Water and Sediment Quality in the Yukon River Basin, 

Alaska, During Water Year 2005 

Open-File Report 2007-1037 

U.S. Department of the Interior 

U.S. Geological Survey 
Cover photograph: U.S. Geological Survey scientists measuring discharge at the mouth 

of the Forty-mile River in Yukon Territories, Canada, August 2004 
Water and Sediment Quality in the Yukon River Basin, 

Alaska, During Water Year 2005 

Edited By Paul F. Schuster 

Open-File Report 2007-1037 

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. Myers, Director 

U.S. Geological Survey, Boulder, Colorado 2007 

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ii
Contents 

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

Acknowledgments .................................................................................................................................................vii

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

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

CHAPTER 3 - Dissolved Organic Carbon Characterization.............................................................................22

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

CHAPTER 5 - Mercury Analyses..........................................................................................................................42

CHAPTER 6 - Dissolved Gasses and Dissolved Inorganic Carbon................................................................44

CHAPTER 7- Sediment Chemistry........................................................................................................................46

CHAPTER 8 - Sediment Mineralogy ....................................................................................................................51

CHAPTER 9 - Sediment Concentration and Percent Organic Matter ..........................................................56

CHAPTER 10 - Total Particulate Carbon, Particulate Inorganic Carbon Particulate Organic Carbon, 

and Total Particulate Nitrogen ..................................................................................................58

CHAPTER 11 - Isotopic Analysis of Suspended Particulate Organic matter...............................................60

CHAPTER 12 - Uranium Isotopes.........................................................................................................................62

References Cited....................................................................................................................................................64

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 ..................................................................................................................................................................43 

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

sampling sites in the Yukon River Basin ......................................................................................................45 

11. Sediment chemistry data from fixed-station sampling sites in the Yukon River Basin ......................47 

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

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

sampling sites in the Yukon River Basin ......................................................................................................57 

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....59 

15. Suspended sediment isotopic data from fixed-station sampling sites in the Yukon River Basin......61 

16. Uranium concentration and 234U/238U isotopic activity ratio analyses in water samples from fixedstation sampling sites in the Yukon River Basin ........................................................................................63 

iv
Conversion Factors 

_________________________________________________________ _ __ 

Multiply by To obtain 

 Length

nanometer (nm) 3.937 x10-8 inch (in.) 

micrometer (μm) 3.937 x10-5 inch (in.) 

millimeter (mm) 3.937 x10-2 inch (in.) 

centimeter (cm) 3.937 x10-1 inch (in.) 

meter (m) 3.281 foot (ft) 

 Area

square kilometer (km2) 3.861 x10-1 square mile (mi2) 

 Flow

cubic meter per second (m3

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

 Volume

microliter (μL) 3.382 x10-5 ounce, fluid (oz) 

milliliter (mL) 3.382 x10-2 ounce, fluid (oz) 

liter (L) 2.642 x10-1 gallon (gal) 

 Mass

microgram (μg) 3.527 x10-8 ounce, avoirdupois (oz) 

milligram (mg) 3.527 x10-5 ounce, avoirdupois (oz) 

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) 

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

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

ends. 

 

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 2005 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. 

This is the final report in a series of five USGS Open-File Reports spanning five WYs, from 

October 2000 through September 2005. The previous four reports are listed in the references 

(Schuster, 2003, 2005a, 2005b, 2006). All five reports are also available on the World Wide Web: 

WY 2001 http://pubs.usgs.gov/of/2003/ofr03427/

WY 2002 http://pubs.usgs.gov/of/2005/1199/

WY 2003 http://pubs.usgs.gov/of/2005/1397/

WY 2004 http://pubs.usgs.gov/of/2006/1258/

WY 2005 http://pubs.usgs.gov/of/2007/1037/

Water-quality and sediment-quality data from samples collected on the Yukon River and selected 

major tributaries in Alaska for synoptic studies during WYs 2002–03 are published in Dornblaser 

and Halm (2006) and also are available at: http://pubs.usgs.gov/of/2006/1228/. 

vi
Acknowledgments 

The USGS National 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 USGS Field office in Fairbanks. Without their field expertise and continuous 

logistical support this work would not have been possible. 

As the coordinator for the USGS Yukon River Basin studies and editor of all five data 

reports, I would like to acknowledge each individual who participated in some capacity during these 

5 years. The collective insight, help, and dedication of these individuals created a unique, 

productive, successful, and fun work environment. The extensive list includes personnel and 

volunteers from the USGS, Canadian government, universities, public schools, indigenous tribal 

councils, advocacy groups, and village communities. 

 George Aiken, Ron Antweiler, Bernie Austin, Marilyn Austin, Bill Barber, Heather Best 

 John Borg, Tim Brabets, Christian Breen, Kenna Butler, Leon Caroll, Mark Carr, Veronica 

Carrasco, Mark Castor, Ken Coe, Charlie Couvillion, Steve Darnell, Ryan Davis, Teri Dennison, 

 Jim DeRose, John DeWild, Dan Doctor, Mark Dornblaser, Dennis Eberl, Luke Eberl, Melanie 

Estep, Dennis Evans, Jacques Finlay, Brian Forsyth, Zan Frederick, Doug Halm, Terry 

Hanlon, Wade Hanna, Bob Hirsch, Rick Hooper, Art Horowitz, Randy Host, Marlys House, Erica 

Keefe, Carol Kendall, Ben Kennedy, Jay Klinck, Rich Kopish, Dave Krabbenhoft, Tom 

Kraemer, Rebecca Kyle, Dusty Langley, Pat LaTour, Russ Livingston, Dan Long, Pat Maltais, Bev 

McNaughton, Bob Michel, Ed Neal, Gordie Nelson, Brian Neubert, Mark Olson, Shane Olund, Bob 

Ourso, Scott Palfreyman, Mike Parker, John Pearce, Francis Peters, Terry Plowman, Pete 

Raymond, Mike Reddy, Dennis Rosenkranz, Dave Roth, Andrea Ryan, Tom Sabin, Jenny 

vii
Schnackel, Matt Schellekens, Dick Schnieder, Joy Schockley, Brad Sether, Alan Shiller, Sharon 

Shoup, Steve Silva, Kent Slaughter, Gary Solin, Jay Stevens, Rob Striegl, Zach Swensen, Howard 

Taylor, Blair Thorson, Bob Truelson, Nick Turner, Jean Turner, Pete Van Metre, Pete Van 

Erp, Mary Voytek, Michelle Walvoord, Kim Wickland, Kathy Wood, and the entire grades 6 to 12 

of Eagle Public School. 

viii
CHAPTER 1 - Introduction 

by Paul F. Schuster 

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

(NASQAN) has completed a 5-year (2001–05) 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 changes 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 were made on 

the upper, middle, and lower Yukon River and on the Tanana and Porcupine Rivers (Schuster, 2003, 

2005a, 2005b, 2006). 

A thorough description of the basin is given in Brabets and others (2000). 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, 2003, and 2004 are given in Schuster (2005a, 2005b, 2006), 

respectively. A broad range of constituents were measured in fixed-station samples during the 5-year 

study, including major ions, nutrients, dissolved and sediment-associated 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 extensive 

wetlands in the basin, the Yukon River exhibits high organic carbon concentrations in contrast to 

other large rivers. Both the chemical composition and concentration of organic carbon are expected 

1
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, Canada, to 

Pilot Station, Alaska, during high flow in early June and low flow in late August were completed 

during the years 2002–04. 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-quality and sediment-quality 

data collected during WY 2005. 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. This report, the fifth and final 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 

This section provides a summary of the Yukon River Basin fixed-station sampling 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 2005 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, USGS station identification number, stream flow 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 

[Station ID, station identification number, refer to table 1 for description and figure 1 for location; ft3/s , cubic feet per second; mg/L, milligram per liter; NTU, Nephelometric turbidity unit; Hg, mercury; <, less 

than detection limit; --, missing value; mm, millimeter; lab, laboratory; fld, field; μS/cm, microsiemen per centimeter at 25 degrees Celsius; cm, centimeter; °C, degrees 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; 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 4/7/05 17:40 19,200 146 2.5 735 10.8 7.6 7.7 15356000 5/11/05 10:30 142,000 136 77 747 11.2 7.9 E7.5 15356000 5/24/05 12:00 300,000 126 180 752 10.6 7.9 8.0 15356000 6/14/05 12:20 240,000 119 100 736 9.5 7.9 8.0 15356000 7/7/05 11:00 220,000 138 390 -- 9.8 8.0 8.1 15356000 8/4/05 10:40 163,000 142 140 736 9.7 8.1 8.1 15356000 8/30/05 11:00 127,000 154 240 735 9.7 8.2 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 4/7/05 17:40 244 256 1.5 0.0 0.032 0.023 35.6 9.42 15356000 5/11/05 10:30 170 172 -- 8.1 0.463 0.347 24.0 6.85 15356000 5/24/05 12:00 171 179 -- 9.3 0.251 0.188 23.7 7.02 15356000 6/14/05 12:20 197 213 18.0 14.5 0.098 0.071 28.3 8.21 15356000 7/7/05 11:00 192 197 -- 14.7 0.233 0.173 28.3 7.66 

15356000 8/4/05 10:40 213 216 -- 13.4 0.193 0.142 29.9 7.70 15356000 8/30/05 11:00 236 236 -- 11.5 0.090 0.065 31.8 8.48 

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) 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 4/7/05 17:40 1.16 2.97 100 96 117 0 15356000 5/11/05 10:30 1.19 1.95 60 60 78 0 15356000 5/24/05 12:00 0.96 1.75 62 60 73 0 15356000 6/14/05 12:20 0.81 1.85 74 69 84 0 15356000 7/7/05 11:00 1.43 2.41 73 66 80 0 15356000 8/4/05 10:40 1.30 2.88 76 74 90 0 15356000 8/30/05 11:00 1.49 2.81 83 80 98 0 

Nitrogen, Ammonia + 

Organic Total 

(mg/L) 

15356000 4/7/05 17:40 0.54 0.1 7.06 31.9 E0.006 E0.06 E0.05 15356000 5/11/05 10:30 0.49 E0.1 5.49 25.1 <0.010 0.37 0.64 

15356000 5/24/05 12:00 0.27 E0.1 5.90 25.9 <0.010 0.25 0.68 

15356000 6/14/05 12:20 0.26 0.1 6.18 33.7 <0.010 E0.10 0.23 

15356000 7/7/05 11:00 0.54 0.1 6.97 30.5 E0.005 0.21 0.73 

15356000 8/4/05 10:40 0.41 0.1 7.23 32.9 <0.010 0.18 0.40 15356000 8/30/05 11:00 0.48 0.1 6.34 37.8 <0.010 0.11 0.23 

Station ID Date/Time 

Nitrogen, NO2+ 

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, Inorganic + 

Organic Particulate 

Total (mg/L) 

15356000 4/7/05 17:40 0.081 E0.001 <0.02 <0.004 <0.006 0.004 0.2 15356000 5/11/05 10:30 0.056 0.002 0.23 0.009 <0.006 0.46 3.3 15356000 5/24/05 12:00 0.046 <0.002 0.32 E0.003 <0.006 0.80 5.9 

15356000 6/14/05 12:20 0.039 <0.002 0.07 <0.004 <0.006 0.31 2.5 15356000 7/7/05 11:00 0.075 E0.001 0.32 0.004 <0.006 0.90 13.4 

15356000 8/4/05 10:40 0.050 E0.001 0.22 E0.003 <0.006 0.40 4.8 

15356000 8/30/05 11:00 0.032 E0.001 0.09 E0.003 <0.006 0.34 3.6 

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

Station ID Date/Time Carbon, Inorganic Particulate 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 4/7/05 17:40 <0.1 1.3 0.2 E1 E0.11 0.4 52 15356000 5/11/05 10:30 0.6 11.9 2.7 40 E0.15 0.5 41 15356000 5/24/05 12:00 0.8 6.7 5.1 39 E0.19 0.6 38 15356000 6/14/05 12:20 0.6 3.2 2.0 26 E0.16 0.5 41 15356000 7/7/05 11:00 6.9 6.8 6.5 28 E0.19 0.7 36 15356000 8/4/05 10:40 1.4 5.4 3.4 29 E0.18 0.6 38 15356000 8/30/05 11:00 1.6 3.3 2.0 23 0.21 0.6 36 

Manganese

(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) 

15356000 4/7/05 17:40 <0.06 E6 E0.04 <0.8 0.089 1.1 E4 <0.08 1.9 1.2 15356000 5/11/05 10:30 <0.06 E5 0.05 <0.8 0.139 3.1 104 E0.08 1.7 13.9 15356000 5/24/05 12:00 <0.06 E5 E0.03 <0.8 0.204 2.7 60 E0.06 2.2 7.2 15356000 6/14/05 12:20 <0.06 <8 <0.04 <0.8 0.068 1.9 17 0.18 2.8 2.2 15356000 7/7/05 11:00 <0.06 10 <0.04 <0.8 0.096 2.9 28 <0.08 2.7 2.0 15356000 8/4/05 10:40 <0.06 14 <0.04 <0.8 0.119 2.2 23 <0.08 2.4 3.6 15356000 8/30/05 11:00 <0.06 13 <0.04 0.10 0.089 4.3 13 E0.05 3.1 1.6 

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) Sediment, Susp. (mg/L)

15356000 4/7/05 17:40 1.3 1.86 0.5 <0.2 179 0.4 1.5 1.08 23 27 15356000 5/11/05 10:30 0.7 2.79 0.5 <0.2 121 0.5 4.8 0.75 49 424 15356000 5/24/05 12:00 0.8 3.42 0.6 <0.2 118 0.5 1.0 0.63 60 933 15356000 6/14/05 12:20 0.9 2.37 0.6 <0.2 129 0.4 0.7 0.69 57 311 15356000 7/7/05 11:00 1.2 2.47 0.5 <0.2 132 0.8 0.9 0.78 83 1,240 15356000 8/4/05 10:40 1.2 1.80 0.4 <0.2 146 0.6 E0.4 0.81 69 378 15356000 8/30/05 11:00 1.5 2.37 0.6 <0.2 155 0.5 1.2 0.86 75 400 

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; mg/L, milligram per liter; NTU, Nephelometric turbidity unit; Hg, mercury; <, less 

than detection limit; --, missing value; mm, millimeter; lab, laboratory; fld, field; S/cm, microsiemen per centimeter at 25 degrees Celsius; cm, centimeter; °C, degrees Celsius; UV, Ultraviolet; nm, nanometer; 

Flt, filtered; NO2, nitrite; NO3, nitrate; wat flt susp., water filtered suspended; g/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; 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 4/6/05 15:40 830 234 <2.0 748 4.6 7.4 7.7 15389000 5/19/05 13:00 92,600 99 99 747 11.2 7.4 7.7 15389000 5/25/05 15:10 51,300 105 88 -- 11.3 7.7 7.6 15389000 6/7/05 17:00 40,100 97 40 -- 9.2 7.6 7.7 15389000 7/14/05 14:30 16,400 163 17 755 9.2 7.8 8.1 15389000 8/3/05 13:30 4,770 168 2.2 -- 9.6 8.0 8.1 15389000 8/26/05 13:00 4,520 168 <2.0 753 11.2 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) 

15389000 4/6/05 15:40 384 403 -2.2 0.0 0.040 0.029 62.4 14.1 15389000 5/19/05 13:00 101 100 -- 6.1 0.653 0.494 15.5 2.80 15389000 5/25/05 15:10 120 126 -- 7.5 0.544 0.408 18.7 3.45 15389000 6/7/05 17:00 132 132 23.8 11.9 0.534 0.397 20.4 4.45 15389000 7/14/05 14:30 261 261 -- 15.3 0.187 0.137 39.8 8.35 15389000 8/3/05 13:30 265 263 17.0 12.8 0.173 0.122 38.6 8.42 15389000 8/26/05 13:00 264 257 15.3 11.5 0.238 0.170 22.8 5.32 

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 4/6/05 15:40 5.07 0.1 4.69 34.4 <0.010 <0.10 <0.10 15389000 5/19/05 13:00 0.61 E0.1 2.20 11.0 E0.005 0.47 0.83 15389000 5/25/05 15:10 0.68 E0.1 2.50 12.8 E0.005 0.66 0.86 15389000 6/7/05 17:00 0.86 E0.1 3.14 16.9 <0.010 0.42 0.56 15389000 7/14/05 14:30 2.18 E0.1 2.84 40.9 <0.010 0.22 0.33 15389000 8/3/05 13:30 1.67 0.1 2.87 43.1 <0.010 0.20 0.22 15389000 8/26/05 13:00 1.78 E0.1 1.56 43.4 <0.010 0.24 0.27 

Carbonate, Dis IT 

Field (mg/L) 

15389000 4/6/05 15:40 0.67 5.69 175 173 209 0.0 15389000 5/19/05 13:00 0.97 1.20 38 34 41 0.0 15389000 5/25/05 15:10 1.02 1.32 45 48 59 0.0 15389000 6/7/05 17:00 0.71 1.81 50 51 62 0.0 15389000 7/14/05 14:30 0.70 4.23 90 80 104 0.0 15389000 8/3/05 13:30 0.67 3.55 89 90 110 0.0 15389000 8/26/05 13:00 0.36 2.70 87 84 102 0.0 

Station ID Date/Time 

Nitrogen, NO2+ 

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, Inorganic + 

Organic Particulate 

Total (mg/L) 

