E0.003 0.2 

9
Table 3. USGS National Water Quality Laboratory Analyses- Porcupine River near Fort Yukon, Alaska—Continued 

Station ID Date/Time Carbon Inorganic, Partic. Total (mg/L) Carbon, Organic dissolved (mg/L) Carbon, Organic Particulate Total (mg/L) Aluminum (μg/L) Antimony (μg/L) Arsenic (μg/L) Station ID Date/Time Beryllium (μg/L) Boron (μg/L) Cadmium (μg/L) Chromium (μg/L) Cobalt (μg/L) Copper (μg/L) Iron (μg/L) Lead (μg/L) Lithium (μg/L) Manganese (μg/L) 

15389000 4/9/04 14:00 <0.06 8 <0.04 <0.8 0.179 0.7 9 E0.07 7.3 11.1 15389000 6/2/04 16:20 <0.06 E7 <0.04 <0.8 0.180 2.5 310 0.24 1.8 6.6 15389000 6/7/04 15:20 <0.06 <8 <0.04 <0.8 0.127 4.3 148 0.14 2.0 4.2 15389000 6/11/04 13:50 <0.06 E5 <0.04 <0.8 0.126 2.0 171 0.14 2.5 4.5 15389000 7/29/04 14:20 <0.06 8 <0.04 <0.8 0.160 1.4 E4 <0.08 5.6 0.5 15389000 8/9/04 16:10 <0.06 8 <0.04 <0.8 0.165 2.2 72 <0.08 5.3 4.6 15389000 9/9/04 13:00 <0.06 10 <0.04 <0.8 0.205 1.7 25 <0.08 7.5 4.4 

Barium 

(μg/L) 

15389000 4/9/04 14:00 <0.1 1.7 <0.1 E1 <0.20 0.3 94 15389000 6/2/04 16:20 0.7 16.3 2.6 34 E0.10 0.4 38 15389000 6/7/04 15:20 0.2 10.9 4.0 20 <0.20 0.4 37 15389000 6/11/04 13:50 0.2 13.1 2.2 26 <0.20 0.4 44 15389000 7/29/04 14:20 <0.1 3.1 0.4 12 <0.20 0.3 68 15389000 8/9/04 16:10 <0.1 5.8 1.1 20 <0.20 0.3 55 15389000 9/9/04 13:00 <0.1 4.4 0.2 12 <0.20 0.3 67 

Station ID Date/Time Molybdenum (μg/L) Nickel (μg/L) Selenium (μg/L) Silver (μg/L) Strontium (μg/L) Vanadium (μg/L) Zinc (μg/L) Uranium, natural (μg/L) Sediment, Susp. (Sieve diam. % < 0.062 mm) Sediment, Susp. (mg/L) 

15389000 4/9/04 14:00 1.2 1.57 0.5 <0.2 161 0.6 1.6 0.83 64 2 

15389000 6/2/04 16:20 E0.3 3.21 <0.4 <0.2 44.4 0.5 1.0 0.20 90 218 15389000 6/7/04 15:20 E0.3 2.34 <0.4 <0.2 54.6 0.4 E0.6 0.25 89 150 15389000 6/11/04 13:50 E0.3 2.15 E0.3 <0.2 64.1 0.4 1.1 0.25 93 90 15389000 7/29/04 14:20 0.7 1.80 0.4 <0.2 134 0.3 0.7 0.66 81 2 15389000 8/9/04 16:10 E0.4 2.28 E0.3 <0.2 130 0.6 1.6 0.26 97 39 15389000 9/9/04 13:00 0.5 1.86 <0.4 <0.2 144 0.2 1.5 0.46 90 1 

10
Table 4. USGS National Water Quality Laboratory Analyses- Yukon River near Stevens Village, Alaska 

[Station ID, station identification number, refer to Table 1 for description and Figure 1 for location; ft3/s, cubic feet per second; °C, degrees Celsius; mg/L, milligram per liter; NTU, Nephelometric 

turbidity unit; Hg; mercury, <; less then detection limit; --, missing value; mm, millimeter; lab, laboratory; fld, field; μS/cm, microsiemen per centimeter at 25 degrees Celsius; cm, centimeter; UV, 

Ultraviolet; NM, nanometer; Flt, filtered; NO2, nitrite; NO3, nitrate; wat flt susp., water filtered suspended; μg/L, microgram per liter; Dis fet lab, dissolved fixed end-point titration in laboratory; Dis tot 

IT, dissolved total incremental titration; Dis IT field, dissolved incremental titration in the field; %, percent; E, estimated; M, presence verified but not quantified; diam., diameter; Susp., Suspended] 

Station ID Date/Time Discharge (ft3/s) Solids, Residue at 180°C, Dissolved (mg/L) Turbidity Lab Hach (NTU) Barometric Pressure (mm of Hg) Oxygen, dissolved (mg/L) pH, Field (Standard Units) pH, Lab (Standard Units) 

15453500 4/1/04 19:00 20,600 185 2.6 775 8.2 7.7 7.9 15453500 6/4/04 15:20 424,000 121 220 759 9.5 8.1 8.0 15453500 6/9/04 14:30 394,000 113 150 756 8.7 8.0 7.6 15453500 6/23/04 13:00 265,000 135 120 756 9.2 7.9 8.0 15453500 7/13/04 14:50 189,000 141 500 759 9.4 7.9 E7.6 15453500 8/17/04 16:50 151,000 142 140 761 7.5 7.9 7.9 15453500 9/10/04 15:30 100,500 164 120 759 11.1 8.0 8.1 

Station ID Date/Time 

Specific 

Conductance, 

Lab (μS/cm) 

Specific 

Conductance Fld 

(μS/cm) 

Air Temp 

(°C) 

Water Temp 

(°C) 

UV Absorbance 254 

NM, Flt (units/cm)

UV Absorbance 280

NM, Flt (units/cm)

Calcium 

(mg/L) 

Magnesium 

(mg/L) 

15453500 4/1/04 19:00 278 284 -18.0 0.0 0.036 0.026 45.3 11.0 15453500 6/4/04 15:20 163 165 18.0 13.7 0.367 0.276 25.5 5.22 15453500 6/9/04 14:30 173 167 -- 15.3 0.276 0.206 25.1 5.54 15453500 6/23/04 13:00 209 206 24.0 20.0 0.136 0.099 30.2 7.19 15453500 7/13/04 14:50 215 229 -- 17.6 0.057 0.041 30.2 7.57 15453500 8/17/04 16:50 235 230 22.5 17.5 0.065 0.047 32.2 8.04 15453500 9/10/04 15:30 242 244 -- 8.1 0.060 0.043 34.8 8.45 

11
Table 4. USGS National Water Quality Laboratory Analyses- Yukon River near Stevens Village, Alaska—Continued 

Station ID Date/Time Potassium (mg/L) Sodium (mg/L) Alkalinity Wat. Dis fet lab CaCO3 (mg/L) Alkalinity, Dis tot IT Field (mg/L) Bicarbonate, Dis IT Field (mg/L) Carbonate, Dis IT Field (mg/L) 

15453500 4/1/04 19:00 1.16 3.39 116 108 132 0.0 15453500 6/4/04 15:20 0.98 1.59 64 61 74 0.0 15453500 6/9/04 14:30 0.92 1.62 65 61 74 0.0 15453500 6/23/04 13:00 1.03 2.08 77 72 88 0.0 15453500 7/13/04 14:50 1.68 2.72 83 69 84 0.0 15453500 8/17/04 16:50 1.51 2.97 84 82 100 0.0 15453500 9/10/04 15:30 1.36 3.21 91 95 116 0.0 

Station ID Date/Time Chloride (mg/L) Fluoride (mg/L) Silica (mg/L) Sulfate (mg/L) Nitrogen, Ammonia, dissolved (mg/L) Nitrogen, Ammonia + Organic, dissolved (mg/L) Nitrogen, Ammonia + Organic Total (mg/L) 

15453500 4/1/04 19:00 1.33 <0.2 7.36 35.1 <0.010 E0.06 E0.09 15453500 6/4/04 15:20 0.58 <0.2 4.41 19.0 <0.010 0.30 0.84 15453500 6/9/04 14:30 0.55 <0.2 4.73 20.7 <0.010 0.24 0.73 15453500 6/23/04 13:00 0.66 <0.2 5.94 29.1 <0.010 0.10 0.41 15453500 7/13/04 14:50 0.94 <0.2 5.68 32.8 E0.005 E0.07 0.43 15453500 8/17/04 16:50 0.68 <0.2 5.49 37.7 E0.005 E0.08 0.26 15453500 9/10/04 15:30 0.91 <0.2 5.67 37.9 0.010 E0.09 0.23 

12
Table 4. USGS National Water Quality Laboratory Analyses- Yukon River near Stevens Village, Alaska—Continued 

Station ID Date/Time 

Nitrogen, NO + 2

NO3, dissolved 

(mg/L) 

Nitrogen, 

Nitrite dissolved 

(mg/L) 

Nitrogen, 

particulate wat flt susp 

(mg/L) 

Phosphorus, 

dissolved 

(mg/L) 

Ortho-phosphorus 

(mg/L) 

Phosphorus, 

Total (mg/L) 

Carbon Inorg. + 

Organic Partic. 

Total (mg/L) 

15453500 4/1/04 19:00 0.084 <0.002 <0.02 E0.003 <0.006 0.007 0.1 15453500 6/4/04 15:20 0.033 0.002 0.51 0.008 <0.006 0.65 9.2 15453500 6/9/04 14:30 0.033 E0.001 0.29 0.005 <0.006 0.47 5.2 15453500 6/23/04 13:00 0.036 <0.002 0.15 0.004 <0.006 0.33 2.9 15453500 7/13/04 14:50 0.032 E0.001 0.28 <0.004 <0.006 0.50 13.9 15453500 8/17/04 16:50 0.037 <0.002 0.13 E0.003 <0.006 0.40 7.8 15453500 9/10/04 15:30 0.038 E0.001 0.07 <0.004 <0.006 0.20 2.1 

Station ID Date/Time Carbon Inorganic, Partic. Total (mg/L) Carbon, Organic dissolved (mg/L) Carbon, Organic Particulate Total (mg/L) Aluminum (μg/L) Antimony (μg/L) Arsenic (μg/L) Barium (μg/L) 

15453500 4/1/04 19:00 <0.1 1.8 0.1 2 E0.13 0.4 68 15453500 6/4/04 15:20 2.2 10.4 7.0 29 E0.16 0.6 39 15453500 6/9/04 14:30 1.0 9.1 4.3 26 E0.18 0.6 42 15453500 6/23/04 13:00 <0.1 4.6 2.8 21 0.20 0.7 51 15453500 7/13/04 14:50 7.7 2.4 6.3 24 0.27 0.7 49 15453500 8/17/04 16:50 6.1 1.2 1.7 25 0.24 0.6 47 15453500 9/10/04 15:30 0.7 2.2 1.4 13 E0.17 0.6 47 

Station ID Date/Time Beryllium (μg/L) Boron (μg/L) Cadmium (μg/L) Chromium (μg/L) Cobalt (μg/L) Copper (μg/L) Iron (μg/L) Lead (μg/L) Lithium (μg/L) Manganese (μg/L) 

15453500 4/1/04 19:00 <0.06 15 <0.04 <0.8 0.123 0.8 16 <0.08 3.3 20.4 15453500 6/4/04 15:20 <0.06 E4 E0.02 <0.8 0.154 3.6 107 0.10 2.1 4.2 15453500 6/9/04 14:30 <0.06 E5 <0.04 <0.8 0.112 2.8 60 0.08 2.0 3.8 15453500 6/23/04 13:00 <0.06 E6 <0.04 <0.8 0.131 2.0 16 <0.08 2.6 3.5 15453500 7/13/04 14:50 <0.06 10 <0.04 <0.8 0.111 1.4 <6 <0.08 3.0 3.2 15453500 8/17/04 16:50 <0.06 14 <0.04 <0.8 0.093 1.5 7 <0.08 3.8 1.8 15453500 9/10/04 15:30 <0.06 15 <0.04 <0.8 0.150 2.7 E6 <0.08 5.2 8.0 

13
Table 4. USGS National Water Quality Laboratory Analyses- Yukon River near Stevens Village, Alaska—Continued 

Station ID Date/Time Molybdenum (μg/L) Nickel (μg/L) Selenium (μg/L) Silver (μg/L) Strontium (μg/L) Vanadium (μg/L) Zinc (μg/L) Uranium, natural (μg/L) Sediment, Susp. (Sieve diam. % <0.062 mm) Sediment, Susp. (mg/L) 

15453500 4/1/04 19:00 1.5 1.06 0.6 <0.2 178 0.4 0.8 1.15 87 4 15453500 6/4/04 15:20 0.7 2.53 E0.3 <0.2 85.8 0.7 1.0 0.62 80 612 15453500 6/9/04 14:30 0.7 1.86 0.4 <0.2 94.7 0.5 E0.5 0.62 74 415 15453500 6/23/04 13:00 1.0 1.54 0.6 <0.2 109 0.7 E0.5 0.82 72 351 15453500 7/13/04 14:50 1.5 1.07 0.7 <0.2 138 0.7 <0.6 0.97 89 664 15453500 8/17/04 16:50 1.5 1.07 0.5 <0.2 144 0.9 0.7 0.93 88 460 15453500 9/10/04 15:30 1.5 1.11 0.6 <0.2 157 0.6 1.1 0.91 74 236 

14
Table 5. USGS National Water Quality Laboratory Analyses- Tanana River at Nenana, Alaska 

[Station ID, station identification number, refer to Table 1 for description and Figure 1 for location; ft3/s, cubic feet per second; °C, degrees Celsius; mg/L, milligram per liter; NTU, Nephelometric 

turbidity unit; Hg; mercury, <; less then detection limit; --, missing value; mm, millimeter; lab, laboratory; fld, field; μS/cm, microsiemen per centimeter at 25 degrees Celsius; cm, centimeter; UV, 

Ultraviolet; NM, nanometer; Flt, filtered; NO2, nitrite; NO3, nitrate; wat flt susp., water filtered suspended; μg/L, microgram per liter; Dis fet lab, dissolved fixed end-point titration in laboratory; Dis tot 

IT, dissolved total incremental titration; Dis IT field, dissolved incremental titration in the field; %, percent; E, estimated; M, presence verified but not quantified; diam., diameter; Susp., Suspended] 

Station ID Date/Time Discharge (ft3/s) Solids, Residue at 180°C, Dissolved (mg/L) Turbidity Lab Hach (NTU) Barometric Pressure (mm of Hg) Oxygen, dissolved (mg/L) pH, Field (Standard Units) pH, Lab (Standard Units) 

15515500 3/30/04 17:50 6,560 204 4.4 756 10.1 7.9 E7.1 15515500 5/28/04 12:00 52,500 125 340 745 10.2 7.8 7.7 15515500 6/10/04 13:10 50,900 124 450 751 9.4 7.9 7.5 15515500 6/25/04 16:35 58,800 136 1,300 758 9.0 7.9 -- 15515500 7/23/04 16:10 66,200 123 1,200 754 9.8 7.9 E7.2 15515500 8/26/04 15:30 55,400 134 1,100 753 8.4 7.8 7.7 15515500 9/22/04 16:00 18,800 190 68 -- 11.8 7.8 8.0 

Station ID Date/Time 

Specific 

Conductance, 

Lab (μS/cm) 

Specific 

Conductance, 

Fld (μS/cm) 

Air Temp. 

(oC) 

Water Temp. 

(oC) 

UV Absorbance 

254 NM, Flt (units/cm)

UV Absorbance 

280 NM, Flt 

(units/cm) 

Calcium 

(mg/L) 

Magnesium 

(mg/L) 

15515500 3/30/04 17:50 312 313 -6.5 0.0 0.024 0.018 48.5 10.1 15515500 5/28/04 12:00 211 198 -- 12.8 0.191 0.143 29.1 6.70 15515500 6/10/04 13:10 236 238 -- 14.6 0.075 0.055 31.9 7.38 15515500 6/25/04 16:35 -- 214 28.5 20.2 0.031 0.022 31.1 8.26 15515500 7/23/04 16:10 223 209 -- 14.9 0.016 0.012 32.1 6.33 15515500 8/26/04 15:30 242 236 12.0 10.7 0.015 0.011 22.5 5.35 15515500 9/22/04 16:00 289 284 -- 4.3 0.039 0.028 42.9 9.47 

15
Table 5. USGS National Water Quality Laboratory Analyses- Tanana River at Nenana, Alaska—Continued 

Station ID Date/Time Potassium (mg/L) Sodium (mg/L) Alkalinity, Dis fet lab, as CaCO3 (mg/L) Alkalinity, Dis tot IT Field (mg/L) Bicarbonate, Dis IT Field (mg/L) Carbonate, Dis IT Field (mg/L) 

15515500 3/30/04 17:50 2.36 4.70 130 124 151 0.0 15515500 5/28/04 12:00 1.90 3.33 71 74 96 0.0 15515500 6/10/04 13:10 2.03 3.79 80 76 92 0.0 15515500 6/25/04 16:35 2.80 3.67 -- 83 101 0.0 15515500 7/23/04 16:10 2.18 3.28 72 67 82 0.0 15515500 8/26/04 15:30 1.44 2.77 74 72 87 0.0 15515500 9/22/04 16:00 1.90 5.05 111 113 137 0.0 

Station ID Date/Time Chloride (mg/L) Fluoride (mg/L) Silica (mg/L) Sulfate (mg/L) Nitrogen, Ammonia dissolved (mg/L) Nitrogen, Ammonia + Organic, dissolved (mg/L) Nitrogen, Ammonia + Organic Total (mg/L) 

15515500 3/30/04 17:50 1.35 <0.2 15.8 35.3 0.049 0.11 0.11 15515500 5/28/04 12:00 1.93 <0.2 7.51 32.5 <0.010 0.17 0.61 15515500 6/10/04 13:10 2.18 <0.2 7.80 36.6 <0.010 E0.08 0.49 15515500 6/25/04 16:35 1.60 <0.17 6.46 37.4 <0.010 <0.10 0.89 15515500 7/23/04 16:10 1.48 <0.2 6.33 37.2 <0.010 <0.10 0.66 15515500 8/26/04 15:30 1.28 <0.2 4.56 42.5 E0.007 <0.10 0.56 15515500 9/22/04 16:00 1.60 <0.2 11.7 41.7 0.028 E0.07 0.21 

16
Table 5. USGS National Water Quality Laboratory Analyses- Tanana River at Nenana, Alaska—Continued 

Station ID Date/Time Carbon Inorganic, Partic. Total (mg/L) Carbon, Organic dissolved (mg/L) Carbon, Organic Particulate Total (mg/L) Aluminum (μg/L) Antimony (μg/L) Arsenic (μg/L) Station ID Date/Time 

Nitrogen, NO + 2

NO3, dissolved 

(mg/L) 

Nitrogen, 

Nitrite dissolved 

(mg/L) 

Nitrogen, 

particulate wat flt 

susp (mg/L) 

Phosphorus, 

dissolved 

(mg/L) 

Orthophosphorus 

(mg/L) 

Phosphorus, 

Total (mg/L) 

Carbon Inorg. + 

Organic Partic. 

