# Elements by ICP (7300)

​Esta página en Español ELEMENTS by ICP (Nitric/Perchloric Acid Ashing) MW: Table 1
CAS: Table 2
METHOD: 7300, Issue 3
7300
RTECS: Table 2
EVALUATION: PARTIAL
Issue 1: 15 August 1990 Issue 3: 15 March 2003
PROPERTIES: Table 1
OSHA: Table 2 NIOSH: Table 2 ACGIH: Table 2 ELEMENTS: aluminum* antimony* arsenic barium beryllium* cadmium
calcium lanthanum nickel chromium* lithium* potassium cobalt* magnesium phosphorus copper manganese* selenium iron molybdenum* silver lead* of these elements require special sample treatment.
SAMPLING
strontium tellurium tin thallium titanium
tungsten* vanadium* yittrium zinc zirconium*
MEASUREMENT
SAMPLER:
FILTER (0.8-µm, cellulose ester membrane, or 5.0-µm, polyvinyl chloride membrane)
TECHNIQUE:
INDUCTIVELY COUPLED ARGON PLASMA, ATOMIC EMISSION SPECTROSCOPY (ICP-AES)
FLOWRATE:
1 to 4 L/min
ANALYTE:
elements above
VOL-MIN: -MAX:
Table 1 Table 1
ASHING REAGENTS:
SHIPMENT:
routine CONDITIONS:
SAMPLE STABILITY:
stable
BLANKS:
2 to 10 field blanks per set
ACCURACY
conc. HNO3 / conc. HClO4 (4:1), 5 mL; 2mL increments added as needed room temperature, 30 min; 150 °C to near dryness
FINAL SOLUTION:
4% HNO3 , 1% HClO4 , 25 mL
WAVELENGTH:
depends upon element; Table 3
BACKGROUND CORRECTION:
spectral wavelength shift
RANGE STUDIED:
not determined
CALIBRATION:
elements in 4% HNO 3 , 1% HClO4
BIAS:
not determined
RANGE:
varies with element [1]
OVERALL PRECISION (Ö r T ):
not determined
ACCURACY:
not determined
ESTIMATED LOD: Tables 3 and 4 PRECISION ( þ ):
Tables 3 and 4
APPLICABILITY: The working range of this method is 0.005 to 2.0 mg/m3 for each element in a 500-L air sample. This is simultaneous elemental analysis, not compound specific. Verify that the types of compounds in the samples are soluble with the ashing procedure selected.
INTERFERENCES: Spectral interferences are the primary interferences encountered in ICP-AES analysis. These are minimized by judicious wavelength selection, interelement correction factors and background correction [1-4].
OTHER METHODS: This issue updates issues 1 and 2 of Method 7300, which replaced P&CAM 351 [3] for trace elements. Flame atomic absorption spectroscopy (e.g., Methods 70XX) is an alternate analytical technique for many of these elements. Graphite furnace AAS (e.g., 7102 for Be, 7105 for Pb) is more sensitive.
NIOSH Manual of Analytical Methods (NMAM), Fourth Edition ​ELEM ENT S (ICP): ME TH OD 7300, Issue 3, dated 1 5 March 2003 - Page 2 of 8 REAGENTS:
EQUIPMENT:
1. Nitric acid (HNO 3), conc., ultra pure. 2. Pe rchloric acid (H ClO 4), con c., ultra p ure.* 3. Ashing acid: 4:1 (v/v) HNO 3:HClO 4. Mix 4 volumes conc. HNO 3 with 1 volume conc. HClO 4. 4. Ca libration s tock solutions, 1000 µg/m L. Com mercially available, or prepared per instrument manufacturer's recomm endation (see step 12 ). 5. Dilution acid, 4% HNO 3, 1% HC lO 4. Add 50 mL ashing acid to 600 mL water; dilute to 1 L. 6. Argon. 7. Distilled,deionized water.
1. Sam pler: cellulose ester m em brane filter, 0.8-µm pore size; or polyvinyl chloride m em brane, 5.0-µm pore size; 37-m m diam eter, in cassette filter holder. 2. Personal sa m pling pum p, 1 to 4 L/m in, with flexible connecting tubing. 3. Inductively coupled plasma-atomic emission spectrometer, equipped as specified by the manufacturer for analysis of elements of interest. 4. Regulator, two-stage, for argon. 5. Beakers, Phillips, 125-mL, or Griffin, 50-mL, with watch glass c overs .** 6. Volum etric flasks , 10-, 25-,10 0-m L., and 1-L ** 7. Ass orted vo lum etric pipets as need ed.** 8. Hotplate, surface temperature 150 °C.