15389000 4/6/05 15:40 0.205 <0.002 <0.02 E0.003 <0.006 0.004 <0.1 15389000 5/19/05 13:00 0.026 E0.001 0.32 0.015 <0.006 0.154 4.1 

15389000 5/25/05 15:10 0.049 0.003 0.37 0.013 <0.006 0.169 4.3 

15389000 6/7/05 17:00 0.034 E0.001 0.13 0.011 <0.006 0.081 1.8 15389000 7/14/05 14:30 <0.016 E0.001 0.16 E0.003 <0.006 0.041 3.0 15389000 8/3/05 13:30 E0.008 E0.001 0.04 E0.003 <0.006 0.006 0.3 15389000 8/26/05 13:00 E0.009 E0.001 <0.02 E0.003 <0.006 0.006 0.2 

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

Station ID Date/Time 

Carbon, Inorganic 

Particulate 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 4/6/05 15:40 <0.06 13 <0.04 <0.8 0.173 0.9 7 <0.08 8.5 16.0 15389000 5/19/05 13:00 <0.06 8 E0.03 <0.8 0.304 3.7 302 <0.08 2.6 17.3 15389000 5/25/05 15:10 <0.06 E4 <0.04 E0.8 0.259 3.3 220 0.12 2.4 6.8 15389000 6/7/05 17:00 E0.05 E6 <0.04 E0.6 0.135 2.5 224 0.11 3.2 4.0 15389000 7/14/05 14:30 <0.06 E7 <0.04 <0.8 0.111 1.4 29 <0.08 5.8 1.3 15389000 8/3/05 13:30 <0.06 13 <0.04 <0.8 0.093 1.5 16 <0.08 5.3 2.2 15389000 8/26/05 13:00 E0.03 E5 0.05 <0.8 0.105 8.4 20 0.27 3.4 4.2 

Barium 

(μg/L) 

15389000 4/6/05 15:40 <0.1 1.3 <0.1 2 <0.2 0.2 102 15389000 5/19/05 13:00 0.2 17.5 3.9 69 <0.2 0.4 33 

15389000 5/25/05 15:10 0.1 15.2 4.2 40 <0.2 0.4 42 

15389000 6/7/05 17:00 <0.1 14.3 1.7 39 <0.2 0.4 43 15389000 7/14/05 14:30 <0.1 6.2 3.0 11 <0.2 0.4 68 15389000 8/3/05 13:30 <0.1 5.8 0.3 10 <0.2 0.3 58 15389000 8/26/05 13:00 <0.1 7.6 0.2 12 <0.2 E0.2 44 

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) Sediment, Susp. (mg/L) 

15389000 4/6/05 15:40 0.7 4.60 0.4 <0.2 187 0.3 1.3 0.82 76 13 15389000 5/19/05 13:00 <0.4 3.61 E0.2 <0.2 44.3 0.4 6.6 0.26 98 178 15389000 5/25/05 15:10 E0.3 3.74 E0.3 <0.2 42.9 0.5 1.1 0.25 95 158 15389000 6/7/05 17:00 E0.3 3.15 E0.3 <0.2 65.8 0.5 0.8 0.21 94 69 15389000 7/14/05 14:30 0.5 2.29 E0.3 <0.2 135 0.2 0.7 0.46 96 34 

15389000 8/3/05 13:30 0.5 2.32 E0.3 <0.2 135 0.3 E0.5 0.40 81 1 15389000 8/26/05 13:00 E0.3 2.12 <0.4 <0.2 80.5 0.2 16 0.19 87 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; mg/L, milligram per liter; NTU, Nephelometric turbidity unit; Hg, mercury; <, less 

than detection limit; --, missing value; mm, millimeter; lab, laboratory; fld, field; μS/cm, microsiemen per centimeter at 25 degrees Celsius; cm, centimeter; °C, degrees 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; 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 3/30/05 17:30 22,000 173 -- 757 -- -- 7.8 15453500 5/13/05 11:15 402,000 140 270 756 11.9 8.0 7.9 15453500 5/23/05 16:00 466,000 119 240 -- 9.9 8.4 8.0 15453500 6/2/05 17:00 398,000 131 160 767 9.7 8.0 7.8 15453500 7/6/05 17:30 188,000 140 220 750 10.4 8.0 8.0 15453500 8/1/05 16:00 173,000 152 140 762 9.8 8.1 8.2 15453500 8/22/05 17:20 163,500 142 530 -- 11.6 7.9 7.0 

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) 

15453500 3/30/05 17:30 268 257 -7.8 0.0 0.035 0.025 43.0 10.5 15453500 5/13/05 11:15 175 171 -- 5.8 0.619 0.463 25.1 5.63 15453500 5/23/05 16:00 155 155 -- 6.6 0.413 0.311 23.3 5.25 15453500 6/2/05 17:00 176 189 -- 12.7 0.285 0.213 10.4 2.49 15453500 7/6/05 17:30 202 228 -- 13.8 0.109 0.080 33.3 8.64 15453500 8/1/05 16:00 237 240 -- 14.9 0.312 0.244 32.5 8.59 15453500 2/22/05 17:20 238 247 -- 13.4 0.087 0.064 32.8 8.84 

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, 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 3/30/05 17:30 1.20 2.93 113 109 133 0.0 15453500 5/13/05 11:15 1.52 1.96 62 55 72 0.0 15453500 5/23/05 16:00 1.12 1.70 58 58 70 0.0 15453500 6/2/05 17:00 0.40 0.80 67 69 84 0.0 15453500 7/63/05 17:30 1.44 2.60 83 75 91 0.0 15453500 8/1/05 16:00 1.23 2.83 83 85 103 0.0 15453500 8/22/05 17:20 1.70 3.25 79 86 104 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 3/30/05 17:30 0.85 0.1 7.60 35.0 E0.006 E0.06 0.10 15453500 5/13/05 11:15 1.228 E0.1 4.14 20.5 0.024 0.60 1.40 15453500 5/23/05 16:00 0.45 E0.1 4.21 20.1 <0.010 0.30 0.87 15453500 6/2/05 17:00 0.38 E0.1 2.09 25.8 <0.010 0.26 0.63 15453500 7/6/05 17:30 0.67 E0.1 6.31 33.8 0.010 0.11 0.31 15453500 8/1/05 16:00 0.59 0.1 6.42 37.0 0.013 0.18 0.31 15453500 8/22/05 17:20 0.62 0.1 6.14 34.8 0.015 0.20 0.41 

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

Station ID Date/Time Carbon, Inorganic Particulate 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, Inorganic + 

Organic Particulate 

Total (mg/L) 

15453500 3/30/05 17:30 0.097 0.002 0.03 <0.004 <0.006 0.022 0.4 15453500 5/13/05 11:15 0.066 0.002 0.82 0.015 <0.006 0.62 17.6 15453500 5/23/05 16:00 0.053 E0.001 0.24 0.008 <0.006 0.55 5.1 15453500 6/2/05 17:00 0.058 E0.001 0.35 E0.004 <0.006 0.47 9.9 15453500 7/6/05 17:30 0.044 E0.001 0.16 E0.003 <0.006 0.43 4.7 15453500 8/1/05 16:00 0.053 E0.001 0.20 E0.002 <0.006 0.28 5.8 15453500 8/22/05 17:20 0.038 0.002 0.20 E0.003 <0.006 0.52 7.8 

Barium 

(μg/L) 

15453500 3/30/05 17:30 <0.1 1.4 0.4 E1 E0.11 0.4 58 15453500 5/13/05 11:15 4.0 16.6 13.6 29 E0.11 0.7 45 15453500 5/23/05 16:00 2.5 11.4 2.6 33 <0.20 0.7 38 15453500 6/2/05 17:00 3.2 8.0 6.7 11 <0.20 0.2 17 15453500 7/6/05 17:30 2.1 3.8 2.6 24 E0.16 0.7 50 15453500 8/1/05 16:00 2.7 3.8 3.2 20 E0.20 0.7 42 15453500 8/22/05 17:20 5.4 2.8 2.3 17 0.27 0.7 48 

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 3/30/05 17:30 <0.06 12 <0.04 <0.8 0.079 0.7 9 <0.08 2.4 6.8 15453500 5/13/05 11:15 <0.06 E6 E0.02 <0.8 0.329 5.7 163 0.13 2.8 31.7 15453500 5/23/05 16:00 <0.06 13 <0.04 <0.8 0.198 4.8 112 <0.08 2.7 9.4 15453500 6/2/05 17:00 <0.06 E5 E0.03 <0.8 0.076 5.1 26 1.44 1.0 2.5 15453500 7/6/05 17:30 <0.06 10 <0.04 <0.8 0.080 1.8 10 <0.08 3.3 3.4 15453500 8/1/05 16:00 <0.06 12 <0.04 <0.8 0.097 2.1 8 <0.08 3.1 5.0 15453500 8/22/05 17:20 <0.06 14 <0.04 <0.8 0.105 2.9 9 <0.08 4.1 3.8 

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 3/30/05 17:30 1.2 1.32 0.7 <0.2 180 0.7 0.6 0.91 94 14 15453500 5/13/05 11:15 0.5 4.15 E0.2 <0.2 92.1 0.6 5.5 0.53 84 985 15453500 5/23/05 16:00 0.6 2.63 0.4 <0.2 83.8 0.6 1.7 0.61 80 781 15453500 6/2/05 17:00 E0.3 3.54 <0.4 <0.2 43.2 0.3 16.5 0.22 79 499 15453500 7/6/05 17:30 1.2 1.77 0.6 <0.2 140 0.6 2.5 0.89 81 403 15453500 8/1/05 16:00 1.3 1.51 0.7 <0.2 148 0.7 E0.5 0.78 75 311 15453500 8/22/05 17:20 1.5 2.42 0.6 <0.2 148 0.8 0.7 0.83 91 616 

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; mg/L, milligram per liter; NTU, Nephelometric turbidity unit; Hg, mercury; <, less 

than detection limit; --, missing value; mm, millimeter; lab, laboratory; fld, field; μS/cm, microsiemen per centimeter at 25 degrees Celsius; cm, centimeter; °C, degrees 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; 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 3/31/05 18:00 7,500 184 7.3 747 10.1 7.8 7.7 15515500 5/10/05 18:00 36,200 152 130 745 9.9 7.4 7.9 15515500 5/18/05 16:30 40,600 159 210 -- 10.1 7.8 8.0 15515500 5/27/05 15:00 32,000 170 160 -- 10.3 7.9 8.1 15515500 7/12/05 14:30 75,800 154 650 758 9.3 7.9 8.0 15515500 8/5/05 14:50 54,000 164 390 -- 12.6 7.9 8.1 15515500 8/30/05 14:10 44,000 172 340 -- 10.7 7.9 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) 

15515500 3/31/05 18:00 289 303 25.0 0.0 0.025 0.019 47.0 10.1 15515500 5/10/05 18:00 218 217 18.0 11.9 0.239 0.177 30.3 7.15 15515500 5/18/05 16:30 222 222 -- 10.4 0.138 0.103 29.8 7.86 15515500 5/27/05 15:00 242 268 -- 13.8 0.083 0.061 34.7 10.2 15515500 7/12/05 14:30 224 253 -- 15.7 0.089 0.065 33.4 7.91 15515500 8/5/05 14:50 259 257 -- 14.1 0.085 0.062 35.6 7.91 15515500 8/30/05 14:10 274 264 -- 10.9 0.048 0.035 38.7 8.88 

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 3/31/05 18:00 2.34 4.45 126 128 156 0.0 15515500 5/10/05 18:00 1.76 3.70 76 76 93 0.0 15515500 5/18/05 16:30 1.77 3.57 72 60 73 0.0 15515500 5/27/05 15:00 2.13 4.50 88 89 109 0.0 15515500 7/12/05 14:30 2.04 3.81 74 72 87 0.0 15515500 8/5/05 14:50 1.88 4.12 82 82 100 0.0 15515500 8/30/05 14:10 2.04 4.81 90 86 105 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 3/31/05 18:00 1.26 0.1 16.1 35.3 0.053 0.11 0.11 15515500 5/10/05 18:00 1.82 0.1 9.14 30.8 0.010 0.22 0.51 15515500 5/18/05 16:30 1.48 E0.1 8.36 38.0 E0.009 0.20 0.44 15515500 5/27/05 15:00 1.91 0.1 9.57 46.3 E0.009 0.17 0.30 15515500 7/12/05 14:30 1.23 0.1 7.10 47.0 E0.006 0.16 0.60 15515500 8/5/05 14:50 1.34 0.1 8.11 46.7 E0.005 0.11 0.36 15515500 8/30/05 14:10 1.75 0.1 8.77 50.0 0.012 0.57 0.39 

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

Station ID Date/Time Carbon, Inorganic Particulate 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, NO2+ 

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, Inorganic + 

Organic Particulate 

Total (mg/L) 

15515500 3/31/05 18:00 0.164 0.003 <0.02 <0.004 E0.003 0.028 0.3 15515500 5/10/05 18:00 0.148 0.003 0.29 0.010 E0.004 0.60 5.0 15515500 5/18/05 16:30 0.188 E0.001 0.26 0.005 <0.006 0.71 4.4 15515500 5/27/05 15:00 0.142 E0.001 0.16 0.49 0.494 0.47 2.7 15515500 7/12/05 14:30 0.112 E0.001 0.36 0.005 <0.006 1.19 6.8 15515500 8/5/05 14:50 0.125 E0.001 0.19 E0.003 <0.006 0.76 2.7 15515500 8/30/05 14:10 0.089 E0.001 0.14 E0.003 <0.006 0.71 2.3 

Barium 

(μg/L) 

15515500 3/31/05 18:00 <0.1 1.0 0.3 E2 E0.17 0.5 50 15515500 5/10/05 18:00 0.4 6.9 4.5 18 0.20 1.1 34 15515500 5/18/05 16:30 0.4 3.8 4.1 16 0.21 0.9 33 15515500 5/27/05 15:00 0.3 3.8 2.3 14 0.26 1.0 33 15515500 7/12/05 14:30 1.5 4.4 5.3 14 0.34 1.1 36 15515500 8/5/05 14:50 0.5 2.9 2.1 14 0.26 1.0 31 15515500 8/30/05 14:10 0.3 2.0 2.0 15 0.33 1.0 36 

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 3/31/05 18:00 <0.06 18 E0.03 <0.8 0.247 1.5 12 <0.08 2.7 88.0 15515500 5/10/05 18:00 <0.06 28 E0.03 <0.8 0.164 4.3 88 0.09 3.4 16.2 15515500 5/18/05 16:30 <0.06 18 <0.04 <0.8 0.184 4.2 41 E0.06 3.4 15.5 15515500 5/27/05 15:00 <0.06 29 <0.04 <0.8 0.151 2.2 20 <0.08 5.1 10.5 15515500 7/12/05 14:30 <0.06 26 E0.02 <0.8 0.104 2.2 8 E0.05 4.3 5.0 15515500 8/5/05 14:50 <0.06 22 <0.04 <0.8 0.109 2.3 14 <0.08 3.9 7.1 15515500 8/30/05 14:10 <0.06 27 0.04 <0.8 0.129 1.6 E3 <0.08 5.3 22.2 

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) Sediment, Susp. (mg/L)

15515500 3/31/05 18:00 1.2 3.31 0.5 <0.2 222 1.0 1.2 0.84 68 20 15515500 5/10/05 18:00 0.9 1.85 0.5 <0.2 148 0.7 1.3 0.73 43 787 15515500 5/18/05 16:30 0.9 2.50 0.6 <0.2 132 0.6 4.0 0.80 52 930 15515500 5/27/05 15:00 1.1 2.69 0.6 <0.2 168 0.5 E0.5 0.79 53 646 15515500 7/12/05 14:30 1.2 2.29 0.8 <0.2 151 0.6 E0.5 0.81 70 2,210 15515500 8/5/05 14:50 1.2 1.54 0.6 <0.2 159 1.2 E0.5 0.78 50 1,600 15515500 8/30/05 14:10 1.3 1.40 0.6 <0.2 182 1.8 E0.6 0.93 66 1,090 

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; mg/L, milligram per liter; NTU, Nephelometric turbidity unit; Hg, mercury; <, less 

than detection limit; --, missing value; mm, millimeter; lab, laboratory; fld, field; μS/cm, microsiemen per centimeter at 25 degrees Celsius; cm, centimeter; °C, degrees 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; 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 3/17/05 19:30 41,600 189 7.9 767 2.5 7.0 7.2 15565447 5/17/05 10:30 1,150,000 112 270 748 10.1 7.9 8.0 15565447 6/1/05 12:00 761,000 120 130 762 9.2 7.8 7.8 15565447 6/14/05 15:30 680,000 114 100 762 8.0 7.9 7.7 15565447 7/12/05 09:30 416,000 144 230 756 9.1 8.1 8.1 15565447 8/16/05 18:20 316,000 165 190 762 8.5 7.9 8.0 15565447 9/27/05 14:50 377,000 160 67 742 10.9 7.9 6.1 

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) 

15565447 3/17/05 19:30 317 315 -0.3 0.0 0.063 0.045 47.9 11.7 15565447 5/17/05 10:30 149 150 4.4 5.5 0.524 0.393 22.4 4.20 15565447 6/1/05 12:00 166 165 12.6 12.5 0.371 0.277 24.2 4.63 15565447 6/14/05 15:30 178 189 19.6 15.6 0.255 0.189 27.6 5.95 15565447 7/12/05 09:30 199 222 -- 17.5 0.194 0.143 30.8 7.39 15565447 8/16/05 18:20 254 255 19.7 16.8 0.197 0.160 35.2 8.61 15565447 9/27/05 14:50 231 225 9.0 9.0 0.248 0.184 30.8 7.86 