Total (mg/L) 

15515500 3/30/04 17:50 0.182 0.002 <0.02 E0.003 <0.006 0.023 0.3 15515500 5/28/04 12:00 0.099 0.002 0.35 0.006 E0.004 0.77 5.9 15515500 6/10/04 13:10 0.090 0.002 0.31 E0.003 <0.006 1.31 6.3 15515500 6/25/04 16:35 0.067 E0.001 E0.48 <0.004 <0.006 1.19 E9.9 15515500 7/23/04 16:10 0.062 <0.002 0.33 E0.003 <0.006 0.39 5.8 15515500 8/26/04 15:30 0.064 0.002 0.11 <0.004 <0.006 0.53 1.3 15515500 9/22/04 16:00 0.123 E0.001 0.10 E0.004 <0.006 0.22 1.9 

Barium 

(μg/L) 

15515500 3/30/04 17:50 <0.1 1.4 0.3 M E0.13 0.6 51 15515500 5/28/04 12:00 0.9 5.9 5.0 21 0.28 1.0 31 15515500 6/10/04 13:10 2.0 2.7 4.4 20 0.31 1.0 36 15515500 6/25/04 16:35 E3.3 1.2 E6.6 27 M 1.1 36 15515500 7/23/04 16:10 1.2 0.7 4.6 19 0.36 0.8 30 15515500 8/26/04 15:30 0.2 0.8 1.1 15 0.25 0.5 21 15515500 9/22/04 16:00 0.2 1.6 1.7 7 0.20 1.0 40 

17
Table 5. USGS National Water Quality Laboratory Analyses- Tanana River at Nenana, Alaska—Continued 

Station ID Date/Time Beryllium (μg/L) Boron (μg/L) Cadmium (μg/L) Chromium (μg/L) Cobalt (μg/L) Copper (μg/L) Iron (μg/L) Lead (μg/L) Lithium (μg/L) Manganese (μg/L) 

15515500 3/30/04 17:50 <0.06 27 <0.04 <0.8 0.272 1.0 11 <0.08 3.4 105 15515500 5/28/04 12:00 <0.06 23 E0.02 <0.8 0.158 4.8 44 <0.08 3.9 9.8 15515500 6/10/04 13:10 <0.06 22 <0.04 <0.8 0.125 1.8 10 <0.08 4.8 6.3 15515500 6/25/04 16:35 <0.06 30 <0.04 <0.8 M M <6.4 M M M 15515500 7/23/04 16:10 <0.06 19 <0.04 <0.8 0.130 0.8 <6.0 <0.08 4.5 2.4 15515500 8/26/04 15:30 <0.06 16 E0.02 <0.8 0.170 1.7 <6.0 E0.06 3.2 10.9 15515500 9/22/04 16:00 <0.06 29 E0.02 <0.8 0.233 1.1 21 <0.08 4.2 53.4 

Station ID Date/Time Molybdenum (μg/L) Nickel (μg/L) Selenium (μg/L) Silver (μg/L) Strontium (μg/L) Vanadium (μg/L) Zinc (μg/L) Uranium, natural (μg/L) Sediment, Susp. (Sieve diam. % <0.062 mm) Sediment, Susp. (mg/L) 

15515500 3/30/04 17:50 1.3 1.49 0.9 <0.2 202 1.9 2.4 0.89 74 16 15515500 5/28/04 12:00 0.9 1.69 E0.4 <0.2 123 0.7 0.8 0.75 53 1,300 15515500 6/10/04 13:10 1.0 0.96 0.5 <0.2 146 0.5 E0.3 0.93 55 1,270 15515500 6/25/04 16:35 2.0 M M <0.2 140 0.6 -- 1.0 82 2,990 15515500 7/23/04 16:10 1.2 1.41 0.5 <0.2 127 0.6 <0.6 0.71 78 2,630 15515500 8/26/04 15:30 0.9 1.48 0.5 <0.2 85.8 0.4 3.5 0.61 75 2,610 15515500 9/22/04 16:00 1.3 1.19 0.6 <0.2 181 1.0 0.7 0.83 59 399 

18
Table 6. USGS National Water Quality Laboratory Analyses- Yukon River at Pilot Station, Alaska 

[Station ID, station identification number, refer to Table 1 for description and Figure 1 for location; ft3/s, cubic feet per second; °C, degree Celsius; mg/L, milligram per liter; NTU, Nephelometric 

turbidity unit; Hg; mercury, <; less then detection limit; --, missing value; mm, millimeter; lab, laboratory; fld, field; μS/cm, microsiemen per centimeter at 25 degrees Celsius; cm, centimeter; C, 

Celsius; UV, Ultraviolet; NM, nanometer; Flt, filtered; NO2, nitrite; NO3, nitrate; wat flt susp., water filtered suspended; μg/L, microgram per liter; Dis fet lab, dissolved fixed end-point titration in 

laboratory; Dis tot IT, dissolved total incremental titration; Dis IT field, dissolved incremental titration in the field; %, percent; E, estimated; M, presence verified but not quantified; diam., diameter; 

Susp., Suspended] 

Station ID Date/Time Discharge (ft3/s) Solids, Residue at 180°C, Dissolved (mg/L) Turbidity Lab Hach (NTU) Barometric Pressure (mm of Hg) Oxygen, dissolved (mg/L) pH, Field (Standard Units) pH, Lab (Standard Units) 

15565447 4/7/04 10:20 46,300 197 5.9 745 2.5 7.0 E7.4 15565447 5/26/04 16:20 521,000 115 150 -- -- 7.8 E6.9 15565447 6/15/04 15:20 639,000 118 140 767 7.3 7.5 7.8 15565447 6/29/04 16:40 512,000 120 170 764 8.6 7.9 7.7 15565447 7/20/04 10:30 330,000 E145 450 761 8.5 7.7 8.0 15565447 8/18/04 11:10 330,000 155 350 -- -- 7.8 7.6 15565447 9/22/04 13:00 218,000 E153 190 748 10.8 8.0 8.0 

Station ID Date/Time 

Specific 

Conductance, 

Lab (μS/cm) 

Specific 

Conductance, 

Fld (μS/cm) 

Air Temp 

(°C) 

Water Temp 

(°C) 

UV Absorbance 

254 NM, Flt (units/cm)

UV Absorbance 280 

NM, Flt (units/cm)

Calcium 

(mg/L) 

Magnesium 

(mg/L) 

15565447 4/7/04 10:20 305 323 3.5 0.0 0.059 0.043 48.7 11.5 15565447 5/26/04 16:20 143 147 13.5 9.0 0.548 0.413 22.8 4.43 15565447 6/15/04 15:20 165 163 -- 16.5 0.320 0.238 26.9 4.89 15565447 6/29/04 16:40 192 197 -- 19.0 0.222 0.164 28.0 5.69 15565447 7/20/04 10:30 209 220 24.5 19.5 0.094 0.068 32.8 7.34 15565447 8/18/04 11:10 228 238 25.0 18.0 0.086 0.062 34.5 7.69 15565447 9/22/04 13:00 258 264 5.5 7.5 0.090 0.066 38.2 9.72 

19
Table 6. USGS National Water Quality Laboratory Analyses- Yukon River at Pilot Station, Alaska—Continued 

Station ID Date/Time Chloride (mg/L) Fluoride (mg/L) Silica (mg/L) Sulfate (mg/L) Nitrogen, Ammonia, dissolved (mg/L) Nitrogen, Ammonia + Organic, dissolved (mg/L) Nitrogen, Ammonia + Organic Total (mg/L) 

15565447 4/7/04 10:20 1.32 <0.2 12.8 27.5 0.100 0.20 0.22 15565447 5/26/04 16:20 0.80 <0.2 4.96 13.4 <0.010 0.42 0.69 15565447 6/15/04 15:20 0.75 <0.2 5.19 17.9 E0.005 0.27 0.71 15565447 6/29/04 16:40 0.81 <0.2 6.36 23.7 <0.010 0.17 0.79 15565447 7/20/04 10:30 1.12 <0.2 6.84 29.9 E0.006 E0.10 E0.41 15565447 8/18/04 11:10 1.28 <0.2 6.26 36.0 <0.010 E0.08 0.41 15565447 9/22/04 13:00 1.13 <0.2 7.48 36.7 E0.014 E0.12 E0.32 

Station ID Date/Time Potassium (mg/L) Sodium (mg/L) Alkalinity, Dis fet lab, as CaCO3 (mg/L) Alkalinity, Dis tot IT Field (mg/L) Bicarbonate, Dis IT Field (mg/L) Carbonate, Dis IT Field (mg/L) 

15565447 4/7/04 10:20 1.52 3.95 143 134 163 0.0 15565447 5/26/04 16:20 0.96 1.83 58 52 63 0.0 15565447 6/15/04 15:20 1.08 1.77 68 63 77 0.0 15565447 6/29/04 16:40 1.15 2.25 73 68 83 0.0 15565447 7/20/04 10:30 1.90 3.07 83 76 95 0.0 15565447 8/18/04 11:10 1.76 3.13 86 77 94 0.0 15565447 9/22/04 13:00 1.68 3.82 98 94 114 0.0 

Station ID Date/Time 

Nitrogen, NO + 2

NO3, dissolved 

(mg/L) 

Nitrogen, 

Nitrite dissolved 

(mg/L) 

Nitrogen, 

particulate wat flt 

susp (mg/L) 

Phosphorus, 

dissolved (mg/L)

Orthophosphorus 

(mg/L) 

Phosphorus, 

Total (mg/L) 

Carbon Inorg. + 

Organic Partic. 

Total (mg/L) 

15565447 4/7/04 10:20 0.188 0.002 0.05 E0.002 <0.006 0.024 0.6 15565447 5/26/04 16:20 0.084 0.002 0.34 0.014 <0.006 0.34 5.5 15565447 6/15/04 15:20 0.054 E0.001 0.26 0.010 <0.006 0.50 4.4 15565447 6/29/04 16:40 0.069 E0.001 0.30 0.007 E0.003 0.31 4.8 15565447 7/20/04 10:30 0.082 E0.001 E0.30 E0.005 E0.003 E0.43 E8.8 15565447 8/18/04 11:10 0.082 E0.001 0.25 0.004 <0.006 0.24 9.0 15565447 9/22/04 13:00 0.108 E0.001 E0.22 E0.005 E0.003 E0.18 E4.8 

20
Table 6. USGS National Water Quality Laboratory Analyses- Yukon River at Pilot Station, Alaska—Continued 

Station ID Date/Time Carbon Inorganic, Partic. Total (mg/L) Carbon, Organic dissolved (mg/L) Carbon, Organic Particulate Total (mg/L) Aluminum (μg/L) Antimony (μg/L) Arsenic (μg/L) Barium (μg/L) 

15565447 4/7/04 10:20 <0.1 2.2 0.6 M <0.20 0.4 80 15565447 5/26/04 16:20 0.3 13.9 5.2 27 E0.17 0.8 37 15565447 6/15/04 15:20 0.3 9.1 4.1 15 0.26 1.0 41 15565447 6/29/04 16:40 0.3 6.2 4.5 14 0.25 0.9 42 15565447 7/20/04 10:30 E4.4 E3.1 E4.3 17 0.34 0.9 49 15565447 8/18/04 11:10 5.4 2.6 3.7 15 0.30 0.9 51 15565447 9/22/04 13:00 E0.7 E2.7 E4.1 7 0.27 0.8 54 

Station ID Date/Time Beryllium (μg/L) Boron (μg/L) Cadmium (μg/L) Chromium (μg/L) Cobalt (μg/L) Copper (μg/L) Iron (μg/L) Lead (μg/L) Lithium (μg/L) Manganese (μg/L) 

15565447 4/7/04 10:20 <0.06 10 E0.04 <0.8 0.317 1.2 91 <0.08 3.1 143 15565447 5/26/04 16:20 <0.06 E5 <0.04 <0.8 0.156 5.4 306 0.20 1.8 16.4 15565447 6/15/04 15:20 <0.06 E6 <0.04 <0.8 0.143 3.6 123 0.11 1.9 14.3 15565447 6/29/04 16:40 <0.06 E8 <0.04 <0.8 0.129 2.9 141 0.09 2.2 5.4 15565447 7/20/04 10:30 <0.06 13 <0.04 <0.8 0.119 1.8 14 <0.08 3.4 0.5 15565447 8/18/04 11:10 <0.06 14 <0.04 <0.8 0.108 1.9 25 <0.08 3.3 1.9 15565447 9/22/04 13:00 <0.06 18 <0.04 <0.8 0.140 1.3 64 <0.08 3.7 15.3 

Station ID Date/Time Molybdenum (μg/L) Nickel (μg/L) Selenium (μg/L) Silver (μg/L) Strontium (μg/L) Vanadium (μg/L) Zinc (μg/L) Uranium, natural (μg/L) Sediment, Susp. (Sieve diam. % < 0.062 mm) Sediment, Susp. (mg/L) 

15565447 4/7/04 10:20 0.8 2.70 E0.3 <0.2 200 0.6 3.0 0.85 97 5 15565447 5/26/04 16:20 0.5 2.31 E0.2 <0.2 88.6 0.7 2.3 0.52 75 339 15565447 6/15/04 15:20 0.7 1.57 E0.3 <0.2 93.6 0.8 E0.5 0.51 68 514 15565447 6/29/04 16:40 0.9 1.45 E0.4 <0.2 95.0 0.7 2.0 0.64 84 299 15565447 7/20/04 10:30 1.5 1.04 0.7 <0.2 132 0.8 <0.6 0.94 -- -- 15565447 8/18/04 11:10 1.4 0.86 E0.4 <0.2 139 0.9 E0.4 0.89 96 499 15565447 9/22/04 13:00 1.3 0.94 0.4 <0.2 161 0.8 <0.6 0.99 -- -- 

21
CHAPTER 3 - Dissolved Organic Carbon (DOC) Characterization 

by George R. Aiken 

A description of sample collection and processing of samples for DOC, ultraviolet (UV) 

absorbance spectroscopy, specific UV absorbance (SUVA), and DOC fractionation analyses is 

given in Schuster (2003). These analyses were performed at the USGS National Research Program 

Laboratories in Boulder, Colorado. Sample analysis results for WY 2004 are given in table 7. 

22
Table 7. Dissolved organic carbon concentrations and fractionation analyses from fixedstation sampling sites in the Yukon River Basin

[Station ID, station identification number, refer to table 1 for description and figure 1 for location; DOC, dissolved organic carbon; mg 

C/L, milligrams carbon per liter; UV (abs @ 254 nm), Ultraviolet absorbance at the 254 nanometer wavelength; SUVA, Specific UV 

absorbance; L/mg C*m), liters per milligram carbon multiplied by a one-meter path length; %, percent; --, missing value; all samples 

filtered with 0.45- μm glass-fiber filters prior to analyses] 

Station ID Date DOC 

 (mg C/L) 

 UV 

(abs @ 

254nm) 

SUVA 

[L/(mg 

C*m)] 

Hydrophobic Acid 

SUVA [L/(mg C*m)] 

Hydrophobic Acid 

(%) 

15356000 4/13/2004 1.7 0.031 1.8 4.0 62 

15356000 5/26/2004 9.8 0.350 3.6 4.0 56 

15356000 6/30/2004 2.1 0.047 2.3 3.1 39 

15356000 7/20/2004 1.7 0.029 1.7 2.7 43 

15356000 8/19/2004 1.8 0.035 2.0 3.0 43 

15389000 4/9/2004 1.9 0.043 2.2 3.1 42 

15389000 6/2/2004 15.9 0.544 3.4 4.1 52 

15389000 6/7/2004 10.7 0.357 3.3 3.9 54 

15389000 6/11/2004 10.9 0.364 3.3 3.9 53 

15389000 7/29/2004 3.7 0.086 2.3 3.1 43 

1538900 8/9/2004 6.3 0.206 3.3 3.8 55 

15389000 9/9/2004 4.9 0.127 2.6 3.2 46 

15453500 4/1/2004 1.8 0.037 2.1 2.6 45 

15453500 6/4/2004 10.6 0.366 3.5 4.0 55 

15453500 6/9/2004 8.3 0.274 3.3 4.1 51 

15453500 6/23/2004 4.4 0.136 3.1 3.7 50 

15453500 7/13/2004 2.3 0.058 2.5 3.2 41 

15453500 8/17/2004 2.6 0.067 2.6 3.3 42 

15453500 9/9/2004 2.5 0.062 2.4 3.3 44 

15515500 3/30/2004 1.5 0.024 1.6 2.5 37 

15515500 5/28/2004 5.7 0.189 3.3 4.0 53 

15515500 6/10/2004 2.7 0.072 2.7 3.5 46 

15515500 6/25/2004 1.2 0.028 2.4 3.2 37 

15515500 7/23/2004 1.0 0.018 1.8 2.8 32 

15515500 8/26/2004 1.0 0.018 1.8 3.7 30 

15515500 9/22/2004 1.9 0.040 2.2 5.2 48 

15565447 4/7/2004 2.5 0.056 2.3 2.8 45 

15565447 5/26/2004 15.0 0.545 3.6 4.0 58 

15565447 6/15/2004 9.4 0.319 3.4 4.3 47 

15565447 6/29/2004 6.3 0.217 3.5 4.0 51 

15565447 7/20/2004 3.3 0.088 2.7 3.8 43 

15565447 8/18/2004 3.1 0.086 2.8 3.5 46 

15565447 9/22/2004 3.1 0.084 2.7 2.3 52 

23
Table 7. Dissolved organic carbon concentrations and fractionation analyses from fixedstation sampling sites in the Yukon River Basin—Continued

Station ID Date 

Hydrophilic 

organic 

matterSUVA 

[L/{mg C*m)] 

Hydrophilic 

organic matter (%) 

Transphylic Acids 

SUVA [L/(mg C*m)] 

Transphylic 

Acids (%) 

