OREAS 739

OREAS 739 is a smelter-grade alumina (SGA), certified reference material (CRM) prepared from three alumina products blended in equal proportions. The materials were sourced from Alcoa and Worsley Alumina in Western Australia, and Rio Tinto in Queensland (Australia). OREAS 739 was developed in collaboration with Alumina Quality Workshop Inc. and is typical of SGA produced in Australia and similar to globally produced SGA. Sixteen commercial analytical laboratories participated in the program to certify the following:

  • Al2O3, CaO, Cr2O3, Fe2O3, K2O, MgO, MnO, Na2O, P2O5, SiO2, SrO, TiO2, V2O5, and ZrO2 by lithium borate fusion with XRF;
  • BaO, BeO, Ga2O3, Sn, SrO, U, V2O5, W, ZnO and ZrO2 by borate fusion with ICP-OES/MS finish;
  • MOI (moisture) at 300°C and LOI (loss on ignition) at 1000°C on the ‘as received’ sample by TGA as per AS2879.1-2000.
Analyte Certified Value 1SD 95% Confidence Limits Low 95% Confidence Limits High Method
Al2O3, Aluminium(III) oxide (wt.%) 98.60 0.326 98.37 98.84 Borate Fusion XRF
CaO, Calcium oxide (wt.%) 0.031 0.003 0.029 0.033 Borate Fusion XRF
Cr2O3, Chromium(III) oxide (ppm) 2.58 1.51 1.32 3.84 Borate Fusion XRF
Fe2O3, Iron(III) oxide (wt.%) 0.009 0.001 0.008 0.010 Borate Fusion XRF
K2O, Potassium oxide (wt.%) < 0.010 IND IND IND Borate Fusion XRF
MgO, Magnesium oxide (wt.%) < 0.010 IND IND IND Borate Fusion XRF
MnO, Manganese oxide (ppm) 3.60 3.19 0.00 11.81 Borate Fusion XRF
Na2O, Sodium oxide (wt.%) 0.395 0.012 0.386 0.404 Borate Fusion XRF
P2O5, Phosphorus(V) oxide (wt.%) 0.001 0.000 0.001 0.001 Borate Fusion XRF
SiO2, Silicon dioxide (wt.%) 0.012 0.001 0.010 0.013 Borate Fusion XRF
SrO, Strontium oxide (ppm) < 100 IND IND IND Borate Fusion XRF
TiO2, Titanium dioxide (wt.%) 0.003 0.001 0.003 0.004 Borate Fusion XRF
V2O5, Vanadium(V) oxide (ppm) < 10.0 IND IND IND Borate Fusion XRF
ZrO2, Zirconium dioxide (ppm) < 100 IND IND IND Borate Fusion XRF
BaO, Barium oxide (ppm) < 1.00 IND IND IND Borate Fusion ICP
BeO, Beryllium oxide (ppm) 2.77 0.51 2.21 3.33 Borate Fusion ICP
Dy, Dysprosium (ppm) < 0.050 IND IND IND Borate Fusion ICP
Er, Erbium (ppm) < 0.030 IND IND IND Borate Fusion ICP
Eu, Europium (ppm) < 0.020 IND IND IND Borate Fusion ICP
Ga2O3, Gallium(III) oxide (ppm) 68 3.0 65 71 Borate Fusion ICP
Gd, Gadolinium (ppm) < 0.050 IND IND IND Borate Fusion ICP
Lu, Lutetium (ppm) < 0.010 IND IND IND Borate Fusion ICP
Nd, Neodymium (ppm) < 0.10 IND IND IND Borate Fusion ICP
Pr, Praseodymium (ppm) < 0.020 IND IND IND Borate Fusion ICP
Rb, Rubidium (ppm) < 0.20 IND IND IND Borate Fusion ICP
Sm, Samarium (ppm) < 0.050 IND IND IND Borate Fusion ICP
Sn, Tin (ppm) 1.03 0.35 0.79 1.27 Borate Fusion ICP
SrO, Strontium oxide (ppm) 3.85 0.70 3.04 4.65 Borate Fusion ICP
Ta, Tantalum (ppm) < 0.10 IND IND IND Borate Fusion ICP
Tb, Terbium (ppm) < 0.010 IND IND IND Borate Fusion ICP
Tm, Thulium (ppm) < 0.010 IND IND IND Borate Fusion ICP
U, Uranium (ppm) 0.30 0.05 0.27 0.34 Borate Fusion ICP
V2O5, Vanadium(V) oxide (ppm) 12.8 3.9 9.7 15.8 Borate Fusion ICP
W, Tungsten (ppm) 0.84 0.30 0.57 1.10 Borate Fusion ICP
Y, Yttrium (ppm) < 0.10 IND IND IND Borate Fusion ICP
Yb, Ytterbium (ppm) < 0.030 IND IND IND Borate Fusion ICP
ZnO, Zinc oxide (ppm) 69 4.8 55 82 Borate Fusion ICP
ZrO2, Zirconium dioxide (ppm) 1.82 0.81 0.92 2.73 Borate Fusion ICP
LOI300-1000, Loss On Ignition 300°C to 1000 °C (wt.%) 1.03 0.056 0.99 1.07 Thermogravimetry
MOI300, Moisture @300°C (wt.%) 4.65 1.11 3.66 5.63 Thermogravimetry
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