OREAS 25a

Reference material OREAS 25a was sourced from an in situ layer of mature soil developed over early tertiary tholeiitic basalt in outer eastern Melbourne, Victoria, Australia. Ten commercial analytical laboratories participated in the program to characterise the elements reported in Tables 1 to 6 (please download certificate). The elements listed below are only a subset of the certified values. The following methods were employed:

  • Lithium borate fusion for full suite X-ray fluorescence (9 laboratories)
  • Sodium peroxide fusion or lithium borate fusion for full suite ICP-OES and ICP-MS (10 laboratories)
  • Four acid digestion for full suite ICP-OES and ICP-MS (9 laboratories)
  • Aqua regia digestion for full suite ICP-OES and ICP-MS (9 laboratories)
  • Fire assay with ICP-OES and ICP-MS for Au, Pd and Pt (9 laboratories)
  • Infra-red combustion furnace for C and S (9 laboratories)
  • Thermogravimetry for LOI (10 laboratories)
Analyte Certified Value 1SD 95% Confidence Low 95% Confidence High Method
Au, Gold (ppb) < 2 IND IND IND Pb Fire Assay
Cu, Copper (ppm) 33.9 2.29 32.3 35.5 4-Acid Digestion
Pb, Lead (ppm) 25.2 1.87 23.8 26.6 4-Acid Digestion
Al, Aluminium (wt.%) 8.87 0.425 8.42 9.32 4-Acid Digestion
Ba, Barium (ppm) 147 5 145 149 4-Acid Digestion
Be, Beryllium (ppm) 1.02 0.17 0.87 1.17 4-Acid Digestion
Bi, Bismuth (ppm) 0.35 0.034 0.33 0.37 4-Acid Digestion
Ca, Calcium (wt.%) 0.309 0.008 0.301 0.317 4-Acid Digestion
Ce, Cerium (ppm) 48.9 2.71 47.0 50.8 4-Acid Digestion
Co, Cobalt (ppm) 8.20 0.663 7.58 8.82 4-Acid Digestion
Cr, Chromium (ppm) 115 8 109 120 4-Acid Digestion
Cs, Caesium (ppm) 6.46 0.334 6.15 6.77 4-Acid Digestion
Fe, Iron (wt.%) 6.60 0.157 6.48 6.71 4-Acid Digestion
Ga, Gallium (ppm) 25.9 1.77 24.4 27.4 4-Acid Digestion
Hf, Hafnium (ppm) 4.53 0.53 4.03 5.04 4-Acid Digestion
K, Potassium (wt.%) 0.482 0.014 0.473 0.492 4-Acid Digestion
La, Lanthanum (ppm) 21.8 2.02 20.2 23.5 4-Acid Digestion
Li, Lithium (ppm) 36.7 1.34 35.8 37.7 4-Acid Digestion
Mg, Magnesium (wt.%) 0.327 0.017 0.316 0.339 4-Acid Digestion
Mn, Manganese (wt.%) 0.047 0.002 0.046 0.048 4-Acid Digestion
Mo, Molybdenum (ppm) 2.55 0.158 2.41 2.69 4-Acid Digestion
Na, Sodium (wt.%) 0.134 0.004 0.131 0.136 4-Acid Digestion
Nb, Niobium (ppm) 22.4 1.71 20.9 23.9 4-Acid Digestion
Ni, Nickel (ppm) 45.8 4.05 43.0 48.7 4-Acid Digestion
P, Phosphorus (wt.%) 0.048 0.002 0.046 0.050 4-Acid Digestion
Rb, Rubidium (ppm) 61 3.9 58 64 4-Acid Digestion
S, Sulphur (wt.%) 0.051 0.002 0.049 0.053 4-Acid Digestion
Sb, Antimony (ppm) 0.67 0.048 0.65 0.70 4-Acid Digestion
Sc, Scandium (ppm) 13.7 1.05 12.8 14.7 4-Acid Digestion
Sn, Tin (ppm) 4.06 0.196 3.94 4.19 4-Acid Digestion
Sr, Strontium (ppm) 48.5 1.99 47.0 49.9 4-Acid Digestion
Ta, Tantalum (ppm) 1.60 0.134 1.47 1.72 4-Acid Digestion