15356000 4/13/2004 -- -- -- -- 

15356000 5/26/2004 2.2 16 2.8 14 

15356000 6/30/2004 1.1 28 1.9 21 

15356000 7/20/2004 -- -- -- -- 

15356000 8/19/2004 -- -- -- -- 

15389000 4/9/2004 1.1 28 2.1 18 

15389000 6/2/2004 1.7 21 2.8 16 

15389000 6/7/2004 1.8 16 2.6 14 

15389000 6/11/2004 1.9 18 2.9 16 

15389000 7/29/2004 1.4 19 2.3 19 

15389000 8/9/2004 1.7 19 2.8 15 

15389000 9/9/2004 1.6 19 2.1 18 

15453500 4/1/2004 -- -- -- -- 

15453500 6/4/2004 1.8 18 2.8 14 

15453500 6/9/2004 2.9 16 2.7 17 

15453500 6/23/2004 1.9 17 2.7 19 

15453500 7/13/2004 1.6 28 2.5 22 

15453500 8/17/2004 1.4 27 2.2 16 

15453500 9/9/2004 1.5 21 2.1 18 

15515500 3/30/2004 -- -- -- -- 

15515500 5/28/2004 2.1 16 2.6 16 

15515500 6/10/2004 1.3 23 2.7 20 

15515500 6/25/2004 1.4 31 2.2 22 

15515500 7/23/2004 1.1 28 2.0 22 

15515500 8/26/2004 -- -- -- -- 

15515500 9/22/2004 -- -- -- -- 

15565447 4/7/2004 1.9 24 1.9 20 

15565447 5/26/2004 1.8 16 2.7 16 

15565447 6/15/2004 2.1 14 3.0 17 

15565447 6/29/2004 2.4 16 2.8 17 

15565447 7/20/2004 1.5 18 2.5 21 

15565447 8/18/2004 -- 21 2.5 15 

15565447 9/22/2004 3.0 19 2.3 18 

24
25

CHAPTER 4 - Dissolved Major Cations and Trace Elements 

by Howard E. Taylor, David A. Roth, and Ronald C. Antweiler 

References for the description of sample collection and processing of samples for 

various water-quality constituents are given in Chapter 2 of Schuster (2003). A 

description of sample analysis for major cations and trace elements at the USGS National 

Research Program Laboratories in Boulder, Colorado, is given in Chapter 4 of Schuster 

(2003). Sample analysis results for WY 2004 are given in table 8.
Table 8. Selected dissolved major cations and trace elements from fixed-station sampling sites in the Yukon River Basin 

[See Schuster (2003) for qualification of the accuracy of these data; Station ID, station identification number, refer to table 1 for description and figure 1 for location; Rep, field replicate; μg/L, 

microgram per liter; mg/L, milligram per liter; A, average of triplicate analysis; SD, standard deviation of triplicate analysis; <, less than; ±, plus or minus] 

Station ID Date Aluminum Arsenic Boron Barium Beryllium Bismuth Calcium

μg/L μg/L μg/L μg/L μg/L μg/L mg/L

A SD A SD A SD A SDD A SD A SD A SD 

15356000 04/13/04 1.7 ± 0.1 0.32 ± 0.01 7.7 ± 0.7 48 ± 1 < 0.03 ± 0.01 < 0.015 ± 0.001 33 ± 2 15356000 06/17/04 62 ± 1 0.54 ± 0.01 10 ± 1 41 ± 0 < 0.03 ± 0.01 0.003 ± 0.001 27 ± 0 

15356000 06/30/04 26 ± 2 0.60 ± 0.01 10 ± 1 40 ± 0 < 0.03 ± 0.01 0.002 ± 0.000 25 ± 0 

15356000 07/20/04 23 ± 0 0.56 ± 0.02 15 ± 1 40 ± 1 < 0.03 ± 0.01 < 0.001 ± 0.001 29 ± 1 

15356000 08/19/04 23 ± 1 0.57 ± 0.04 14 ± 1 39 ± 0 < 0.01 ± 0.00 0.004 ± 0.005 28 ± 0 

15356000 09/06/04 65 ± 5 0.51 ± 0.01 14 ± 1 40 ± 2 < 0.03 ± 0.01 0.002 ± 0.001 29 ± 1 

15389000 04/09/04 1.4 ± 0.1 0.20 ± 0.02 8.5 ± 0.7 89 ± 0 < 0.03 ± 0.01 0.003 ± 0.002 58 ± 0 

15389000 06/02/04 33 ± 2 0.41 ± 0.01 4.9 ± 0.4 38 ± 2 < 0.03 ± 0.01 0.010 ± 0.001 17 ± 1 

15389000 06/07/04 20 ± 1 0.38 ± 0.02 4.5 ± 0.1 37 ± 1 < 0.03 ± 0.01 0.015 ± 0.011 19 ± 1 

15389000 06/11/04 24 ± 1 0.38 ± 0.01 6.2 ± 1.0 42 ± 1 < 0.03 ± 0.01 0.008 ± 0.002 21 ± 0 

15389000 07/29/04 14 ± 1 0.35 ± 0.00 8.6 ± 0.9 70 ± 1 < 0.03 ± 0.02 < 0.001 ± 0.001 44 ± 1 

15389000 08/09/04 23 ± 1 0.28 ± 0.01 8.7 ± 0.3 52 ± 0 < 0.03 ± 0.01 0.001 ± 0.001 29 ± 1 

15389000 09/09/04 12 ± 0 0.26 ± 0.01 10 ± 1 65 ± 5 0.02 ± 0.01 0.003 ± 0.001 41 ± 1 

15453500 04/01/04 1.5 ± 0.0 0.32 ± 0.02 7.8 ± 0.6 63 ± 1 < 0.03 ± 0.02 < 0.001 ± 0.001 40 ± 2 

15453500 06/04/04 32 ± 0 0.58 ± 0.01 4.5 ± 0.5 39 ± 1 < 0.03 ± 0.01 0.010 ± 0.001 22 ± 0 

15453500 06/09/04 26 ± 0 0.56 ± 0.01 4.8 ± 0.5 41 ± 1 < 0.03 ± 0.01 0.005 ± 0.001 24 ± 2 

15453500 06/23/04 23 ± 1 0.62 ± 0.00 6.5 ± 0.6 47 ± 1 < 0.03 ± 0.02 0.003 ± 0.001 27 ± 1 

15453500 07/13/04 23 ± 1 0.68 ± 0.01 12 ± 1 49 ± 1 < 0.03 ± 0.01 < 0.001 ± 0.001 31 ± 2 

15453500 08/17/04 23 ± 1 0.61 ± 0.00 13 ± 2 47 ± 1 < 0.03 ± 0.01 < 0.001 ± 0.000 33 ± 0 

15453500 09/10/04 13 ± 1 0.54 ± 0.02 16 ± 0 47 ± 0 < 0.01 ± 0.00 < 0.003 ± 0.002 35 ± 0 

26
Table 8. Selected dissolved major cations and trace elements from fixed-station sampling sites in the Yukon River Basin—Continued 

Station ID Date Aluminum Arsenic Boron Barium Beryllium Bismuth Calcium 

μg/L μg/L μg/L μg/L μg/L μg/L mg/L

A SD A SD A SD A SD A SD A SD A SD 

15515500 03/30/04 0.91 ± 0.11 0.50 ± 0.01 21 ± 0 47 ± 0 < 0.03 ± 0.01 0.002 ± 0.002 47 ± 0 15515500 05/28/04 24 ± 2 1.0 ± 0.0 21 ± 2 32 ± 1 < 0.03 ± 0.01 0.005 ± 0.003 29 ± 1 

15515500 06/10/04 19 ± 0 0.96 ± 0.04 24 ± 0 35 ± 1 < 0.03 ± 0.01 0.005 ± 0.001 33 ± 1 

15515500 06/25/04 28 ± 2 1.0 ± 0.0 23 ± 0 37 ± 1 < 0.03 ± 0.01 0.002 ± 0.001 30 ± 1 15515500 07/23/04 20 ± 0 0.80 ± 0.03 17 ± 0 31 ± 1 < 0.03 ± 0.02 < 0.001 ± 0.001 28 ± 2 

15515500 08/26/04 16 ± 1 0.74 ± 0.01 20 ± 1 27 ± 0 < 0.01 ± 0.00 < 0.003 ± 0.003 31 ± 1 

15515500 09/22/04 7.4 ± 0.5 0.87 ± 0.01 25 ± 2 36 ± 1 < 0.01 ± 0.00 0.011 ± 0.006 41 ± 0 15565447 04/07/04 1.4 ± 0.8 0.40 ± 0.02 10 ± 0 78 ± 2 < 0.03 ± 0.01 0.002 ± 0.002 48 ± 1 

15565447 04/16/04 1.6 ± 0.1 0.39 ± 0.02 15 ± 1 74 ± 2 < 0.03 ± 0.01 < 0.001 ± 0.002 43 ± 1 

15565447 04/23/04 1.7 ± 0.1 0.40 ± 0.02 15 ± 1 71 ± 2 < 0.03 ± 0.01 < 0.001 ± 0.000 43 ± 2 

15565447 04/23/04 2.1 ± 0.2 0.37 ± 0.01 10 ± 1 65 ± 0 < 0.03 ± 0.01 < 0.001 ± 0.000 36 ± 1 

15565447 04/23/04 2.4 ± 0.2 0.36 ± 0.01 10 ± 1 68 ± 0 < 0.03 ± 0.01 < 0.001 ± 0.001 38 ± 1 

15565447 05/26/04 24 ± 0 0.82 ± 0.02 6.5 ± 0.9 35 ± 0 < 0.03 ± 0.01 0.008 ± 0.003 23 ± 1 15565447 06/15/04 16 ± 1 0.87 ± 0.01 7.4 ± 0.6 41 ± 1 < 0.03 ± 0.01 0.004 ± 0.002 27 ± 1 

15565447 07/20/04 15 ± 1 0.89 ± 0.02 13 ± 0 50 ± 1 < 0.03 ± 0.01 < 0.001 ± 0.001 29 ± 0 

15565447 08/18/04 15 ± 1 0.86 ± 0.02 16 ± 1 51 ± 1 < 0.03 ± 0.02 0.003 ± 0.000 32 ± 2 

15565447 09/22/04 8.6 ± 1.0 0.80 ± 0.02 17 ± 1 51 ± 1 < 0.01 ± 0.01 0.007 ± 0.004 34 ± 1 

27
Table 8. Selected dissolved major cations and trace elements from fixed-station sampling sites in the Yukon River Basin—Continued 

Station ID Date Cadmium Cerium Cobalt Chromium Cesium Copper

μg/L μg/L μg/L μg/L μg/L μg/L

A SD A SD A SD A SD A SD A SD

15356000 04/13/04 0.014 ± 0.004 0.0043 ± 0.0006 0.017 ± 0.007 < 0.3 ± 0.2 < 0.02 ± 0.00 0.65 ± 0.04 15356000 06/17/04 0.021 ± 0.003 0.084 ± 0.001 0.14 ± 0.01 < 0.3 ± 0.1 < 0.02 ± 0.00 1.6 ± 0.0 15356000 06/30/04 < 0.004 ± 0.002 0.0057 ± 0.0003 0.018 ± 0.008 < 0.3 ± 0.1 < 0.02 ± 0.00 1.0 ± 0.1 

15356000 07/20/04 < 0.004 ± 0.002 0.0051 ± 0.0004 0.020 ± 0.014 < 0.3 ± 0.1 < 0.02 ± 0.00 0.91 ± 0.03 

15356000 08/19/04 0.004 ± 0.002 0.0044 ± 0.0006 0.025 ± 0.014 < 0.2 ± 0.1 < 0.02 ± 0.00 0.92 ± 0.04 

15356000 09/06/04 0.021 ± 0.002 0.062 ± 0.001 0.49 ± 0.00 < 0.3 ± 0.0 < 0.02 ± 0.00 0.85 ± 0.04 

15389000 04/09/04 0.010 ± 0.003 0.0022 ± 0.0004 0.051 ± 0.004 < 0.3 ± 0.2 < 0.02 ± 0.00 0.49 ± 0.04 

15389000 06/02/04 0.013 ± 0.002 0.21 ± 0.01 0.13 ± 0.01 < 0.3 ± 0.1 < 0.02 ± 0.00 2.6 ± 0.0 15389000 06/07/04 0.009 ± 0.004 0.11 ± 0.00 0.070 ± 0.005 < 0.3 ± 0.0 < 0.02 ± 0.00 4.5 ± 0.0 

15389000 06/11/04 0.009 ± 0.003 0.10 ± 0.00 0.067 ± 0.002 < 0.3 ± 0.1 < 0.02 ± 0.00 1.9 ± 0.1 

15389000 07/29/04 0.008 ± 0.003 0.0044 ± 0.0003 0.048 ± 0.008 < 0.3 ± 0.2 < 0.02 ± 0.00 1.4 ± 0.0 

15389000 08/09/04 0.008 ± 0.000 0.043 ± 0.000 0.060 ± 0.014 < 0.3 ± 0.1 < 0.02 ± 0.00 3.2 ± 0.0 

15389000 09/09/04 0.022 ± 0.000 0.0099 ± 0.0006 0.055 ± 0.006 0.2 ± 0.1 < 0.02 ± 0.00 1.1 ± 0.1 

15453500 04/01/04 0.009 ± 0.003 0.0045 ± 0.0002 0.025 ± 0.016 < 0.3 ± 0.1 < 0.02 ± 0.00 0.60 ± 0.03 

15453500 06/04/04 0.017 ± 0.004 0.14 ± 0.00 0.066 ± 0.010 < 0.3 ± 0.1 < 0.02 ± 0.00 3.7 ± 0.0 

15453500 06/09/04 0.014 ± 0.002 0.080 ± 0.000 0.052 ± 0.008 < 0.3 ± 0.1 < 0.02 ± 0.00 2.9 ± 0.0 

15453500 06/23/04 0.010 ± 0.002 0.098 ± 0.000 0.036 ± 0.006 < 0.3 ± 0.1 < 0.02 ± 0.00 1.8 ± 0.0 

15453500 07/13/04 0.007 ± 0.002 0.0063 ± 0.0004 0.020 ± 0.005 < 0.3 ± 0.1 < 0.02 ± 0.00 1.4 ± 0.1 

15453500 08/17/04 0.004 ± 0.000 0.0076 ± 0.0002 0.016 ± 0.008 < 0.3 ± 0.1 < 0.02 ± 0.00 1.4 ± 0.1 

15453500 09/10/04 0.009 ± 0.002 0.0071 ± 0.0004 0.032 ± 0.003 < 0.2 ± 0.0 < 0.02 ± 0.00 2.1 ± 0.1 

28
Table 8. Selected dissolved major cations and trace elements from fixed-station sampling sites in the Yukon River Basin—Continued 

Station ID Date Cadmium Cerium Cobalt Chromium Cesium Copper

μg/L μg/L μg/L μg/L μg/L μg/L

A SD A SD A SD A SD A SD A SD

15515500 03/30/04 0.016 ± 0.003 0.0037 ± 0.0007 0.12 ± 0.02 < 0.3 ± 0.1 < 0.02 ± 0.00 0.72 ± 0.03 15515500 05/28/04 0.020 ± 0.006 0.062 ± 0.003 0.076 ± 0.010 < 0.3 ± 0.1 < 0.02 ± 0.01 5.2 ± 0.3 

15515500 06/10/04 0.011 ± 0.003 0.019 ± 0.000 0.040 ± 0.008 < 0.3 ± 0.1 < 0.02 ± 0.00 1.5 ± 0.0 

15515500 06/25/04 0.010 ± 0.002 0.0088 ± 0.0002 0.024 ± 0.008 < 0.3 ± 0.1 < 0.02 ± 0.00 0.89 ± 0.05 

15515500 07/23/04 0.010 ± 0.001 0.0068 ± 0.0003 0.043 ± 0.012 < 0.3 ± 0.1 < 0.02 ± 0.00 0.64 ± 0.05 

15515500 08/26/04 0.013 ± 0.001 0.0056 ± 0.0003 0.078 ± 0.014 < 0.2 ± 0.1 < 0.02 ± 0.00 1.7 ± 0.0 

15515500 09/22/04 0.024 ± 0.001 0.011 ± 0.000 0.14 ± 0.01 0.3 ± 0.1 < 0.02 ± 0.00 1.1 ± 0.0 15565447 04/07/04 0.030 ± 0.004 0.0088 ± 0.0006 0.17 ± 0.01 < 0.3 ± 0.1 < 0.02 ± 0.00 1.0 ± 0.0 

15565447 04/16/04 0.032 ± 0.000 0.011 ± 0.001 0.11 ± 0.02 < 0.3 ± 0.1 < 0.02 ± 0.00 1.2 ± 0.1 15565447 04/23/04 0.022 ± 0.003 0.013 ± 0.000 0.11 ± 0.01 < 0.3 ± 0.1 < 0.02 ± 0.00 1.3 ± 0.1 15565447 04/23/04 0.020 ± 0.004 0.019 ± 0.001 0.14 ± 0.02 < 0.3 ± 0.1 < 0.02 ± 0.00 1.2 ± 0.0 15565447 04/23/04 0.021 ± 0.002 0.019 ± 0.000 0.14 ± 0.01 < 0.3 ± 0.1 < 0.02 ± 0.00 1.2 ± 0.0 15565447 05/26/04 0.021 ± 0.003 0.30 ± 0.01 0.093 ± 0.009 < 0.3 ± 0.1 < 0.02 ± 0.00 5.4 ± 0.0 

15565447 06/15/04 0.009 ± 0.002 0.12 ± 0.00 0.075 ± 0.016 < 0.3 ± 0.1 < 0.02 ± 0.00 3.7 ± 0.2 

15565447 07/20/04 0.005 ± 0.001 0.011 ± 0.001 0.013 ± 0.004 < 0.3 ± 0.1 < 0.02 ± 0.00 1.7 ± 0.1 

15565447 08/18/04 0.007 ± 0.001 0.011 ± 0.001 0.022 ± 0.015 < 0.3 ± 0.1 < 0.02 ± 0.00 1.6 ± 0.1 

15565447 09/22/04 0.008 ± 0.003 0.027 ± 0.001 0.057 ± 0.012 < 0.2 ± 0.1 < 0.02 ± 0.00 1.3 ± 0.0 

29
Table 8. Selected dissolved major cations and trace elements from fixed-station sampling sites in the Yukon River Basin—Continued 

Station ID Date Dysprosium Erbium Europium Iron Gallium Gadolinium

μg/L μg/L μg/L μg/L μg/L μg/L

A SD A SD A SD A SD A SD A SD

15356000 04/13/04 0.002 ± 0.001 0.001 ± 0.001 0.0027 ± 0.0009 9 ± 3 0.004 ± 0.001 0.002 ± 0.000 15356000 06/17/04 0.011 ± 0.001 0.007 ± 0.000 0.0049 ± 0.0015 98 ± 4 0.024 ± 0.001 0.013 ± 0.000 

15356000 06/30/04 < 0.001 ± 0.000 < 0.001 ± 0.001 0.0012 ± 0.0017 4 ± 1 0.042 ± 0.001 < 0.001 ± 0.000 

15356000 07/20/04 < 0.001 ± 0.001 < 0.001 ± 0.001 0.0021 ± 0.0021 5 ± 3 0.043 ± 0.001 < 0.001 ± 0.001 

15356000 08/19/04 0.0018 ± 0.0008 < 0.001 ± 0.000 < 0.0007 ± 0.0025 5 ± 6 0.041 ± 0.001 0.0016 ± 0.0009 

15356000 09/06/04 0.006 ± 0.001 0.004 ± 0.001 0.0027 ± 0.0006 94 ± 5 0.030 ± 0.002 0.008 ± 0.001 

15389000 04/09/04 0.002 ± 0.001 < 0.001 ± 0.001 0.0076 ± 0.0004 15 ± 2 0.003 ± 0.001 0.002 ± 0.001 

15389000 06/02/04 0.056 ± 0.000 0.028 ± 0.001 0.016 ± 0.002 470 ± 11 0.010 ± 0.001 0.068 ± 0.005 

