OREAS 24e

Certified Reference Material OREAS 24e was prepared from olivine tholeiitic basalt from the Quaternary Newer Volcanics Province in Victoria, Australia. It is characterised by very low background gold of less than 2 parts per billion.

Fifteen commercial analytical laboratories participated in the program to characterise full ICP-OES and MS elemental suites by 4-acid digestion and Au by fire assay.

Analyte Certified Value 1SD Expanded Uncertainty Low Expanded Uncertainty High Method
Au, Gold (ppb) < 2.0 IND IND IND Pb Fire Assay
Ag, Silver (ppm) 0.024 0.004 0.016 0.033 4-Acid Digestion
Al, Aluminium (wt.%) 7.45 0.218 7.27 7.63 4-Acid Digestion
As, Arsenic (ppm) 0.54 0.07 0.42 0.66 4-Acid Digestion
Ba, Barium (ppm) 254 10 244 264 4-Acid Digestion
Be, Beryllium (ppm) 1.05 0.049 0.97 1.13 4-Acid Digestion
Ca, Calcium (wt.%) 5.83 0.168 5.67 6.00 4-Acid Digestion
Cd, Cadmium (ppm) 0.045 0.007 0.036 0.054 4-Acid Digestion
Ce, Cerium (ppm) 36.7 1.40 35.1 38.3 4-Acid Digestion
Co, Cobalt (ppm) 44.2 1.48 42.1 46.3 4-Acid Digestion
Cr, Chromium (ppm) 193 10 180 206 4-Acid Digestion
Cs, Caesium (ppm) 0.72 0.042 0.67 0.77 4-Acid Digestion
Cu, Copper (ppm) 45.0 2.04 42.9 47.1 4-Acid Digestion
Fe, Iron (wt.%) 7.63 0.188 7.44 7.82 4-Acid Digestion
Ga, Gallium (ppm) 19.7 0.76 18.8 20.6 4-Acid Digestion
Hf, Hafnium (ppm) 3.57 0.197 3.40 3.73 4-Acid Digestion
In, Indium (ppm) 0.062 0.005 0.053 0.072 4-Acid Digestion
K, Potassium (wt.%) 0.690 0.017 0.663 0.716 4-Acid Digestion
La, Lanthanum (ppm) 17.2 0.52 16.5 17.8 4-Acid Digestion
Li, Lithium (ppm) 7.57 0.434 7.18 7.95 4-Acid Digestion
Lu, Lutetium (ppm) 0.24 0.04 0.20 0.28 4-Acid Digestion
Mg, Magnesium (wt.%) 4.27 0.069 4.15 4.39 4-Acid Digestion
Mn, Manganese (wt.%) 0.105 0.004 0.101 0.109 4-Acid Digestion
Mo, Molybdenum (ppm) 1.59 0.114 1.48 1.69 4-Acid Digestion
Na, Sodium (wt.%) 2.30 0.069 2.22 2.39 4-Acid Digestion
Nb, Niobium (ppm) 21.4 0.85 20.4 22.3 4-Acid Digestion
Nd, Neodymium (ppm) 19.9 0.49 18.7 21.0 4-Acid Digestion
Ni, Nickel (ppm) 150 4 146 155 4-Acid Digestion
P, Phosphorus (wt.%) 0.148 0.004 0.144 0.152 4-Acid Digestion
Pb, Lead (ppm) 2.67 0.38 2.30 3.04 4-Acid Digestion
Pr, Praseodymium (ppm) 4.53 0.112 4.24 4.82 4-Acid Digestion
Rb, Rubidium (ppm) 20.5 0.82 19.7 21.4 4-Acid Digestion
Sb, Antimony (ppm) 0.059 0.009 0.047 0.071 4-Acid Digestion
Sc, Scandium (ppm) 20.2 0.85 19.2 21.1 4-Acid Digestion
Se, Selenium (ppm) 0.057 0.008 0.036 0.078 4-Acid Digestion
Sn, Tin (ppm) 1.45 0.093 1.33 1.56 4-Acid Digestion
Sr, Strontium (ppm) 413 17 398 428 4-Acid Digestion
Ta, Tantalum (ppm) 1.27 0.056 1.20 1.34 4-Acid Digestion
Tb, Terbium (ppm) 0.78 0.053 0.72 0.85 4-Acid Digestion
Te, Tellurium (ppm) < 0.005 IND IND IND 4-Acid Digestion
Th, Thorium (ppm) 2.71 0.134 2.56 2.86 4-Acid Digestion
Ti, Titanium (wt.%) 1.04 0.044 1.00 1.08 4-Acid Digestion
Tl, Thallium (ppm) 0.067 0.007 0.057 0.076 4-Acid Digestion
U, Uranium (ppm) 0.69 0.030 0.65 0.73 4-Acid Digestion
V, Vanadium (ppm) 155 4 150 160 4-Acid Digestion
W, Tungsten (ppm) 0.44 0.07 0.35 0.52 4-Acid Digestion
Y, Yttrium (ppm) 20.7 0.74 20.0 21.4 4-Acid Digestion
Yb, Ytterbium (ppm) 1.71 0.079 1.56 1.86 4-Acid Digestion
Zn, Zinc (ppm) 107 5 103 112 4-Acid Digestion
Zr, Zirconium (ppm) 141 7 135 147 4-Acid Digestion
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