See SPECIAL PRECAUTIONS.
and rinse thoroughly in distilled water before use.
SPECIAL PRECAUTIONS: All perchloric acid digestion s are req uired to be done in a perchloric acid hood. When working with concentrated acids, wear protective clothing and gloves.
SAMPLING: 1. Calibrate each personal sampling pump with a representative sampler in line. 2. Sa m ple at an accurately known flow rate between 1 and 4 L/min for a total sample size of 200 to 2000 L (see Ta ble 1) for T W A m eas urem ents . Do not exceed a filter loading of ap prox imately 2 m g total dust.
SAMPLE PREPARATION: 3. Open the cassette filter holders and transfer the samples and blanks to clean beakers. 4. Add 5 mL ashing acid. Cover with a watchglass. Let stand 30 min at room tem perature. NOTE: Start a reagent blank at this step. 5. Heat on hotplate (120 °C) until ca. 0.5 mL remains. NOT E 1: Recovery of lead from som e pa int m atrices m ay require other d igestion tec hniques . See Method 7082 (Lead by Flame AA S) for an alterna tive hotplate digestion procedure or Method 7302 for a microwave digestion procedure. NOTE 2: Som e species of Al, Be, Co, Cr, Li, Mn, Mo, V, and Zr will not be completely solubilized by this procedure. Alternative solubilization techniques for most of these elements can be found elsewhe re [5-1 0]. For exa m ple, aq ua re gia m ay be n eed ed fo r Mn [6,12]. 6. Add 2 m L ashing acid and repeat step 5. Rep eat this step until the solution is clear. 7. Rem ove watchg lass and rinse into the beake r with distilled water. 8. Increase the tem perature to 150 °C and take the s am ple to near dryness (ca. 0.5 m L). 9. Dissolve the residue in 2 to 3 mL dilution acid. 10. Transfer the solutions quantitatively to 25-mL volumetric flasks. 11. Dilute to volume with dilution acid. NOTE: If more sensitivity is required, the final sample volume m ay be held to 10 mL.
NIOSH Manual of Analytical Methods (NMAM), Fourth Edition ​ELEM ENT S (ICP): ME TH OD 7300, Issue 3, dated 1 5 March 2003 - Page 3 of 8 CALIBRATION AND QUALITY CONTRO L: 12. Calibrate the spectrometer according to the manufacturers recomm endations. NOTE: Typically, an acid blank and 1.0 µg/m L m ultielem ent w ork ing sta nda rds are u sed . The following multielement combinations are chemically compatible in 4% HNO 3/1% HC lO 4: a. Al, As, Ba, Be, Ca, Cd, Co, Cr, Cu, Fe, La, In, Na b. Ag, K, Li, Mg, Mn, Ni, P, Pb, Se, Sr, Tl, V, Y, Zn, Sc c. Mo, Sb, Sn, Te, Ti, W , Zr d. Acid blank 13. Analyze a standard for every ten samples. 14. Check recoveries with at least two spiked blank filters per ten samples.
MEASUREMENT: 15. Set spec trome ter to conditions spe cified by manufac turer. 16. Analyze standards and samples. NOTE: If the values for the sam ples are a bove the rang e of th e standa rds, dilute the solutions w ith dilution acid, reanalyze and apply the appropriate dilution factor in the calculations.
CALCULATIONS: 17. Obta in the solution con cen trations for the sam ple, C s (µg/m L), an d the average m edia blank , C b (µg/m L), from the ins trum ent. 18. Using the solution volum es o f sam ple, V s (m L), an d m edia blank , V b (mL), calculate the concentration, C (m g/m 3), of each elem ent in the air volum e sam pled, V (L):
NOTE: µg/L / m g/m 3
EVALUATION OF METHOD: Issues 1 and 2 Method, 7300 was originally evaluated in 1981 [2,3]. The precision and recovery data were determined at 2.5 and 1000 µg of each element per sample on spiked filters. The m easurements used for the method evaluation in Issues 1 and 2 were determined with a Jarrell-Ash Model 1160 Inductively Coupled Plasma Spectrometer operated according to manufacturer's instructions. Issue 3 In this update of NIOSH Method 7300, the precision and recovery data were determined at approximately 3x and 10x the instrumental detection limits on comm ercially prepared spiked filters [12] using 25.0 mL as the final sample volume. Tables 3 and 4 list the precision and recovery data, instrumental detection limits, and analytical wavelengths for m ixed cellulos e es ter (M CE ) and polyvinyl chloride (P VC ) filters. PVC Filters which can be used for total dust measurem ents and then digested for m etals m eas urem ents were tested and found to give good results. The values in Tables 3 and 4 were determined with a Spectro Analytical Instruments Model End On Plasma (EOP)(axial) operated according to manufacturer’s instructions.