15389000 06/07/04 0.031 ± 0.001 0.018 ± 0.001 0.0088 ± 0.0013 217 ± 11 0.009 ± 0.001 0.037 ± 0.002 

15389000 06/11/04 0.031 ± 0.001 0.019 ± 0.000 0.0092 ± 0.0015 264 ± 2 0.008 ± 0.001 0.037 ± 0.000 

15389000 07/29/04 0.002 ± 0.001 < 0.001 ± 0.001 0.0020 ± 0.0044 11 ± 2 0.008 ± 0.001 0.002 ± 0.000 

15389000 08/09/04 0.015 ± 0.001 0.008 ± 0.000 0.0053 ± 0.0038 109 ± 8 0.006 ± 0.002 0.018 ± 0.001 

15389000 09/09/04 0.0057 ± 0.0004 0.004 ± 0.001 < 0.0007 ± 0.0034 25 ± 2 0.004 ± 0.001 0.0049 ± 0.0013 

15453500 04/01/04 < 0.001 ± 0.000 < 0.001 ± 0.001 0.0041 ± 0.0041 25 ± 5 0.004 ± 0.001 0.002 ± 0.001 

15453500 06/04/04 0.029 ± 0.001 0.018 ± 0.000 0.0092 ± 0.0010 149 ± 13 0.016 ± 0.001 0.033 ± 0.001 

15453500 06/09/04 0.019 ± 0.001 0.013 ± 0.001 0.0067 ± 0.0011 89 ± 6 0.016 ± 0.001 0.020 ± 0.001 

15453500 06/23/04 0.006 ± 0.001 0.004 ± 0.001 0.0044 ± 0.0019 26 ± 1 0.020 ± 0.002 0.009 ± 0.001 

15453500 07/13/04 0.002 ± 0.000 < 0.001 ± 0.001 0.0013 ± 0.0011 4 ± 2 0.036 ± 0.000 0.001 ± 0.001 

15453500 08/17/04 < 0.001 ± 0.000 0.002 ± 0.001 0.0006 ± 0.0009 8 ± 6 0.034 ± 0.000 0.002 ± 0.001 

15453500 09/10/04 0.0022 ± 0.0008 0.002 ± 0.001 < 0.0007 ± 0.0024 11 ± 3 0.017 ± 0.001 0.0018 ± 0.0003 

30
Table 8. Selected dissolved major cations and trace elements from fixed-station sampling sites in the Yukon River Basin—Continued 

Station ID Date Dysprosium Erbium Europium Iron Gallium Gadolinium

μg/L μg/L μg/L μg/L μg/L μg/L

A SD A SD A SD A SD A SD A SD

15515500 03/30/04 0.001 ± 0.001 0.002 ± 0.000 0.0010 ± 0.0018 13 ± 1 0.005 ± 0.000 0.002 ± 0.001 15515500 05/28/04 0.015 ± 0.000 0.010 ± 0.001 0.0030 ± 0.0010 72 ± 9 0.021 ± 0.001 0.013 ± 0.001 

15515500 06/10/04 0.004 ± 0.001 0.003 ± 0.001 0.0015 ± 0.0009 28 ± 2 0.028 ± 0.003 0.004 ± 0.001 

15515500 06/25/04 < 0.001 0.000 < 0.001 0.001 0.0010 0.0020 13 1 0.050 0.001 < 0.001 0.001 

15515500 07/23/04 < 0.001 ± 0.001 < 0.001 ± 0.001 0.0013 ± 0.0015 5 ± 2 0.044 ± 0.002 < 0.001 ± 0.001 

15515500 08/26/04 0.0013 ± 0.0004 < 0.001 ± 0.000 < 0.0007 ± 0.0016 4 ± 0 0.034 ± 0.002 0.0014 ± 0.0008 15515500 09/22/04 0.0034 ± 0.0009 0.002 ± 0.001 < 0.0007 ± 0.0016 29 ± 3 0.013 ± 0.000 0.0022 ± 0.0001 15565447 04/07/04 0.002 ± 0.000 0.002 ± 0.001 0.0055 ± 0.0013 104 ± 7 0.004 ± 0.001 0.002 ± 0.000 

15565447 04/16/04 0.003 ± 0.001 0.003 ± 0.001 0.0013 ± 0.0027 77 ± 3 0.005 ± 0.001 0.003 ± 0.001 

15565447 04/23/04 0.003 ± 0.001 0.002 ± 0.001 0.0029 ± 0.0035 89 ± 15 0.004 ± 0.001 0.004 ± 0.000 15565447 04/23/04 0.004 ± 0.001 0.003 ± 0.001 0.0053 ± 0.0003 112 ± 8 0.003 ± 0.001 0.004 ± 0.000 

15565447 04/23/04 0.004 ± 0.001 0.003 ± 0.001 0.0038 ± 0.0020 114 ± 13 0.005 ± 0.001 0.004 ± 0.001 15565447 05/26/04 0.053 ± 0.000 0.036 ± 0.002 0.014 ± 0.002 464 ± 38 0.015 ± 0.001 0.061 ± 0.003 15565447 06/15/04 0.020 ± 0.000 0.015 ± 0.002 0.0056 ± 0.0003 191 ± 3 0.018 ± 0.002 0.027 ± 0.001 

15565447 07/20/04 0.002 ± 0.001 0.003 ± 0.001 0.0007 ± 0.0006 24 ± 0 0.031 ± 0.001 0.002 ± 0.001 

15565447 08/18/04 0.003 ± 0.001 0.001 ± 0.001 0.0022 ± 0.0033 24 ± 2 0.030 ± 0.002 0.003 ± 0.001 

15565447 09/22/04 0.0053 ± 0.0011 0.003 ± 0.001 < 0.0007 ± 0.0038 129 ± 1 0.017 ± 0.002 0.0056 ± 0.0008 

31
Table 8. Selected dissolved major cations and trace elements from fixed-station sampling sites in the Yukon River Basin—Continued 

Station ID Date Holmium Potassium Lanthanum Lithium Lutetium Magnesium

μg/L mg/L μg/L μg/L μg/L mg/L

A SD A SD A SD A SD A SD A SD

15356000 04/13/04 0.0004 ± 0.0002 1.0 ± 0.0 0.0046 ± 0.0005 2.2 ± 0.1 < 0.0003 ± 0.0001 8.8 ± 0.5 15356000 06/17/04 0.0023 ± 0.0004 0.97 ± 0.04 0.047 ± 0.000 2.3 ± 0.1 0.0010 ± 0.0001 7.7 ± 0.1 

15356000 06/30/04 0.0003 ± 0.0003 1.7 ± 0.0 0.0040 ± 0.0004 2.9 ± 0.3 < 0.0003 ± 0.0001 7.0 ± 0.0 15356000 07/20/04 < 0.0003 ± 0.0003 1.8 ± 0.0 0.0036 ± 0.0004 3.3 ± 0.2 < 0.0003 ± 0.0000 7.8 ± 0.3 15356000 08/19/04 < 0.0003 ± 0.0002 1.8 ± 0.0 0.0030 ± 0.0001 3.4 ± 0.2 0.0003 ± 0.0001 7.4 ± 0.0 15356000 09/06/04 0.0013 ± 0.0003 1.4 ± 0.0 0.032 ± 0.000 2.8 ± 0.3 0.0006 ± 0.0000 7.9 ± 0.3 

15389000 04/09/04 0.0004 ± 0.0002 0.58 ± 0.02 0.0030 ± 0.0002 6.8 ± 0.5 < 0.0003 ± 0.0002 12 ± 0 

15389000 06/02/04 0.011 ± 0.001 0.81 ± 0.05 0.092 ± 0.002 1.7 ± 0.1 0.0030 ± 0.0001 2.9 ± 0.1 

15389000 06/07/04 0.0061 ± 0.0004 0.61 ± 0.04 0.054 ± 0.001 1.9 ± 0.2 0.0019 ± 0.0001 3.5 ± 0.2 

15389000 06/11/04 0.0065 ± 0.0002 0.62 ± 0.02 0.049 ± 0.002 2.6 ± 0.1 0.0020 ± 0.0001 4.2 ± 0.1 

15389000 07/29/04 0.0004 ± 0.0002 0.68 ± 0.03 0.0038 ± 0.0002 4.7 ± 0.1 < 0.0003 ± 0.0003 7.9 ± 0.2 

15389000 08/09/04 0.0031 ± 0.0000 0.63 ± 0.02 0.021 ± 0.002 5.5 ± 0.5 0.0008 ± 0.0000 8.1 ± 0.2 

15389000 09/09/04 0.0011 ± 0.0002 0.61 ± 0.02 0.0055 ± 0.0004 5.8 ± 0.5 0.0003 ± 0.0000 9.1 ± 0.3 

15453500 04/01/04 0.0003 ± 0.0002 1.1 ± 0.0 0.0046 ± 0.0000 3.1 ± 0.2 < 0.0003 ± 0.0001 9.9 ± 0.4 

15453500 06/04/04 0.0058 ± 0.0004 0.98 ± 0.04 0.078 ± 0.003 2.0 ± 0.2 0.0023 ± 0.0002 4.8 ± 0.0 

15453500 06/09/04 0.0038 ± 0.0002 0.92 ± 0.02 0.048 ± 0.003 2.0 ± 0.1 0.0013 ± 0.0002 5.7 ± 0.5 

15453500 06/23/04 0.0012 ± 0.0002 1.1 ± 0.0 0.053 ± 0.001 2.6 ± 0.1 0.0005 ± 0.0001 7.1 ± 0.4 

15453500 07/13/04 0.0004 ± 0.0003 1.7 ± 0.0 0.0044 ± 0.0001 3.2 ± 0.2 < 0.0003 ± 0.0003 7.9 ± 0.6 15453500 08/17/04 0.0005 ± 0.0001 1.6 ± 0.0 0.0051 ± 0.0006 3.5 ± 0.1 < 0.0003 ± 0.0002 8.7 ± 0.1 15453500 09/10/04 0.0005 ± 0.0002 1.4 ± 0.0 0.0047 ± 0.0004 3.9 ± 0.3 < 0.0002 ± 0.0001 9.0 ± 0.1 

32
Table 8. Selected dissolved major cations and trace elements from fixed-station sampling sites in the Yukon River Basin—Continued 

Station ID Date Manganese Molybdenum Sodium Neodymium Nickel Phosphorus Lead

μg/L μg/L mg/L μg/L μg/L mg/L μg/L

A SD A SD A SD A SD A SD A SD A SD

15356000 04/13/04 1.4 ± 0.1 1.3 ± 0.1 2.3 ± 0.2 0.0052 ± 0.0014 0.78 ± 0.25 < 7 ± 3 0.022 ± 0.003 15356000 06/17/04 3.5 ± 0.1 0.99 ± 0.05 1.7 ± 0.1 0.049 ± 0.000 1.4 ± 0.3 < 7 ± 4 0.080 ± 0.005 15356000 06/30/04 0.47 ± 0.04 1.5 ± 0.0 2.1 ± 0.2 0.0040 ± 0.0011 0.70 ± 0.28 < 7 ± 4 < 0.004 ± 0.003 

15356000 07/20/04 0.63 ± 0.01 1.6 ± 0.0 2.7 ± 0.1 0.0031 ± 0.0011 0.71 ± 0.33 < 7 ± 8 0.011 ± 0.002 

15356000 08/19/04 0.79 ± 0.05 1.9 ± 0.0 2.6 ± 0.2 0.004 ± 0.001 0.73 ± 0.32 < 7 ± 4 0.010 ± 0.009 15356000 09/06/04 3.2 ± 0.1 1.5 ± 0.0 2.6 ± 0.2 0.037 ± 0.001 1.2 ± 0.2 < 7 ± 6 0.031 ± 0.003 15389000 04/09/04 11 ± 0 0.70 ± 0.03 4.4 ± 0.0 0.0044 ± 0.0007 1.0 ± 0.5 < 7 ± 7 0.013 ± 0.006 

15389000 06/02/04 6.7 ± 0.0 0.32 ± 0.04 0.90 ± 0 0.

2

0.17 ± 0.01 3.0 ± 0.3 8 ± 3 0.19 ± 0.00 

15389000 06/07/04 4.3 ± 0.2 0.32 ± 0.03 1.1 ± 0.0 0.097 ± 0.006 2.1 ± 0.2 < 7 ± 10 0.12 ± 0.00 15389000 06/11/04 4.6 ± 0.0 0.37 ± 0.05 1.5 ± 0.0 0.094 ± 0.002 2.1 ± 0.1 9 ± 12 0.12 ± 0.00 15389000 07/29/04 0.62 ± 0.07 0.72 ± 0.07 3.2 ± 0.3 0.0060 ± 0.0011 0.77 ± 0.47 < 7 ± 5 0.050 ± 0.007 

15389000 08/09/04 4.5 ± 0.1 0.33 ± 0.04 2.8 ± 0.2 0.041 ± 0.001 1.6 ± 0.4 < 7 ± 3 0.058 ± 0.007 15389000 09/09/04 4.7 ± 0.1 0.55 ± 0.03 3.7 ± 0.2 0.010 ± 0.001 1.3 ± 0.3 < 7 ± 2 0.041 ± 0.003 15453500 04/01/04 18 ± 0 1.2 ± 0.1 2.7 ± 0.1 0.0057 ± 0.0016 1.3 ± 0.1 < 7 ± 0 0.010 ± 0.000 

15453500 06/04/04 4.0 ± 0.0 0.71 ± 0.04 1.3 ± 0.1 0.10 ± 0.01 2.2 ± 0.2 < 7 ± 4 0.098 ± 0.003 

15453500 06/09/04 3.6 ± 0.1 0.73 ± 0.01 1.4 ± 0.1 0.060 ± 0.000 1.9 ± 0.3 < 7 ± 6 0.057 ± 0.003 15453500 06/23/04 3.6 ± 0.2 0.98 ± 0.03 1.7 ± 0.1 0.051 ± 0.001 1.1 ± 0.3 < 7 ± 5 0.020 ± 0.002 15453500 07/13/04 3.0 ± 0.2 1.4 ± 0.0 2.4 ± 0.2 0.0045 ± 0.0010 0.52 ± 0.21 < 7 ± 7 0.013 ± 0.000 

15453500 08/17/04 1.6 ± 0.1 1.4 ± 0.0 2.9 ± 0.0 0.0069 ± 0.0016 0.38 ± 0.17 < 7 ± 4 0.006 ± 0.002 

15453500 09/10/04 8.7 ± 0.1 1.5 ± 0.1 3.1 ± 0.1 0.005 ± 0.001 1.0 ± 0.5 < 7 ± 12 0.021 ± 0.004 

33
Table 8. Selected dissolved major cations and trace elements from fixed-station sampling sites in the Yukon River Basin—Continued 

Station ID Date Manganese Molybdenum Sodium Neodymium Nickel Phosphorus Lead

μg/L μg/L mg/L μg/L μg/L mg/L μg/L

A SD A SD A SD A SD A SD A SD A SD

15356000 04/13/04 1.4 ± 0.1 1.3 ± 0.1 2.3 ± 0.2 0.0052 ± 0.0014 0.78 ± 0.25 < 7 ± 3 0.022 ± 0.003 15356000 06/17/04 3.5 ± 0.1 0.99 ± 0.05 1.7 ± 0.1 0.049 ± 0.000 1.4 ± 0.3 < 7 ± 4 0.080 ± 0.005 15356000 06/30/04 0.47 ± 0.04 1.5 ± 0.0 2.1 ± 0.2 0.0040 ± 0.0011 0.70 ± 0.28 < 7 ± 4 < 0.004 ± 0.003 

15356000 07/20/04 0.63 ± 0.01 1.6 ± 0.0 2.7 ± 0.1 0.0031 ± 0.0011 0.71 ± 0.33 < 7 ± 8 0.011 ± 0.002 

15356000 08/19/04 0.79 ± 0.05 1.9 ± 0.0 2.6 ± 0.2 0.004 ± 0.001 0.73 ± 0.32 < 7 ± 4 0.010 ± 0.009 15356000 09/06/04 3.2 ± 0.1 1.5 ± 0.0 2.6 ± 0.2 0.037 ± 0.001 1.2 ± 0.2 < 7 ± 6 0.031 ± 0.003 15389000 04/09/04 11 ± 0 0.70 ± 0.03 4.4 ± 0.0 0.0044 ± 0.0007 1.0 ± 0.5 < 7 ± 7 0.013 ± 0.006 

15389000 06/02/04 6.7 ± 0.0 0.32 ± 0.04 0.90 ± 0 0.

