OREAS 186

Reference material OREAS 186 is one of a suite of thirteen nickel laterite CRMs (OREAS 182 to OREAS 195) prepared from transitional ore source materials. These were supplied by Anglo American Brazil Limitada from the Barro Alto Nickel Mine located in the state of Goiás and ~300 kms from the port of Santos, Brazil. It has been certified for Ni, Co, Al2O3, C, CaO, Cl, Cu, Cr2O3, Fe2O3, K2O, MgO, MnO, Na2O, P2O5, SiO2, S, SO3, TiO2 , Zn and LOI. Nineteen commercial analytical laboratories participated in the certification program with characterization of this suite of 20 analytes by the following methods:

  • Ni, Co, Al2O3, CaO, Cl, Cu, Cr2O3, Fe2O3, K2O, MgO, MnO, Na2O, P2O5, SiO2, SO3, TiO2 and Zn by lithium borate fusion with X-ray fluorescence (17 laboratories)
  • Ni, Co, Al2O3, CaO, Cu, Cr2O3, Fe2O3, K2O, MgO, MnO, Na2O, P2O5, SiO2, SO3, TiO2 and Zn by lithium borate or sodium peroxide fusion with ICP-OES (12 laboratories)
  • carbon and sulphur by infra-red combustion furnace (11 laboratories)
  • loss on ignition (LOI) at 1000°C (18 laboratories)
Analyte Certified Value 1SD 95% Confidence Limits Low 95% Confidence Limits High Method
Ni, Nickel (wt.%) 1.23 0.013 1.22 1.24 Borate Fusion XRF
Co, Cobalt (ppm) 692 17 681 702 Borate Fusion XRF
Fe2O3, Iron(III) oxide (wt.%) 32.04 0.182 31.85 32.23 Borate Fusion XRF
Al2O3, Aluminium(III) oxide (wt.%) 5.19 0.044 5.16 5.21 Borate Fusion XRF
CaO, Calcium oxide (wt.%) 0.562 0.007 0.558 0.566 Borate Fusion XRF
Cr2O3, Chromium(III) oxide (ppm) 14231 132 14148 14314 Borate Fusion XRF
MgO, Magnesium oxide (wt.%) 4.89 0.040 4.86 4.91 Borate Fusion XRF
MnO, Manganese oxide (wt.%) 0.522 0.005 0.518 0.526 Borate Fusion XRF
SiO2, Silicon dioxide (wt.%) 46.29 0.229 46.22 46.37 Borate Fusion XRF
TiO2, Titanium dioxide (wt.%) 0.069 0.004 0.067 0.072 Borate Fusion XRF
Zn, Zinc (ppm) 265 14 254 276 Borate Fusion XRF
Al2O3, Aluminium(III) oxide (wt.%) 5.11 0.115 5.03 5.19 Borate / Peroxide Fusion ICP
CaO, Calcium oxide (wt.%) 0.564 0.023 0.540 0.589 Borate / Peroxide Fusion ICP
Co, Cobalt (ppm) 680 28 663 697 Borate / Peroxide Fusion ICP
Cr2O3, Chromium(III) oxide (ppm) 14098 408 13875 14320 Borate / Peroxide Fusion ICP
Cu, Copper (ppm) 57 8 55 60 Borate / Peroxide Fusion ICP
Fe2O3, Iron(III) oxide (wt.%) 31.72 0.691 31.09 32.34 Borate / Peroxide Fusion ICP
MgO, Magnesium oxide (wt.%) 4.82 0.098 4.74 4.91 Borate / Peroxide Fusion ICP
MnO, Manganese oxide (wt.%) 0.519 0.014 0.509 0.529 Borate / Peroxide Fusion ICP
Ni, Nickel (wt.%) 1.22 0.021 1.20 1.24 Borate / Peroxide Fusion ICP
SiO2, Silicon dioxide (wt.%) 46.24 0.859 45.67 46.81 Borate / Peroxide Fusion ICP
TiO2, Titanium dioxide (wt.%) 0.070 0.001 0.069 0.071 Borate / Peroxide Fusion ICP
Zn, Zinc (ppm) 276 26 257 295 Borate / Peroxide Fusion ICP
LOI1000, Loss On Ignition @1000 °C (wt.%) 6.83 0.112 6.65 7.01 Thermogravimetry
C, Carbon (wt.%) 0.067 0.013 0.057 0.078 Infrared Combustion
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