NIOSH Manual of Analytical Methods (NMAM), Fourth Edition ​ELEM ENT S (ICP): ME TH OD 7300, Issue 3, dated 1 5 March 2003 - Page 4 of 8 REFERENCES: [1] Millson M, Andrews R [2002]. Backup data report, Method 7300, unpublished report, NIOSH/DART. [2] Hull RD [1981]. Multielement Analysis of Industrial Hygiene Sam ples, NIO SH Internal Re port, presented at the American Industrial Hygiene Conference, Portland, Oregon. [3] NIOSH [1982]. NIO SH Ma nua l of Analytical Metho ds, 2nd e d., V. 7, P&CAM 351 (Elements by ICP), U.S. Department of Health and Human Services, Publ. (NIOSH) 82-100. [4] NIOSH [1994]. Elements by ICP: Method 7300, Issue 2. In: Eller PM , Cassinelli ME, eds., NIOSH Manual of Analytical M etho ds, 4 th ed. Cincinnati, OH: U.S. Department of Health and Human Services, Centers for Disease Control and Prevention, National Institute for Oc cupational Safety and Health, DHHS (NIOSH) Publication No. 94-113. [5] NIOSH [1994]. Lead by FAAS: Method 7082. In: Eller PM, Cassinelli ME, eds., NIOSH Manual of Analytical Me thod s, 4 th ed. Cincinnati, OH: U.S. Department of Health and H um an Services, C enters for Dise ase Control an d Prevention, N ation al Institute for Occupational Safety and Health, DHHS (NIOSH) Publication No. 94-113. [6] NIOS H [1977]. NIO SH M anual of Analytical Method s, 2nd ed., V. 2, S5 (Man ganes e), U.S. Department of Health, Education, and W elfare, Publ. (NIOSH) 77-157-B. [7] NIOSH [1994]. Tungsten, soluble/insoluble: Method 7074. In: Eller PM , Cassinelli ME, eds., NIOSH Manual of Analytical M etho ds, 4 th ed. Cincinnati, OH: U.S. Department of Health and Human Services, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, DHHS (NIOSH) Publication No. 94-113. [8] NIOSH [1979]. NIOSH Manual of Analytical Methods, 2nd ed., V. 5, P&CAM 173 (Metals by Ato m ic Absorption), U.S. Department of Health, Education, and Welfare, Publ. (NIOSH) 79-141. [9] NIO SH [1977]. NIO SH Ma nua l of Analytical Metho ds, 2nd e d., V. 3, S183 (T in), S185 (Zirconium ), and S376 (Molybdenum), U.S. Department of Health, Education, and W elfare, Publ. (NIOSH) 77-157-C. [10] ISO [2001]. W orkplace air - Determination of metals and metalloids in airborne particulate matter by inductively coupled plasma atomic emission spectrometry - Part 2: Sample preparation. International Orga nization for Standa rdization. ISO 152 02-2:2001(E ). [11] ASTM [1985]. 1985 Annual Book of A ST M Sta ndards, Vo l. 11.01; Standard Specification for Reagent W ater; ASTM , Philadelphia, PA, D11 93-77 (198 5). [12] Certification Inorganic Ventures for spikes.
METHOD REVISED BY: Mark Millson and Ronnee Andrews, NIOSH/DART. Method originally written by Mark Millson, NIOSH/DART, and R. DeLon Hull, Ph.D., NIOSH/DSHEF S, James B. Perkins, David L. W heeler, and Keith Nicholson, DataChem Labortories, Salt Lake City, UT.
