OREAS 703

OREAS 703 was prepared from a blend of granodiorite, limestone, multiple mineral concentrates (Mo, W, and Bi), and high-grade fluorite ore. The tungsten- and bismuth-bearing concentrates were sourced from the Nui Phao polymetallic deposit in northern Vietnam, which is characterised by skarn-hosted mineralisation containing scheelite and bismuth sulphide minerals. The resulting CRM is chemically representative of a polymetallic silicate–carbonate system.

Twenty-five commercial analytical laboratories participated in the program to certify the elements reported below using the following methods:

  • Major elements by borate fusion with XRF finish
  • LOI at 1000 °C using a muffle furnace or thermogravimetric analyser (TGA)
  • Fluorine by ion selective electrode
  • Total S by infrared combustion furnace/CS analyser
  • Full ICP-OES and MS elemental suites by peroxide fusion
  • Full ICP-OES and ICP-MS elemental suites by 4-acid (HNO3-HF-HClO4-HCl) digestion

Homogeneity was evaluated using 12 subsamples analysed by oxidising fusion with X-ray fluorescence finish. ANOVA was applied to duplicates from six test units to compare within- and between-unit variances, providing a statistical measure of batch homogeneity.

Analyte Certified Value 1SD Expanded Uncertainty Low Expanded Uncertainty High Method
WO3, Tungsten trioxide (wt.%) 0.634 0.056 0.602 0.666 Borate / Peroxide Fusion ICP
Bi, Bismuth (ppm) 541 33 515 568 Borate / Peroxide Fusion ICP
Mo, Molybdenum (ppm) 1026 73 980 1072 Borate / Peroxide Fusion ICP
F, Fluorine (wt.%) 0.621 0.103 0.556 0.686 Ion Selective Electrode
WO3, Tungsten trioxide (wt.%) 0.625 0.012 0.614 0.637 Borate Fusion XRF
Al2O3, Aluminium(III) oxide (wt.%) 10.36 0.132 10.25 10.47 Borate Fusion XRF
As, Arsenic (ppm) < 100 IND IND IND Borate Fusion XRF
BaO, Barium oxide (ppm) 788 80 691 884 Borate Fusion XRF
Bi, Bismuth (ppm) 570 75 513 628 Borate Fusion XRF
CaO, Calcium oxide (wt.%) 19.21 0.209 19.06 19.37 Borate Fusion XRF
Co, Cobalt (ppm) < 100 IND IND IND Borate Fusion XRF
Cr2O3, Chromium(III) oxide (ppm) < 150 IND IND IND Borate Fusion XRF
Cu, Copper (ppm) 715 35 684 747 Borate Fusion XRF
Fe2O3, Iron(III) oxide (wt.%) 4.27 0.081 4.21 4.33 Borate Fusion XRF
HfO2, Hafnium dioxide (ppm) < 100 IND IND IND Borate Fusion XRF
K2O, Potassium oxide (wt.%) 2.46 0.049 2.42 2.49 Borate Fusion XRF
MgO, Magnesium oxide (wt.%) 1.05 0.030 1.03 1.07 Borate Fusion XRF
MnO, Manganese oxide (wt.%) 0.050 0.005 0.046 0.054 Borate Fusion XRF