2

0.17 ± 0.01 3.0 ± 0.3 8 ± 3 0.19 ± 0.00 

15389000 06/07/04 4.3 ± 0.2 0.32 ± 0.03 1.1 ± 0.0 0.097 ± 0.006 2.1 ± 0.2 < 7 ± 10 0.12 ± 0.00 15389000 06/11/04 4.6 ± 0.0 0.37 ± 0.05 1.5 ± 0.0 0.094 ± 0.002 2.1 ± 0.1 9 ± 12 0.12 ± 0.00 15389000 07/29/04 0.62 ± 0.07 0.72 ± 0.07 3.2 ± 0.3 0.0060 ± 0.0011 0.77 ± 0.47 < 7 ± 5 0.050 ± 0.007 

15389000 08/09/04 4.5 ± 0.1 0.33 ± 0.04 2.8 ± 0.2 0.041 ± 0.001 1.6 ± 0.4 < 7 ± 3 0.058 ± 0.007 15389000 09/09/04 4.7 ± 0.1 0.55 ± 0.03 3.7 ± 0.2 0.010 ± 0.001 1.3 ± 0.3 < 7 ± 2 0.041 ± 0.003 15453500 04/01/04 18 ± 0 1.2 ± 0.1 2.7 ± 0.1 0.0057 ± 0.0016 1.3 ± 0.1 < 7 ± 0 0.010 ± 0.000 

15453500 06/04/04 4.0 ± 0.0 0.71 ± 0.04 1.3 ± 0.1 0.10 ± 0.01 2.2 ± 0.2 < 7 ± 4 0.098 ± 0.003 

15453500 06/09/04 3.6 ± 0.1 0.73 ± 0.01 1.4 ± 0.1 0.060 ± 0.000 1.9 ± 0.3 < 7 ± 6 0.057 ± 0.003 15453500 06/23/04 3.6 ± 0.2 0.98 ± 0.03 1.7 ± 0.1 0.051 ± 0.001 1.1 ± 0.3 < 7 ± 5 0.020 ± 0.002 15453500 07/13/04 3.0 ± 0.2 1.4 ± 0.0 2.4 ± 0.2 0.0045 ± 0.0010 0.52 ± 0.21 < 7 ± 7 0.013 ± 0.000 

15453500 08/17/04 1.6 ± 0.1 1.4 ± 0.0 2.9 ± 0.0 0.0069 ± 0.0016 0.38 ± 0.17 < 7 ± 4 0.006 ± 0.002 

15453500 09/10/04 8.7 ± 0.1 1.5 ± 0.1 3.1 ± 0.1 0.005 ± 0.001 1.0 ± 0.5 < 7 ± 12 0.021 ± 0.004 

34
Table 8. Selected dissolved major cations and trace elements from fixed-station sampling sites in the Yukon River Basin—Continued 

Station ID Date Manganese Molybdenum Sodium Neodymium Nickel Phosphorus Lead

μg/L μg/L mg/L μg/L μg/L mg/L μg/L 

A SD A SD A SD A SD A SD A SD A SD 

15515500 03/30/04 95 ± 0 1.3 ± 0.2 4.0 ± 0.0 0.0034 ± 0.0013 0.53 ± 0.26 < 7 ± 7 0.018 ± 0.008 15515500 05/28/04 11 ± 0 1.2 ± 0.4 3.0 ± 0.3 0.044 ± 0.000 1.3 ± 0.3 < 7 ± 4 0.10 ± 0.01 15515500 06/10/04 6.0 ± 0.2 1.1 ± 0.0 3.6 ± 0.1 0.014 ± 0.001 0.78 ± 0.24 < 7 ± 6 0.028 ± 0.001 15515500 06/25/04 2.2 ± 0.1 1.3 ± 0.0 3.3 ± 0.1 0.0060 ± 0.0007 0.60 ± 0.30 < 7 ± 4 0.026 ± 0.002 15515500 07/23/04 2.4 ± 0.1 1.2 ± 0.1 2.9 ± 0.2 0.0047 ± 0.0009 0.74 ± 0.24 < 7 ± 7 0.013 ± 0.002 15515500 08/26/04 14 ± 0 1.3 ± 0.0 3.3 ± 0.2 0.004 ± 0.001 1.1 ± 0.5 < 7 ± 1 0.013 ± 0.005 

15515500 09/22/04 56 ± 1 1.4 ± 0.1 4.2 ± 0.1 0.008 ± 0.000 1.2 ± 0.3 < 7 ± 3 0.025 ± 0.004 

15565447 04/07/04 152 ± 3 0.77 ± 0.01 3.4 ± 0.0 0.0075 ± 0.0007 1.2 ± 0.4 < 7 ± 4 0.016 ± 0.002 

15565447 04/16/04 147 ± 9 0.71 ± 0.08 3.3 ± 0.0 0.0093 ± 0.0007 0.96 ± 0.40 8 ± 7 0.029 ± 0.012 

15565447 04/23/04 150 ± 5 0.71 ± 0.05 3.3 ± 0.1 0.0089 ± 0.0007 1.0 ± 0.3 7 ± 8 0.021 ± 0.001 15565447 04/23/04 129 ± 1 0.62 ± 0.04 2.8 ± 0.0 0.012 ± 0.003 1.1 ± 0.5 9 ± 3 0.034 ± 0.003 15565447 04/23/04 133 ± 8 0.63 ± 0.06 2.9 ± 0.3 0.012 ± 0.000 1.0 ± 0.4 8 ± 9 0.039 ± 0.010 15565447 05/26/04 17 ± 0 0.54 ± 0.11 1.6 ± 0.2 0.21 ± 0.00 2.2 ± 0.3 13 ± 1 0.22 ± 0.01 

15565447 06/15/04 15 ± 0 0.66 ± 0.01 1.6 ± 0.0 0.080 ± 0.001 1.5 ± 0.4 8 ± 3 0.12 ± 0.00 

15565447 07/20/04 0.52 ± 0.04 1.3 ± 0.0 2.4 ± 0.0 0.0092 ± 0.0018 0.49 ± 0.18 < 7 ± 5 0.025 ± 0.002 

15565447 08/18/04 1.9 ± 0.1 1.3 ± 0.0 2.9 ± 0.0 0.0088 ± 0.0002 0.47 ± 0.42 < 7 ± 7 0.016 ± 0.003 15565447 09/22/04 16 ± 1 1.4 ± 0.1 3.0 ± 0.1 0.020 ± 0.002 0.84 ± 0.27 < 7 ± 1 0.068 ± 0.004 

35
Table 8. Selected dissolved major cations and trace elements from fixed-station sampling sites in the Yukon River Basin—Continued 

Station ID Date Praseodymium Rubidium Rhenium Sulfur Antimony Selenium Silica

μg/L μg/L μg/L mg/L μg/L μg/L mg/L

A SD A SD A SD A SD A SD A SD A SD

15356000 04/13/04 0.0012 ± 0.0001 0.77 ± 0.01 0.0019 ± 0.0003 12 ± 0 0.096 ± 0.002 0.42 ± 0.10 5.8 ± 0.3 15356000 06/17/04 0.012 ± 0.000 1.1 ± 0.0 0.0028 ± 0.0003 12 ± 0 0.20 ± 0.01 0.45 ± 0.12 5.9 ± 0.1 

15356000 06/30/04 0.0008 ± 0.0002 2.4 ± 0.0 0.0031 ± 0.0001 12 ± 0 0.25 ± 0.00 0.42 ± 0.11 5.0 ± 0.1 

15356000 07/20/04 0.0007 ± 0.0003 2.3 ± 0.0 0.0036 ± 0.0003 13 ± 0 0.27 ± 0.01 0.37 ± 0.04 5.3 ± 0.2 

15356000 08/19/04 0.0006 ± 0.0002 2.3 ± 0.1 0.0037 ± 0.0003 13 ± 0 0.25 ± 0.00 0.33 ± 0.10 4.9 ± 0.3 

15356000 09/06/04 0.0085 ± 0.0001 1.5 ± 0.0 0.0041 ± 0.0006 13 ± 1 0.27 ± 0.01 0.33 ± 0.06 5.5 ± 0.2 

15389000 04/09/04 0.0006 ± 0.0002 0.34 ± 0.01 0.0036 ± 0.0002 13 ± 0 0.056 ± 0.001 0.36 ± 0.15 4.3 ± 0.3 

15389000 06/02/04 0.034 ± 0.002 0.29 ± 0.01 0.0009 ± 0.0001 4.0 ± 0.2 0.090 ± 0.011 0.15 ± 0.08 2.1 ± 0.1 15389000 06/07/04 0.019 ± 0.001 0.26 ± 0.00 0.0014 ± 0.0003 5.5 ± 0.2 0.086 ± 0.003 0.17 ± 0.09 2.4 ± 0.1 15389000 06/11/04 0.019 ± 0.001 0.25 ± 0.00 0.0021 ± 0.0002 7.4 ± 0.0 0.098 ± 0.004 0.19 ± 0.09 2.7 ± 0.1 15389000 07/29/04 0.0009 ± 0.0001 0.41 ± 0.02 0.0033 ± 0.0005 14 ± 0 0.083 ± 0.001 0.18 ± 0.06 2.3 ± 0.2 15389000 08/09/04 0.0077 ± 0.0002 0.30 ± 0.01 0.0016 ± 0.0006 20 ± 0 0.065 ± 0.008 0.15 ± 0.12 3.1 ± 0.1 15389000 09/09/04 0.0018 ± 0.0002 0.27 ± 0.01 0.0028 ± 0.0004 19 ± 1 0.070 ± 0.005 < 0.1 ± 0.0 2.4 ± 0.1 

15453500 04/01/04 0.0010 ± 0.0003 0.85 ± 0.01 0.0026 ± 0.0003 14 ± 0 0.089 ± 0.002 0.37 ± 0.12 6.7 ± 0.3 

15453500 06/04/04 0.022 ± 0.001 0.76 ± 0.02 0.0023 ± 0.0003 7.5 ± 0.6 0.17 ± 0.01 0.31 ± 0.09 3.6 ± 0.0 15453500 06/09/04 0.013 ± 0.000 0.79 ± 0.01 0.0027 ± 0.0005 8.7 ± 0.6 0.17 ± 0.01 0.36 ± 0.07 4.3 ± 0.3 15453500 06/23/04 0.013 ± 0.000 1.1 ± 0.0 0.0031 ± 0.0003 11 ± 1 0.18 ± 0.01 0.42 ± 0.06 5.3 ± 0.3 

15453500 07/13/04 0.0009 ± 0.0001 2.3 ± 0.0 0.0041 ± 0.0007 13 ± 1 0.26 ± 0.01 0.40 ± 0.10 5.4 ± 0.4 

15453500 08/17/04 0.0014 ± 0.0003 2.1 ± 0.0 0.0040 ± 0.0001 16 ± 0 0.22 ± 0.00 0.36 ± 0.07 5.4 ± 0.0 

15453500 09/10/04 0.0011 ± 0.0002 1.5 ± 0.0 0.0042 ± 0.0004 16 ± 0 0.19 ± 0.00 0.26 ± 0.02 5.4 ± 0.1 

36
Table 8. Selected dissolved major cations and trace elements from fixed-station sampling sites in the Yukon River Basin—Continued 

Station ID Date Praseodymium Rubidium Rhenium Sulfur Antimony Selenium Silica

μg/L μg/L μg/L mg/L μg/L μg/L mg/L

A SD A SD A SD A SD A SD A SD A SD

03/30/04 0.0007 ± 0.0001 1.2 ± 0.0 0.0038 ± 0.0007 15 ± 0 0.16 ± 0.01 0.60 ± 0.10 16 ± 0 15515500 

15515500 05/28/04 0.010 ± 0.000 1.9 ± 0.0 0.0031 ± 0.0005 14 ± 1 0.28 ± 0.01 0.50 ± 0.08 7.4 ± 0.3 

15515500 06/10/04 0.0031 ± 0.0001 2.3 ± 0.0 0.0044 ± 0.0003 15 ± 0.32 ± 0.01 0.52 ± 0.08 1 7.5 ± 0.3 

15515500 06/25/04 0.0014 ± 0.0002 4.1 ± 0.1 0.0041 ± 15 ± 1 0.53 ± 0.00 0.0005 0.51 ± 0.10 6.2 ± 0.1 

07/23/04 0.0010 ± 0.0002 2.8 ± 0.0044 ± 0.0002 14 ± 0 ± 0.01 0.46 ± 0.00 5.5 ± 15515500 0.0 0.38 0.3 

15515500 08/26/04 0.0009 ± 2.1 ± 0.0 0.0047 ± 0.0007 0.0003 17 ± 1 0.31 ± 0.00 0.43 ± 0.09 5.8 ± 0.3 

15515500 09/22/04 0.0016 ± 0.0001 1.5 ± 0.0 0.0038 ± 0.0004 16 ± 0 0.20 ± 0.00 0.44 ± 0.02 11 ± 0 

0 0.087 ± 0.004 0.33 ± 15565447 04/07/04 0.0015 ± 0.0001 1.5 ± 0.0 0.0027 ± 0.0003 11 ± 0.08 13 ± 0 

15565447 04/16/04 0.0019 ± 0.0002 1.5 ± 0.0 0.0024 ± 0.0003 9.7 ± 0.6 0.094 ± 0.008 0.38 ± 0.08 12 ± 1 

15565447 04/23/04 0.0019 ± 0.0001 1.5 ± 0.0 0.0021 ± 0.0008 9.8 ± 0.091 ± 0.004 0.34 ± 0.05 0.5 12 ± 0 

15565447 04/23/04 0.0026 ± 0.0004 1.4 ± 0.0 0.0019 ± 8.2 ± 0.2 0.099 ± 0.007 0.0004 0.30 ± 0.08 10 ± 0 

04/23/04 0.0031 ± 0.0001 1.4 ± 0.0019 ± 0.0003 8.6 ± 0.6 ± 0.00 0.27 ± 0.06 10 ± 15565447 0.0 0.10 1 

15565447 05/26/04 0.045 ± 0.91 ± 0.01 0.0016 ± 0.0006 0.000 6.2 ± ± 0.5 0.18 0.01 0.21 ± 0.12 5.1 ± 0.1 

15565447 06/15/04 0.018 ± 0.000 1.1 ± 0.0 0.0019 ± 0.0006 8.1 ± 0.1 ± 0.00 0.29 ± 0.08 5.2 ± 0.25 0.1 

± 0.01 0.38 ± 0.08 5.8 ± 15565447 07/20/04 0.0020 ± 0.0002 2.0 ± 0.0 0.0036 ± 0.0003 12 ± 0 0.1 0.34 

15565447 08/18/04 0.0020 ± 0.0002 2.1 ± 0.0 0.0038 ± 0.0003 14 ± 1 0.31 ± 0.02 0.39 ± 0.08 6.4 ± 0.2 

15565447 09/22/04 0.0040 ± 0.0003 1.6 ± 0.0 0.0038 ± 0.0003 14 ± 0 0.24 ± 0.01 0.40 ± 0.04 6.6 ± 0.2 

37
Table 8. Selected dissolved major cations and trace elements from fixed-station sampling sites in the Yukon River Basin—Continued 

Station ID Date Samarium Strontium Terbium Tellurium Thorium Thallium

μg/L μg/L μg/L μg/L μg/L μg/L

A SD A SD A SD A SD A SD A SD

15356000 04/13/04 < 0.002 ± 0.000 155 ± 2 < 0.0002 ± 0.0001 < 0.01 ± 0.00 0.041 ± 0.029 0.005 ± 0.003 15356000 06/17/04 0.011 ± 0.001 122 ± 2 0.0021 ± 0.0002 < 0.01 ± 0.00 0.063 ± 0.004 0.004 ± 0.001 

15356000 06/30/04 < 0.002 ± 0.001 132 ± 0 < 0.0002 ± 0.0001 < 0.01 ± 0.00 0.015 ± 0.006 0.009 ± 0.006 

15356000 07/20/04 < 0.002 ± 0.001 146 ± 1 < 0.0002 ± 0.0001 < 0.01 ± 0.01 0.004 ± 0.002 0.005 ± 0.000 

15356000 08/19/04 < 0.001 ± 0.001 147 ± 2 < 0.0003 ± 0.0002 < 0.005 ± 0.002 0.0093 ± 0.0083 0.028 ± 0.027 15356000 09/06/04 0.007 ± 0.002 147 ± 2 0.0012 ± 0.0002 < 0.01 ± 0.00 0.038 ± 0.011 0.006 ± 0.002 

15389000 04/09/04 0.002 ± 0.001 162 ± 1 0.0003 ± 0.0001 < 0.01 ± 0.01 0.009 ± 0.005 < 0.004 ± 0.000 

15389000 06/02/04 0.050 ± 0.002 45 ± 0 0.0096 ± 0.0007 < 0.01 ± 0.00 0.15 ± 0.01 0.009 ± 0.002 

15389000 06/07/04 0.029 ± 0.001 56 ± 1 0.0053 ± 0.0002 < 0.01 ± 0.01 0.091 ± 0.005 0.006 ± 0.002 

15389000 06/11/04 0.029 ± 0.001 64 ± 1 0.0062 ± 0.0002 < 0.01 ± 0.01 0.099 ± 0.007 0.009 ± 0.005 

15389000 07/29/04 0.002 ± 0.001 143 ± 0 0.0004 ± 0.0002 < 0.01 ± 0.01 0.006 ± 0.003 < 0.004 ± 0.001 

15389000 08/09/04 0.014 ± 0.002 124 ± 1 0.0027 ± 0.0002 < 0.01 ± 0.00 0.023 ± 0.004 < 0.004 ± 0.001 

15389000 09/09/04 0.006 ± 0.000 138 ± 1 0.0009 ± 0.0002 < 0.005 ± 0.006 0.011 ± 0.006 < 0.005 ± 0.001 15453500 04/01/04 < 0.002 ± 0.000 168 ± 2 < 0.0002 ± 0.0002 < 0.01 ± 0.00 0.004 ± 0.002 0.011 ± 0.010 

15453500 06/04/04 0.027 ± 0.001 91 ± 1 0.0051 ± 0.0005 < 0.01 ± 0.00 0.11 ± 0.00 0.008 ± 0.003 

15453500 06/09/04 0.017 ± 0.001 95 ± 1 0.0032 ± 0.0002 < 0.01 ± 0.00 0.061 ± 0.001 0.009 ± 0.002 

15453500 06/23/04 0.008 ± 0.000 122 ± 3 0.0012 ± 0.0001 < 0.01 ± 0.01 0.046 ± 0.009 0.005 ± 0.001 

15453500 07/13/04 < 0.002 ± 0.001 139 ± 2 0.0003 ± 0.0002 < 0.01 ± 0.01 0.003 ± 0.002 0.007 ± 0.003 

15453500 08/17/04 0.002 ± 0.001 144 ± 1 0.0004 ± 0.0002 < 0.01 ± 0.00 0.006 ± 0.005 < 0.004 ± 0.001 

15453500 09/10/04 0.001 ± 0.000 156 ± 0 0.0003 ± 0.0002 < 0.005 ± 0.005 0.0053 ± 0.0006 < 0.005 ± 0.003 

38
Table 8. Selected dissolved major cations and trace elements from fixed-station sampling sites in the Yukon River Basin—Continued 

Station ID Date Samarium Strontium Terbium Tellurium Thorium Thallium

μg/L μg/L μg/L μg/L μg/L μg/L

A SD A SD A SD A SD A SD A SD

15515500 03/30/04 < 0.002 ± 0.002 197 ± 2 < 0.0002 ± 0.0001 < 0.01 ± 0.01 0.004 ± 0.001 0.027 ± 0.027 15515500 05/28/04 0.012 ± 0.002 129 ± 1 0.0018 ± 0.0001 < 0.01 ± 0.01 0.035 ± 0.006 0.016 ± 0.016 

15515500 06/10/04 0.003 ± 0.001 143 ± 0 0.0007 ± 0.0001 < 0.01 ± 0.00 0.030 ± 0.003 0.013 ± 0.001 

15515500 06/25/04 0.002 ± 0.001 130 ± 0 < 0.0002 ± 0.0001 < 0.01 ± 0.00 0.013 ± 0.004 0.009 ± 0.001 

15515500 07/23/04 < 0.002 ± 0.000 130 ± 0 < 0.0002 ± 0.0001 < 0.01 ± 0.01 0.005 ± 0.004 0.006 ± 0.002 

15515500 08/26/04 < 0.001 ± 0.001 130 ± 1 < 0.0003 ± 0.0002 < 0.005 ± 0.004 0.0052 ± 0.0027 0.013 ± 0.011 

15515500 09/22/04 0.002 ± 0.000 182 ± 4 0.0005 ± 0.0002 0.006 ± 0.004 0.035 ± 0.022 0.006 ± 0.002 

15565447 04/07/04 0.002 ± 0.002 198 ± 0 0.0004 ± 0.0002 < 0.01 ± 0.00 0.005 ± 0.002 0.006 ± 0.002 

15565447 04/16/04 0.003 ± 0.001 175 ± 1 0.0005 ± 0.0001 < 0.01 ± 0.01 0.006 ± 0.002 0.004 ± 0.003 

15565447 04/23/04 0.003 ± 0.001 173 ± 2 0.0005 ± 0.0001 < 0.01 ± 0.00 0.005 ± 0.001 < 0.004 ± 0.001 

15565447 04/23/04 0.003 ± 0.001 154 ± 1 0.0005 ± 0.0002 < 0.01 ± 0.00 < 0.002 ± 0.001 < 0.004 ± 0.004 