NIOSH Manual of Analytical Methods (NMAM), Fourth Edition ​ELEM ENT S (ICP): ME TH OD 7300, Issue 3, dated 1 5 March 2003 - Page 5 of 8
TABLE 1. PROPERTIES AND SAMPLING VOLUM ES
Element (Sym bol)
Silver (Ag) Alu m inum (Al) Arsenic (As) Barium (Ba) Beryllium (Be) Calcium (Ca) Cadm ium (Cd) Cobalt (Co) Chrom ium (C r) Copper (Cu) Iron (Fe) Potassium (K) Lanthanum Lith ium (Li) Magnesium (Mg) Manganese (Mn) Molybdenum (Mo) Nick el (N i) Phosphorus (P) Lead (Pb) Antimony (Sb) Selenium (Se) Tin (Sn) Strontium (S r) Tellurium (Te) Titan ium (Ti) Thallium (Tl) Vanadium (V) Tun gsten (W ) Yttrium (Y) Zinc (Zn) Zirconium (Zr)
Properties Ato m ic W eight MP, °C 107.87 26.98 74.92 137.34 9.01 40.08 112.40 58.93 52.00 63.54 55.85 39.10 138.91 6.94 24.31 54.94 95.94 58.71 30.97 207.19 121.75 78.96 118.69 87.62 127.60 47.90 204.37 50.94 183.85 88.91 65.37 91.22
961 660 817 710 1278 842 321 1495 1890 1083 1535 63.65 920 179 651 1244 651 1453 44 328 630 .5 217 231 .9 769 450 1675 304 1890 3410 1495 419 1852
Air Volume, L @ OSHA PEL MIN MAX 250 5 5 50 1250 5 13 25 5 5 5 5 5 100 5 5 5 5 25 50 50 13 5 10 25 5 25 5 5 5 5 5
NIOSH Manual of Analytical Methods (NMAM), Fourth Edition
2000 100 2000 2000 2000 200 2000 2000 1000 1000 100 1000 1000 2000 67 200 67 1000 2000 2000 2000 2000 1000 1000 2000 100 2000 2000 1000 1000 200 200 ​ELEM ENT S (ICP): ME TH OD 7300, Issue 3, dated 1 5 March 2003 - Page 6 of 8 TABLE 2. EXPOSURE LIMITS, CAS #, RTECS Element (Symbol)
Exposure Limits, mg/m3 (Ca = carcinogen) OSHA NIOSH ACGIH
CAS #
RTECS
Silver (Ag)
7440-22-4
VW3500000
0.01 (dust, fume, metal)
0.01 (metal, soluble)
0.1 (metal) 0.01 (soluble)
Aluminum (Al)
7429-90-5
BD0330000
15 (total dust) 5 (respirable)
10 (total dust) 5 (respirable fume) 2 (salts, alkyls)
10 (dust) 5 (powders, fume) 2 (salts, alkyls)
Arsenic (As)
7440-38-2
CG0525000
varies
C 0.002, Ca
0.01, Ca
Barium (Ba)
7440-39-3
CQ8370000
0.5
0.5
0.5
Beryllium (Be)
7440-41-7
DS1750000
0.002, C 0.005
0.0005, Ca
0.002, Ca
Calcium (Ca)
7440-70-2
varies
varies
varies
Cadmium (Cd)
7440-43-9
EU9800000
0.005
lowest feasible, Ca
0.01 (total), Ca 0.002 (respir.), Ca
Cobalt (Co)
7440-48-4
GF8750000
0.1
0.05 (dust, fume)
0.02 (dust, fume)
Chromium (Cr)
7440-47-3
GB4200000
0.5
0.5
0.5
Copper (Cu)
7440-50-8
GL5325000
1 (dust, mists) 0.1 (fume)
1 (dust) 0.1 (fume)
1 (dust, mists) 0.2 (fume)
Iron (Fe)
7439-89-6
NO4565500
10 (dust, fume)
5 (dust, fume)
5 (fume)
Potassium (K)
7440-09-7
TS6460000
Lanthanum
7439-91-0
Lithium (Li)
7439-93-2
Magnesium (Mg)
7439-95-4
OM2100000
15 (dust) as oxide 5 (respirable)
10 (fume) as oxide
10 (fume) as oxide
Manganese (Mn)
7439-96-5
OO9275000
C5
1; STEL 3
5 (dust) 1; STEL 3 (fume)
Molybdenum (Mo)
7439-98-7
QA4680000
5 (soluble) 15 (total insoluble)
5 (soluble) 10 (insoluble)
5 (soluble) 10 (insoluble)
Nickel (Ni)
7440-02-0
QR5950000
1
0.015, Ca
0.1 (soluble) 1 (insoluble, metal)
Phosphorus (P)
7723-14-0
TH3500000
0.1
0.1
0.1
Lead (Pb)
7439-92-1
OF7525000
0.05
0.05
0.05
Antimony (Sb)
7440-36-0
CC4025000
0.5
0.5
0.5
Selenium (Se)
7782-49-2
VS7700000
0.2
0.2
0.2
Tin (Sn)
7440-31-5
XP7320000
2
2
2
Strontium (Sr)
7440-24-6
Tellurium (Te)
13494-80-9
WY2625000
0.1
0.1
0.1
Titanium (Ti)
7440-32-6
XR1700000
Thallium (Tl)
7440-28-0
XG3425000
0.1 (skin) (soluble)
0.1 (skin) (soluble)
0.1 (skin)
Vanadium (V)
7440-62-2
YW240000
C 0.05
Tungsten
7440-33-7
5
5 10 (STEL)
5 10 (STEL)
Yttrium (Y)
7440-65-5
ZG2980000
1
N/A
1
Zinc (Zn)
7440-66-6
ZG8600000
Zirconium (Zr)
7440-67-7
ZH7070000
5
5, STEL 10
5, STEL 10
NIOSH Manual of Analytical Methods (NMAM), Fourth Edition ​ELEM ENT S (ICP): ME TH OD 7300, Issue 3, dated 1 5 March 2003 - Page 7 of 8
TABLE 3.