Mo, Molybdenum (ppm) 1083 70 1004 1163 Borate Fusion XRF
Na2O, Sodium oxide (wt.%) 1.90 0.105 1.83 1.97 Borate Fusion XRF
Ni, Nickel (ppm) < 50 IND IND IND Borate Fusion XRF
P2O5, Phosphorus(V) oxide (wt.%) 0.139 0.003 0.136 0.142 Borate Fusion XRF
Pb, Lead (ppm) < 50 IND IND IND Borate Fusion XRF
SiO2, Silicon dioxide (wt.%) 44.86 0.403 44.42 45.30 Borate Fusion XRF
SO3, Sulphur trioxide (wt.%) 1.63 0.062 1.57 1.69 Borate Fusion XRF
Sr, Strontium (ppm) 184 40 135 233 Borate Fusion XRF
TiO2, Titanium dioxide (wt.%) 0.416 0.018 0.402 0.430 Borate Fusion XRF
Zn, Zinc (ppm) 71 18 51 91 Borate Fusion XRF
LOI1000, Loss on ignition @1000 °C (wt.%) 12.75 0.245 12.56 12.94 Thermogravimetry
S, Sulphur (wt.%) 0.654 0.025 0.636 0.672 Infrared Combustion
Al2O3, Aluminium(III) oxide (wt.%) 10.35 0.228 10.11 10.59 Borate / Peroxide Fusion ICP
Ba, Barium (ppm) 708 18 685 731 Borate / Peroxide Fusion ICP
Be, Beryllium (ppm) 10.3 1.2 9.3 11.3 Borate / Peroxide Fusion ICP
CaO, Calcium oxide (wt.%) 19.17 0.667 18.65 19.68 Borate / Peroxide Fusion ICP
Cd, Cadmium (ppm) < 10.0 IND IND IND Borate / Peroxide Fusion ICP
Ce, Cerium (ppm) 66 2.9 63 69 Borate / Peroxide Fusion ICP
Co, Cobalt (ppm) 8.23 0.92 7.27 9.19 Borate / Peroxide Fusion ICP
Cr, Chromium (ppm) 33.0 2.97 29.4 36.6 Borate / Peroxide Fusion ICP
Cs, Caesium (ppm) 10.1 0.63 9.6 10.7 Borate / Peroxide Fusion ICP
Cu, Copper (ppm) 727 46 686 767 Borate / Peroxide Fusion ICP
Dy, Dysprosium (ppm) 5.44 0.296 5.07 5.81 Borate / Peroxide Fusion ICP
Er, Erbium (ppm) 2.73 0.148 2.52 2.93 Borate / Peroxide Fusion ICP
Eu, Europium (ppm) 1.15 0.072 1.06 1.25 Borate / Peroxide Fusion ICP
Fe2O3, Iron(III) oxide (wt.%) 4.33 0.107 4.21 4.44 Borate / Peroxide Fusion ICP
Ga, Gallium (ppm) 16.1 0.50 15.5 16.7 Borate / Peroxide Fusion ICP
Gd, Gadolinium (ppm) 6.04 0.411 5.63 6.44 Borate / Peroxide Fusion ICP
Hf, Hafnium (ppm) 4.86 0.65 4.29 5.43 Borate / Peroxide Fusion ICP
Ho, Holmium (ppm) 1.00 0.060 0.92 1.08 Borate / Peroxide Fusion ICP
K2O, Potassium oxide (wt.%) 2.47 0.083 2.38 2.56 Borate / Peroxide Fusion ICP
La, Lanthanum (ppm) 33.5 1.37 32.0 35.1 Borate / Peroxide Fusion ICP
Li, Lithium (ppm) 42.2 3.11 38.7 45.6 Borate / Peroxide Fusion ICP
Lu, Lutetium (ppm) 0.35 0.031 0.31 0.38 Borate / Peroxide Fusion ICP
MgO, Magnesium oxide (wt.%) 1.04 0.039 1.01 1.07 Borate / Peroxide Fusion ICP
MnO, Manganese oxide (wt.%) 0.049 0.002 0.048 0.050 Borate / Peroxide Fusion ICP