15565447 04/23/04 0.003 ± 0.001 155 ± 2 0.0005 ± 0.0001 < 0.01 ± 0.00 0.004 ± 0.002 < 0.004 ± 0.002 

15565447 05/26/04 0.050 ± 0.002 88 ± 1 0.0092 ± 0.0002 < 0.01 ± 0.01 0.083 ± 0.005 0.011 ± 0.009 

15565447 06/15/04 0.020 ± 0.000 98 ± 2 0.0039 ± 0.0000 < 0.01 ± 0.00 0.038 ± 0.003 < 0.004 ± 0.000 

15565447 07/20/04 0.003 ± 0.001 131 ± 2 0.0005 ± 0.0001 < 0.01 ± 0.00 0.006 ± 0.002 0.005 ± 0.001 

15565447 08/18/04 0.002 ± 0.001 142 ± 2 0.0005 ± 0.0002 < 0.01 ± 0.01 0.004 ± 0.000 < 0.004 ± 0.001 

15565447 09/22/04 0.006 ± 0.002 155 ± 1 0.0009 ± 0.0001 < 0.005 ± 0.006 0.019 ± 0.006 < 0.005 ± 0.006 

39
Table 8. Selected dissolved major cations and trace elements from fixed-station sampling sites in the Yukon River Basin—Continued 

Station ID Date Thulium Uranium Vanadium Tungsten Yttrium Ytterbium Zinc

μg/L μg/L μg/L μg/L μg/L μg/L μg/L

A SD A SD A SD A SD A SD A SD A SD

15356000 04/13/04 < 0.0003 ± 0.0001 1.1 ± 0.0 0.2 ± 0.0 0.009 ± 0.002 0.016 ± 0.001 0.001 ± 0.001 1.3 ± 0.0 15356000 06/17/04 0.0010 ± 0.0002 0.80 ± 0.01 0.5 ± 0.1 0.010 ± 0.001 0.073 ± 0.001 0.006 ± 0.000 1.3 ± 0.0 

15356000 06/30/04 < 0.0003 ± 0.0001 0.81 ± 0.01 0.5 ± 0.0 0.016 ± 0.001 0.012 ± 0.000 0.001 ± 0.001 < 0.08 ± 0.01 

15356000 07/20/04 < 0.0003 ± 0.0002 0.88 ± 0.03 0.5 ± 0.0 0.016 ± 0.001 0.011 ± 0.001 < 0.001 ± 0.001 0.16 ± 0.02 

15356000 08/19/04 0.0002 ± 0.0001 0.91 ± 0.02 0.50 ± 0.04 0.014 ± 0.001 0.013 ± 0.000 0.002 ± 0.001 0.17 ± 0.03 

15356000 09/06/04 0.0006 ± 0.0002 0.92 ± 0.01 0.5 ± 0.0 0.014 ± 0.001 0.041 ± 0.001 0.004 ± 0.001 2.7 ± 0.1 

15389000 04/09/04 < 0.0003 ± 0.0001 0.80 ± 0.02 < 0.1 ± 0.0 < 0.002 ± 0.001 0.021 ± 0.001 < 0.001 ± 0.000 0.95 ± 0.05 

15389000 06/02/04 0.0035 ± 0.0000 0.19 ± 0.00 0.4 ± 0.1 < 0.002 ± 0.000 0.34 ± 0.00 0.023 ± 0.001 0.53 ± 0.03 

15389000 06/07/04 0.0022 ± 0.0001 0.24 ± 0.01 0.3 ± 0.0 0.034 ± 0.002 0.19 ± 0.01 0.015 ± 0.000 0.29 ± 0.01 

15389000 06/11/04 0.0022 ± 0.0002 0.23 ± 0.01 0.4 ± 0.0 0.003 ± 0.000 0.21 ± 0.00 0.014 ± 0.000 0.44 ± 0.04 

15389000 07/29/04 < 0.0003 ± 0.0000 0.68 ± 0.02 0.2 ± 0.1 0.003 ± 0.001 0.020 ± 0.000 0.002 ± 0.001 0.62 ± 0.01 

15389000 08/09/04 0.0010 ± 0.0003 0.24 ± 0.01 0.2 ± 0.0 < 0.002 ± 0.001 0.092 ± 0.001 0.006 ± 0.001 0.62 ± 0.05 

15389000 09/09/04 0.0006 ± 0.0002 0.46 ± 0.01 0.10 ± 0.01 < 0.002 ± 0.001 0.040 ± 0.000 0.003 ± 0.001 2.2 ± 0.1 15453500 04/01/04 < 0.0003 ± 0.0000 1.0 ± 0.0 0.1 ± 0.1 0.004 ± 0.002 0.018 ± 0.001 < 0.001 ± 0.000 0.24 ± 0.02 

15453500 06/04/04 0.0023 ± 0.0000 0.60 ± 0.02 0.5 ± 0.0 0.008 ± 0.001 0.20 ± 0.00 0.016 ± 0.002 0.51 ± 0.03 

15453500 06/09/04 0.0016 ± 0.0001 0.59 ± 0.01 0.5 ± 0.0 0.009 ± 0.001 0.13 ± 0.00 0.010 ± 0.000 0.14 ± 0.01 

15453500 06/23/04 0.0004 ± 0.0001 0.75 ± 0.01 0.7 ± 0.1 0.011 ± 0.001 0.040 ± 0.001 0.003 ± 0.000 < 0.08 ± 0.01 

15453500 07/13/04 < 0.0003 ± 0.0001 0.89 ± 0.02 0.6 ± 0.0 0.013 ± 0.002 0.015 ± 0.000 0.001 ± 0.000 < 0.08 ± 0.02 

15453500 08/17/04 < 0.0003 ± 0.0002 0.85 ± 0.00 0.5 ± 0.0 0.013 ± 0.003 0.017 ± 0.001 0.002 ± 0.000 < 0.08 ± 0.03 

15453500 09/10/04 0.0004 ± 0.0002 0.97 ± 0.01 0.46 ± 0.02 0.018 ± 0.004 0.018 ± 0.001 0.002 ± 0.001 0.43 ± 0.02 

40
Table 8. Selected dissolved major cations and trace elements from fixed-station sampling sites in the Yukon River Basin—Continued 

Station ID Date Thulium Uranium Vanadium Tungsten Yttrium Ytterbium Zinc

μg/L μg/L μg/L μg/L μg/L μg/L μg/L

A SD A SD A SD A SD A SD A SD A SD

15515500 03/30/04 < 0.0003 ± 0.0001 0.81 ± 0.03 0.3 ± 0.0 0.010 ± 0.003 0.017 ± 0.000 0.002 ± 0.000 2.4 ± 0.0 15515500 05/28/04 0.0011 ± 0.0000 0.74 ± 0.02 0.6 ± 0.0 0.011 ± 0.001 0.092 ± 0.001 0.009 ± 0.001 0.69 ± 0.16 

15515500 06/10/04 0.0004 ± 0.0002 0.86 ± 0.04 0.5 ± 0.0 0.016 ± 0.003 0.030 ± 0.000 0.003 ± 0.001 < 0.08 ± 0.03 

15515500 06/25/04 < 0.0003 ± 0.0002 0.98 ± 0.02 0.5 ± 0.0 0.020 ± 0.000 0.012 ± 0.001 < 

0 001

± 0.000 0.62 ± 0.04 

15515500 07/23/04 < 0.0003 ± 0.0001 0.79 ± 0.02 0.4 ± 0.0 0.014 ± 0.001 0.0096 ± 0.0001 < 

0 001

± 0.000 0.22 ± 0.02 

15515500 08/26/04 0.0002 ± 0.0001 0.82 ± 0.01 0.37 ± 0.02 0.010 ± 0.000 0.012 ± 0.000 0.001 ± 0.000 0.42 ± 0.04 

15515500 09/22/04 0.0004 ± 0.0001 0.83 ± 0.03 0.52 ± 0.06 0.010 ± 0.001 0.030 ± 0.001 0.003 ± 0.001 1.5 ± 0.0 

15565447 04/07/04 < 0.0003 ± 0.0000 0.82 ± 0.02 < 0.1 ± 0.0 0.003 ± 0.002 0.024 ± 0.001 0.003 ± 0.001 1.9 ± 0.0 

15565447 04/16/04 0.0006 ± 0.0001 0.70 ± 0.01 0.2 ± 0.0 0.004 ± 0.002 0.026 ± 0.000 0.002 ± 0.000 4.1 ± 0.2 

15565447 04/23/04 < 0.0003 ± 0.0001 0.69 ± 0.02 < 0.1 ± 0.1 0.003 ± 0.001 0.026 ± 0.001 0.002 ± 0.000 3.2 ± 0.1 

15565447 04/23/04 0.0004 ± 0.0001 0.58 ± 0.01 < 0.1 ± 0.0 < 0.002 ± 0.001 0.030 ± 0.000 0.002 ± 0.000 3.3 ± 0.0 

15565447 04/23/04 0.0005 ± 0.0002 0.61 ± 0.02 < 0.1 ± 0.0 0.004 ± 0.001 0.029 ± 0.001 0.003 ± 0.000 2.9 ± 0.0 

15565447 05/26/04 0.0050 ± 0.0000 0.46 ± 0.01 0.6 ± 0.1 0.012 ± 0.002 0.37 ± 0.00 0.032 ± 0.001 2.8 ± 0.1 

15565447 06/15/04 0.0017 ± 0.0000 0.49 ± 0.01 0.7 ± 0.0 0.010 ± 0.002 0.16 ± 0.00 0.014 ± 0.001 0.30 ± 0.02 

15565447 07/20/04 < 0.0003 ± 0.0001 0.84 ± 0.03 0.6 ± 0.0 0.015 ± 0.002 0.022 ± 0.001 0.002 ± 0.000 < 0.08 ± 0.02 

15565447 08/18/04 0.0004 ± 0.0000 0.92 ± 0.00 0.6 ± 0.0 0.014 ± 0.002 0.023 ± 0.000 0.002 ± 0.000 < 0.08 ± 0.02 

15565447 09/22/04 0.0004 ± 0.0001 1.0 ± 0.0 0.55 ± 0.01 0.011 ± 0.002 0.036 ± 0.001 0.003 ± 0.001 0.30 ± 0.04 

41
Table 8. Selected dissolved major cations and trace elements from fixed-station sampling sites in the Yukon River Basin—Continued 

Station ID Date Zirconium

μg/L 

A SD

15356000 04/13/04 0.18 ± 0.13 15356000 06/17/04 0.17 ± 0.05 15356000 06/30/04 0.080 ± 0.029 15356000 07/20/04 0.034 ± 0.002 15356000 08/19/04 0.038 ± 0.003 15356000 09/06/04 0.15 ± 0.03 15389000 04/09/04 0.091 ± 0.025 15389000 06/02/04 0.42 ± 0.02 15389000 06/07/04 0.33 ± 0.05 15389000 06/11/04 0.32 ± 0.02 15389000 07/29/04 0.098 ± 0.033 15389000 08/09/04 0.14 ± 0.01 15389000 09/09/04 0.11 ± 0.02 15453500 04/01/04 0.047 ± 0.014 15453500 06/04/04 0.33 ± 0.02 15453500 06/09/04 0.30 ± 0.03 15453500 06/23/04 0.15 ± 0.03 15453500 07/13/04 0.058 ± 0.011 15453500 08/17/04 0.070 ± 0.029 15453500 09/10/04 0.055 ± 0.013 

15515500 03/30/04 0.050 ± 0.002 

15515500 05/28/04 0.13 ± 0.02 

15515500 06/10/04 0.077 ± 0.009 15515500 06/25/04 0.050 ± 0.005 15515500 07/23/04 0.033 ± 0.001 15515500 08/26/04 0.025 ± 0.006 15515500 09/22/04 0.15 ± 0.10 

15565447 04/07/04 0.069 ± 0.015 

15565447 04/16/04 0.067 ± 0.007 15565447 04/23/04 0.069 ± 0.008 15565447 04/23/04 0.070 ± 0.011 15565447 04/23/04 0.066 ± 0.008 15565447 05/26/04 0.34 ± 0.01 

15565447 06/15/04 0.25 ± 0.01 

15565447 07/20/04 0.062 ± 0.016 15565447 08/18/04 0.054 ± 0.007 15565447 09/22/04 0.093 ± 0.018 

42
CHAPTER 5 - Mercury Analyses 

by John F. DeWild and Mark L. Olson 

A description of sample collection and processing of samples for filtered (dissolved), 

methyl, particulate, and total mercury (Hg) is given in Schuster (2003). Sample analysis results 

for WY 2004 are given in table 9. 

 43
Table 9. Mercury and methylmercury concentrations from fixed-station sampling sites in the Yukon 

River Basin 

[Station ID, station identification number, refer to table 1 for description and figure 1 for location; Hg, mercury; ng/L, nanogram per liter; FMHg, 

Filtered methylmercury; FTHg, Filtered total mercury; PMHg, Particulate methylmercury; PTHg, Particulate total mercury; <, less than; *, 

collected by the Equal Discharge Increment method (EDI) and split from a churn sample] 

Station ID Date/Time 

Filtered 

Methyl-Hg 

(FMHg) 

(ng/L) 

Filtered 

Total-Hg 

(FTHg) 

(ng/L) 

Particulate 

Methyl-Hg 

(PMHg) 

(ng/L) 

Particulate 

Total-Hg 

(PTHg) 

(ng/L) 

15389000 4/9/04 14:00 <0.04 0.41 <0.008 0.15 

15389000 6/7/04 15:20 0.06 2.93 0.043 8.81 

15389000 6/7/04 15:20 0.08 2.96 0.043 9.04 

15389000 6/11/04 13:50 0.04 3.79 0.033 6.37 

15389000 7/29/04 14:20 <0.04 0.79 <0.021 0.28 

15389000 9/9/04 13:00 <0.04 0.81 <0.041 0.19 

15515500 3/30/04 17:50 0.05 0.27 <0.017 0.71 

15515500 5/28/04 12:00 <0.04 2.15 <0.081 43.96 

15515500 6/10/04 13:10 <0.04 2.79 <0.071 51.01 

15515500 6/25/04 16:35 <0.04 2.90 0.094 29.33 

15515500 7/23/04 16:10 <0.04 0.18 <0.259 15.02 

15515500 8/26/04 15:30 <0.04 0.34 <0.038 69.66 

15515500 9/22/03 16:00 <0.04 0.50 <0.022 10.50 

15356000 4/13/04 12:30 <0.04 0.57 <0.020 0.49 

15356000 5/26/04 13:00 0.07 4.25 0.109 29.08 

15356000 6/17/04 12:00 <0.04 2.41 <0.040 15.99 

15356000 6/17/04 12:30 <0.04 1.98 <0.041 25.68 

15356000 6/30/04 16:20 <0.04 0.83 <0.100 73.22 

15356000 7/20/04 15:00 <0.04 0.90 <0.119 58.89 

15356000 8/19/04 15:10 <0.04 0.26 <0.088 55.67 

15356000 9/5/04 12:00 <0.04 0.65 <0.038 4.51 

15356000 9/6/04 11:00 <0.04 0.69 <0.035 7.29 

15356000* 9/6/04 11:00 <0.04 0.65 <0.035 9.16 

15565447 4/7/04 10:20 0.04 0.44 <0.017 0.91 

15565447 5/26/04 16:20 0.05 3.79 0.041 10.15 

15565447 6/15/04 15:20 <0.04 3.58 0.061 18.61 

15565447 6/29/04 16:40 0.05 1.62 <0.080 16.20 

15565447 7/20/04 10:30 <0.04 1.18 <0.069 34.87 

15565447 8/18/04 11:10 <0.04 0.54 <0.051 37.04 

15565447 9/22/04 13:00 <0.04 0.62 <0.045 15.78 

15453500 4/1/04 19:00 <0.04 0.31 <0.019 0.36 

15453500 6/4/04 15:20 0.06 4.17 0.128 40.49 

15453500 6/9/04 14:30 <0.04 4.19 0.066 20.31 

15453500 6/23/04 13:00 <0.04 3.36 0.060 15.96 

15453500 7/13/04 14:50 <0.04 1.25 <0.063 14.85 

15453500 8/17/04 16:50 <0.04 1.15 <0.063 19.09 

15453500 9/10/04 15:30 <0.04 26.60 <0.066 10.15 

 44
CHAPTER 6 - Dissolved Gasses and Dissolved Inorganic Carbon 

by Robert G. Striegl and Mark M. Dornblaser 

A description of sample collection and processing of samples for the partial pressures of 

carbon dioxide (ΡCO2) and methane (PCH4 ) is given in Schuster (2003). Sample analysis results for 

WY 2004 are given in table 10. 