Element (a) Ag Al As Ba Be Ca Cd Co Cr Cu Fe K La Li Mg Mn Mo Ni P Pb Sb Se Sn Sr Te Ti Tl V W Y Zn Zr (a) (b) (c)
M EASU REM ENT PRO CED UR ES AN D D ATA [1]. M ixed C ellulose Ester Filters (0.45 µm ) wavelength Est. LOD LOD Certified % R ecovery Percent nm µg/ ng/m L 3x LOD (c) RSD Filter (b) (N=25) 328 167 189 455 313 317 226 228 267 324 259 766 408 670 279 257 202 231 178 168 206 196 189 407 214 334 190 292 207 371 213 339
0.042 0.115 0.140 0.005 0.005 0.908 0.0075 0.012 0.020 0.068 0.095 1.73 0.048 0.010 0.098 0.005 0.020 0.020 0.092 0.062 0.192 0.135 0.040 0.005 0.078 0.050 0.092 0.028 0.075 0.012 0.310 0.022
1.7 4.6 5.6 0.2 0.2 36.3 0.3 0.5 0.8 2.7 3.8 69.3 1.9 0.4 3.9 0.2 0.8 0.8 3.7 2.5 7.7 5.4 1.6 0.2 3.1 2.0 3.7 1.1 3.0 0.5 12.4 0.9
0.77 1.54 3.08 0.31 0.31 15.4 0.31 0.31 0.31 1.54 1.54 23.0 0.77 0.31 1.54 0.31 0.31 0.31 1.54 1.54 3.08 2.3 0.77 0.31 1.54 0.77 1.54 0.77 1.54 0.31 4.60 0.31
102 .9 105 .4 94.9 101 .8 100 .0 98.7 99.8 100 .8 93.4 102 .8 103 .3 90.8 102 .8 110 .0 101 .1 101 .0 105 .3 109 .6 84.4 109 .4 90.2 87.6 90.2 101 .0 102 .0 98.4 100 .9 103 .2 72.2 100 .5 102 .2 88.0
2.64 11.5 2.28 1.72 1.44 6.65 1.99 1.97 16.3 1.47 5.46 1.51 2.23 1.91 8.35 1.77 2.47 3.54 6.19 2.41 11.4 11.6 18.0 1.55 2.67 2.04 2.48 1.92 10.1 1.80 1.87 19.4
Certified 10x LOD (b)
% Reco very (c)
Percent RSD (N=25)
3.21 6.40 12.9 1.29 1.29 64.0 1.29 1.29 1.29 6.40 6.40 96.4 3.21 1.29 6.40 1.29 1.29 1.29 6.40 6.40 12.9 9.64 3.21 1.29 6.40 3.21 6.40 3.21 6.40 1.29 19.3 1.29
98.3 101 .5 93.9 97.7 98.4 100 .2 97.5 98.4 101 .2 100 .6 98.0 97.6 100 .1 97.7 98.0 94.7 98.6 101 .2 82.5 101 .7 41.3 84.9 49 97.3 97.4 93.4 99.1 98.3 57.6 97.4 95.3 25
1.53 1.98 1.30 0.69 0.75 1.30 0.88 0.90 2.79 0.92 0.95 0.80 0.92 0.81 1.53 0.73 1.09 1.38 4.75 0.88 32.58 4.78 21.79 0.65 1.24 1.08 0.80 0.84 14.72 0.75 0.90 57.87
Bo ld values are qualitative only because of low rec overy. Values are certified by Inorganic Ventures INC. at 3x and 10x the approximate instrumental LOD Values reported were obtained with a Spectro Analytical Instruments EOP ICP; perform anc e m ay vary with instrument and should be independently verified.
