OREAS 992b

OREAS 992b is a copper sulphide certified reference material (CRM) prepared from a nickel matte by-product during the refining process at a nickel refinery. Fifteen ‘umpire’ laboratories undertook copper, gold, silver and moisture analysis on the sample as received but results are corrected to dry basis. The term ‘umpire’ here refers to the routine analysis by these laboratories using classical methodologies for precious and base metals. Fifteen geoanalytical laboratories also participated in the analytical program to undertake the following:

  • Full elemental suites by peroxide fusion with ICP-OES and MS finish;
  • Full elemental suites by 4-acid digestion with ICP-OES and MS finish;
  • Total S by IR combustion furnace;
  • Gold by instrumental neutron activation analysis (INAA) to confirm homogeneity (undertaken by ANSTO, Lucas Heights).
Analyte Certified Value 1SD 95% Confidence Low 95% Confidence High Method
Cu, Copper (wt.%) 45.98 0.227 45.81 46.15 Classical Wet Chemistry
Ag, Silver (ppm) 344 7 338 350 Pb Fire Assay (Grav)
Au, Gold (ppm) 15.00 0.851 14.55 15.44 Pb Fire Assay (Grav)
Pd, Palladium (ppm) 127.9 3.0 125.7 130.0 Pb Fire Assay
Pt, Platinum (ppm) 21.90 0.695 21.36 22.44 Pb Fire Assay
Al, Aluminium (wt.%) 0.047 0.007 0.041 0.052 Peroxide Fusion ICP
As, Arsenic (ppm) 594 38 571 617 Peroxide Fusion ICP
Ba, Barium (ppm) 584 40 540 629 Peroxide Fusion ICP
Be, Beryllium (ppm) < 1.00 IND IND IND Peroxide Fusion ICP
Bi, Bismuth (ppm) 3.89 0.233 3.68 4.10 Peroxide Fusion ICP
Ca, Calcium (wt.%) < 0.050 IND IND IND Peroxide Fusion ICP
Cd, Cadmium (ppm) 26.8 2.17 24.8 28.8 Peroxide Fusion ICP
Co, Cobalt (ppm) 750 31 732 768 Peroxide Fusion ICP
Cr, Chromium (ppm) < 100 IND IND IND Peroxide Fusion ICP
Cu, Copper (wt.%) 44.52 1.603 43.06 45.99 Peroxide Fusion ICP
Dy, Dysprosium (ppm) < 0.50 IND IND IND Peroxide Fusion ICP
Er, Erbium (ppm) < 0.10 IND IND IND Peroxide Fusion ICP
Eu, Europium (ppm) < 0.10 IND IND IND Peroxide Fusion ICP
Fe, Iron (wt.%) 1.07 0.037 1.05 1.09 Peroxide Fusion ICP
Ga, Gallium (ppm) < 1.00 IND IND IND Peroxide Fusion ICP
In, Indium (ppm) 0.38 0.06 0.35 0.42 Peroxide Fusion ICP
K, Potassium (wt.%) < 0.100 IND IND IND Peroxide Fusion ICP
Mg, Magnesium (wt.%) 0.013 0.004 0.011 0.015 Peroxide Fusion ICP
Mn, Manganese (wt.%) 0.013 0.002 0.012 0.013 Peroxide Fusion ICP
Mo, Molybdenum (ppm) 9.22 1.02 8.38 10.06 Peroxide Fusion ICP
Ni, Nickel (wt.%) 1.48 0.028 1.46 1.49 Peroxide Fusion ICP
P, Phosphorus (wt.%) < 0.010 IND IND IND Peroxide Fusion ICP
Pb, Lead (wt.%) 0.379 0.015 0.371 0.388 Peroxide Fusion ICP
Pr, Praseodymium (ppm) < 0.50 IND IND IND Peroxide Fusion ICP
Rb, Rubidium (ppm) 1.97 0.54 1.35 2.60 Peroxide Fusion ICP
Re, Rhenium (ppm) < 0.10 IND IND IND Peroxide Fusion ICP
S, Sulphur (wt.%) 38.33 1.015 37.62 39.04 Peroxide Fusion ICP
Sb, Antimony (ppm) 841 78 755 927 Peroxide Fusion ICP
Se, Selenium (ppm) 74 6.4 68 80 Peroxide Fusion ICP
Si, Silicon (wt.%) 0.220 0.028 0.198 0.242 Peroxide Fusion ICP
Te, Tellurium (ppm) 1.90 0.62 1.38 2.42 Peroxide Fusion ICP