 45
Table 10. Carbon dioxide, methane, and dissolved inorganic carbon concentrations from fixedstation sampling sites in the Yukon River Basin

[Station ID, station identification number, refer to table 1 for description and figure 1 for location; CO2, carbon dioxide; μmol/L, micromole per 

liter; PCO2, partial pressure of CO2; μatmos, microatmospheres; CH4, methane; PCH4, partial pressure of CH4 ; DIC, dissolved inorganic carbon; NA, 

not available] 

Station ID Date CO2 

(μmol/L) 

Corrected PCO2

(μatmos) 

CH4 

(μmol/L) 

Corrected PCH4

(μatmos) 

DIC 

(μmol/L) 

15356000 4/13/2004 117.5 1,462 0.11 2.2 2,436 

15356000 6/17/2004 30.3 645 0.09 2.14 1,620 

15356000 6/30/2004 26.8 623 0.07 1.6 1,609 

15356000 7/20/2004 41.1 906 0.07 1.6 1,854 

15356000 8/19/2004 26.6 467 0.15 3.3 1,900 

 15356000 9/5/2004 53.5 981 0.12 2.8 1,834 

15389000 4/9/2004 323.1 4,070 0.16 3.4 4,038 

15389000 6/2/2004 87.9 1,605 0.27 6.2 942 

15389000 6/7/2004 80.3 1,603 0.13 3.0 1,068 

15389000 6/11/2004 38.2 770 0.09 2.2 1,162 

15389000 7/29/2004 46.3 1,071 0.09 2.2 2,631 

15389000 8/9/2004 57.0 961 0.09 1.9 1,484 

15389000 9/9/2004 70.5 1,101 0.15 3.4 2,252 

15453500 4/1/2004 180.9 2,301 0.42 9.0 3,088 

15453500 6/4/2004 30.5 635 0.12 2.7 1,490 

15453500 6/9/2004 24.2 532 0.17 3.9 1,461 

15453500 6/23/2004 43.9 1,116 0.25 5.9 1,741 

15453500 7/13/2004 36.2 851 0.19 4.3 1,770 

15453500 8/17/2004 48.0 1,127 0.26 6.0 1,977 

15453500 9/10/2004 65.7 1,133 0.33 7.2 2,203 

15515500 3/30/2004 252.2 3,198 2.69 57.0 3,402 

15515500 5/28/2004 66.3 1,340 0.46 10.4 1,604 

15515500 6/10/2004 51.6 1,103 0.47 10.7 1,883 

15515500 6/25/2004 24.3 616 0.27 6.4 1,710 

15515500 7/23/2004 51.8 1,116 0.37 8.4 1,640 

15515500 8/26/2004 40.1 755 0.47 10.6 1,738 

15515500 9/22/2004 111.0 1,666 2.87 62.3 2,605 

15565447 4/7/2004 766.1 9,826 3.7 78.5 4,281 

15565447 5/26/2004 70.7 1,269 0.18 3.9 1,323 

15565447 6/15/2004 72.2 1,657 0.26 5.9 1,546 

15565447 6/29/2004 92.6 2,292 0.23 5.4 1,807 

15565447 7/20/2004 NA NA 0.29 6.8 1,886 

15565447 8/18/2004 63.1 1,517 0.27 6.2 1,926 

15565447 9/22/2004 64.9 1,106 0.34 7.5 2,532 

 46
 47

CHAPTER 7 - Sediment Chemistry 

by Arthur J. Horowitz 

A description of sample collection and processing of samples for suspended sediment 

chemistry is given in Schuster (2003). Sample analysis results for WY 2004 are given in table 11. 
Table 11. Sediment chemistry data from fixed-station sampling sites in the Yukon River Basin

[Station ID, station identification number, refer to table 1 for description and figure 1 for location; mg/L, milligram per liter; μg/g; microgram per gram; %, percent; Sets A & B indicate duplicate samples; <, less than] 

Station ID Date/ Time Suspended Sediment (mg/L) Silver (μg/g) Copper (μg/g) Lead (μg/g) Zinc (μg/g) Cadmium (μg/g) 15356000 5/26/2004 13:00 507 <0.5 32 68 210 0.8 15356000 6/17/2004 10:30 336 <0.5 32 60 160 0.5 15356000 6/30/2004 16:20 1,441 <0.5 42 16 110 0.4 15356000 7/20/2004 15:00 1,509 <0.5 42 17 100 0.4 15356000 8/19/2004 15:10 1,271 <0.5 44 9 100 0.4 15356000 9/6/2004 11:00 279 <0.5 39 12 95 0.2 15389000 6/2/2004 16:30 204 <0.5 28 56 220 0.6 15389000 6/7/2004 15:20 141 <0.5 29 28 210 0.5 15389000 6/11/2004 13:50 85 <0.5 34 30 260 0.5 15453500 6/7/2004 15:20 587 <0.5 37 17 200 0.5 15453500 6/9/2004 14:30 379 <0.5 36 16 200 0.5 15453500 6/23/2004 13:00 (Set A) 329 <0.5 34 37 170 0.6 15453500 6/23/2004 13:10 (Set B) 283 <0.5 37 38 180 0.6 15453500 7/13/2004 14:50 637 <0.5 46 18 130 0.6 15453500 8/17/2004 16:50 440 <0.5 48 16 120 0.5 15453500 9/10/2004 15:30 224 <0.5 36 18 110 0.4 15515500 3/30/2004 17:50 11 <1.0 70 59 180 0.4 15515500 5/28/2004 12:00 1,360 <0.5 38 23 140 0.2 15515500 6/10/2004 13:13 1,367 <0.5 45 20 170 0.2 15515500 6/25/2004 16:35 2,956 <0.5 59 26 130 0.4 15515500 7/23/2004 16:10 2,584 <0.5 56 20 110 0.4 15515500 8/26/2004 15:30 2,413 <0.5 54 15 100 0.3 15515500 9/22/2004 16:00 391 <0.5 42 18 95 0.3 15565447 5/26/2004 16:20 314 <0.5 37 55 170 0.3 15565447 6/15/2004 15:20 472 <0.5 34 32 120 0.5 15565447 6/29/2004 16:40 (Set A) 297 <0.5 51 35 140 0.5 15565447 6/29/2004 16:50 (Set B) 293 <0.5 47 23 160 0.5 15565447 7/20/2004 10:30 529 <0.5 61 29 150 0.6 15565447 8/18/2004 11:10 484 0.8 53 16 130 0.6 15565447 9/22/2004 13:00 208 <0.5 57 24 130 0.5 

48
Table 11. Sediment chemistry data from fixed-station sampling sites in the Yukon River Basin—Continued 

Station ID Date/ Time Chromium (μg/g) Cobalt (μg/g) Nickel (μg/g) Barium (μg/g) Vanadium (μg/g) Lithium (μg/g) Beryllium (μg/g) Molybdenum (μg/g) 

15356000 5/26/2004 13:00 98 15 54 1,000 140 25 1.5 3 15356000 6/17/2004 10:30 88 14 53 880 130 22 1.4 3 15356000 6/30/2004 16:20 96 18 58 730 120 25 1.4 2 15356000 7/20/2004 15:00 91 17 55 690 120 22 1.4 2 15356000 8/19/2004 15:10 89 18 53 600 130 22 1.3 2 15356000 9/6/2004 11:00 90 16 53 640 120 20 1.2 3 15389000 6/2/2004 16:30 110 15 56 790 180 61 2.0 3 15389000 6/7/2004 15:20 140 15 82 750 170 61 2.0 9 15389000 6/11/2004 13:50 180 17 99 850 210 65 2.2 10 15453500 6/7/2004 15:20 110 17 62 1,000 160 33 1.7 4 15453500 6/9/2004 14:30 120 16 67 1,000 160 32 1.7 5 15453500 6/23/2004 13:00 (Set A) 95 15 54 870 140 26 1.4 3 15453500 6/23/2004 13:10 (Set B) 98 17 58 950 150 29 1.6 3 15453500 7/13/2004 14:50 100 18 66 800 130 28 1.5 3 15453500 8/17/2004 16:50 95 19 63 680 140 27 1.4 3 15453500 9/10/2004 15:30 90 16 56 720 120 24 1.3 3 15515500 3/30/2004 17:50 150 19 60 1,000 160 24 1.8 3 15515500 5/28/2004 12:00 92 16 51 910 130 25 1.5 2 15515500 6/10/2004 13:13 120 19 66 950 140 29 1.7 4 15515500 6/25/2004 16:35 120 19 64 1,200 140 34 1.9 2 15515500 7/23/2004 16:10 97 18 55 1,100 130 26 1.6 2 15515500 8/26/2004 15:30 88 17 51 880 130 24 1.5 2 15515500 9/22/2004 16:00 84 15 46 770 110 20 1.3 2 15565447 5/26/2004 16:20 110 17 59 870 140 30 1.6 3 15565447 6/15/2004 15:20 100 15 58 980 120 30 1.5 2 15565447 6/29/2004 16:40 (Set A) 170 17 100 1,100 140 33 1.7 9 15565447 6/29/2004 16:50 (Set B) 130 18 78 1,200 150 36 1.8 4 15565447 7/20/2004 10:30 120 22 79 1,100 160 37 1.8 3 15565447 8/18/2004 11:10 99 18 62 890 140 34 1.5 2 15565447 9/22/2004 13:00 100 19 63 900 150 31 1.5 2 

49
Table 11. Sediment chemistry data from fixed-station sampling sites in the Yukon River Basin—Continued 

Station ID Date/ Time Phosphorus (μg/g) Strontium (μg/g) Arsenic (μg/g) Antimony (μg/g) Selenium (μg/g) Mercury (μg/g) Thallium (μg/g) Uranium (μg/g) 

15356000 5/26/2004 13:00 1,000 290 11 2.0 0.7 0.07 <50 <50 15356000 6/17/2004 10:30 850 280 10 1.8 0.5 0.04 <50 <50 15356000 6/30/2004 16:20 1,100 320 12 1.7 0.4 0.03 <50 <50 15356000 7/20/2004 15:00 1,100 330 11 1.6 0.4 0.06 <50 <50 15356000 8/19/2004 15:10 1,000 330 14 1.6 0.4 0.01 <50 <50 15356000 9/6/2004 11:00 890 340 12 1.3 0.4 0.04 <50 <50 15389000 6/2/2004 16:30 930 110 14 1.2 1.5 0.07 <50 <50 15389000 6/7/2004 15:20 930 110 15 1.2 1.0 0.09 <50 <50 15389000 6/11/2004 13:50 1,000 140 14 1.2 1.1 0.10 <50 <50 15453500 6/7/2004 15:20 1,100 280 13 1.7 0.7 0.07 <50 <50 15453500 6/9/2004 14:30 1,100 250 13 1.7 0.8 0.09 <50 <50 15453500 6/23/2004 13:00 (Set A) 920 260 11 1.6 1.0 0.05 <50 <50 15453500 6/23/2004 13:10 (Set B) 1,000 280 11 1.7 1.0 0.06 <50 <50 15453500 7/13/2004 14:50 990 290 13 1.9 0.5 0.13 <50 <50 15453500 8/17/2004 16:50 1,000 310 14 1.7 0.4 0.03 <50 <50 15453500 9/10/2004 15:30 890 310 12 1.4 0.5 0.08 <50 <50 15515500 3/30/2004 17:50 1,500 260 50 2.5 0.9 <0.02 <100 <100 15515500 5/28/2004 12:00 750 220 13 1.7 0.3 0.03 <50 <50 15515500 6/10/2004 13:13 710 220 16 1.9 0.4 0.09 <50 <50 15515500 6/25/2004 16:35 830 220 21 2.5 0.5 0.08 <50 <50 15515500 7/23/2004 16:10 790 240 16 1.7 0.5 0.06 <50 <50 15515500 8/26/2004 15:30 780 270 17 1.5 0.3 0.02 <50 <50 15515500 9/22/2004 16:00 750 250 14 1.2 0.4 <0.01 <50 <50 15565447 5/26/2004 16:20 960 230 13 1.6 0.5 0.10 <50 <50 15565447 6/15/2004 15:20 950 220 12 1.3 0.5 0.10 <50 <50 15565447 6/29/2004 16:40 (Set A) 1,000 240 16 2.0 0.6 0.09 <50 <50 15565447 6/29/2004 16:50 (Set B) 1,100 240 16 1.9 0.6 0.10 <50 <50 15565447 7/20/2004 10:30 1,000 260 18 2.3 0.4 0.07 <50 <50 15565447 8/18/2004 11:10 890 280 21 2.3 0.5 0.05 <50 <50 15565447 9/22/2004 13:00 990 280 19 1.9 0.5 0.19 <50 <50 

50
Table 11. Sediment chemistry data from fixed-station sampling sites in the Yukon River Basin—Continued 

Station ID Date/ Time Iron (%) Manganese (μg/g) Aluminum (%) Titanium (%) Total Organic Carbon (%) Total Carbon (%) Total Nitrogen (%) 

15356000 5/26/2004 13:00 4.0 750 6.6 0.48 1.2 1.5 0.08 15356000 6/17/2004 10:30 3.5 630 5.9 0.40 1.1 2.4 0.11 15356000 6/30/2004 16:20 4.5 810 7.4 0.51 0.4 2.2 0.06 15356000 7/20/2004 15:00 4.4 810 6.9 0.50 0.4 2.3 0.05 15356000 8/19/2004 15:10 4.7 780 6.5 0.48 0.3 2.5 0.04 15356000 9/6/2004 11:00 4.1 750 6.3 0.44 0.6 0.9 0.04 15389000 6/2/2004 16:30 3.9 540 7.0 0.44 3.1 3.5 0.27 15389000 6/7/2004 15:20 4.1 560 7.2 0.45 3.4 3.8 0.27 15389000 6/11/2004 13:50 4.5 610 8.0 0.49 3.6 3.9 0.30 15453500 6/7/2004 15:20 4.5 780 7.3 0.50 1.6 2.7 0.13 15453500 6/9/2004 14:30 4.2 740 7.0 0.48 1.6 2.3 0.13 15453500 6/23/2004 13:00 (Set A) 3.9 700 6.2 0.43 1.5 2.8 0.12 15453500 6/23/2004 13:10 (Set B) 4.3 780 6.8 0.47 1.3 2.5 0.11 

15453500 7/13/2004 14:50 4.6 820 6.8 0.45 0.7 2.7 0.09 15453500 8/17/2004 16:50 4.9 850 7.1 0.48 0.6 2.7 0.06 15453500 9/10/2004 15:30 3.9 730 6.1 0.43 0.9 1.7 0.05 15515500 3/30/2004 17:50 7.4 1,100 7.4 0.45 1.9 2.3 0.20 

15515500 5/28/2004 12:00 4.3 710 7.7 0.45 0.5 0.7 0.05 15515500 6/10/2004 13:13 4.6 780 8.2 0.44 0.5 0.9 0.07 15515500 6/25/2004 16:35 5.0 910 8.8 0.45 0.4 0.6 0.05 15515500 7/23/2004 16:10 4.4 810 8.0 0.43 0.3 0.5 0.05 15515500 8/26/2004 15:30 4.6 770 8.2 0.45 0.2 0.6 0.01 15515500 9/22/2004 16:00 4.0 700 6.8 0.44 0.5 1.2 0.04 15565447 5/26/2004 16:20 4.5 740 7.2 0.49 1.4 1.8 0.12 15565447 6/15/2004 15:20 3.9 760 6.9 0.43 1.3 1.7 0.12 15565447 6/29/2004 16:40 (Set A) 4.5 920 7.3 0.44 1.4 1.8 0.17 15565447 6/29/2004 16:50 (Set B) 5.0 1,000 8.0 0.48 1.4 1.7 0.15 15565447 7/20/2004 10:30 5.5 1,100 8.5 0.49 0.7 1.7 0.11 15565447 8/18/2004 11:10 4.9 870 7.6 0.46 0.7 2.2 0.06 15565447 9/22/2004 13:00 5.2 960 7.6 0.47 1.0 2.2 0.13 

51
CHAPTER 8 - Sediment Mineralogy 

by Dennis D. Eberl 

A description of sample collection and processing of samples for quantitative X-ray 

mineralogical analysis is given in Schuster (2003). Sample analysis results for WY 2004 are given 

in table 12. 

52
Table 12. Sediment mineralogy data from fixed-station sampling sites in the Yukon River Basin 

[Station ID, station identification number, refer to table 1 for description and figure 1 for location; %, percent; *, 

replicate] 

Station ID: 15356000 15356000 15356000 15356000 15356000 15356000 

5/26/04 6/17/04 6/30/04 7/20/04 8/19/04 9/6/04 

Mineral Weight % Weight % Weight % Weight % Weight % Weight % 

Non-clays: 

Quartz 28.2 27.5 14.3 13.0 14.0 17.9 

Ordered Microcline 1.6 1.1 1.0 0.4 1.1 1.7 

Intermediate Microcline 3.4 4.0 4.4 4.2 3.9 3.7 

Sanidine 0.9 0.8 0.0 0.6 0.0 1.2 

Orthoclase 0.0 0.0 0.0 0.0 0.0 0.0 

Anorthoclase 16.3 13.7 15.7 13.8 18.0 16.6 

Albite 5.9 7.3 6.6 6.4 6.4 7.1 

Oligoclase 0.0 1.5 0.3 1.0 0.0 1.0 

Andesine 0.0 0.0 0.0 0.0 0.0 0.0 

Labradorite 6.6 5.9 6.8 8.9 6.7 6.8 

Bytownite 2.2 2.0 2.7 2.2 2.5 3.6 

Anorthite 0.1 1.1 0.8 1.8 0.4 0.5 

Calcite 4.1 6.2 9.8 10.8 11.2 10.1 

Mg-calcite 0.7 0.4 0.7 0.6 0.3 0.3 

Dolomite 2.9 2.9 3.5 3.5 3.6 3.5 

Amphibole 1.1 0.7 0.8 1.8 1.5 1.0 

Pyroxene 0.8 0.3 1.1 1.2 1.5 1.8 

Hematite 0.2 0.3 0.4 0.2 0.3 0.5 

Maghemite 1.4 1.0 0.9 2.5 0.9 0.2 

Apatite 0.4 0.1 0.0 0.6 0.6 0.4 

Total non-clays: 76.7 76.9 69.7 73.5 73.0 77.8 

Clays: 

Goethite 0.3 0.1 0.1 0.1 0.0 0.0 

Disordered Kaolinite 0.1 0.9 1.4 0.5 0.3 0.2 

Ferruginous smectite 8.1 6.9 8.0 7.3 10.2 9.1 

Illite + Smectite 9.4 6.7 6.9 6.6 6.7 5.6 

Chlorite 7.8 7.7 10.8 10.9 11.0 10.1 

Muscovite (2M1) 3.5 4.3 4.0 2.4 1.3 2.0 

Total clays: 29.2 26.7 31.2 27.8 29.5 27.1 

Total: 105.9 103.5 100.9 101.3 102.5 104.9 

Full Pattern degree of fit: 0.084 0.080 0.080 0.109 0.087 0.092 

 

53
Table 12. Sediment mineralogy data from fixed-station sampling sites in the Yukon River Basin—

Continued 

Station ID: 15389000 15389000 

6/2/04 6/7/04 

Mineral Weight % Weight % 

Non-clays: 

Quartz 37.2 36.7 

Ordered Microcline 1.5 1.2 

Intermediate Microcline 2.2 2.3 

Sanidine 0.3 0.2 

Orthoclase 0.0 0.3 

Anorthoclase 1.6 2.0 

Albite 2.8 3.0 

Oligoclase 0.1 0.3 

Andesine 0.0 0.0 

Labradorite 0.0 0.0 

Bytownite 0.0 0.0 

Anorthite 0.8 0.0 

Calcite 0.0 0.0 

Mg-calcite 0.1 0.0 

Dolomite 1.6 1.6 

Amphibole 0.0 0.3 

Pyroxene 0.0 0.0 

Hematite 0.0 0.0 

Maghemite 0.0 0.0 

Apatite 0.6 0.6 

Total non-clays: 48.9 48.6 

Clays: 

Goethite 0.1 0.0 

Disordered Kaolinite 3.7 4.3 

Ferruginous smectite 9.7 9.2 

Illite + Smectite 17.7 19.1 

Chlorite 8.0 8.3 

Muscovite (2M1) 10.0 10.3 

Total clays: 49.3 51.1 

Total: 98.2 99.7 

Full Pattern degree of fit: 0.093 0.095 

 

54
Table 12. Sediment mineralogy data from fixed-station sampling sites in the Yukon River Basin—

Continued 

Station ID: 15453500 15453500 15453500 15453500* 15453500 15453500 

6/7/04 6/9/04 6/23/04 6/23/04 7/13/04 8/17/04 

Mineral Weight % Weight % Weight % Weight % Weight % Weight % 

Non-clays: 