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 3/17/05 19:30 1.15 0.1 13.2 26.8 0.080 0.20 0.22 15565447 5/17/05 10:30 0.73 E0.1 4.76 12.8 0.049 0.51 0.98 15565447 6/1/05 12:00 0.52 E0.1 4.97 18.0 E0.008 0.31 0.68 15565447 6/14/05 15:30 0.51 E0.1 5.86 25.7 E0.005 0.22 0.51 15565447 7/12/05 09:30 0.83 0.1 6.88 32.3 E0.006 0.19 0.64 15565447 8/16/05 18:20 0.78 0.1 7.27 39.4 E0.007 E0.10 0.35 15565447 9/27/05 14:50 1.26 E0.1 7.55 36.6 E0.006 0.22 0.40 

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 3/17/05 19:30 1.39 3.93 141 128 156 0.0 15565447 5/17/05 10:30 1.16 1.72 60 62 76 0.0 15565447 6/1/05 12:00 1.16 1.66 65 64 79 0.0 15565447 6/14/05 15:30 1.11 1.80 70 59 72 0.0 15565447 7/12/05 09:30 1.58 2.76 81 100 122 0.0 15565447 8/16/05 18:20 1.53 3.24 89 119 145 0.0 15565447 9/27/05 14:50 1.07 2.76 78 101 124 0.0 

Station ID Date/Time 

Nitrogen, NO2+ 

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, Inorganic + 

Organic Particulate 

Total (mg/L) 

15565447 3/17/05 19:30 0.195 0.002 0.03 E0.003 E0.003 0.02 0.4 15565447 5/17/05 10:30 0.121 0.004 0.64 0.018 0.006 0.70 11.8 15565447 6/1/05 12:00 0.079 0.002 0.34 0.010 <0.006 0.30 6.0 15565447 6/14/05 15:30 0.084 E0.001 0.37 0.007 <0.006 0.30 5.4 15565447 7/12/05 09:30 0.094 E0.001 0.35 0.009 E0.004 0.39 6.6 15565447 8/16/05 18:20 0.105 0.002 0.27 0.006 E0.003 0.32 5.6 15565447 9/27/05 14:50 0.113 E0.001 0.21 0.013 E0.005 0.17 3.3 

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

Station ID Date/Time Carbon, Inorganic Particulate 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 3/17/05 19:30 <0.1 2.1 0.4 E1 <0.20 0.4 81 15565447 5/17/05 10:30 2.4 14.4 9.4 29 0.22 1.1 39 15565447 6/1/05 12:00 0.6 10.2 5.5 21 0.25 1.0 45 15565447 6/14/05 15:30 0.4 7.0 4.9 14 0.25 0.9 43 15565447 7/12/05 09:30 1.7 5.8 4.8 12 0.29 1.1 48 15565447 8/16/05 18:20 1.4 3.5 4.2 13 0.27 0.9 50 15565447 9/27/05 14:50 0.1 6.5 3.1 17 0.22 0.9 46 

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 3/17/05 19:30 <0.06 14 E0.04 <0.8 0.239 1.4 94 0.20 2.9 139 15565447 5/17/05 10:30 <0.06 9 <0.04 <0.8 0.294 6.0 332 0.23 1.9 72.4 15565447 6/1/05 12:00 <0.06 E4 <0.04 <0.8 0.176 5.3 193 0.63 1.7 29.3 15565447 6/14/05 15:30 <0.06 E5 E0.02 <0.8 0.118 2.9 150 0.17 2.4 16.8 15565447 7/12/05 09:30 <0.06 12 0.06 <0.8 0.092 2.6 207 0.20 2.7 2.7 15565447 8/16/05 18:20 <0.06 12 <0.04 <0.8 0.104 2.4 50 E0.07 3.5 3.7 15565447 9/27/05 14:50 <0.06 12 E0.03 0.21 0.080 3.1 178 0.14 2.4 10.0 

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 3/17/05 19:30 0.8 1.92 E0.3 <0.2 208 1.4 3.8 0.95 95 5 15565447 5/17/05 10:30 0.6 2.57 <0.4 <0.2 80.2 1.1 1.2 0.56 72 863 15565447 6/1/05 12:00 0.6 2.76 E0.3 <0.2 95.0 0.8 1.7 0.47 63 612 15565447 6/14/05 15:30 0.7 2.38 E0.3 <0.2 105 0.8 2.4 0.47 69 393 15565447 7/12/05 09:30 1.2 2.03 0.5 <0.2 128 0.8 1.7 0.70 86 461 15565447 8/16/05 18:20 1.3 2.26 0.5 <0.2 156 0.6 1.1 0.84 64 413 15565447 9/27/05 14:50 0.9 1.10 0.4 <0.2 135 0.6 0.7 0.76 82 287 

21
CHAPTER 3 - Dissolved Organic Carbon Characterization 

by George R. Aiken 

A description of sample collection and processing of samples for dissolved organic carbon 

(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 

2005 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 4/7/2005 1.9 0.035 1.8 2.6 39 

15356000 5/11/2005 13.6 0.461 3.4 -- -- 

15356000 5/24/2005 7.4 0.247 3.3 4.0 43 

15356000 6/14/2005 3.6 0.106 2.9 3.6 51 

15356000 7/7/2005 7.4 0.231 3.1 3.8 52 

15356000 8/4/2005 6.4 0.194 3.0 3.4 54 

15356000 8/30/2005 3.4 0.088 2.6 3.2 49 

15389000 4/6/2005 1.9 0.033 1.7 2.7 38 

15389000 5/19/2005 18.6 0.637 3.4 4.2 56 

15389000 5/25/2005 16.2 0.531 3.3 4.0 51 

15389000 6/7/2005 15.2 0.524 3.4 3.9 56 

15389000 7/14/2005 6.7 0.181 2.7 3.3 49 

15389000 8/3/2005 6.9 0.178 2.6 3.0 53 

15389000 8/26/2005 8.6 0.237 2.8 3.4 50 

15453500 3/30/2005 2.0 0.039 2.0 2.7 47 

15453500 5/13/2005 19.4 0.607 3.1 4.2 48 

15453500 5/23/2005 11.8 0.413 3.5 4.3 56 

15453500 6/2/2005 8.2 0.281 3.5 3.8 60 

15453500 7/6/2005 4.0 0.106 2.6 3.2 50 

15453500 8/1/2005 4.2 0.112 2.7 3.4 46 

15453500 8/22/2005 3.2 0.083 2.6 3.2 49 

15515500 3/31/2005 1.5 0.024 1.6 2.4 37 

15515500 5/10/2005 8.1 0.237 2.9 3.9 49 

15515500 5/18/2005 4.7 0.133 2.9 3.7 46 

15515500 5/27/2005 3.0 0.080 2.6 -- -- 

15515500 7/12/2005 3.6 0.084 2.4 3.3 45 

15515500 8/5/2005 3.3 0.082 2.6 3.2 56 

15515500 8/30/2005 2.1 0.048 2.2 2.7 43 

15565447 3/17/2005 2.6 0.061 2.4 2.6 51 

15565447 5/17/2005 16.7 0.499 3.0 3.7 50 

15565447 6/1/2005 10.9 0.376 3.5 4.0 56 

15565447 6/14/2005 7.7 0.261 3.4 3.2 54 

15565447 7/12/2005 6.1 0.189 3.1 3.6 53 

15565447 8/16/2005 4.6 0.115 2.5 3.5 41 

15565447 9/27/2005 7.7 0.247 3.2 3.5 53 

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 

Matter SUVA 

[L/{mg C*m)] 

Hydrophilic 

Organic Matter 

(%) 

Transphilic 

Acids SUVA 

[L/(mg C*m)] 

Transphilic 

Acids 

(%) 

15356000 4/7/2005 -- -- -- -- 

15356000 5/11/2005 -- -- -- -- 

15356000 5/24/2005 2.2 15 2.7 15 

15356000 6/14/2005 1.5 18 2.2 18 

15356000 7/7/2005 1.6 15 2.7 17 

15356000 8/4/2005 1.6 15 2.7 17 

15356000 8/30/2005 1.5 20 2.1 19 

15389000 4/6/2005 -- -- -- -- 

15389000 5/19/2005 1.5 19 2.6 14 

15389000 5/25/2005 1.7 18 2.6 12 

15389000 6/7/2005 1.5 19 2.4 16 

15389000 7/14/2005 1.4 19 2.2 17 

15389000 8/3/2005 1.4 18 2.0 18 

15389000 8/26/2005 2.1 16 2.2 17 

15453500 3/30/2005 -- -- -- -- 

15453500 5/13/2005 1.5 20 2.7 14 

15453500 5/23/2005 1.7 21 2.7 16 

15453500 6/2/2005 1.7 16 2.3 17 

15453500 7/6/2005 1.4 18 2.1 16 

15453500 8/1/2005 1.0 21 2.0 20 

15453500 8/22/2005 1.5 17 2.0 22 

15515500 3/31/2005 -- -- -- -- 

15515500 5/10/2005 1.2 19 2.3 16 

15515500 5/18/2005 1.3 18 1.7 15 

15515500 5/27/2005 -- -- -- -- 

15515500 7/12/2005 -- 15 2.1 16 

15515500 8/5/2005 2.2 23 2.2 18 

15515500 8/30/2005 -- -- -- -- 

15565447 3/17/2005 -- -- -- -- 

15565447 5/17/2005 2 18 2.2 9 

15565447 6/1/2005 1.8 18 2.8 15 

15565447 6/14/2005 1.9 17 2.6 16 

15565447 7/12/2005 1.6 16 2.4 16 

15565447 8/16/2005 2.0 15 2.4 17 

15565447 9/27/2005 2.2 14 2.5 21 

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 2005 are given below 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; *, 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 SD A SD A SD A SD

15356000 04/07/05 2 ± 0.1 0.35 ± 0.02 10.0 ± 1.1 49 ± 3 < 0.01 ± 0.000 < 0.0009 ± 0.0003 34 ± 0 15356000 05/11/05 58 ± 0.6 0.53 ± 0.01 5.3 ± 1.1 37 ± 1 0.010 ± 0.004 0.0020 ± 0.0015 23 ± 1 15356000 05/24/05 32 ± 0.0 0.55 ± 0.02 4.1 ± 0.1 36 ± 2 0.012 ± 0.003 0.0047 ± 0.0018 24 ± 1 15356000 06/14/05 57 ± 0.3 0.53 ± 0.02 10.0 ± 1.1 55 ± 0 0.009 ± 0.003 0.0030 ± 0.001 27 ± 0 15356000 07/07/05 30 ± 0.5 0.72 ± 0.00 8.9 ± 0.7 36 ± 1 < 0.01 ± 0.000 0.0019 ± 0.0011 26 ± 1 15356000 08/04/05 27 ± 0.1 0.60 ± 0.03 10.0 ± 0.8 38 ± 1 0.010 ± 0.002 < 0.0009 ± 0.0000 29 ± 1 15356000 08/30/05 22 ± 0.2 0.55 ± 0.01 11.3 ± 0.3 39 ± 0 < 0.01 ± 0.010 < 0.0009 ± 0.0005 31 ± 1 15389000 04/06/05 1 ± 0.1 0.21 ± 0.01 10.2 ± 0.5 98 ± 4 < 0.01 ± 0.010 < 0.0009 ± 0.0002 60 ± 1 15389000 05/19/05 63 ± 0.2 0.33 ± 0.01 4.4 ± 0.8 32 ± 1 0.020 ± 0.000 0.0023 ± 0.0007 16 ± 1 15389000 05/25/05 25 ± 0.3 0.38 ± 0.02 4.5 ± 0.9 38 ± 2 0.022 ± 0.004 0.0054 ± 0.0042 19 ± 0 15389000 06/07/05 37 ± 1.9 0.39 ± 0.02 5.4 ± 0.5 42 ± 3 0.018 ± 0.006 0.0017 ± 0.0002 20 ± 0 15389000 07/14/05 12 ± 0.7 0.32 ± 0.01 9.1 ± 1.0 66 ± 2 < 0.01 ± 0.000 0.0011 ± 0.0007 37 ± 2 15389000 08/03/05 11 ± 0.3 0.31 ± 0.00 9.2 ± 0.2 63 ± 3 < 0.01 ± 0.000 < 0.0009 ± 0.0005 38 ± 1 15389000 08/26/05 14 ± 0.4 0.32 ± 0.01 9.4 ± 0.2 68 ± 2 0.011 ± 0.003 < 0.0009 ± 0.0005 38 ± 0 15453500 03/30/05 1 ± 0.0 0.30 ± 0.01 8.5 ± 0.6 60 ± 2 < 0.01 ± 0.000 0.0011 ± 0.0012 41 ± 1 15453500 05/13/05 28 ± 0.4 0.63 ± 0.02 5.4 ± 0.5 43 ± 2 0.016 ± 0.008 0.0015 ± 0.0001 26 ± 1 15453500 05/23/05 27 ± 0.1 0.59 ± 0.02 4.5 ± 0.4 35 ± 1 0.011 ± 0.009 0.0015 ± 0.0007 24 ± 1 15453500 06/02/05 23 ± 1.4 0.56 ± 0.01 4.2 ± 0.6 39 ± 4 0.011 ± 0.006 0.0016 ± 0.0008 25 ± 0 15453500 07/06/05 20 ± 1.6 0.66 ± 0.04 9.5 ± 0.7 44 ± 6 < 0.01 ± 0.000 0.0009 ± 0.0010 29 ± 0 15453500 08/01/05 21 ± 0.5 0.64 ± 0.02 10.1 ± 0.5 45 ± 1 < 0.01 ± 0.000 < 0.0009 ± 0.0001 33 ± 0 15453500 08/22/05 17 ± 0.6 0.64 ± 0.00 11.1 ± 1.3 44 ± 1 < 0.01 ± 0.000 < 0.0009 ± 0.0001 34 ± 1 