Na2O, Sodium oxide (wt.%) 1.91 0.043 1.83 1.98 Borate / Peroxide Fusion ICP
Nb, Niobium (ppm) 9.63 0.459 9.05 10.21 Borate / Peroxide Fusion ICP
Nd, Neodymium (ppm) 29.9 1.74 27.9 31.9 Borate / Peroxide Fusion ICP
P2O5, Phosphorus(V) oxide (wt.%) 0.141 0.006 0.132 0.150 Borate / Peroxide Fusion ICP
Pb, Lead (ppm) 18.0 2.6 15.5 20.5 Borate / Peroxide Fusion ICP
Pr, Praseodymium (ppm) 7.87 0.399 7.41 8.34 Borate / Peroxide Fusion ICP
Rb, Rubidium (ppm) 135 6 130 139 Borate / Peroxide Fusion ICP
S, Sulphur (wt.%) 0.650 0.049 0.608 0.692 Borate / Peroxide Fusion ICP
Sc, Scandium (ppm) 6.47 0.564 5.49 7.45 Borate / Peroxide Fusion ICP
SiO2, Silicon dioxide (wt.%) 45.43 1.039 44.24 46.63 Borate / Peroxide Fusion ICP
Sm, Samarium (ppm) 6.40 0.385 5.97 6.83 Borate / Peroxide Fusion ICP
Sn, Tin (ppm) 5.98 0.503 5.24 6.73 Borate / Peroxide Fusion ICP
Sr, Strontium (ppm) 184 8 178 191 Borate / Peroxide Fusion ICP
Ta, Tantalum (ppm) 0.87 0.09 0.76 0.99 Borate / Peroxide Fusion ICP
Tb, Terbium (ppm) 0.93 0.048 0.87 1.00 Borate / Peroxide Fusion ICP
Th, Thorium (ppm) 10.7 0.52 10.0 11.4 Borate / Peroxide Fusion ICP
Ti, Titanium (wt.%) 0.252 0.011 0.244 0.259 Borate / Peroxide Fusion ICP
Tl, Thallium (ppm) 0.77 0.11 0.62 0.93 Borate / Peroxide Fusion ICP
Tm, Thulium (ppm) 0.37 0.028 0.34 0.40 Borate / Peroxide Fusion ICP
U, Uranium (ppm) 5.93 0.276 5.40 6.46 Borate / Peroxide Fusion ICP
V, Vanadium (ppm) 44.4 3.32 42.1 46.7 Borate / Peroxide Fusion ICP
Y, Yttrium (ppm) 26.5 2.03 24.8 28.1 Borate / Peroxide Fusion ICP
Yb, Ytterbium (ppm) 2.40 0.153 2.16 2.64 Borate / Peroxide Fusion ICP
Zn, Zinc (ppm) 69 8 60 79 Borate / Peroxide Fusion ICP
Zr, Zirconium (ppm) 186 11 172 199 Borate / Peroxide Fusion ICP
Ag, Silver (ppm) 0.292 0.027 0.261 0.322 4-Acid Digestion
Al, Aluminium (wt.%) 5.46 0.128 5.26 5.66 4-Acid Digestion
As, Arsenic (ppm) 3.48 0.38 2.80 4.15 4-Acid Digestion
Ba, Barium (ppm) 709 16 687 732 4-Acid Digestion
Be, Beryllium (ppm) 9.58 0.630 9.09 10.07 4-Acid Digestion
Bi, Bismuth (ppm) 553 32 529 576 4-Acid Digestion
Ca, Calcium (wt.%) 13.35 0.503 12.90 13.81 4-Acid Digestion
Ce, Cerium (ppm) 70 4.1 65 74 4-Acid Digestion
Co, Cobalt (ppm) 7.91 0.530 7.41 8.41 4-Acid Digestion
Cr, Chromium (ppm) 24.7 2.6 21.9 27.5 4-Acid Digestion
Cs, Caesium (ppm) 10.6 0.50 9.9 11.2 4-Acid Digestion
Cu, Copper (ppm) 719 28 694 745 4-Acid Digestion
Dy, Dysprosium (ppm) 4.02 0.180 3.67 4.37 4-Acid Digestion
Er, Erbium (ppm) 1.69 0.064 1.55 1.83 4-Acid Digestion