Quartz 29.4 32.5 27.2 26.3 14.9 15.1 

Ordered Microcline 2.3 2.1 1.8 1.0 1.3 0.6 

Intermediate Microcline 2.7 2.8 3.2 4.1 3.9 3.8 

Sanidine 1.0 0.3 1.1 0.6 0.2 0.6 

Orthoclase 0.0 0.0 0.0 0.0 0.0 0.0 

Anorthoclase 14.1 15.7 11.1 11.1 15.0 15.0 

Albite 5.4 5.3 6.7 5.8 5.5 7.2 

Oligoclase 0.2 0.0 0.9 1.1 0.8 0.0 

Andesine 0.0 0.0 0.0 3.9 0.0 0.0 

Labradorite 4.3 2.6 5.3 4.6 5.7 5.8 

Bytownite 1.2 1.6 2.4 0.4 1.5 2.1 

Anorthite 1.8 2.0 0.4 1.1 0.9 0.0 

Calcite 3.5 1.4 4.9 5.1 12.1 11.4 

Mg-calcite 0.0 0.2 0.5 0.5 0.2 0.0 

Dolomite 2.7 2.4 3.0 3.3 3.0 3.3 

Amphibole 1.2 0.5 1.5 1.9 1.3 1.6 

Pyroxene 0.4 0.7 0.3 0.7 0.5 0.8 

Hematite 0.2 0.3 0.2 0.2 0.1 0.3 

Maghemite 0.2 0.0 0.0 0.4 0.7 0.4 

Apatite 0.2 0.2 0.6 0.7 0.0 0.6 

Total non-clays: 70.9 70.4 71.1 72.9 67.5 68.5 

Clays: 

Goethite 0.4 0.2 0.3 0.3 0.3 0.0 

Disordered Kaolinite 2.6 0.7 0.7 0.2 0.9 1.8 

Ferruginous smectite 7.9 10.6 9.2 8.6 10.3 10.6 

Illite + Smectite 0.8 6.5 5.7 7.2 6.1 6.2 

Chlorite 7.5 8.1 8.4 10.4 13.2 12.7 

Muscovite (2M1) 10.8 7.5 5.6 5.1 5.0 4.6 

Total clays: 29.9 33.5 29.9 31.7 35.7 35.9 

Total: 100.8 103.9 101.0 104.6 103.2 104.4 

Full Pattern degree of fit: 0.085 0.092 0.100 0.125 0.087 0.090 

 

55
Table 12. Sediment mineralogy data from fixed-station sampling sites in the Yukon River Basin—

Continued 

Station ID: 15515500 15515500 15515500 15515500 15515500 15515500 

5/28/04 6/10/04 6/25/04 7/23/04 8/26/04 9/22/04 

Mineral Weight % Weight % Weight % Weight % Weight % Weight % 

Non-clays: 

Quartz 34.4 33.9 25.7 26.5 26.6 35.5 

Ordered Microcline 0.8 1.4 1.0 0.7 0.9 0.7 

Intermediate Microcline 2.8 2.3 2.6 3.3 2.6 2.4 

Sanidine 0.0 0.0 0.3 0.3 0.6 0.0 

Orthoclase 0.0 0.0 0.0 0.0 0.0 0.0 

Anorthoclase 5.9 6.0 8.0 8.3 13.1 13.6 

Albite 8.1 7.3 6.2 6.0 5.7 7.7 

Oligoclase 1.2 2.3 0.9 1.4 0.0 0.0 

Andesine 7.1 3.0 2.3 1.1 0.0 1.3 

Labradorite 2.1 3.1 4.3 8.7 7.3 5.0 

Bytownite 1.7 0.3 0.8 1.6 3.2 1.8 

Anorthite 0.6 0.8 1.2 0.7 0.4 1.8 

Calcite 0.3 0.4 0.9 0.6 0.6 0.8 

Mg-calcite 0.6 0.3 0.3 0.3 0.4 0.0 

Dolomite 0.5 0.3 0.4 0.6 0.2 0.2 

Amphibole 1.4 1.1 0.9 1.5 0.4 0.6 

Pyroxene 0.4 0.9 0.2 1.0 0.5 0.7 

Hematite 0.0 0.0 0.1 0.0 0.1 0.2 

Maghemite 0.0 0.4 0.0 0.4 0.1 0.0 

Apatite 0.5 0.4 0.1 0.4 0.0 0.2 

Total non-clays: 68.5 64.1 56.2 63.5 62.8 72.3 

Clays: 

Goethite 0.4 0.4 0.2 0.3 0.2 0.2 

Disordered Kaolinite 0.0 0.4 0.5 0.7 1.3 0.3 

Ferruginous smectite 4.7 5.4 6.2 7.8 8.4 6.8 

Illite + Smectite 0.0 0.0 0.0 0.0 0.0 0.0 

Chlorite 11.3 10.8 13.7 9.7 8.7 9.2 

Muscovite (2M1) 14.2 17.8 23.5 18.1 15.8 12.0 

Total clays: 30.6 34.8 44.1 36.7 34.5 28.4 

Total: 99.1 98.9 100.3 100.3 97.3 100.7 

Full Pattern degree of fit: 0.117 0.098 0.099 0.108 0.090 0.087 

 

56
Table 12. Sediment mineralogy data from fixed-station sampling sites in the Yukon River Basin—

Continued 

Station ID: 15565447 15565447 15565447 15565447* 15565447 15565447 

5/26/04 6/15/04 6/29/04 6/29/04 7/20/04 8/18/04 

Mineral Weight % Weight % Weight % Weight % Weight % Weight % 

Non-clays: 

Quartz 31.5 32.8 25.2 25.8 14.8 16.0 

Ordered Microcline 1.3 0.4 0.2 1.2 1.5 1.2 

Intermediate Microcline 2.9 4.0 4.6 3.5 3.4 3.1 

Sanidine 0.6 1.1 0.6 0.0 0.0 0.0 

Orthoclase 0.0 0.0 0.0 0.0 0.0 0.0 

Anorthoclase 12.6 11.7 9.0 11.1 12.2 11.9 

Albite 5.8 6.6 7.0 6.6 4.7 5.8 

Oligoclase 1.4 1.3 1.2 0.2 0.2 1.7 

Andesine 0.0 0.0 1.1 1.8 0.0 1.1 

Labradorite 4.6 2.8 4.7 1.7 6.7 5.6 

Bytownite 1.4 2.0 0.6 3.0 2.4 0.0 

Anorthite 0.4 0.5 0.3 0.0 0.1 0.5 

Calcite 0.3 0.6 1.1 0.7 6.4 7.7 

Mg-calcite 0.4 0.2 0.0 0.3 0.4 1.0 

Dolomite 1.5 1.3 1.5 1.2 2.0 2.4 

Amphibole 1.2 1.0 1.2 1.2 1.4 1.5 

Pyroxene 0.0 0.7 0.6 0.8 0.7 0.1 

Hematite 0.1 0.0 0.2 0.1 0.1 0.1 

Maghemite 0.0 0.0 0.0 0.0 0.0 0.7 

Apatite 0.2 0.9 0.8 0.6 0.6 0.9 

Total non-clays: 66.0 67.9 60.2 60.0 57.8 61.2 

Clays: 

Goethite 0.3 0.4 0.3 0.6 0.4 0.5 

Disordered Kaolinite 1.6 1.1 0.2 1.1 0.7 0.1 

Ferruginous smectite 8.0 7.1 5.6 8.0 8.6 8.3 

Illite + Smectite 4.3 6.3 9.4 6.9 6.3 7.1 

Chlorite 9.3 10.8 13.5 12.1 14.5 13.6 

Muscovite (2M1) 10.9 9.7 11.8 11.0 13.8 12.0 

Total clays: 34.4 35.4 40.8 39.6 44.3 41.5 

Total: 100.4 103.3 100.9 99.6 102.1 102.7 

Full Pattern degree of fit: 0.085 0.115 0.111 0.096 0.086 0.103 

 

57
CHAPTER 9 - Sediment Concentration and Percent Organic Matter (OM) 

by Paul F. Schuster and Michael M. Reddy 

A description of sample collection and processing of samples for suspended sediment 

concentration and percent OM in the sediment is given in Schuster (2003). Sample analysis results 

for WY 2004 are given in table 13. 

58
Table 13. Suspended sediment concentrations and percent organic matter in sediment from fixedstation sampling sites in the Yukon River Basin

[Station ID, station identification number, refer to table 1 for description and figure 1 for location; mg/L, milligram per 

liter; OM, Organic Matter; NA, not available; <, less than] 

Station ID Date 

Sediment 

concentration

(mg/L) 

Percent 

OM in 

sediment 

15356000 4/13/2004 <1 NA 

15356000 5/26/2004 343 7 

15356000 6/17/2004 137 8 

15356000 6/30/2004 1,054 6 

15356000 8/19/2004 709 10 

15389000 4/9/2004 <1 NA 

15389000 6/2/2004 145 11 

15389000 7/29/2004 1 100 

15389000 8/9/2004 25 21 

15453500 4/1/2004 2 68 

15453500 6/4/2004 417 8 

15453500 7/13/2004 441 7 

15453500 8/17/2004 389 9 

15453500 9/10/2004 100 14 

15515500 3/30/2004 4 37 

15515500 5/28/2004 623 6 

15515500 7/23/2004 1,578 4 

15515500 8/26/2004 1,386 5 

15515500 9/22/2004 125 9 

15565447 4/7/2004 3 68 

15565447 5/26/2004 251 9 

15565447 6/15/2004 300 7 

15565447 6/29/2004 197 7 

15565447 7/20/2004 383 7 

15565447 8/18/2004 398 8 

15565447 9/22/2004 178 9 

59
CHAPTER 10 – Total Particulate Carbon (TPC), Particulate Inorganic Carbon 

(PIC), Particulate Organic Carbon (POC), and Total Particulate Nitrogen 

(TPN) 

by Paul F. Schuster and Michael M. Reddy 

A description of sample collection and processing of samples for TPC and TPN, 

concentrations, also referred to as PC and PN, respectively, is given in Schuster (2003). Duplicate 

samples are required for the determination of PIC and POC. The first duplicate was analyzed for 

TPC (Zimmerman and others, 1997). The second duplicate was combusted at 500° C to drive off all 

the POC. The second duplicate was then analyzed for PIC (Zimmerman and others, 1997). 

Particulate organic carbon (POC) was determined by the difference of TPC and PIC. Sample 

analysis results for WY 2004 are given in table 14. 

60
Table 14. Total particulate carbon, particulate inorganic carbon, particulate organic carbon, and total 

particulate nitrogen concentrations from fixed-station sampling sites in the Yukon River Basin 

[Station ID, station identification number, refer to table 1 for description and figure 1 for location; TPC, total particulate 

carbon; PIC, particulate inorganic carbon; POC, particulate organic carbon; TPN, total particulate nitrogen; mg/L, 

milligram per liter; NA, not available; concentrations averaged from duplicate samples] 

Station ID Date TPC 

(mg/L) 

PIC 

(mg/L) 

POC 

(mg/L) 

TPN 

(mg/L) 

15356000 5/26/2004 10.50 2.69 7.81 0.46 

15356000 6/17/2004 3.88 1.00 2.88 0.14 

15356000 6/30/2004 33.90 23.00 10.90 0.58 

15356000 9/6/2004 6.21 2.20 4.01 0.13 

15356000 8/19/2004 27.60 18.90 8.70 0.50 

15389000 6/2/2004 7.07 0.15 6.92 0.54 

15389000 7/29/2004 0.55 0.01 0.54 0.06 

15389000 8/9/2004 1.93 0.01 1.92 0.14 

15389000 9/9/2004 0.27 0.00 0.27 NA 

15453500 6/4/2004 21.30 4.55 16.75 1.00 

15453500 7/13/2004 13.80 7.55 6.25 0.33 

15453500 8/17/2004 12.70 4.54 8.16 0.33 

15453500 9/10/2004 4.60 0.30 4.30 0.16 

15515500 3/30/2004 NA NA NA 0.02 

15515500 5/28/2004 10.90 0.79 10.11 0.54 

15515500 7/23/2004 15.40 2.72 12.68 0.74 

15515500 8/26/2004 13.40 2.07 11.33 0.69 

15515500 9/22/2004 1.95 0.16 1.79 0.11 

15565447 5/26/2004 6.71 0.24 6.47 0.45 

15565447 6/15/2004 6.23 0.22 6.01 0.37 

15565447 6/29/2004 3.74 0.21 3.54 0.22 

15565447 7/20/2004 8.26 3.12 5.14 0.30 

15565447 8/18/2004 14.00 2.64 11.36 0.45 

15565447 9/22/2004 4.75 0.40 4.35 0.20 

61
CHAPTER 11 - Isotopic Analysis of Suspended Particulate Organic Matter 

(POM) 

by Steven R. Silva and Carol Kendall 

A description of sample collection and processing of samples for the percent of carbon and 

nitrogen, carbon:nitrogen ratios, carbon-13, and nitrogen-15 isotopes in suspended POM is given in 

Schuster (2003). Sample analysis results for WY 2004 are given in table 15. 

62
Table 15. Suspended sediment isotopic data from fixed-station sampling sites in the Yukon River 

Basin 

[Station ID, station identification number, refer to table 1 for description and figure 1 for location; C, carbon; N, 

nitrogen; SD, standard deviation; Avg, average; %, percent; δ, delta; --, no data; *, replicate] 

Station ID Date %C SD %C %N SD %N C:N δ

13C SD 

δ

13C δ

15N SD 

δ

15N 

15356000 5/26/2004 1.16 -- 0.09 -- 15.04 -26.24 -- 2.11 -- 

15356000 5/26/2004* 1.01 0.11 0.08 0.01 14.73 -26.06 0.13 2.27 0.11 

15356000 6/17/2004 0.97 -- 0.10 -- 11.32 -25.16 -- 4.95 -- 

15356000 6/30/2004 0.51 -- 0.04 -- 14.88 -24.36 -- 2.19 -- 

15356000 7/20/2004 0.45 -- 0.04 -- 13.13 -24.19 -- 4.77 -- 

15565447 6/15/2004 1.43 -- 0.10 -- 16.68 -26.73 -- 3.05 -- 

15565447 6/26/2004 1.5 -- 0.13 -- 13.46 -26.57 -- 4.10 -- 

15565447 6/29/2004 1.64 -- 0.18 -- 10.63 -25.96 -- 5.03 -- 

15565447 6/29/2004* 1.39 0.18 0.13 0.04 12.47 -26.34 0.27 4.66 0.26 

15565447 7/20/2004 0.85 -- 0.09 -- 11.02 -25.58 -- 6.15 -- 

15565447 7/20/2004* 0.86 0.01 0.09 0.00 11.15 -25.80 0.16 6.29 0.10 

15453500 6/7/2004 1.75 -- 0.13 -- 15.71 -26.27 -- 2.64 -- 

15453500 6/9/2004 1.66 -- 0.16 -- 12.10 -25.30 -- 3.95 -- 

15453500 6/23/2004 1.45 -- 0.10 -- 16.92 -26.39 -- 2.65 -- 

15453500 6/23/2004* 1.43 0.01 0.10 0.00 16.68 -26.19 0.14 2.48 0.12 

15453500 7/13/2004 0.9 -- 0.07 -- 15.00 -25.60 -- 1.90 -- 

15515500 3/30/2004 4.44 -- 0.21 -- 24.67 -27.40 -- 3.52 -- 

15515500 5/28/2004 0.47 -- 0.04 -- 13.71 -25.68 -- 0.06 -- 

15515500 6/10/2004 0.52 -- 0.05 -- 12.13 -24.44 -- 4.34 -- 

15515500 6/25/2004 0.39 -- 0.03 -- 15.17 -24.23 -- 2.07 -- 

15515500 7/23/2004 0.38 -- 0.04 -- 11.08 -24.81 -- 2.32 -- 

15389000 6/2/2004 3.4 -- 0.25 -- 15.87 -26.84 -- 4.18 -- 

15389000 6/7/2004 3.56 -- 0.26 -- 15.97 -27.06 -- 3.14 -- 

15389000 6/11/2004 3.7 -- 0.28 -- 15.42 -26.64 -- 3.95 -- 

63
CHAPTER 12 - Uranium Isotopes 

by Thomas F. Kraemer 

A description of sample collection and processing of samples for uranium concentrations and 

activity ratios (UAR) is given in Schuster (2003). Sample analysis results for WY 2004 are given in 

table 16. 

64
Table 16. Uranium concentration and 234U/238U isotopic activity ratio analyses in water samples from 

fixed-station sampling sites in the Yukon River Basin

[Station ID, station identification number, refer to table 1 for description and figure 1 for location; μg/L; microgram per 

liter; U, Uranium; -- not available] 

Station ID Date and time U 234U/238U activity ratio 

(μg/L) (±1 sigma uncertainty) 

15389000 4/9/04 14:00 0.82 2.310±0.015 

15389000 6/2/04 16:20 0.20 1.649±0.008 

15389000 6/8/04 - - 0.25 1.714±0.013 

15389000 6/11/04 13:50 0.24 1.941±0.019 

15389000 7/29/04 14:00 0.63 2.093±0.006 

15389000 7/29/04 14:20 0.22 1.935±0.009 

15389000 7/29/04 14:20 0.43 2.135±0.008 

15515500 3/30/04 17:50 0.82 1.310±0.008 

15515500 5/28/04 12:00 0.75 1.149±0.006 

15515500 6/10/04 13:10 0.90 1.105±0.007 

15515500 6/25/04 16:35 1.16 1.102±0.010 

15515500 6/25/04 16:35 1.16 1.102±0.006 

15515500 7/23/04 16:10 0.69 1.119±0.007 

15515500 8/26/04 15:30 0.73 1.125±0.007 

15515500 9/22/04 16:00 0.74 1.300±0.009 

15356000 4/3/04 12:30 1.13 1.417±0.007 

15356000 4/3/04 12:30 - - 1.405±0.007 

15356000 5/26/04 11:00 0.65 1.458±0.006 

15356000 6/17/04 10:30 0.89 1.376±0.008 

15356000 6/30/04 16:20 0.93 1.410±0.011 

15356000 6/30/04 16:20 - - 1.403±0.008 

15356000 7/20/04 15:00 0.99 1.380±0.010 

15356000 7/20/04 15:00 - - 1.388±0.006 

15356000 8/19/04 15:10 0.81 1.375±0.006 

15356000 9/6/04 - - 1.06 1.362±0.005 

15565447 4/7/04 10:20 0.89 1.423±0.010 

15565447 5/26/04 16:20 0.53 1.385±0.006 

15565447 6/15/04 15:20 0.56 1.432±0.014 

15565447 6/29/04 16:40 0.66 1.387±0.005 

15565447 7/20/04 10:30 0.95 1.339±0.014 

15565447 8/18/04 11:10 0.99 1.346±0.010 

15565447 9/22/04 13:00 1.09 1.365±0.005 

15453500 4/1/04 19:00 1.04 1.425±0.006 

15453500 6/4/04 16:20 0.64 1.459±0.004 

15453500 6/9/04 14:30 0.60 1.443±0.009 

15453500 6/23/04 13:00 0.88 1.418±0.006 

15453500 6/23/04 13:00 - - 1.395±0.006 

15453500 6/23/04 13:10 0.88 1.400±0.009 

15453500 7/13/04 14:50 1.03 1.410±0.007 

15453500 8/17/04 16:50 0.77 1.414±0.009 

15453500 9/10/04 15:30 0.86 1.408±0.005 

65
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67