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 03/31/05 1 ± 0.1 0.48 ± 0.01 18.9 ± 0.5 45 ± 1 < 0.01 ± 0.00 < 0.0009 ± 0.0001 46 ± 1 15515500 05/10/05 18 ± 0.2 1.0 ± 0.0 21.2 ± 0.8 32 ± 1 < 0.01 ± 0.00 0.0014 ± 0.0011 31 ± 1 15515500 05/18/05 15 ± 0.8 0.85 ± 0.02 18.5 ± 0.7 30 ± 1 < 0.01 ± 0.00 < 0.0009 ± 0.0002 32 ± 0 15515500 05/27/05 19 ± 0.8 0.87 ± 0.02 24.0 ± 0.6 31 ± 2 < 0.01 ± 0.00 < 0.0009 ± 0.0000 33 ± 1 15515500 07/12/05 17 ± 1.5 1.0 ± 0.1 19.8 ± 1.0 30 ± 3 < 0.01 ± 0.00 < 0.0009 ± 0.0007 30 ± 0 15515500 08/05/05 41 ± 0.4 1.0 ± 0.0 22.6 ± 0.9 31 ± 1 < 0.01 ± 0.00 < 0.0009 ± 0.0002 35 ± 1 15515500 08/05/05* 16 ± 0.2 1.0 ± 0.0 22.8 ± 0.3 31 ± 1 < 0.01 ± 0.01 < 0.0009 ± 0.0011 35 ± 1 15515500 08/30/05 13 ± 0.1 1.0 ± 0.0 25.6 ± 0.6 33 ± 1 < 0.01 ± 0.00 < 0.0009 ± 0.0004 38 ± 1 15565447 03/17/05 2 ± 0.1 0.38 ± 0.02 11.9 ± 0.6 73 ± 3 < 0.01 ± 0.00 0.0010 ± 0.0007 45 ± 0 15565447 05/17/05 25 ± 1.0 1.0 ± 0.0 7.4 ± 0.6 37 ± 3 < 0.01 ± 0.00 0.0048 ± 0.0017 23 ± 0 15565447 06/01/05 16 ± 0.4 0.95 ± 0.03 6.0 ± 2.1 42 ± 3 < 0.01 ± 0.01 0.0043 ± 0.0021 25 ± 1 15565447 06/14/05 15 ± 0.7 0.95 ± 0.02 5.5 ± 0.1 41 ± 1 < 0.01 ± 0.00 0.0031 ± 0.0003 27 ± 1 15565447 07/12/05 13 ± 0.2 1.1 ± 0.1 9.8 ± 1.3 46 ± 3 < 0.01 ± 0.00 0.0039 ± 0.0023 29 ± 0 15565447 08/16/05 12 ± 0.3 0.86 ± 0.02 10.2 ± 0.6 47 ± 2 < 0.01 ± 0.00 < 0.0009 ± 0.0007 32 ± 1 15565447 09/27/05 18 ± 0.3 0.86 ± 0.02 8.3 ± 0.3 41 ± 1 < 0.01 ± 0.00 0.0028 ± 0.0007 30 ± 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 04/07/05 0.018 ± 0.004 0.008 ± 0.000 0.004 ± 0.003 0.17 ± 0.03 < 0.009 ± 0.012 0.73 ± 0.01 15356000 05/11/05 0.049 ± 0.003 0.278 ± 0.008 0.117 ± 0.005 0.08 ± 0.02 < 0.009 ± 0.007 3.25 ± 0.01 15356000 05/24/05 0.028 ± 0.001 0.113 ± 0.002 0.076 ± 0.003 0.11 ± 0.03 < 0.009 ± 0.008 2.60 ± 0.05 15356000 06/14/05 0.021 ± 0.001 0.079 ± 0.002 0.053 ± 0.003 0.01 ± 0.02 < 0.002 ± 0.005 1.39 ± 0.03 15356000 07/07/05 0.008 ± 0.002 0.082 ± 0.002 0.047 ± 0.004 0.09 ± 0.01 < 0.009 ± 0.003 2.84 ± 0.05 15356000 08/04/05 0.007 ± 0.002 0.060 ± 0.001 0.046 ± 0.002 0.15 ± 0.00 < 0.009 ± 0.007 1.91 ± 0.08 15356000 08/30/05 0.006 ± 0.002 0.016 ± 0.000 0.025 ± 0.002 0.07 ± 0.01 0.010 ± 0.005 1.95 ± 0.04 15389000 04/06/05 0.006 ± 0.002 0.004 ± 0.000 0.027 ± 0.006 0.14 ± 0.01 0.012 ± 0.010 0.58 ± 0.02 15389000 05/19/05 0.026 ± 0.001 0.312 ± 0.012 0.230 ± 0.006 0.14 ± 0.02 < 0.009 ± 0.006 3.11 ± 0.03 15389000 05/25/05 0.014 ± 0.000 0.143 ± 0.001 0.079 ± 0.003 < 0.05 ± 0.06 < 0.009 ± 0.006 2.86 ± 0.04 15389000 06/07/05 0.009 ± 0.002 0.159 ± 0.015 0.088 ± 0.007 0.18 ± 0.02 < 0.009 ± 0.005 2.33 ± 0.04 15389000 07/14/05 0.005 ± 0.001 0.018 ± 0.002 0.031 ± 0.006 0.09 ± 0.01 < 0.009 ± 0.007 1.21 ± 0.01 15389000 08/03/05 0.004 ± 0.001 0.010 ± 0.000 0.049 ± 0.004 0.14 ± 0.02 < 0.009 ± 0.008 1.37 ± 0.04 15389000 08/26/05 0.006 ± 0.002 0.020 ± 0.001 0.056 ± 0.004 0.18 ± 0.02 < 0.009 ± 0.010 1.34 ± 0.03 15453500 03/30/05 0.005 ± 0.001 0.004 ± 0.000 0.010 ± 0.002 0.13 ± 0.01 0.009 ± 0.012 0.53 ± 0.04 15453500 05/13/05 0.035 ± 0.001 0.270 ± 0.002 0.239 ± 0.004 0.08 ± 0.02 0.010 ± 0.011 9.14 ± 0.16 15453500 05/23/05 0.017 ± 0.001 0.180 ± 0.010 0.104 ± 0.012 0.06 ± 0.01 < 0.009 ± 0.005 4.06 ± 0.03 15453500 06/02/05 0.014 ± 0.001 0.091 ± 0.009 0.052 ± 0.005 < 0.05 ± 0.02 < 0.009 ± 0.003 3.57 ± 0.02 15453500 07/06/05 0.009 ± 0.001 0.015 ± 0.002 0.028 ± 0.005 0.07 ± 0.00 < 0.009 ± 0.004 1.73 ± 0.06 15453500 08/01/05 0.007 ± 0.002 0.016 ± 0.001 0.031 ± 0.004 0.09 ± 0.02 < 0.009 ± 0.010 1.88 ± 0.06 15453500 08/22/05 0.005 ± 0.000 0.011 ± 0.000 0.026 ± 0.002 0.10 ± 0.02 0.013 ± 0.006 3.13 ± 0.08 

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 03/31/05 0.016 ± 0.002 0.006 ± 0.001 0.116 ± 0.007 < 0.05 ± 0.01 < 0.009 ± 0.000 1.20 ± 0.06 15515500 05/10/05 0.017 ± 0.001 0.078 ± 0.003 0.103 ± 0.000 0.09 ± 0.01 < 0.009 ± 0.010 3.88 ± 0.05 15515500 05/18/05 0.013 ± 0.003 0.038 ± 0.002 0.081 ± 0.005 < 0.05 ± 0.01 0.010 ± 0.008 3.11 ± 0.04 15515500 05/27/05 0.012 ± 0.001 0.025 ± 0.002 0.061 ± 0.001 0.11 ± 0.02 0.009 ± 0.004 2.99 ± 0.06 15515500 07/12/05 0.009 ± 0.002 0.014 ± 0.002 0.051 ± 0.005 < 0.05 ± 0.04 0.012 ± 0.001 1.88 ± 0.06 15515500 08/05/05 0.009 ± 0.002 0.031 ± 0.002 0.065 ± 0.002 0.14 ± 0.01 0.019 ± 0.010 1.82 ± 0.04 15515500 08/05/05* 0.009 ± 0.001 0.013 ± 0.000 0.049 ± 0.002 0.07 ± 0.01 0.015 ± 0.010 1.80 ± 0.04 15515500 08/30/05 0.013 ± 0.002 0.009 ± 0.000 0.067 ± 0.004 0.10 ± 0.02 0.011 ± 0.008 1.31 ± 0.03 15565447 03/17/05 0.026 ± 0.002 0.011 ± 0.001 0.131 ± 0.001 0.19 ± 0.01 < 0.009 ± 0.005 1.11 ± 0.02 15565447 05/17/05 0.021 ± 0.001 0.319 ± 0.026 0.207 ± 0.004 0.19 ± 0.02 0.009 ± 0.009 5.13 ± 0.01 15565447 06/01/05 0.011 ± 0.001 0.176 ± 0.015 0.114 ± 0.005 0.08 ± 0.03 0.009 ± 0.007 3.95 ± 0.17 15565447 06/14/05 0.012 ± 0.001 0.115 ± 0.004 0.077 ± 0.006 0.06 ± 0.03 < 0.009 ± 0.006 2.87 ± 0.01 15565447 07/12/05 0.037 ± 0.005 0.071 ± 0.004 0.037 ± 0.007 < 0.05 ± 0.02 < 0.009 ± 0.004 2.44 ± 0.10 15565447 08/16/05 0.012 ± 0.003 0.028 ± 0.002 0.024 ± 0.001 0.14 ± 0.02 < 0.009 ± 0.009 2.00 ± 0.01 15565447 09/27/05 0.021 ± 0.002 0.108 ± 0.001 0.067 ± 0.002 0.11 ± 0.00 < 0.009 ± 0.009 2.84 ± 0.09 

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 Gadolinium 

μg/L μg/L μg/L μg/L μg/L 

A SD A SD A SD A SD A SD

15356000 04/07/05 0.002 ± 0.000 0.002 ± 0.000 0.001 ± 0.001 < 6 ± 9 0.002 ± 0.001 15356000 05/11/05 0.044 ± 0.002 0.024 ± 0.001 0.010 ± 0.001 117 ± 3 0.043 ± 0.000 15356000 05/24/05 0.021 ± 0.000 0.013 ± 0.001 0.005 ± 0.001 66 ± 7 0.022 ± 0.003 15356000 06/14/05 0.011 ± 0.001 0.006 ± 0.000 0.003 ± 0.000 68 ± 7 0.012 ± 0.001 15356000 07/07/05 0.018 ± 0.000 0.011 ± 0.001 0.004 ± 0.002 23 ± 12 0.014 ± 0.002 15356000 08/04/05 0.014 ± 0.000 0.009 ± 0.000 0.003 ± 0.000 23 ± 3 0.012 ± 0.000 15356000 08/30/05 0.004 ± 0.000 0.004 ± 0.000 0.001 ± 0.001 10 ± 4 0.003 ± 0.000 15389000 04/06/05 0.002 ± 0.000 0.001 ± 0.001 0.001 ± 0.001 36 ± 9 0.001 ± 0.001 15389000 05/19/05 0.081 ± 0.005 0.042 ± 0.001 0.019 ± 0.001 311 ± 14 0.087 ± 0.002 15389000 05/25/05 0.044 ± 0.003 0.024 ± 0.001 0.010 ± 0.001 145 ± 14 0.045 ± 0.002 15389000 06/07/05 0.048 ± 0.003 0.027 ± 0.001 0.012 ± 0.000 222 ± 10 0.061 ± 0.001 15389000 07/14/05 0.007 ± 0.002 0.004 ± 0.000 0.001 ± 0.001 34 ± 12 0.007 ± 0.001 15389000 08/03/05 0.007 ± 0.001 0.004 ± 0.001 0.001 ± 0.000 28 ± 10 0.006 ± 0.001 15389000 08/26/05 0.013 ± 0.000 0.008 ± 0.001 0.003 ± 0.000 42 ± 7 0.013 ± 0.001 15453500 03/30/05 0.002 ± 0.000 0.001 ± 0.000 0.001 ± 0.000 12 ± 8 0.001 ± 0.000 15453500 05/13/05 0.053 ± 0.004 0.027 ± 0.001 0.012 ± 0.001 176 ± 3 0.048 ± 0.001 

15453500 05/23/05 0.037 ± 0.002 0.022 ± 0.001 0.009 ± 0.001 110 ± 8 0.036 ± 0.003 

15453500 06/02/05 0.018 ± 0.000 0.011 ± 0.000 0.005 ± 0.000 49 ± 13 0.019 ± 0.004 

15453500 07/06/05 0.004 ± 0.001 0.003 ± 0.001 0.000 ± 0.001 < 6 ± 13 0.003 ± 0.000 

15453500 08/01/05 0.004 ± 0.001 0.003 ± 0.001 0.001 ± 0.001 < 6 ± 16 0.004 ± 0.001 

15453500 08/22/05 0.003 ± 0.001 0.003 ± 0.001 0.001 ± 0.001 < 6 ± 5 0.002 ± 0.000 

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 Gadolinium

μg/L μg/L μg/L μg/L μg/L 

A SD A SD A SD A SD A SD

15515500 03/31/05 0.001 ± 0.000 0.001 ± 0.001 0.001 ± 0.001 < 6 ± 6 0.001 ± 0.000 15515500 05/10/05 0.014 ± 0.001 0.009 ± 0.001 0.003 ± 0.000 81 ± 6 0.013 ± 0.001 15515500 05/18/05 0.008 ± 0.001 0.005 ± 0.000 0.002 ± 0.001 26 ± 8 0.007 ± 0.001 15515500 05/27/05 0.004 ± 0.001 0.003 ± 0.001 0.001 ± 0.001 14 ± 16 0.004 ± 0.001 

15515500 07/12/05 0.004 ± 0.001 0.002 ± 0.001 0.000 ± 0.001 < 6 ± 14 0.003 ± 0.000 

15515500 08/05/05 0.005 ± 0.001 0.003 ± 0.001 0.002 ± 0.000 31 ± 7 0.004 ± 0.001 15515500 08/05/05* 0.004 ± 0.000 0.002 ± 0.001 0.001 ± 0.000 < 6 ± 8 0.003 ± 0.000 15515500 08/30/05 0.003 ± 0.000 0.002 ± 0.000 0.001 ± 0.001 < 6 ± 12 0.002 ± 0.001 

15565447 03/17/05 0.003 ± 0.000 0.003 ± 0.000 0.000 ± 0.001 95 ± 6 0.002 ± 0.000 

15565447 05/17/05 0.053 ± 0.005 0.031 ± 0.000 0.012 ± 0.002 329 ± 11 0.048 ± 0.001 15565447 06/01/05 0.033 ± 0.001 0.019 ± 0.000 0.007 ± 0.001 180 ± 18 0.031 ± 0.003 15565447 06/06/05 0.030 ± 0.002 0.018 ± 0.001 0.008 ± 0.001 254 ± 12 0.031 ± 0.001 15565447 06/14/05 0.019 ± 0.000 0.011 ± 0.001 0.005 ± 0.000 154 ± 10 0.019 ± 0.001 15565447 07/12/05 0.012 ± 0.001 0.007 ± 0.000 0.003 ± 0.002 197 ± 19 0.011 ± 0.000 15565447 08/16/05 0.005 ± 0.000 0.003 ± 0.001 0.001 ± 0.001 55 ± 14 0.004 ± 0.000 15565447 09/27/05 0.021 ± 0.001 0.012 ± 0.000 0.005 ± 0.000 195 ± 4 0.021 ± 0.001 

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

Basin—Continued 

Magnesium Station ID Date Holmium Potassium Lanthanum Lithium Lutetium

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 04/07/05 0.000 ± 0.000 1.10 ± 0.04 0.007 ± 0.000 2.2 ± 0.0 0.000 ± 0.000 9.4 ± 0.3 15356000 05/11/05 0.009 ± 0.000 1.10 ± 0.02 0.159 ± 0.003 2.0 ± 0.0 0.003 ± 0.000 6.9 ± 0.2 15356000 05/24/05 0.005 ± 0.000 0.89 ± 0.01 0.063 ± 0.001 2.0 ± 0.0 0.002 ± 0.000 6.9 ± 0.3 15356000 06/14/05 0.002 ± 0.000 0.97 ± 0.02 0.045 ± 0.000 2.4 ± 0.0 0.001 ± 0.000 8.4 ± 0.1 15356000 07/07/05 0.004 ± 0.001 1.37 ± 0.01 0.046 ± 0.002 2.6 ± 0.0 0.002 ± 0.000 7.3 ± 0.1 15356000 08/04/05 0.003 ± 0.000 1.15 ± 0.02 0.033 ± 0.001 2.7 ± 0.0 0.001 ± 0.000 8.4 ± 0.3 15356000 08/30/05 0.001 ± 0.000 1.31 ± 0.02 0.010 ± 0.000 3.1 ± 0.1 0.001 ± 0.000 9.1 ± 0.4 15389000 04/06/05 0.000 ± 0.000 0.61 ± 0.01 0.004 ± 0.000 6.8 ± 0.0 0.000 ± 0.000 14.2 ± 0.1 15389000 05/19/05 0.014 ± 0.000 1.01 ± 0.01 0.145 ± 0.004 1.8 ± 0.0 0.005 ± 0.000 2.7 ± 0.2 15389000 05/25/05 0.008 ± 0.001 1.00 ± 0.01 0.064 ± 0.001 2.1 ± 0.0 0.003 ± 0.000 3.3 ± 0.0 15389000 06/07/05 0.010 ± 0.001 0.69 ± 0.01 0.078 ± 0.007 3.0 ± 0.0 0.003 ± 0.000 4.4 ± 0.0 15389000 07/14/05 0.001 ± 0.000 0.63 ± 0.04 0.010 ± 0.001 5.8 ± 0.0 0.001 ± 0.000 8.3 ± 0.4 15389000 08/03/05 0.001 ± 0.000 0.68 ± 0.01 0.006 ± 0.000 5.5 ± 0.1 0.001 ± 0.000 9.0 ± 0.2 15389000 08/26/05 0.003 ± 0.000 0.66 ± 0.01 0.012 ± 0.000 5.8 ± 0.1 0.001 ± 0.000 9.0 ± 0.1 15453500 03/30/05 0.000 ± 0.000 1.10 ± 0.03 0.004 ± 0.000 2.7 ± 0.0 0.000 ± 0.000 10.3 ± 0.1 15453500 05/13/05 0.011 ± 0.001 1.46 ± 0.03 0.137 ± 0.004 2.3 ± 0.1 0.004 ± 0.000 5.7 ± 0.1 15453500 05/23/05 0.008 ± 0.001 1.11 ± 0.03 0.099 ± 0.005 2.0 ± 0.0 0.003 ± 0.000 5.3 ± 0.2 15453500 06/02/05 0.004 ± 0.001 0.93 ± 0.03 0.053 ± 0.006 2.2 ± 0.1 0.002 ± 0.000 6.5 ± 0.1 15453500 07/06/05 0.001 ± 0.000 1.24 ± 0.04 0.010 ± 0.002 3.0 ± 0.0 0.000 ± 0.000 8.0 ± 0.2 15453500 08/01/05 0.001 ± 0.000 1.23 ± 0.04 0.010 ± 0.000 3.1 ± 0.1 0.001 ± 0.000 8.9 ± 0.3 15453500 08/22/05 0.001 ± 0.000 1.54 ± 0.01 0.008 ± 0.000 3.3 ± 0.0 0.000 ± 0.000 9.1 ± 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 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