Eu, Europium (ppm) 1.18 0.065 1.07 1.30 4-Acid Digestion
Fe, Iron (wt.%) 3.00 0.100 2.90 3.11 4-Acid Digestion
Ga, Gallium (ppm) 15.7 0.67 14.9 16.5 4-Acid Digestion
Gd, Gadolinium (ppm) 5.64 0.56 4.98 6.31 4-Acid Digestion
Hf, Hafnium (ppm) 1.31 0.119 1.17 1.45 4-Acid Digestion
Ho, Holmium (ppm) 0.67 0.051 0.60 0.75 4-Acid Digestion
In, Indium (ppm) 0.16 0.010 0.15 0.17 4-Acid Digestion
K, Potassium (wt.%) 2.05 0.060 1.99 2.12 4-Acid Digestion
La, Lanthanum (ppm) 34.2 2.49 32.3 36.2 4-Acid Digestion
Li, Lithium (ppm) 40.6 1.33 39.1 42.1 4-Acid Digestion
Lu, Lutetium (ppm) 0.18 0.013 0.16 0.20 4-Acid Digestion
Mg, Magnesium (wt.%) 0.606 0.024 0.587 0.625 4-Acid Digestion
Mn, Manganese (wt.%) 0.036 0.001 0.035 0.037 4-Acid Digestion
Mo, Molybdenum (ppm) 1020 45 986 1054 4-Acid Digestion
Na, Sodium (wt.%) 1.41 0.032 1.35 1.46 4-Acid Digestion
Nb, Niobium (ppm) 9.16 0.576 8.47 9.85 4-Acid Digestion
Nd, Neodymium (ppm) 29.9 2.52 26.9 32.8 4-Acid Digestion
Ni, Nickel (ppm) 11.8 0.81 10.8 12.9 4-Acid Digestion
P, Phosphorus (wt.%) 0.061 0.002 0.058 0.063 4-Acid Digestion
Pb, Lead (ppm) 18.5 1.67 17.2 19.8 4-Acid Digestion
Pr, Praseodymium (ppm) 8.16 0.373 7.58 8.74 4-Acid Digestion
Rb, Rubidium (ppm) 139 7 132 146 4-Acid Digestion
Re, Rhenium (ppm) 0.064 0.015 0.049 0.080 4-Acid Digestion
S, Sulphur (wt.%) 0.662 0.028 0.637 0.687 4-Acid Digestion
Sb, Antimony (ppm) 0.53 0.048 0.45 0.61 4-Acid Digestion
Sc, Scandium (ppm) 6.02 0.375 5.68 6.35 4-Acid Digestion
Sm, Samarium (ppm) 6.15 0.80 5.29 7.01 4-Acid Digestion
Sn, Tin (ppm) 5.58 0.165 5.32 5.84 4-Acid Digestion
Sr, Strontium (ppm) 186 6 179 193 4-Acid Digestion
Ta, Tantalum (ppm) 0.65 0.17 0.47 0.83 4-Acid Digestion
Tb, Terbium (ppm) 0.81 0.051 0.73 0.88 4-Acid Digestion
Te, Tellurium (ppm) 2.14 0.25 1.88 2.40 4-Acid Digestion
Th, Thorium (ppm) 10.9 0.73 10.1 11.7 4-Acid Digestion
Ti, Titanium (wt.%) 0.245 0.006 0.236 0.254 4-Acid Digestion
Tl, Thallium (ppm) 0.80 0.038 0.76 0.84 4-Acid Digestion
Tm, Thulium (ppm) 0.22 0.013 0.19 0.24 4-Acid Digestion
U, Uranium (ppm) 5.73 0.359 5.17 6.29 4-Acid Digestion
V, Vanadium (ppm) 40.9 1.77 38.9 42.9 4-Acid Digestion
W, Tungsten (wt.%) 0.459 0.050 0.423 0.494 4-Acid Digestion
Y, Yttrium (ppm) 16.5 1.31 15.6 17.3 4-Acid Digestion
Yb, Ytterbium (ppm) 1.36 0.079 1.26 1.47 4-Acid Digestion
Zn, Zinc (ppm) 68 2.0 65 71 4-Acid Digestion
Zr, Zirconium (ppm) 41.8 4.8 38.0 45.6 4-Acid Digestion
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