| Description: 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)
Download Certificate OREAS25a Download DataPack OREAS25a | Analyte | Certified Value | 1SD | 95% CI Low | 95% CI High | Method |
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| 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 | 50.8 | 4-Acid Digestion | | Co, Cobalt (ppm) | 8.2 | 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 | | Cu, Copper (ppm) | 33.9 | 2.29 | 32.3 | 35.5 | 4-Acid Digestion | | Fe, Iron (wt.%) | 6.6 | 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 | 48.7 | 4-Acid Digestion | | P, Phosphorus (wt.%) | 0.048 | 0.002 | 0.046 | 0.05 | 4-Acid Digestion | | Pb, Lead (ppm) | 25.2 | 1.87 | 23.8 | 26.6 | 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 | 0.7 | 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 | 49.9 | 4-Acid Digestion | | Ta, Tantalum (ppm) | 1.6 | 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 | 0.03 | 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) | 2.1 | 0.201 | 1.89 | 2.3 | 4-Acid Digestion | | Y, Yttrium (ppm) | 12.3 | 2.1 | 10.5 | 14 | 4-Acid Digestion | | Zn, Zinc (ppm) | 44.4 | 2.6 | 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) | 0.3 | 0.025 | 0.28 | 0.33 | Aqua Regia Digestion | | Ca, Calcium (wt.%) | 0.15 | 0.014 | 0.138 | 0.162 | Aqua Regia Digestion | | Ce, Cerium (ppm) | 33.1 | 5.3 | 27.1 | 39 | 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 | 5.6 | 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 | 0.04 | 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 | 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) | 2.7 | 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) | 0.2 | 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 | 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) | 0.8 | 0.031 | 0.78 | 0.82 | Borate / Peroxide Fusion ICP | | Fe, Iron (wt.%) | 6.72 | 0.161 | 6.63 | 6.8 | 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 | 0.51 | Borate / Peroxide Fusion ICP | | La, Lanthanum (ppm) | 23.3 | 1.11 | 22.6 | 24 | 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 | 0.64 | 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 | 25.3 | 26.41 | Borate / Peroxide Fusion ICP | | Sm, Samarium (ppm) | 3.9 | 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 | Borate / Peroxide Fusion ICP | | Ti, Titanium (wt.%) | 1.14 | 0.033 | 1.12 | 1.16 | Borate / Peroxide Fusion ICP | | Tm, Thulium (ppm) | 0.43 | 0.03 | 0.42 | 0.45 | Borate / Peroxide Fusion ICP | | U, Uranium (ppm) | 3.51 | 0.119 | 3.43 | 3.6 | 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 | 1.5 | 24.2 | 26.1 | Borate / Peroxide Fusion ICP | | Yb, Ytterbium (ppm) | 2.89 | 0.17 | 2.8 | 2.97 | Borate / Peroxide Fusion ICP | | Zn, Zinc (ppm) | 46.8 | 5.8 | 44 | 49.6 | Borate / Peroxide Fusion ICP | | Zr, Zirconium (ppm) | 398 | 15 | 387 | 409 | Borate / Peroxide Fusion ICP | | 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 | | C, Carbon (wt.%) | 1.56 | 0.078 | 1.5 | 1.62 | Infrared Combustion | | S, Sulphur (wt.%) | 0.044 | 0.007 | 0.04 | 0.048 | Infrared Combustion | | Au, Gold (ppb) | 2 | IND | IND | IND | Pb Fire Assay | | LOI1000, Loss On Ignition @1000°C (wt.%) | 11.7 | 1.49 | 10.59 | 12.81 | Thermogravimetry |
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