15515500 03/31/05 0.000 ± 0.000 2.34 ± 0.02 0.003 ± 0.000 2.8 ± 0.0 0.000 ± 0.000 9.7 ± 0.2 15515500 05/10/05 0.003 ± 0.000 1.70 ± 0.02 0.047 ± 0.001 3.1 ± 0.1 0.002 ± 0.000 7.3 ± 0.2 15515500 05/18/05 0.002 ± 0.000 1.71 ± 0.02 0.023 ± 0.001 3.6 ± 0.1 0.001 ± 0.000 8.1 ± 0.3 15515500 05/27/05 0.001 ± 0.000 1.74 ± 0.05 0.013 ± 0.001 4.4 ± 0.1 0.000 ± 0.000 8.8 ± 0.3 15515500 07/12/05 0.001 ± 0.000 1.86 ± 0.02 0.009 ± 0.002 4.2 ± 0.0 0.000 ± 0.000 7.5 ± 0.1 15515500 08/05/05 0.001 ± 0.000 1.75 ± 0.02 0.018 ± 0.001 4.3 ± 0.1 0.001 ± 0.000 8.8 ± 0.3 15515500 08/05/05* 0.001 ± 0.000 1.76 ± 0.04 0.009 ± 0.000 4.3 ± 0.1 0.001 ± 0.000 8.6 ± 0.2 15515500 08/30/05 0.001 ± 0.000 1.86 ± 0.04 0.007 ± 0.000 4.5 ± 0.0 0.000 ± 0.000 9.3 ± 0.5 15565447 03/17/05 0.001 ± 0.000 1.35 ± 0.03 0.007 ± 0.000 2.8 ± 0.0 0.000 ± 0.000 10.6 ± 0.0 15565447 05/17/05 0.010 ± 0.001 1.17 ± 0.04 0.162 ± 0.014 1.5 ± 0.0 0.004 ± 0.000 4.3 ± 0.1 15565447 06/01/05 0.006 ± 0.001 1.12 ± 0.04 0.095 ± 0.005 1.8 ± 0.1 0.003 ± 0.000 4.7 ± 0.2 15565447 06/14/05 0.004 ± 0.000 1.05 ± 0.04 0.067 ± 0.006 2.0 ± 0.0 0.002 ± 0.000 6.0 ± 0.1 15565447 07/12/05 0.003 ± 0.000 1.38 ± 0.01 0.046 ± 0.001 2.6 ± 0.0 0.001 ± 0.000 7.5 ± 0.0 15565447 08/16/05 0.001 ± 0.000 1.41 ± 0.00 0.017 ± 0.000 3.0 ± 0.1 0.000 ± 0.000 8.4 ± 0.4 15565447 09/27/05 0.004 ± 0.000 1.02 ± 0.04 0.062 ± 0.001 2.4 ± 0.0 0.002 ± 0.000 8.2 ± 0.2 

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 04/07/05 1.3 ± 0.0 1.21 ± 0.00 2.6 ± 0.1 0.008 ± 0.001 0.48 ± 0.09 < 6 ± 3 0.025 ± 0.003 15356000 05/11/05 17.6 ± 0.2 0.66 ± 0.04 1.9 ± 0.2 0.181 ± 0.008 2.54 ± 0.08 < 6 ± 2 0.105 ± 0.005 15356000 05/24/05 9.6 ± 0.5 0.71 ± 0.02 1.6 ± 0.2 0.080 ± 0.006 2.13 ± 0.07 < 6 ± 2 0.073 ± 0.002 15356000 06/14/05 4.5 ± 0.2 0.96 ± 0.02 1.9 ± 0.1 0.049 ± 0.000 1.14 ± 0.04 < 5 ± 1 0.073 ± 0.003 15356000 07/07/05 2.4 ± 0.2 1.16 ± 0.03 2.4 ± 0.2 0.050 ± 0.002 1.42 ± 0.00 8 ± 1 0.031 ± 0.016 15356000 08/04/05 4.1 ± 0.0 1.15 ± 0.03 2.5 ± 0.2 0.045 ± 0.002 1.09 ± 0.06 < 6 ± 1 0.010 ± 0.001 15356000 08/30/05 1.6 ± 0.0 1.33 ± 0.03 2.6 ± 0.2 0.012 ± 0.001 1.02 ± 0.07 < 6 ± 1 0.018 ± 0.003 15389000 04/06/05 17.1 ± 0.2 0.65 ± 0.05 5.1 ± 0.4 0.005 ± 0.001 0.63 ± 0.14 < 6 ± 3 0.021 ± 0.002 15389000 05/19/05 18.8 ± 0.2 0.19 ± 0.01 1.0 ± 0.1 0.246 ± 0.000 3.06 ± 0.05 13 ± 2 0.165 ± 0.007 15389000 05/25/05 3.3 ± 0.4 0.34 ± 0.08 1.1 ± 0.1 0.121 ± 0.002 1.86 ± 0.09 < 6 ± 3 0.102 ± 0.002 15389000 06/07/05 4.4 ± 0.3 0.30 ± 0.02 1.7 ± 0.1 0.154 ± 0.012 2.50 ± 0.00 10 ± 1 0.111 ± 0.012 15389000 07/14/05 1.6 ± 0.1 0.49 ± 0.02 3.9 ± 0.1 0.019 ± 0.001 1.13 ± 0.21 7 ± 1 0.028 ± 0.005 15389000 08/03/05 2.8 ± 0.0 0.47 ± 0.03 3.4 ± 0.0 0.014 ± 0.001 1.33 ± 0.07 < 6 ± 2 0.025 ± 0.002 15389000 08/26/05 3.2 ± 0.0 0.45 ± 0.02 3.7 ± 0.2 0.029 ± 0.000 1.80 ± 0.02 < 6 ± 1 0.016 ± 0.002 15453500 03/30/05 8.2 ± 0.2 1.12 ± 0.07 2.9 ± 0.1 0.005 ± 0.001 0.50 ± 0.10 < 6 ± 2 0.022 ± 0.007 15453500 05/13/05 30.5 ± 0.9 0.48 ± 0.02 1.9 ± 0.1 0.177 ± 0.004 3.21 ± 0.08 13 ± 2 0.251 ± 0.014 15453500 05/23/05 9.8 ± 0.6 0.53 ± 0.01 1.5 ± 0.1 0.124 ± 0.005 2.20 ± 0.11 6 ± 3 0.089 ± 0.006 15453500 06/02/05 4.1 ± 0.3 0.65 ± 0.04 1.7 ± 0.1 0.072 ± 0.002 1.71 ± 0.10 < 6 ± 3 0.059 ± 0.001 15453500 07/06/05 3.8 ± 0.4 1.25 ± 0.01 2.4 ± 0.2 0.011 ± 0.002 0.63 ± 0.10 < 6 ± 1 0.019 ± 0.002 15453500 08/01/05 5.8 ± 0.1 1.18 ± 0.03 2.5 ± 0.1 0.012 ± 0.001 0.76 ± 0.07 < 6 ± 2 0.013 ± 0.002 15453500 08/22/05 4.4 ± 0.0 1.39 ± 0.02 2.7 ± 0.1 0.009 ± 0.001 0.76 ± 0.04 < 6 ± 1 0.021 ± 0.001 

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 03/31/05 92.3 ± 1.8 1.16 ± 0.02 4.0 ± 0.1 0.003 ± 0.001 0.47 ± 0.14 < 6 ± 1 0.026 ± 0.003 15515500 05/10/05 19.8 ± 0.4 0.85 ± 0.01 3.5 ± 0.2 0.052 ± 0.002 1.29 ± 0.09 < 6 ± 2 0.082 ± 0.004 15515500 05/18/05 16.2 ± 0.3 0.88 ± 0.03 3.2 ± 0.0 0.029 ± 0.002 1.54 ± 0.07 < 6 ± 3 0.050 ± 0.004 15515500 05/27/05 13.8 ± 1.1 0.93 ± 0.01 3.7 ± 0.1 0.014 ± 0.000 0.69 ± 0.13 < 6 ± 3 0.073 ± 0.010 15515500 07/12/05 6.7 ± 0.7 1.17 ± 0.08 3.3 ± 0.1 0.011 ± 0.001 0.92 ± 0.03 < 6 ± 1 0.023 ± 0.005 15515500 08/05/05 9.5 ± 0.3 1.12 ± 0.08 3.8 ± 0.2 0.021 ± 0.001 0.80 ± 0.09 < 6 ± 3 0.020 ± 0.001 15515500 08/05/05* 8.5 ± 0.0 1.10 ± 0.01 3.6 ± 0.0 0.011 ± 0.001 0.82 ± 0.09 < 6 ± 1 0.015 ± 0.007 15515500 08/30/05 23.8 ± 0.2 1.25 ± 0.01 4.1 ± 0.2 0.009 ± 0.002 0.82 ± 0.03 < 6 ± 1 0.018 ± 0.002 15565447 03/17/05 158.6 ± 2.4 0.77 ± 0.04 3.5 ± 0.5 0.008 ± 0.001 0.92 ± 0.00 < 6 ± 2 0.103 ± 0.005 15565447 05/17/05 77.5 ± 0.6 0.54 ± 0.02 1.5 ± 0.2 0.192 ± 0.013 2.03 ± 0.11 15 ± 3 0.213 ± 0.021 15565447 06/01/05 31.6 ± 0.2 0.59 ± 0.04 1.5 ± 0.1 0.109 ± 0.005 1.63 ± 0.00 11 ± 1 0.202 ± 0.001 15565447 06/14/05 21.7 ± 1.4 0.70 ± 0.04 1.8 ± 0.1 0.073 ± 0.001 1.12 ± 0.11 7 ± 3 0.156 ± 0.017 15565447 07/12/05 3.6 ± 0.3 1.11 ± 0.04 2.6 ± 0.1 0.047 ± 0.001 0.95 ± 0.06 9 ± 2 0.172 ± 0.005 15565447 08/16/05 4.0 ± 0.1 1.13 ± 0.03 2.5 ± 0.2 0.019 ± 0.002 1.01 ± 0.06 < 6 ± 1 0.100 ± 0.009 15565447 09/27/05 9.6 ± 0.1 0.81 ± 0.04 2.6 ± 0.2 0.078 ± 0.000 1.24 ± 0.07 < 6 ± 1 0.248 ± 0.011 

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 Sulfur Antimony Selenium Silica

μg/L μg/L mg/L μg/L μg/L mg/L

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

15356000 04/07/05 0.002 ± 0.000 0.84 ± 0.01 12 ± 0 0.10 ± 0.00 0.45 ± 0.08 6.4 ± 0.2 15356000 05/11/05 0.042 ± 0.000 0.84 ± 0.01 10 ± 0 0.13 ± 0.00 0.30 ± 0.05 4.8 ± 0.2 15356000 05/24/05 0.017 ± 0.000 0.80 ± 0.03 10 ± 0 0.16 ± 0.00 0.45 ± 0.06 5.2 ± 0.2 15356000 06/14/05 0.012 ± 0.000 0.62 ± 0.00 13 ± 0 0.16 ± 0.00 0.50 ± 0.04 6.0 ± 0.0 15356000 07/07/05 0.012 ± 0.002 1.68 ± 0.12 11 ± 0 0.20 ± 0.00 0.42 ± 0.07 6.4 ± 0.1 15356000 08/04/05 0.010 ± 0.001 1.24 ± 0.01 14 ± 0 0.16 ± 0.00 0.37 ± 0.06 7.4 ± 0.3 15356000 08/30/05 0.002 ± 0.000 1.52 ± 0.03 16 ± 0 0.18 ± 0.01 0.35 ± 0.05 6.0 ± 0.4 15389000 04/06/05 0.001 ± 0.000 0.34 ± 0.01 14 ± 0 0.06 ± 0.00 0.33 ± 0.09 4.2 ± 0.1 15389000 05/19/05 0.049 ± 0.001 0.36 ± 0.02 4 ± 0 0.06 ± 0.00 0.14 ± 0.04 1.8 ± 0.1 15389000 05/25/05 0.025 ± 0.000 0.37 ± 0.03 5 ± 0 0.08 ± 0.00 0.25 ± 0.11 2.1 ± 0.0 15389000 06/07/05 0.031 ± 0.002 0.27 ± 0.01 7 ± 0 0.08 ± 0.00 0.20 ± 0.02 2.6 ± 0.1 15389000 07/14/05 0.004 ± 0.000 0.33 ± 0.02 16 ± 0 0.08 ± 0.01 0.23 ± 0.07 2.6 ± 0.2 15389000 08/03/05 0.002 ± 0.000 0.34 ± 0.01 17 ± 1 0.08 ± 0.00 0.20 ± 0.07 2.7 ± 0.1 15389000 08/26/05 0.005 ± 0.000 0.33 ± 0.00 18 ± 1 0.08 ± 0.00 0.17 ± 0.06 2.6 ± 0.1 15453500 03/30/05 0.001 ± 0.000 0.88 ± 0.02 13 ± 0 0.09 ± 0.00 0.35 ± 0.04 6.9 ± 0.0 15453500 05/13/05 0.038 ± 0.000 1.17 ± 0.01 8 ± 0 0.13 ± 0.00 0.24 ± 0.08 3.7 ± 0.1 15453500 05/23/05 0.027 ± 0.001 0.80 ± 0.03 8 ± 0 0.15 ± 0.00 0.29 ± 0.02 3.8 ± 0.2 15453500 06/02/05 0.014 ± 0.000 0.84 ± 0.03 10 ± 0 0.16 ± 0.01 0.37 ± 0.01 4.8 ± 0.1 15453500 07/06/05 0.003 ± 0.000 1.32 ± 0.02 13 ± 0 0.19 ± 0.01 0.46 ± 0.03 5.7 ± 0.2 15453500 08/01/05 0.003 ± 0.000 1.50 ± 0.02 15 ± 1 0.18 ± 0.00 0.43 ± 0.06 6.3 ± 0.2 15453500 08/22/05 0.002 ± 0.000 1.97 ± 0.02 16 ± 0 0.23 ± 0.00 0.43 ± 0.20 6.0 ± 0.2 

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 Sulfur Antimony Selenium Silica

μg/L μg/L mg/L μg/L μg/L mg/L

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

15515500 03/31/05 0.001 ± 0.000 1.23 ± 0.00 14 ± 0 0.15 ± 0.01 0.54 ± 0.02 14.9 ± 0.1 15515500 05/10/05 0.012 ± 0.000 1.58 ± 0.03 13 ± 0 0.20 ± 0.01 0.37 ± 0.05 8.8 ± 0.2 15515500 05/18/05 0.006 ± 0.000 1.61 ± 0.01 16 ± 0 0.22 ± 0.00 0.49 ± 0.07 7.9 ± 0.2 15515500 05/27/05 0.003 ± 0.000 1.79 ± 0.12 16 ± 0 0.21 ± 0.00 0.53 ± 0.05 7.8 ± 0.1 15515500 07/12/05 0.002 ± 0.000 2.46 ± 0.22 17 ± 1 0.32 ± 0.00 0.60 ± 0.04 6.2 ± 0.2 15515500 08/05/05 0.004 ± 0.000 2.18 ± 0.06 19 ± 1 0.25 ± 0.01 0.55 ± 0.06 8.4 ± 0.3 15515500 08/05/05* 0.002 ± 0.000 2.14 ± 0.04 18 ± 0 0.25 ± 0.01 0.55 ± 0.09 7.9 ± 0.0 15515500 08/30/05 0.001 ± 0.000 2.10 ± 0.03 20 ± 1 0.28 ± 0.00 0.57 ± 0.07 8.1 ± 0.5 15565447 03/17/05 0.002 ± 0.000 1.39 ± 0.04 10 ± 0 0.09 ± 0.00 0.32 ± 0.06 12.0 ± 0.3 15565447 05/17/05 0.043 ± 0.003 1.28 ± 0.07 5 ± 0 0.20 ± 0.01 0.21 ± 0.10 4.4 ± 0.1 15565447 06/01/05 0.026 ± 0.002 1.03 ± 0.06 7 ± 0 0.24 ± 0.01 0.36 ± 0.12 4.3 ± 0.3 15565447 06/14/05 0.016 ± 0.001 1.05 ± 0.06 10 ± 0 0.27 ± 0.05 0.37 ± 0.04 5.2 ± 0.2 15565447 07/12/05 0.011 ± 0.001 1.48 ± 0.01 13 ± 1 0.28 ± 0.01 0.50 ± 0.04 6.5 ± 0.1 15565447 08/16/05 0.004 ± 0.000 1.55 ± 0.02 14 ± 0 0.24 ± 0.00 0.45 ± 0.03 6.1 ± 0.1 15565447 09/27/05 0.017 ± 0.000 1.04 ± 0.02 14 ± 0 0.20 ± 0.00 0.32 ± 0.13 7.4 ± 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 04/07/05 0.002 ± 0.000 157 ± 5 0.000 ± 0.000 < 0.006 ± 0.003 0.006 ± 0.001 < 0.006 ± 0.001 15356000 05/11/05 0.040 ± 0.003 112 ± 3 0.007 ± 0.000 < 0.006 ± 0.002 0.071 ± 0.003 0.016 ± 0.011 15356000 05/24/05 0.018 ± 0.000 108 ± 4 0.004 ± 0.000 < 0.006 ± 0.002 0.055 ± 0.002 < 0.006 ± 0.001 15356000 06/14/05 0.011 ± 0.001 126 ± 0 0.002 ± 0.000 < 0.003 ± 0.001 0.031 ± 0.004 < 0.004 ± 0.002 15356000 07/07/05 0.012 ± 0.001 126 ± 8 0.003 ± 0.000 < 0.006 ± 0.002 0.040 ± 0.012 0.010 ± 0.006 15356000 08/04/05 0.010 ± 0.001 140 ± 1 0.002 ± 0.000 < 0.006 ± 0.001 0.024 ± 0.003 < 0.006 ± 0.005 15356000 08/30/05 0.002 ± 0.001 152 ± 0 0.001 ± 0.000 < 0.006 ± 0.001 0.006 ± 0.000 < 0.006 ± 0.002 15389000 04/06/05 0.001 ± 0.000 156 ± 2 0.000 ± 0.000 < 0.006 ± 0.001 0.002 ± 0.001 0.013 ± 0.003 15389000 05/19/05 0.071 ± 0.001 43 ± 1 0.014 ± 0.000 < 0.006 ± 0.001 0.125 ± 0.003 0.007 ± 0.003 15389000 05/25/05 0.031 ± 0.001 53 ± 3 0.007 ± 0.000 < 0.006 ± 0.000 0.118 ± 0.012 0.12 ± 0.003 15389000 06/07/05 0.049 ± 0.008 64 ± 3 0.009 ± 0.001 < 0.006 ± 0.002 0.089 ± 0.011 0.006 ± 0.002 15389000 07/14/05 0.006 ± 0.001 126 ± 6 0.001 ± 0.000 < 0.006 ± 0.003 0.018 ± 0.006 0.008 ± 0.002 15389000 08/03/05 0.004 ± 0.000 130 ± 2 0.001 ± 0.000 < 0.006 ± 0.006 0.009 ± 0.000 0.007 ± 0.004 15389000 08/26/05 0.009 ± 0.001 126 ± 1 0.002 ± 0.000 < 0.006 ± 0.003 0.020 ± 0.000 0.008 ± 0.001 15453500 03/30/05 0.001 ± 0.000 163 ± 7 0.000 ± 0.000 < 0.006 ± 0.002 0.004 ± 0.002 < 0.006 ± 0.002 15453500 05/13/05 0.046 ± 0.002 88 ± 2 0.008 ± 0.000 < 0.006 ± 0.001 0.115 ± 0.003 < 0.006 ± 0.002 15453500 05/23/05 0.030 ± 0.001 85 ± 3 0.006 ± 0.000 < 0.006 ± 0.001 0.073 ± 0.005 < 0.006 ± 0.001 15453500 06/02/05 0.016 ± 0.002 100 ± 4 0.003 ± 0.000 < 0.006 ± 0.003 0.044 ± 0.004 < 0.006 ± 0.003 15453500 07/06/05 0.003 ± 0.001 137 ± 9 0.000 ± 0.000 < 0.006 ± 0.002 0.006 ± 0.000 0.027 ± 0.023 15453500 08/01/05 0.003 ± 0.001 144 ± 2 0.001 ± 0.000 < 0.006 ± 0.000 0.005 ± 0.002 < 0.006 ± 0.000 15453500 08/22/05 0.002 ± 0.000 150 ± 3 0.000 ± 0.000 < 0.006 ± 0.003 0.004 ± 0.003 < 0.006 ± 0.001 