Th, Thorium (ppm) < 0.50 IND IND IND Peroxide Fusion ICP
Ti, Titanium (wt.%) < 0.010 IND IND IND Peroxide Fusion ICP
Tl, Thallium (ppm) 0.58 0.07 0.54 0.63 Peroxide Fusion ICP
Y, Yttrium (ppm) < 0.50 IND IND IND Peroxide Fusion ICP
Zn, Zinc (wt.%) 0.861 0.034 0.841 0.881 Peroxide Fusion ICP
Ag, Silver (ppm) 340 13 330 351 4-Acid Digestion
Al, Aluminium (wt.%) 0.040 0.003 0.039 0.042 4-Acid Digestion
As, Arsenic (ppm) 582 36 560 604 4-Acid Digestion
Be, Beryllium (ppm) < 0.050 IND IND IND 4-Acid Digestion
Bi, Bismuth (ppm) 3.75 0.159 3.67 3.83 4-Acid Digestion
Ca, Calcium (wt.%) 0.017 0.004 0.015 0.019 4-Acid Digestion
Cd, Cadmium (ppm) 25.5 1.80 24.5 26.5 4-Acid Digestion
Ce, Cerium (ppm) 0.65 0.15 0.53 0.76 4-Acid Digestion
Co, Cobalt (ppm) 749 21 735 763 4-Acid Digestion
Cs, Caesium (ppm) 0.082 0.016 0.064 0.101 4-Acid Digestion
Cu, Copper (wt.%) 44.73 1.393 43.46 46.00 4-Acid Digestion
Er, Erbium (ppm) < 0.10 IND IND IND 4-Acid Digestion
Eu, Europium (ppm) < 0.10 IND IND IND 4-Acid Digestion
Fe, Iron (wt.%) 1.05 0.054 1.02 1.08 4-Acid Digestion
Ga, Gallium (ppm) 0.26 0.04 0.22 0.29 4-Acid Digestion
Gd, Gadolinium (ppm) < 0.10 IND IND IND 4-Acid Digestion
Hf, Hafnium (ppm) < 0.10 IND IND IND 4-Acid Digestion
In, Indium (ppm) 0.36 0.033 0.34 0.37 4-Acid Digestion
K, Potassium (wt.%) 0.020 0.004 0.017 0.022 4-Acid Digestion
Mg, Magnesium (wt.%) 0.010 0.001 0.010 0.010 4-Acid Digestion
Mn, Manganese (wt.%) 0.012 0.001 0.012 0.013 4-Acid Digestion
Mo, Molybdenum (ppm) 7.29 0.78 6.69 7.89 4-Acid Digestion
Na, Sodium (wt.%) 0.010 0.001 0.009 0.011 4-Acid Digestion
Nb, Niobium (ppm) 0.093 0.010 0.080 0.105 4-Acid Digestion
Nd, Neodymium (ppm) 0.29 0.021 0.28 0.31 4-Acid Digestion
Ni, Nickel (wt.%) 1.48 0.021 1.47 1.50 4-Acid Digestion
Pb, Lead (wt.%) 0.374 0.010 0.368 0.380 4-Acid Digestion
Pr, Praseodymium (ppm) < 0.10 IND IND IND 4-Acid Digestion
Rb, Rubidium (ppm) 0.97 0.12 0.90 1.05 4-Acid Digestion
Re, Rhenium (ppm) < 0.050 IND IND IND 4-Acid Digestion
Sb, Antimony (ppm) 818 35 793 843 4-Acid Digestion
Sc, Scandium (ppm) < 1.00 IND IND IND 4-Acid Digestion
Se, Selenium (ppm) 71 9 65 76 4-Acid Digestion
Sn, Tin (ppm) 0.48 0.06 0.44 0.52 4-Acid Digestion
Sr, Strontium (ppm) 4.96 0.87 4.15 5.76 4-Acid Digestion
Tb, Terbium (ppm) < 0.050 IND IND IND 4-Acid Digestion
Te, Tellurium (ppm) 1.63 0.130 1.57 1.69 4-Acid Digestion
Ti, Titanium (wt.%) 0.003 0.000 0.002 0.003 4-Acid Digestion
Tl, Thallium (ppm) 0.60 0.032 0.58 0.62 4-Acid Digestion
Tm, Thulium (ppm) < 0.10 IND IND IND 4-Acid Digestion
U, Uranium (ppm) 0.26 0.05 0.23 0.28 4-Acid Digestion
V, Vanadium (ppm) < 1.00 IND IND IND 4-Acid Digestion
W, Tungsten (ppm) 1.12 0.23 0.92 1.33 4-Acid Digestion
Y, Yttrium (ppm) 0.26 0.05 0.24 0.29 4-Acid Digestion
Yb, Ytterbium (ppm) < 0.10 IND IND IND 4-Acid Digestion
Zn, Zinc (wt.%) 0.862 0.036 0.842 0.882 4-Acid Digestion
Zr, Zirconium (ppm) 1.33 0.087 1.28 1.38 4-Acid Digestion
S, Sulphur (wt.%) 37.79 0.701 37.37 38.21 Infrared Combustion
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