NIOSH Manual of Analytical Methods (NMAM), Fourth Edition ​ELEM ENT S (ICP): ME TH OD 7300, Issue 3, dated 1 5 March 2003 - Page 8 of 8 TABLE 4. M EASU REM ENT PRO CED UR ES AN D D ATA [1]. Polyvinyl Chloride Filter (5.0 :m ) wav elength Est. LOD LOD Element nm
    g per
ng/m L (c) filter
(a) (b) (c)
Certified 3x LOD (b)
% Reco very (a)
Percent Certified 17 % Percent RSD 10x LOD Reco very RSD (N=25) (b) (a) (N=25)
Ag Al As Ba Be Ca Cd Co Cr Cu Fe K La Li Mg Mn Mo Ni P Pb Sb Se Sn Sr Te Ti Tl V W Y
328 167 189 455 313 317 226 228 267 324 259 766 408 670 279 257 202 231 178 168 206 196 189 407 214 334 190 292 207 371
0.042 0.115 0.140 0.005 0.005 0.908 0.0075 0.012 0.020 0.068 0.095 1.73 0.048 0.010 0.098 0.005 0.020 0.020 0.092 0.062 0.192 0.135 0.040 0.005 0.078 0.050 0.092 0.028 0.075 0.012
1.7 4.6 5.6 0.2 0.2 36.3 0.3 0.5 0.8 2.7 3.8 69.3 1.9 0.4 3.9 0.2 0.8 0.8 3.7 2.5 7.7 5.4 1.6 0.2 3.1 2.0 3.7 1.1 3.0 0.5
0.78 1.56 3.10 0.31 0.31 15.6 0.31 0.31 0.31 1.56 1.56 23.4 0.78 0.31 1.56 0.31 0.31 0.31 1.56 1.56 3.10 2.30 0.78 0.31 1.56 0.78 1.56 0.78 1.56 0.31
104 .2 77.4 100 .7 102 .4 106 .8 68.1 105 .2 109 .3 109 .4 104 .9 88.7 96.4 45.5 107 .7 54.8 101 .9 106 .6 111 .0 101 .9 109 .6 64.6 83.1 85.7 71.8 109 .6 101 .0 110 .3 108 .3 74.9 101 .5
8.20 115.24 5.13 3.89 3.53 12.66 5.57 4.67 5.31 5.18 46.82 4.70 4.19 4.80 20.59 4.18 5.82 5.89 17.82 6.12 22.54 26.23 27.29 4.09 7.49 9.46 4.04 3.94 15.79 3.63
3.18 6.40 12.70 1.270 1.270 64.00 1.27 1.27 1.27 6.40 6.40 95.00 3.18 1.27 6.40 1.27 1.27 1.27 6.40 6.40 12.70 9.50 3.18 1.27 6.40 3.18 6.40 3.18 6.40 1.27
81.8 92.9 96.9 99.8 102 .8 96.8 101 .9 102 .8 103 .4 101 .8 99.1 99.2 98.8 110 .4 64.5 99.3 98.1 103 .6 86.5 103 .2 38.1 76.0 52.0 81.2 97.3 92.4 101 .9 102 .5 44.7 101 .4
18.9 20.9 3.2 2.0 2.1 5.3 2.8 2.8 4.1 2.4 9.7 2.2 2.6 2.7 5.7 2.4 3.8 3.2 10.4 2.9 30.5 17.2 29.4 2.7 3.8 5.5 2.0 2.6 19.6 2.5
Zn Zr
213 339
0.310 0.022
12.4 0.9
4.70 0.31
91.0 70.7
68.69 54.20
19.1 1.27
101 .0 40.4
9.6 42.1
Values reported were obtained with a Spectro Analytical Instruments EOP ICP; perform anc e m ay vary with instrument and should be independently verified. Values are c ertified b y Inorganic Ven tures INC . at 3x and 10x the appro xim ate ins trum enta l LOD [12]. Bo ld values are qualitative only because of low recove ry. Other digestion techniques m ay be m ore appropriate for these elements and their compounds.
NIOSH Manual of Analytical Methods (NMAM), Fourth Edition