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 03/31/05 0.001 ± 0.000 195 ± 5 0.000 ± 0.000 < 0.006 ± 0.004 0.007 ± 0.006 < 0.006 ± 0.000 15515500 05/10/05 0.011 ± 0.001 135 ± 1 0.002 ± 0.000 < 0.006 ± 0.001 0.023 ± 0.001 0.008 ± 0.003 15515500 05/18/05 0.006 ± 0.001 140 ± 4 0.001 ± 0.000 < 0.006 ± 0.001 0.019 ± 0.001 0.007 ± 0.006 15515500 05/27/05 0.003 ± 0.001 150 ± 9 0.001 ± 0.000 < 0.006 ± 0.001 0.010 ± 0.004 0.012 ± 0.006 15515500 07/12/05 0.002 ± 0.001 147 ± 12 0.001 ± 0.000 < 0.006 ± 0.002 0.006 ± 0.001 0.010 ± 0.002 15515500 08/05/05 0.004 ± 0.001 161 ± 0 0.001 ± 0.000 < 0.006 ± 0.002 0.008 ± 0.001 0.011 ± 0.002 15515500 08/05/05* 0.003 ± 0.000 156 ± 3 0.001 ± 0.000 < 0.006 ± 0.003 0.004 ± 0.001 0.008 ± 0.006 15515500 08/30/05 0.002 ± 0.001 169 ± 1 0.000 ± 0.000 < 0.006 ± 0.001 0.002 ± 0.001 < 0.006 ± 0.002 15565447 03/17/05 0.002 ± 0.000 190 ± 5 0.000 ± 0.000 < 0.006 ± 0.001 0.007 ± 0.003 0.007 ± 0.002 15565447 05/17/05 0.043 ± 0.002 86 ± 4 0.008 ± 0.000 < 0.006 ± 0.002 0.099 ± 0.015 0.012 ± 0.010 15565447 06/01/05 0.024 ± 0.000 90 ± 4 0.005 ± 0.000 < 0.006 ± 0.003 0.064 ± 0.008 0.009 ± 0.008 15565447 06/14/05 0.018 ± 0.003 102 ± 4 0.003 ± 0.000 < 0.006 ± 0.002 0.041 ± 0.005 0.009 ± 0.004 15565447 07/12/05 0.010 ± 0.002 129 ± 1 0.002 ± 0.000 < 0.006 ± 0.002 0.026 ± 0.009 0.009 ± 0.000 15565447 08/16/05 0.004 ± 0.000 142 ± 2 0.001 ± 0.000 < 0.006 ± 0.002 0.006 ± 0.001 < 0.006 ± 0.004 15565447 09/27/05 0.018 ± 0.000 129 ± 3 0.004 ± 0.000 < 0.006 ± 0.004 0.036 ± 0.002 < 0.006 ± 0.001 

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 Yttrium Ytterbium Zinc Zirconium

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 04/07/05 0.0003 ± 0.0000 1.05 ± 0.11 0.16 ± 0.06 0.02 ± 0.00 0.002 ± 0.000 1.5 ± 0.0 0.02 ± 0.00 15356000 05/11/05 0.0034 ± 0.0002 0.69 ± 0.03 0.35 ± 0.03 0.27 ± 0.00 0.021 ± 0.000 2.9 ± 0.1 0.18 ± 0.01 15356000 05/24/05 0.0019 ± 0.0001 0.62 ± 0.03 0.36 ± 0.03 0.15 ± 0.00 0.012 ± 0.001 1.0 ± 0.1 0.11 ± 0.01 15356000 06/14/05 0.0008 ± 0.0002 0.78 ± 0.01 0.47 ± 0.05 0.07 ± 0.00 0.006 ± 0.000 16.9 ± 0.1 0.15 ± 0.01 15356000 07/07/05 0.0016 ± 0.0002 0.82 ± 0.04 0.63 ± 0.04 0.11 ± 0.01 0.012 ± 0.000 0.9 ± 0.1 0.19 ± 0.01 15356000 08/04/05 0.0015 ± 0.0001 0.81 ± 0.03 0.54 ± 0.02 0.10 ± 0.00 0.008 ± 0.001 0.7 ± 0.1 0.17 ± 0.01 15356000 08/30/05 0.0005 ± 0.0001 0.88 ± 0.01 0.35 ± 0.03 0.03 ± 0.00 0.004 ± 0.000 0.5 ± 0.0 0.07 ± 0.01 15389000 04/06/05 0.0002 ± 0.0001 0.82 ± 0.06 < 0.04 ± 0.05 0.02 ± 0.00 0.001 ± 0.000 1.3 ± 0.1 0.03 ± 0.00 15389000 05/19/05 0.0048 ± 0.0001 0.23 ± 0.01 0.30 ± 0.02 0.46 ± 0.00 0.031 ± 0.001 2.8 ± 0.1 0.21 ± 0.02 15389000 05/25/05 0.0032 ± 0.0000 0.21 ± 0.01 0.28 ± 0.04 0.26 ± 0.01 0.021 ± 0.000 1.1 ± 0.2 0.31 ± 0.03 15389000 06/07/05 0.0034 ± 0.0001 0.21 ± 0.02 0.34 ± 0.03 0.33 ± 0.01 0.021 ± 0.000 1.2 ± 0.0 0.23 ± 0.01 15389000 07/14/05 0.0007 ± 0.0001 0.40 ± 0.05 0.17 ± 0.03 0.05 ± 0.00 0.003 ± 0.000 0.6 ± 0.1 0.11 ± 0.00 15389000 08/03/05 0.0005 ± 0.0001 0.44 ± 0.03 0.13 ± 0.02 0.04 ± 0.00 0.004 ± 0.000 0.3 ± 0.0 0.10 ± 0.01 15389000 08/26/05 0.0010 ± 0.0002 0.37 ± 0.01 0.10 ± 0.04 0.09 ± 0.00 0.007 ± 0.001 0.5 ± 0.0 0.15 ± 0.01 15453500 03/30/05 0.0002 ± 0.0001 0.94 ± 0.02 0.10 ± 0.03 0.02 ± 0.00 0.001 ± 0.000 0.6 ± 0.0 0.02 ± 0.00 15453500 05/13/05 0.0039 ± 0.0000 0.56 ± 0.03 0.45 ± 0.02 0.32 ± 0.00 0.025 ± 0.001 14.0 ± 0.1 0.26 ± 0.01 15453500 05/23/05 0.0032 ± 0.0004 0.54 ± 0.03 0.47 ± 0.04 0.23 ± 0.00 0.019 ± 0.001 1.6 ± 0.2 0.17 ± 0.01 15453500 06/02/05 0.0019 ± 0.0003 0.58 ± 0.06 0.44 ± 0.02 0.13 ± 0.01 0.012 ± 0.000 0.8 ± 0.1 0.11 ± 0.01 15453500 07/06/05 0.0003 ± 0.0001 0.77 ± 0.13 0.65 ± 0.01 0.03 ± 0.00 0.002 ± 0.000 2.6 ± 0.1 0.06 ± 0.01 15453500 08/01/05 0.0005 ± 0.0001 0.83 ± 0.05 0.58 ± 0.04 0.03 ± 0.00 0.003 ± 0.000 0.8 ± 0.0 0.07 ± 0.01 15453500 08/22/05 0.0004 ± 0.0001 0.81 ± 0.02 0.44 ± 0.00 0.02 ± 0.00 0.002 ± 0.000 1.8 ± 0.0 0.04 ± 0.00 

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 Yttrium Ytterbium Zinc Zirconium

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 03/31/05 0.0002 ± 0.0000 0.76 ± 0.04 0.21 ± 0.03 0.02 ± 0.00 0.002 ± 0.000 1.2 ± 0.0 0.03 ± 0.00 15515500 05/10/05 0.0013 ± 0.0000 0.66 ± 0.02 0.56 ± 0.04 0.10 ± 0.00 0.010 ± 0.000 1.1 ± 0.0 0.08 ± 0.01 15515500 05/18/05 0.0008 ± 0.0002 0.74 ± 0.05 0.42 ± 0.04 0.06 ± 0.00 0.005 ± 0.000 2.3 ± 0.0 0.06 ± 0.00 15515500 05/27/05 0.0004 ± 0.0001 0.78 ± 0.08 0.44 ± 0.03 0.03 ± 0.00 0.003 ± 0.000 2.6 ± 0.4 0.05 ± 0.01 15515500 07/12/05 0.0005 ± 0.0002 0.78 ± 0.11 0.52 ± 0.05 0.03 ± 0.00 0.003 ± 0.001 0.8 ± 0.1 0.04 ± 0.01 15515500 08/05/05 0.0006 ± 0.0001 0.79 ± 0.04 0.64 ± 0.06 0.04 ± 0.00 0.004 ± 0.001 0.6 ± 0.1 0.05 ± 0.00 15515500 08/05/05* 0.0005 ± 0.0001 0.78 ± 0.03 0.60 ± 0.03 0.03 ± 0.00 0.003 ± 0.000 0.3 ± 0.1 0.04 ± 0.01 15515500 08/30/05 0.0003 ± 0.0002 0.85 ± 0.02 0.53 ± 0.02 0.02 ± 0.00 0.002 ± 0.000 0.5 ± 0.0 0.04 ± 0.01 15565447 03/17/05 0.0004 ± 0.0001 0.76 ± 0.03 < 0.04 ± 0.03 0.03 ± 0.00 0.003 ± 0.000 2.4 ± 0.1 0.04 ± 0.00 15565447 05/17/05 0.0040 ± 0.0001 0.48 ± 0.05 0.73 ± 0.03 0.34 ± 0.00 0.026 ± 0.002 1.2 ± 0.1 0.27 ± 0.01 15565447 06/01/05 0.0026 ± 0.0001 0.46 ± 0.04 0.76 ± 0.07 0.20 ± 0.01 0.018 ± 0.000 0.5 ± 0.1 0.18 ± 0.03 15565447 06/14/05 0.0015 ± 0.0001 0.47 ± 0.05 0.73 ± 0.05 0.13 ± 0.01 0.011 ± 0.001 0.6 ± 0.0 0.15 ± 0.02 15565447 07/12/05 0.0010 ± 0.0001 0.69 ± 0.07 0.72 ± 0.04 0.07 ± 0.00 0.007 ± 0.001 0.9 ± 0.1 0.11 ± 0.03 15565447 08/16/05 0.0005 ± 0.0002 0.80 ± 0.03 0.53 ± 0.04 0.03 ± 0.00 0.002 ± 0.000 1.6 ± 0.0 0.04 ± 0.00 15565447 09/27/05 0.0019 ± 0.0002 0.70 ± 0.03 0.57 ± 0.04 0.13 ± 0.00 0.012 ± 0.001 1.8 ± 0.1 0.18 ± 0.01 

41
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 2005 are given in table 9. 

 42
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; *, relative standard deviation among replicate analyses greater than 10%; 

E, estimated] 

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) 

15356000 4/7/05 17:40 <0.04 0.48 <0.013 <0.139 

15356000 5/24/05 12:00 0.05 3.54 0.097 39.1 

15356000 6/14/05 12:20 <0.04 1.48 0.036 14.1 

15356000 7/7/05 11:00 <0.04 1.64* 0.081 33.7 

15356000 8/4/05 10:40 <0.04 1.73 <0.033 12.9 

15356000 8/30/05 11:00 <0.04 0.80 <0.036 11.7 

15389000 4/6/05 15:30 <0.04 0.37 <0.013 <0.143 

15389000 5/19/05 1300 0.04 4.64 0.095 12.7 

15389000 5/25/05 15:10 <0.04 3.86 0.067 11.2 

15389000 6/7/05 17:00 0.06 3.69 0.035 5.34 

15389000 8/3/05 13:30 <0.04 0.86 <0.017 0.152E 

15389000 8/26/05 13:00 <0.04 0.98 <0.014 0.277 

15453500 3/30/05 17:30 <0.04 0.16 <0.015 0.540 

15453500 5/13/05 11:15 0.05 4.63 0.209 46.5 

15453500 5/23/05 16:00 0.06 3.38* 0.146 35.2 

15453500 6/2/05 17:00 0.04 3.07 0.094 24.3 

15453500 7/6/05 17:30 <0.04 0.86 0.054 17.7 

15453500 8/1/05 16:00 <0.04 0.98 0.041 18.3 

15453500 8/22/05 17:20 <0.04 0.44 <0.048 32.1 

15515500 3/31/05 18:00 <0.04 0.19 <0.018 0.625 

15515500 5/10/05 18:00 <0.04 1.78 0.068 21.3 

15515500 5/18/05 16:30 <0.04 1.55 0.067 26.0 

15515500 5/27/05 15:00 <0.04 0.93 0.046 20.2 

15515500 7/12/05 14:30 <0.04 1.10 <0.062 53.1 

15515500 8/5/05 14:50 <0.04 0.93 0.079 31.6 

15565447 3/17/05 19:30 0.04 0.14 <0.050 <0.560 

15565447 5/17/05 10:30 <0.04 3.67 0.118 33.6 

15565447 6/1/05 12:00 0.04 2.52 0.083 24.3 

15565447 6/14/05 15:30 <0.04 1.62 0.076 17.8 

15565447 7/12/05 9:30 0.07 0.97 0.096 21.3 

15565447 8/16/05 18:20 <0.04 0.83 0.045 16.7 

15565447 9/27/05 14:50 <0.04 1.44 0.044 11.8 

 43
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 (PCO2) and methane (PCH4) is given in Schuster (2003). Sample analysis results for 

WY 2005 are given in table 10. 

