OREAS 22j

OREAS 22j has been prepared from quartz sand to which 0.5% iron oxide (pigment) has been added to produce a pale grey pulp. This colouring gives the material an appearance of primary origin (i.e., non-oxide). It is characterised by extremely low background gold of less than 1 µg/kg (1 part per billion).

Nineteen 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) < 1.0 IND IND IND Pb Fire Assay
Al, Aluminium (wt.%) 0.073 0.008 0.066 0.081 4-Acid Digestion
Be, Beryllium (ppm) 0.069 0.009 0.050 0.087 4-Acid Digestion
Cd, Cadmium (ppm) < 0.020 IND IND IND 4-Acid Digestion
Ce, Cerium (ppm) 1.90 0.20 1.60 2.21 4-Acid Digestion
Co, Cobalt (ppm) 0.84 0.067 0.73 0.94 4-Acid Digestion
Cs, Caesium (ppm) 0.091 0.014 0.072 0.110 4-Acid Digestion
Cu, Copper (ppm) 8.52 0.543 7.89 9.14 4-Acid Digestion
Er, Erbium (ppm) 0.067 0.010 0.054 0.081 4-Acid Digestion
Fe, Iron (wt.%) 0.351 0.016 0.338 0.364 4-Acid Digestion
Ga, Gallium (ppm) 0.17 0.03 0.13 0.21 4-Acid Digestion
Gd, Gadolinium (ppm) 0.14 0.02 0.11 0.17 4-Acid Digestion
Hf, Hafnium (ppm) 0.19 0.02 0.16 0.23 4-Acid Digestion
In, Indium (ppm) < 0.005 IND IND IND 4-Acid Digestion
K, Potassium (wt.%) < 0.010 IND IND IND 4-Acid Digestion
La, Lanthanum (ppm) 0.89 0.10 0.74 1.03 4-Acid Digestion
Li, Lithium (ppm) 15.0 0.83 14.1 15.9 4-Acid Digestion
Mg, Magnesium (wt.%) 0.004 0.001 0.003 0.004 4-Acid Digestion
Mn, Manganese (wt.%) 0.012 0.000 0.012 0.013 4-Acid Digestion
Mo, Molybdenum (ppm) 0.57 0.08 0.49 0.66 4-Acid Digestion
Nb, Niobium (ppm) 0.41 0.04 0.36 0.46 4-Acid Digestion
Nd, Neodymium (ppm) 0.82 0.10 0.68 0.97 4-Acid Digestion
Ni, Nickel (ppm) 5.44 0.486 5.03 5.86 4-Acid Digestion
P, Phosphorus (wt.%) < 0.005 IND IND IND 4-Acid Digestion
Pr, Praseodymium (ppm) 0.23 0.019 0.18 0.27 4-Acid Digestion
Rb, Rubidium (ppm) 0.28 0.04 0.21 0.34 4-Acid Digestion
Re, Rhenium (ppm) < 0.002 IND IND IND 4-Acid Digestion
S, Sulphur (wt.%) < 0.010 IND IND IND 4-Acid Digestion
Sb, Antimony (ppm) 0.15 0.02 0.11 0.18 4-Acid Digestion
Sc, Scandium (ppm) 0.13 0.02 0.10 0.16 4-Acid Digestion
Se, Selenium (ppm) < 0.50 IND IND IND 4-Acid Digestion
Sm, Samarium (ppm) 0.15 0.02 0.12 0.18 4-Acid Digestion
Sn, Tin (ppm) 0.54 0.06 0.48 0.60 4-Acid Digestion
Sr, Strontium (ppm) 0.44 0.08 0.34 0.53 4-Acid Digestion
Tb, Terbium (ppm) 0.022 0.003 0.020 0.025 4-Acid Digestion
Te, Tellurium (ppm) < 0.050 IND IND IND 4-Acid Digestion
Th, Thorium (ppm) 0.65 0.053 0.57 0.74 4-Acid Digestion
Ti, Titanium (wt.%) 0.014 0.001 0.013 0.015 4-Acid Digestion
U, Uranium (ppm) 0.15 0.02 0.12 0.18 4-Acid Digestion
V, Vanadium (ppm) 1.98 0.108 1.85 2.12 4-Acid Digestion
W, Tungsten (ppm) 0.12 0.012 0.10 0.14 4-Acid Digestion
Y, Yttrium (ppm) 0.59 0.042 0.49 0.69 4-Acid Digestion
Yb, Ytterbium (ppm) 0.071 0.014 0.035 0.107 4-Acid Digestion
Zn, Zinc (ppm) 13.4 1.5 12.1 14.7 4-Acid Digestion
Zr, Zirconium (ppm) 5.90 0.471 5.01 6.78 4-Acid Digestion
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