Th, Thorium (ppm) 15.8 0.97 15.1 16.5 4-Acid Digestion
Ti, Titanium (wt.%) 0.977 0.059 0.915 1.038 4-Acid Digestion
Tl, Thallium (ppm) 0.35 0.030 0.31 0.39 4-Acid Digestion
U, Uranium (ppm) 2.94 0.088 2.92 2.96 4-Acid Digestion
V, Vanadium (ppm) 157 8 150 165 4-Acid Digestion
W, Tungsten (ppm) 2.10 0.201 1.89 2.30 4-Acid Digestion
Y, Yttrium (ppm) 12.3 2.1 10.5 14.0 4-Acid Digestion
Zn, Zinc (ppm) 44.4 2.60 42.9 45.9 4-Acid Digestion
Al, Aluminium (wt.%) 5.85 0.784 5.16 6.54 Aqua Regia Digestion
Ba, Barium (ppm) 56 7 49 62 Aqua Regia Digestion
Bi, Bismuth (ppm) 0.30 0.025 0.28 0.33 Aqua Regia Digestion
Ca, Calcium (wt.%) 0.150 0.014 0.138 0.162 Aqua Regia Digestion
Ce, Cerium (ppm) 33.1 5.3 27.1 39.0 Aqua Regia Digestion
Co, Cobalt (ppm) 5.72 0.69 5.17 6.26 Aqua Regia Digestion
Cr, Chromium (ppm) 73 5.2 68 78 Aqua Regia Digestion
Cs, Caesium (ppm) 4.45 0.86 3.48 5.41 Aqua Regia Digestion
Cu, Copper (ppm) 24.9 2.8 22.6 27.2 Aqua Regia Digestion
Fe, Iron (wt.%) 5.99 0.459 5.60 6.38 Aqua Regia Digestion
Ga, Gallium (ppm) 20.6 2.6 18.5 22.7 Aqua Regia Digestion
K, Potassium (wt.%) 0.131 0.009 0.123 0.139 Aqua Regia Digestion
Mn, Manganese (wt.%) 0.042 0.003 0.040 0.045 Aqua Regia Digestion
Ni, Nickel (ppm) 26.9 3.4 23.8 29.9 Aqua Regia Digestion
P, Phosphorus (wt.%) 0.037 0.004 0.034 0.041 Aqua Regia Digestion
Pb, Lead (ppm) 21.0 2.01 19.5 22.6 Aqua Regia Digestion
Sc, Scandium (ppm) 8.64 0.799 7.97 9.32 Aqua Regia Digestion
Sn, Tin (ppm) 2.70 0.27 2.42 2.99 Aqua Regia Digestion
Sr, Strontium (ppm) 17.3 1.18 16.4 18.3 Aqua Regia Digestion
Th, Thorium (ppm) 10.7 0.97 9.8 11.6 Aqua Regia Digestion
Tl, Thallium (ppm) 0.20 0.02 0.17 0.23 Aqua Regia Digestion
U, Uranium (ppm) 1.49 0.18 1.29 1.69 Aqua Regia Digestion
V, Vanadium (ppm) 117 11 107 127 Aqua Regia Digestion
Y, Yttrium (ppm) 4.56 0.74 3.74 5.38 Aqua Regia Digestion
Zn, Zinc (ppm) 30.1 3.4 27.1 33.0 Aqua Regia Digestion
Al, Aluminium (wt.%) 9.25 0.131 9.19 9.31 Borate / Peroxide Fusion ICP
Ba, Barium (ppm) 151 8 146 157 Borate / Peroxide Fusion ICP
Ca, Calcium (wt.%) 0.302 0.024 0.286 0.318 Borate / Peroxide Fusion ICP
Ce, Cerium (ppm) 51 1.6 50 52 Borate / Peroxide Fusion ICP
Co, Cobalt (ppm) 8.05 0.529 7.62 8.48 Borate / Peroxide Fusion ICP
Cr, Chromium (ppm) 125 13 116 134 Borate / Peroxide Fusion ICP
Cs, Caesium (ppm) 6.36 0.368 6.09 6.62 Borate / Peroxide Fusion ICP
Dy, Dysprosium (ppm) 4.31 0.189 4.19 4.42 Borate / Peroxide Fusion ICP
Er, Erbium (ppm) 2.76 0.159 2.69 2.84 Borate / Peroxide Fusion ICP
Eu, Europium (ppm) 0.80 0.031 0.78 0.82 Borate / Peroxide Fusion ICP
Fe, Iron (wt.%) 6.72 0.161 6.63 6.80 Borate / Peroxide Fusion ICP
Ga, Gallium (ppm) 25.4 1.35 24.4 26.3 Borate / Peroxide Fusion ICP
Gd, Gadolinium (ppm) 3.79 0.222 3.64 3.94 Borate / Peroxide Fusion ICP
Hf, Hafnium (ppm) 11.1 0.62 10.7 11.5 Borate / Peroxide Fusion ICP