 44
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] 

Station ID Date CO2 

(μmol/L) 

Corrected PCO2 

(μatmos) 

CH4 

(μmol/L) 

Corrected PCH4

(μatmos) 

DIC 

(μmol/L) 

15356000 4/7/2005 141.5 1,761 0.46 9.8 2,452 

15356000 5/4/2005 52.1 730 0.14 3.2 1,295 

15356000 5/11/2005 199.7 3,372 0.26 5.9 1,485 

15356000 5/24/2005 89.4 1,574 0.15 3.4 1,373 

15356000 6/14/2005 82.7 1,731 0.32 6.9 1,725 

15356000 7/7/2005 66.9 1,409 0.16 3.6 1,629 

15356000 8/4/2005 55.0 1,111 0.18 3.8 1,721 

15356000 8/30/2005 65.1 1,231 0.23 5.0 1,898 

15389000 4/6/2005 385.6 4,857 0.38 8.1 4,418 

15389000 5/19/2005 68.0 1,082 0.25 5.4 876 

15389000 5/25/2005 137.1 2,281 0.27 6.0 1,062 

15389000 6/7/2005 154.1 2,999 0.24 5.6 1,223 

15389000 7/14/2005 33.1 719 0.18 4.0 2,078 

15389000 8/3/2005 93.5 1,873 0.24 5.1 2,105 

15389000 8/26/2005 77.3 1,483 0.13 3.0 1,804 

15453500 3/30/2005 208.5 2,653 0.39 8.4 2,753 

15453500 5/23/2005 41.9 763 0.22 4.8 1,323 

15453500 6/2/2005 45.4 916 0.22 4.7 1,589 

15453500 7/6/2005 55.4 1,288 0.25 5.7 1,810 

15453500 8/1/2005 107.0 2,318 0.44 9.3 1,995 

15453500 8/22/2005 32.5 670 0.25 5.7 1,862 

15515500 3/31/2005 193.9 2,458 3.09 65.7 3,248 

15515500 5/10/2005 110.3 2,142 0.87 19.6 1,884 

15515500 5/18/2005 135.3 2,519 0.65 14.7 1,917 

15515500 5/27/2005 51.7 1,074 0.92 20.9 2,079 

15515500 7/12/2005 100.1 2,217 0.45 9.6 1,869 

15515500 8/5/2005 44.4 934 0.73 15.5 1,874 

15515500 8/30/2005 111.5 2,111 1.28 27.3 2,379 

15565447 3/17/2005 710.0 9,106 2.0 42.4 4,168 

15565447 5/17/2005 72.6 1,151 0.38 8.1 1,431 

15565447 6/1/2005 56.1 1,133 0.48 10.3 1,492 

15565447 6/14/2005 62.6 1,397 0.41 8.7 1,588 

15565447 7/12/2005 66.0 1,561 0.22 4.7 1,909 

15565447 8/16/2005 99.8 2,312 0.31 6.7 2,109 

15565447 9/27/2005 92.4 1,657 0.34 7.2 1,667 

 45
 46

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 2005 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; *, average value reported; <, 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 5/11/2005 10:30 375 0.9 29 18 130 1.9 15356000 (Set A) 5/24/2005 12:00 894 <0.5 29 11 120 0.7 15356000 (Set B) 5/24/2005 12:10 873 <0.5 31 12 130 0.8  15356000 6/14/2005 12:20 314 <0.5 32 7 120 0.7  15356000 7/7/2005 11:00 1,226 <0.5 38 10 92 0.4  15356000 8/4/2005 10:40 381 <0.5 37 22 98 0.3  15356000 8/30/2005 11:00 373 <0.5 38 13 100 0.4  15389000 5/19/2005 13:00 149 0.5 27 27 190 1.0  15389000 5/25/2005 15:10 160 <0.5 25 24 170 0.7  15389000 6/7/2005 17:00 68 <0.5 30 25 190 1.1 15389000 (Sets A & B)* 7/14/2005 14:30 36 <1.0 29 26 170 0.8  15453500 5/13/2005 11:15 1,032 0.6 32 14 120 0.6  15453500 5/23/2005 16:00 692 <0.5 44 14 130 0.8 15453500 (Set A) 6/2/2005 17:00 471 <0.5 33 14 130 0.7 15453500 (Set B) 6/2/2005 17:10 446 <0.5 34 15 130 0.7  15453500 7/6/2005 17:30 373 <0.5 40 10 120 0.6  15453500 8/1/2005 16:00 314 <1.0 39 16 120 0.5  15453500 8/22/2005 17:20 610 <0.5 50 23 120 0.5  15515500 3/31/2005 18:00 20 <0.5 57 12 130 0.7  15515500 5/10/2005 18:00 895 <0.5 32 13 75 0.5  15515500 5/18/2005 16:30 862 0.5 42 16 100 0.4  15515500 5/27/2005 15:00 690 <0.5 36 16 93 0.4  15515500 7/12/2005 14:30 2,382 <0.5 46 16 92 0.3  15515500 8/5/2005 14:50 1,223 <0.5 47 16 81 0.2  15515500 8/26/2005 14:10 1,214 <0.5 45 14 85 0.3  15565447 5/17/2005 10:30 862 <0.5 31 13 110 0.8 15565447 (Set A) 6/1/2005 12:00 586 <0.5 31 15 110 0.5 15565447 (Set B) 6/1/2005 12:10 600 <0.5 30 15 110 1.1  15565447 6/14/2005 15:30 393 <0.5 32 12 110 0.4  15565447 7/12/2005 9:30 454 <0.5 46 17 130 0.6  15565447 8/16/2005 18:20 271 <1.0 52 22 130 0.5  15565447 9/27/2005 14:50 276 <0.5 38 14 120 0.4 

47
Table 11. Sediment chemistry data from fixed-station sampling sites in the Yukon River Basin—Continued

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

 15356000 5/11/2005 10:30 84 14 44 1,000 130 24 1.5 3 15356000 (Set A) 5/24/2005 12:00 84 14 44 950 130 22 1.5 2 15356000 (Set B) 5/24/2005 12:10 84 14 44 970 140 23 1.6 2  15356000 6/14/2005 12:20 91 15 51 1,000 120 24 1.4 4  15356000 7/7/2005 11:00 87 17 42 730 130 22 1.4 2  15356000 8/4/2005 10:40 95 16 48 790 120 22 1.4 3  15356000 8/30/2005 11:00 88 17 48 740 130 26 1.4 3  15389000 5/19/2005 13:00 99 15 51 880 190 60 2.1 2  15389000 5/25/2005 15:10 100 16 52 770 170 58 2.2 3  15389000 6/7/2005 17:00 120 16 66 790 170 57 2.1 5 15389000 (Sets A & B)* 7/14/2005 14:30 110 15 60 830 150 54 1.8 5  15453500 5/13/2005 11:15 88 15 45 820 140 30 1.6 2  15453500 5/23/2005 16:00 86 16 46 870 140 28 1.6 2 15453500 (Set A) 6/2/2005 17:00 88 15 48 940 140 27 1.6 2 15453500 (Set B) 6/2/2005 17:10 93 16 49 960 140 28 1.6 3  15453500 7/6/2005 17:30 91 19 49 820 130 26 1.5 2  15453500 8/1/2005 16:00 110 17 63 870 130 25 1.5 5  15453500 8/22/2005 17:20 91 20 56 770 140 30 1.5 3  15515500 3/31/2005 18:00 96 18 52 240 110 21 1.3 3  15515500 5/10/2005 18:00 72 14 37 670 100 18 1.2 2  15515500 5/18/2005 16:30 87 18 44 810 130 24 1.5 2  15515500 5/27/2005 15:00 85 16 43 770 120 23 1.4 2  15515500 7/12/2005 14:30 83 17 40 900 120 23 1.5 2  15515500 8/5/2005 14:50 79 16 42 790 120 22 1.4 2  15515500 8/26/2005 14:10 81 16 42 850 120 22 1.4 2  15565447 5/17/2005 10:30 86 16 46 860 130 27 1.6 2 15565447 (Set A) 6/1/2005 12:00 85 16 44 870 130 29 1.6 2 15565447 (Set B) 6/1/2005 12:10 85 15 44 850 130 28 1.6 2  15565447 6/14/2005 15:30 90 16 45 920 130 28 1.5 2  15565447 7/12/2005 9:30 97 19 51 1,000 150 33 1.7 2  15565447 8/16/2005 18:20 110 21 59 1,000 150 33 1.7 3  15565447 9/27/2005 14:50 94 16 44 960 130 31 1.6 2 

48
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 5/11/2005 10:30 990 330 13 1.4 1.1 0.03 <50 <50 15356000 (Set A) 5/24/2005 12:00 1,000 350 13 1.4 0.7 0.03 <50 <50 15356000 (Set B) 5/24/2005 12:10 1,000 340 13 1.6 0.8 0.02 <50 <50  15356000 6/14/2005 12:20 860 310 10 1.2 0.6 0.05 <50 <50  15356000 7/7/2005 11:00 1,000 370 12 1.3 0.4 0.02 <50 <50  15356000 8/4/2005 10:40 930 380 11 1.4 0.4 <0.01 <50 <50  15356000 8/30/2005 11:00 910 370 11 1.4 0.4 <0.01 <50 <50  15389000 5/19/2005 13:00 1,000 130 15 1.4 1.3 0.08 <50 <50  15389000 5/25/2005 15:10 1,000 140 16 1.0 1.3 0.07 <50 <50  15389000 6/7/2005 17:00 980 170 14 1.0 1.3 0.07 <50 <50 15389000 (Sets A & B)* 7/14/2005 14:30 850 220 14 0.9 1.5 <0.02 <100 <100  15453500 5/13/2005 11:15 1,100 290 12 1.2 0.8 0.03 <50 <50  15453500 5/23/2005 16:00 1,100 300 13 1.5 0.8 0.06 <50 <50 15453500 (Set A) 6/2/2005 17:00 1,000 310 13 1.5 0.8 0.04 <50 <50 15453500 (Set B) 6/2/2005 17:10 1,100 320 14 1.6 0.9 0.05 <50 <50  15453500 7/6/2005 17:30 990 300 12 1.5 0.4 0.07 <50 <50  15453500 8/1/2005 16:00 920 340 11 1.4 0.5 <0.02 <100 <100  15453500 8/22/2005 17:20 960 320 13 1.7 0.5 <0.01 <50 <50  15515500 3/31/2005 18:00 1,000 320 38 1.5 0.9 <0.01 <50 <50  15515500 5/10/2005 18:00 660 240 11 1.2 0.4 0.03 <50 <50  15515500 5/18/2005 16:30 760 250 15 1.5 0.5 0.03 <50 <50  15515500 5/27/2005 15:00 710 240 14 1.3 0.5 0.05 <50 <50  15515500 7/12/2005 14:30 720 260 14 1.2 0.4 0.02 <50 <50  15515500 8/5/2005 14:50 710 270 13 1.1 0.3 <0.01 <50 <50  15515500 8/26/2005 14:10 760 280 11 1.1 0.4 0.01 <50 <50  15565447 5/17/2005 10:30 930 250 14 1.4 0.5 0.05 <50 <50 15565447 (Set A) 6/1/2005 12:00 910 240 13 1.3 0.6 0.05 <50 <50 15565447 (Set B) 6/1/2005 12:10 880 240 13 1.3 0.6 0.06 <50 <50  15565447 6/14/2005 15:30 870 230 13 1.2 0.5 0.05 <50 <50  15565447 7/12/2005 9:30 920 270 17 1.7 0.6 <0.01 <50 <50  15565447 8/16/2005 18:20 920 290 19 1.8 0.6 0.04 <100 <100  15565447 9/27/2005 14:50 850 260 15 1.4 0.7 0.04 <50 <50 

49
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 5/11/2005 10:30 3.7 820 6.5 0.45 1.0 2.0 0.10  15356000 5/24/2005 12:00 3.7 750 6.3 0.46 0.7 2.2 0.05 15356000 (Set A) 5/24/2005 12:10 3.8 770 6.5 0.46 0.6 2.1 0.05 15356000 (Set B) 6/14/2005 12:20 3.5 690 6.1 0.4 0.9 2.2 0.08  15356000 7/7/2005 11:00 4.3 780 6.8 0.47 0.6 2.6 0.04  15356000 8/4/2005 10:40 4.2 770 6.7 0.45 1.0 2.8 0.08  15356000 8/30/2005 11:00 4.3 750 6.7 0.44 0.6 2.1 0.07  15389000 5/19/2005 13:00 3.8 680 7.0 0.43 3.3 3.7 0.30  15389000 5/25/2005 15:10 3.9 630 7.0 0.43 3.3 3.8 0.30  15389000 6/7/2005 17:00 3.8 690 6.7 0.43 3.6 4.1 0.31  15389000 7/14/2005 14:30 3.5 1,200 5.9 0.36 3.4 4.8 0.34  15453500 5/13/2005 11:15 3.9 790 6.6 0.47 1.2 2.3 0.12  15453500 5/23/2005 16:00 4.1 790 6.6 0.46 1.2 2.4 0.10  15453500 6/2/2005 17:00 4.0 790 6.5 0.46 1.3 2.5 0.10  15453500 6/2/2005 17:10 4.0 820 6.7 0.48 1.3 2.5 0.09  15453500 7/6/2005 17:30 4.3 780 6.6 0.46 1.1 2.6 0.08  15453500 8/1/2005 16:00 4.0 810 6.3 0.42 1.1 2.8 0.09  15453500 8/22/2005 17:20 4.9 840 7.0 0.46 0.6 2.6 0.05  15515500 3/31/2005 18:00 5.1 3,200 6.2 0.35 1.3 2.3 0.17  15515500 5/10/2005 18:00 3.3 650 6.2 0.37 0.5 0.6 0.03  15515500 5/18/2005 16:30 4.1 790 7.1 0.43 0.5 0.8 0.05  15515500 5/27/2005 15:00 3.8 750 6.8 0.42 0.7 0.8 0.04  15515500 7/12/2005 14:30 4.1 760 7.2 0.43 0.3 0.7 0.02  15515500 8/5/2005 14:50 4.0 720 7.0 0.40 0.5 0.6 0.03  15515500 8/26/2005 14:10 4.0 750 7.1 0.42 0.3 0.7 0.03  15565447 5/17/2005 10:30 4.0 780 6.7 0.44 1.0 1.4 0.08  15565447 6/1/2005 12:00 3.9 750 6.7 0.43 1.1 1.4 0.08  15565447 6/1/2005 12:10 3.9 750 6.7 0.45 1.1 1.5 0.08  15565447 6/14/2005 15:30 3.8 730 6.5 0.43 1.3 1.7 0.10  15565447 7/12/2005 9:30 4.6 900 7.4 0.45 1.1 1.9 0.08  15565447 8/16/2005 18:20 4.8 1,000 7.4 0.44 0.9 1.9 0.09  15565447 9/27/2005 14:50 4.1 710 7.0 0.46 1.2 1.9 0.11 

50
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 2005 are given 

in table 12. 

51
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 15356000 

Date: 5/11/05 5/24/05 5/24/05 6/14/05 7/7/06 8/4/06 8/30/06 

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

Non-clays: 

Quartz 30.6 26.7 27.3 28.1 17.9 19.5 15.8 

Ordered Microcline 1.8 0.6 1.9 0.6 0.0 1.5 0.9 

Intermediate 

Microcline 3.3 4.6 3.2 4.4 7.0 4.5 5.3 

Sanidine 1.3 0.2 0.5 1.7 0.0 0.0 0.0 

Orthoclase 0.0 0.0 0.0 0.0 0.0 0.0 0.0 

Anorthoclase 14.7 17.9 13.2 10.3 20.1 20.5 22.7 

Albite 7.2 6.5 7.0 6.0 6.6 7.0 7.3 

Oligoclase 1.4 1.3 1.4 2.8 0.0 0.7 0.1 

Andesine 0.5 0.0 0.9 2.2 0.0 1.9 0.0 

Labradorite 7.8 5.9 7.5 6.2 7.2 5.2 3.9 

Bytownite 1.5 2.0 2.4 1.1 2.8 1.5 0.9 

Anorthite 0.5 0.6 0.0 0.4 0.0 0.0 0.3 

Calcite 2.3 5.2 5.5 6.1 10.2 9.6 13.6 

Mg-calcite 0.7 0.6 0.5 0.4 0.0 0.0 0.4 

Dolomite 2.6 3.1 3.0 2.5 3.8 3.3 4.2 

Amphibole 1.4 1.0 1.1 1.8 0.9 1.1 1.6 

Pyroxene 1.5 0.7 1.5 1.0 2.1 2.5 0.5 

Hematite 0.1 0.2 0.3 0.1 0.4 0.3 0.2 

Maghemite 1.1 0.4 0.4 1.4 0.4 0.5 0.0 

Apatite 1.0 0.2 0.4 1.0 0.1 0.6 0.6 

Total non-clays: 81.3 77.9 78.0 78.0 79.5 80.2 78.2 

Clays:

Goethite 0.2 0.0 0.1 0.4 0.0 0.1 0.0 

Disordered Kaolinite 0.6 0.5 0.4 0.7 0.6 1.0 0.4 

Ferruginous smectite 7.4 9.5 6.1 4.9 9.4 10.6 12.4 

Illite + Smectite 6.8 4.8 5.2 6.6 6.6 5.5 4.9 

Chlorite 7.8 7.4 7.4 9.5 11.0 10.0 13.6 

Muscovite (2M1) 4.5 3.2 4.7 4.3 0.8 2.9 3.0 

Total clays: 27.2 25.4 23.8 26.3 28.4 30.0 34.3 

Total: 108.5 103.2 101.9 104.4 108.0 110.3 112.5 

Full Pattern degree of 

fit: 0.101 0.094 0.079 0.119 0.091 0.089 0.100 

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

Continued 

Station ID: 15453500 15453500 15453500 15453500* 15453500 15453500 15453500 

Date: 5/13/05 5/23/05 6/2/05 6/2/05 7/6/05 8/1/05 8/22/05 

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

Non-clays: 

Quartz 30.2 26.8 27.9 28.6 21.3 20.9 11.9 

Ordered Microcline 1.7 1.3 1.2 1.5 1.1 0.0 0.5 

Intermediate 

Microcline 2.0 3.4 3.5 3.7 3.4 6.8 4.5 

Sanidine 0.8 0.9 0.8 0.4 0.3 0.0 0.0 

Orthoclase 0.0 0.0 0.0 0.0 0.0 0.0 0.0 

Anorthoclase 15.1 14.5 14.7 13.1 14.4 18.3 15.2 

Albite 6.1 6.6 6.0 6.1 5.9 4.5 5.6 

Oligoclase 0.0 0.9 1.3 1.1 1.1 2.0 0.9 

Andesine 0.0 0.0 1.1 0.0 0.0 0.0 1.0 

Labradorite 5.8 5.2 5.3 5.5 6.0 4.9 4.9 

Bytownite 1.6 1.4 1.4 2.6 1.2 1.7 0.1 

Anorthite 0.7 0.3 0.6 0.0 0.9 0.0 1.2 

Calcite 3.4 4.5 4.7 4.6 9.2 7.7 11.2 

Mg-calcite 0.4 0.3 0.4 0.5 0.3 1.0 0.7 

Dolomite 3.1 3.5 3.1 3.3 3.3 2.9 3.6 

Amphibole 1.0 1.2 1.1 0.9 0.9 1.0 1.1 

Pyroxene 1.4 0.8 0.7 0.8 1.2 0.0 0.6 

Hematite 0.3 0.3 0.2 0.3 0.2 0.4 0.4 

Maghemite 0.1 0.6 0.2 0.7 1.2 0.0 0.6 

Apatite 0.4 0.6 0.8 0.3 0.3 0.7 0.8 

Total non-clays: 74.1 73.1 75.0 74.2 72.1 72.6 64.7 

Clays: 

Goethite 0.1 0.1 0.3 0.1 0.1 0.3 0.1 

Disordered Kaolinite 0.6 0.9 0.3 0.7 0.9 0.6 0.7 

Ferruginous smectite 7.0 6.8 7.1 7.9 7.6 16.4 15.7 

Illite + Smectite 10.2 7.7 8.1 7.9 6.8 1.2 3.2 

Chlorite 8.0 9.5 9.6 9.4 10.7 10.8 12.2 

Muscovite (2M1) 4.1 6.0 5.2 4.8 4.1 4.8 5.1 

Total clays: 30.1 31.0 30.7 30.8 30.2 34.1 37.0 

Total: 104.2 104.1 105.6 105.0 102.4 106.8 101.7 

Full Pattern degree of 

fit: 0.074 0.086 0.102 0.080 0.072 0.129 0.102 

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

Continued 

Station ID: 15515500 15515500 15515500 15515500 15515500 15515500 

Date: 5/10/05 5/18/05 5/27/05 7/12/05 8/5/05 8/26/05 

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

Non-clays:

Quartz 43.8 36.5 37.4 32.6 31.2 36.3 

Ordered Microcline 1.0 1.1 1.0 0.3 0.6 0.4 

Intermediate Microcline 2.7 2.7 2.8 3.8 3.6 3.8 

Sanidine 0.8 0.0 0.0 0.0 0.4 0.0 

Orthoclase 0.0 0.0 0.0 0.0 0.0 0.0 

Anorthoclase 9.0 10.8 10.4 14.2 13.8 16.1 

Albite 8.0 7.3 6.8 6.5 6.7 7.5 

Oligoclase 2.5 1.4 1.7 0.9 1.2 0.0 

Andesine 1.0 0.0 1.8 0.0 0.0 0.5 

Labradorite 6.1 6.0 5.1 6.6 7.0 6.4 

Bytownite 2.0 1.3 1.8 0.8 2.1 2.1 

Anorthite 1.7 1.1 0.4 1.9 2.6 0.8 

Calcite 0.5 1.0 0.5 1.0 0.8 1.2 

Mg-calcite 0.4 0.2 0.5 0.3 0.2 0.0 

Dolomite 0.4 0.3 0.4 0.1 0.3 0.2 

Amphibole 1.2 1.0 1.3 1.0 0.4 0.6 

Pyroxene 0.7 0.9 0.3 0.0 0.6 1.2 

Hematite 0.1 0.1 0.2 0.0 0.2 0.2 

Maghemite 0.0 0.0 0.0 0.0 0.0 0.0 

Apatite 0.0 0.1 0.0 0.4 0.2 0.1 

Total non-clays: 81.8 72.0 72.4 70.3 72.0 77.5 

Clays:

Goethite 0.2 0.2 0.3 0.4 0.4 0.3 

Disordered Kaolinite 0.4 0.3 0.3 0.6 1.0 1.8 

Ferruginous smectite 6.4 6.7 6.9 11.4 10.7 10.1 

Illite + Smectite 0.0 0.0 0.0 0.0 0.0 0.0 

Chlorite 8.9 10.9 10.1 8.7 8.1 8.2 

Muscovite (2M1) 9.2 12.4 12.9 14.6 12.9 11.3 

Total clays: 25.3 30.5 30.4 35.8 33.0 31.8 

Total: 107.1 102.5 102.8 106.1 105.0 109.2 

Full Pattern degree of fit: 0.094 0.082 0.081 0.114 0.102 0.097 

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

Continued 

Station ID: 15565447 15565447 15565447* 15565447 15565447 15565447 

Date: 5/17/05 6/1/05 6/1/05 6/14/05 7/12/05 8/16/05 

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

Non-clays: 

Quartz 34.4 35.4 36.5 35.2 26.7 21.9 

Ordered Microcline 1.9 1.1 0.9 1.1 0.0 0.1 

Intermediate Microcline 2.7 3.6 3.7 3.5 6.3 5.3 

Sanidine 0.6 0.7 0.5 1.0 0.3 0.1 

Orthoclase 0.0 0.0 0.0 0.0 0.0 0.0 

Anorthoclase 13.0 10.0 11.1 10.7 11.3 14.8 

Albite 7.2 6.5 7.1 6.5 5.9 5.4 

Oligoclase 2.1 2.1 1.8 1.3 3.5 2.3 

Andesine 0.0 1.8 0.0 0.0 0.8 0.0 

Labradorite 3.5 5.1 3.5 4.9 3.2 4.7 

Bytownite 1.8 0.3 1.9 2.3 0.6 0.8 

Anorthite 1.0 0.9 0.8 0.0 0.7 1.5 

Calcite 0.1 0.3 0.2 0.8 2.9 4.4 

Mg-calcite 0.1 0.5 0.0 0.2 0.4 0.0 

Dolomite 1.6 1.3 1.2 1.4 2.3 1.5 

Amphibole 0.6 1.0 1.0 0.6 1.5 0.6 

Pyroxene 0.6 0.0 0.8 0.8 0.1 0.0 

Hematite 0.2 0.1 0.1 0.3 0.0 0.5 

Maghemite 1.0 0.0 0.0 0.0 1.3 0.0 

Apatite 0.4 0.6 0.3 0.3 1.2 0.0 

Total non-clays: 72.7 71.1 71.5 70.7 68.6 64.0 

Clays: 

Goethite 0.2 0.4 0.2 0.3 0.1 0.0 

Disordered Kaolinite 1.2 0.7 0.7 0.8 0.2 2.0 

Ferruginous smectite 6.1 7.6 6.3 7.9 13.7 15.6 

Illite + Smectite 4.4 5.5 3.5 2.5 4.6 2.3 

Chlorite 11.3 10.9 10.9 10.7 13.0 14.3 

Muscovite (2M1) 9.1 9.2 8.2 10.4 12.1 11.9 

Total clays: 32.3 34.2 29.7 32.6 43.7 46.1 

Total: 105.0 105.4 101.2 103.3 112.3 110.1 

Full Pattern degree of fit: 0.077 0.103 0.076 0.085 0.148 0.097 

55
CHAPTER 9 – Sediment Concentration and Percent Organic Matter 

by Paul F. Schuster and Michael M. Reddy 

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

concentration and percent organic matter (OM) in the sediment is given in Schuster (2003). Sample 

analysis results for WY 2005 are given in table 13. 

56
Table 13. Suspended sediment concentrations and percent organic matter in sediment 

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; OM, Organic Matter; --, missing data; <, less than; *, replicate] 

Station ID Date 

Sediment 

concentration

(mg/L) 

Percent 

OM in 

sediment 

15356000 4/7/2005 1 93 

15356000 5/11/2005 194 8 

15356000 5/24/2005 390 7 

15356000 6/14/2005 217 6 

15356000 7/7/2005 1,019 5 

15356000 8/4/2005 232 9 

15356000 8/30/2005 237 9 

15389000 4/6/2005 <1 -- 

15389000 5/19/2005 -- -- 

15389000 5/25/2005 116 15 

15389000 6/7/2005 52 14 

15389000 7/14/2005 21 19 

15389000 8/3/2005 <1 -- 

15389000 8/26/2005 <1 -- 

15453500 3/30/2005 14 14 

15453500 5/13/2005 667 7 

15453500 5/23/2005 576 6 

15453500 6/2/2005 322 7 

15453500* 6/2/2005 364 8 

15453500 7/6/2005 384 6 

15453500 8/1/2005 185 8 

15453500 8/22/2005 375 12 

15515500 3/31/2005 14 11 

15515500 5/10/2005 426 4 

15515500 5/18/2005 364 5 

15515500 5/27/2005 247 7 

15515500 7/12/2005 1,812 3 

15515500 8/5/2005 772 4 

 15515500* 8/5/2005 825 4 

15515500 8/30/2005 636 4 

15565447 9/27/2005 71 11 

15453500 3/30/2005 14 14 

15453500 5/13/2005 667 7 

15453500 5/23/2005 576 6 

15453500 6/2/2005 322 7 

15453500 6/2/2005 364 8 

15453500 7/6/2005 384 6 

57
CHAPTER 10 – Total Particulate Carbon, Particulate Inorganic Carbon, 

Particulate Organic Carbon, and Total Particulate Nitrogen 

by Paul F. Schuster and Michael M. Reddy 

A description of sample collection and processing of samples for total particulate carbon 

(TPC) and total particulate nitrogen (TPN) concentrations, also referred to as particulate carbon (PC) 

and particulate nitrogen (PN), respectively, is given in Schuster (2003). Duplicate samples are 

required for the determination of particulate inorganic carbon (PIC) and particulate organic carbon 

(POC). The first duplicate was analyzed for TPC (Zimmerman and others, 1997). The second 

duplicate was combusted at 500° C to remove all the POC. The second duplicate was then analyzed 

for PIC (Zimmerman and others, 1997). POC was determined by the difference of TPC and PIC. 

Sample analysis results for WY 2005 are given in table 14. 

58
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; <, less than; 

*, replicate; concentrations averaged from duplicate samples; --, missing data] 

Station ID Date TPC 

(mg/L) 

PIC 

(mg/L) 

POC 

(mg/L) 

TPN 

 (mg/L) 

15356000 4/7/2005 0.19 <0.076 -- <0.012 

15356000 5/11/2005 6.19 1.15 5.04 0.282 

15356000 5/24/2005 12.40 3.81 8.59 0.401 

15356000 6/14/2005 4.28 2.03 2.25 0.141 

15356000 7/7/2005 28.20 16.60 11.60 0.549 

15356000 8/4/2005 7.82 3.08 4.74 0.220 

15356000 8/30/2005 7.51 3.63 3.88 0.144 

15389000 4/6/2005 <0.076 <0.076 -- <0.012 

15389000 5/19/2005 -- -- -- -- 

15389000 5/25/2005 4.77 0.15 4.62 0.381 

15389000 6/7/2005 2.38 0.14 2.24 0.180 

15389000 7/14/2005 1.41 <0.076 -- 0.131 

15389000 8/3/2005 0.19 <0.076 -- 0.025 

15389000 8/26/2005 0.39 <0.076 -- 0.032 

15453500 3/30/2005 0.51 <0.076 -- 0.025 

15453500 5/13/2005 17.90 5.67 12.23 0.805 

15453500 5/23/2005 17.00 4.56 12.44 0.588 

15453500 6/2/2005 10.50 2.69 7.81 0.375 

15453500* 6/2/2005 9.63 2.80 6.83 0.365 

15453500 7/6/2005 9.99 4.08 5.91 0.269 

15453500 8/1/2005 6.66 2.75 3.91 0.206 

15453500 8/22/2005 13.90 6.54 7.36 0.309 

15515500 3/31/2005 0.33 <0.076 -- 0.021 

15515500 5/10/2005 3.86 0.41 3.45 0.265 

15515500 5/18/2005 4.55 0.29 4.26 0.262 

15515500 5/27/2005 3.43 0.27 3.16 0.186 

15515500 7/12/2005 8.89 1.86 7.03 0.394 

15515500 8/5/2005 7.94 0.59 7.35 0.397 

15515500* 8/5/2005 8.44 1.30 7.14 0.408 

15515500 8/30/2005 6.09 0.87 5.22 0.356 

15565447 3/17/2005 0.52 <0.076 -- 0.040 

15565447 5/17/2005 11.70 0.58 11.12 0.596 

15565447 6/1/2005 9.74 0.61 9.13 0.495 

15565447 6/14/2005 5.71 0.52 5.19 0.340 

15565447 7/12/2005 8.92 1.19 7.73 0.438 

15565447 8/16/2005 5.05 1.08 3.97 0.220 

15565447 9/27/2005 6.42 0.18 6.24 0.408 

59
CHAPTER 11 - Isotopic Analysis of Suspended Particulate Organic Matter 

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 particulate 

organic matter (POM) is given in Schuster (2003). Sample analysis results for WY 2005 are given 

in table 15. 

60
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; %, percent; δ, delta; *, replicate] 

Station ID Date % C % N C:N δ

13C δ15N 

15356000 5/11/2005 1.03 0.08 15.02 -25.10 0.13

15356000 6/14/2005 0.92 0.11 9.76 -25.35 6.12

15356000 7/7/2005 0.62 0.05 14.47 -25.43 3.23

15356000 8/4/2005 1.00 0.13 8.97 -24.95 7.85

15356000 8/30/2005 0.66 0.07 11.00 -25.14 3.93

15389000 5/19/2005 3.55 0.30 13.81 -26.12 1.43

15389000 5/25/2005 3.17 0.27 13.70 -26.04 2.47

15389000 7/14/2005 3.58 0.49 8.52 -26.72 6.34

15453500 5/13/2005 1.23 0.11 13.05 -25.77 2.56

15453500 5/23/2005 1.21 0.11 12.83 -26.41 0.98

15453500 7/6/2005 1.10 0.09 14.26 -24.99 1.66

15453500 8/1/2005 1.12 0.15 8.71 -26.22 6.03

15515500 3/31/2005 1.52 0.25 7.09 -25.57 4.30

15515500 5/10/2005 0.51 0.04 14.88 -25.18 1.91

15515500 5/18/2005 0.44 0.05 10.27 -26.11 6.45

15515500 5/27/2005 0.77 0.05 17.97 -24.99 1.46

15515500 7/12/2005 0.37 0.04 10.79 -25.63 3.89

15515500 8/5/2005 0.38 0.04 11.08 -25.76 3.42

15515500 8/26/2005 0.39 0.04 11.38 -23.92 4.35

15565447 5/17/2005 1.16 0.08 16.92 -25.88 0.25

15565447 6/1/2005 1.34 0.10 15.63 -25.69 1.59

15565447* 6/1/2005 1.05 0.08 15.31 -26.29 0.70

15565447 6/14/2005 1.17 0.15 9.10 -26.08 6.38

15565447 7/12/2005 1.13 0.14 9.42 -26.60 6.59

15565447 8/16/2005 1.04 0.14 8.67 -26.12 5.98

15565447 9/27/2005 1.64 0.09 21.26 -26.50 5.20

61
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 2005 are given in 

table 16. 

62
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; +, plus or minus; *, replicate] 

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

(μg/L) (±1 sigma uncertainty) 

15356000 04/07/05 17:40 1.16 1.397±0.008 

15356000 05/11/05 10:30 0.78 1.451±0.017 

15356000 05/24/05 12:00 0.6 1.391±0.011 

15356000 06/14/05 12:20 0.85 1.361±0.013 

15356000 07/07/05 11:00 0.91 1.39±0.009 

15356000 08/04/05 10:40 0.96 1.37±0.011 

15356000 08/30/05 11:00 1.04 1.373±0.01 

15389000 04/06/05 15:40 0.85 2.415±0.021 

15389000 05/19/05 12:00 0.25 1.689±0.020 

15389000 05/25/05 15;10 0.27 1.949±0.026 

15389000 06/07/05 17;00 0.25 1.701±0.015 

15389000 07/14/05 14;30 0.43 2.089±0.025 

15389000 08/03/05 13;30 0.47 2.195±0.029 

15389000 08/26/05 13;30 0.42 2.174±0.023 

15453500 03/31/05 17;30 1.07 1.436±0.01 

15453500 05/13/05 11;15 0.58 1.501±0.01 

15453500 05/23/05 16;00 0.63 1.431±0.01 

15453500 06/02/05 17;00 0.69 1.325±0.02 

15453500 07/06/05 17;30 0.94 1.429±0.006 

15453500 08/01/05 16;00 0.93 1.379±0.008 

15453500 08/22/05 17;20 0.99 1.404±0.014 

15515500 03/31/05 18;00 0.85 1.331±0.008 

15515500 05/10/05 18;00 0.75 1.299±0.006 

15515500 05/18/05 16;30 0.83 1.216±0.010 

15515500 05/27/05 15;00 1.00 1.177±0.018 

15515500 07/12/05 14;30 0.94 1.154±0.011 

15515500 08/05/05 14;50 0.90 1.206±0.009 

15515500* 08/05/05 15;00 0.88 1.203±0.008 

15515500 08/30/05 14;10 1.02 1.204±0.012 

15565447 03/17/05 19;30 0.72 1.396±0.01 

15565447 05/17/05 10;30 0.56 1.315±0.01 

15565447 06/01/05 12;00 0.51 1.354±0.01 

15565447 06/14/05 15;30 0.56 1.34±0.02 

15565447 07/12/05 09;30 0.83 1.329±0.01 

15565447 08/16/05 18;20 0.99 1.286±0.01 

15565447 09/27/05 14;50 0.82 1.356±0.013 

63
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