Ho, Holmium (ppm) 0.92 0.049 0.88 0.96 Borate / Peroxide Fusion ICP
K, Potassium (wt.%) 0.493 0.023 0.477 0.510 Borate / Peroxide Fusion ICP
La, Lanthanum (ppm) 23.3 1.11 22.6 24.0 Borate / Peroxide Fusion ICP
Lu, Lutetium (ppm) 0.45 0.038 0.42 0.48 Borate / Peroxide Fusion ICP
Mg, Magnesium (wt.%) 0.324 0.011 0.319 0.329 Borate / Peroxide Fusion ICP
Mn, Manganese (wt.%) 0.049 0.003 0.047 0.051 Borate / Peroxide Fusion ICP
Nb, Niobium (ppm) 26.5 1.18 25.6 27.3 Borate / Peroxide Fusion ICP
Nd, Neodymium (ppm) 20.0 0.64 19.6 20.4 Borate / Peroxide Fusion ICP
P, Phosphorus (wt.%) 0.049 0.006 0.043 0.055 Borate / Peroxide Fusion ICP
Pr, Praseodymium (ppm) 5.33 0.227 5.19 5.48 Borate / Peroxide Fusion ICP
Rb, Rubidium (ppm) 60 2.3 58 61 Borate / Peroxide Fusion ICP
Sc, Scandium (ppm) 13.5 0.57 12.8 14.2 Borate / Peroxide Fusion ICP
Si, Silicon (wt.%) 25.85 0.804 25.30 26.41 Borate / Peroxide Fusion ICP
Sm, Samarium (ppm) 3.90 0.229 3.77 4.02 Borate / Peroxide Fusion ICP
Sn, Tin (ppm) 4.83 0.92 4.18 5.48 Borate / Peroxide Fusion ICP
Sr, Strontium (ppm) 49.4 2.47 47.7 51.2 Borate / Peroxide Fusion ICP
Ta, Tantalum (ppm) 1.99 0.123 1.91 2.07 Borate / Peroxide Fusion ICP
Tb, Terbium (ppm) 0.66 0.051 0.63 0.68 Borate / Peroxide Fusion ICP
Th, Thorium (ppm) 16.4 0.81 15.9 17.0 Borate / Peroxide Fusion ICP
Ti, Titanium (wt.%) 1.14 0.033 1.12 1.16 Borate / Peroxide Fusion ICP
Tm, Thulium (ppm) 0.43 0.030 0.42 0.45 Borate / Peroxide Fusion ICP
U, Uranium (ppm) 3.51 0.119 3.43 3.60 Borate / Peroxide Fusion ICP
V, Vanadium (ppm) 164 9 157 170 Borate / Peroxide Fusion ICP
W, Tungsten (ppm) 2.89 0.284 2.73 3.05 Borate / Peroxide Fusion ICP
Y, Yttrium (ppm) 25.1 1.50 24.2 26.1 Borate / Peroxide Fusion ICP
Yb, Ytterbium (ppm) 2.89 0.170 2.80 2.97 Borate / Peroxide Fusion ICP
Zn, Zinc (ppm) 46.8 5.8 44.0 49.6 Borate / Peroxide Fusion ICP
Zr, Zirconium (ppm) 398 15 387 409 Borate / Peroxide Fusion ICP
C, Carbon (wt.%) 1.56 0.078 1.50 1.62 Infrared Combustion
S, Sulphur (wt.%) 0.044 0.007 0.040 0.048 Infrared Combustion
LOI1000, Loss on ignition @1000°C (wt.%) 11.70 1.490 10.59 12.81 Thermogravimetry
Al2O3, Aluminium(III) oxide (wt.%) 18.24 0.304 18.01 18.47 Borate Fusion XRF
CaO, Calcium oxide (wt.%) 0.438 0.007 0.433 0.442 Borate Fusion XRF
Fe2O3, Iron(III) oxide (wt.%) 9.77 0.144 9.66 9.88 Borate Fusion XRF
K2O, Potassium oxide (wt.%) 0.599 0.007 0.593 0.604 Borate Fusion XRF
MnO, Manganese oxide (wt.%) 0.063 0.004 0.061 0.065 Borate Fusion XRF
Na2O, Sodium oxide (wt.%) 0.191 0.008 0.185 0.196 Borate Fusion XRF
P2O5, Phosphorus(V) oxide (wt.%) 0.117 0.006 0.113 0.122 Borate Fusion XRF
SiO2, Silicon dioxide (wt.%) 56.66 0.844 55.99 57.32 Borate Fusion XRF
TiO2, Titanium dioxide (wt.%) 1.93 0.051 1.89 1.97 Borate Fusion XRF
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