OREAS 187

Reference material OREAS 187 is one of a suite of thirteen nickel laterite CRMs (OREAS 182 to OREAS 195) prepared from saprolitic ore source materials. These were supplied by Anglo American Brazil Limitada from the Codemin 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 Low 95% Confidence High Method
Ni, Nickel (wt.%) 1.37 0.009 1.36 1.39 Borate Fusion XRF
Co, Cobalt (ppm) 636 9 625 648 Borate Fusion XRF
Fe2O3, Iron(III) oxide (wt.%) 19.45 0.100 19.36 19.54 Borate Fusion XRF
Al2O3, Aluminium(III) oxide (wt.%) 2.80 0.027 2.78 2.82 Borate Fusion XRF
CaO, Calcium oxide (wt.%) 0.341 0.005 0.336 0.345 Borate Fusion XRF
Cr2O3, Chromium(III) oxide (ppm) 9869 106 9797 9941 Borate Fusion XRF
MgO, Magnesium oxide (wt.%) 17.99 0.103 17.89 18.08 Borate Fusion XRF
MnO, Manganese oxide (wt.%) 0.356 0.003 0.353 0.360 Borate Fusion XRF
SiO2, Silicon dioxide (wt.%) 46.66 0.227 46.53 46.78 Borate Fusion XRF
TiO2, Titanium dioxide (wt.%) 0.033 0.004 0.031 0.036 Borate Fusion XRF
Zn, Zinc (ppm) 196 8 187 204 Borate Fusion XRF
Al2O3, Aluminium(III) oxide (wt.%) 2.77 0.055 2.74 2.81 Borate / Peroxide Fusion ICP
CaO, Calcium oxide (wt.%) 0.352 0.026 0.329 0.374 Borate / Peroxide Fusion ICP
Co, Cobalt (ppm) 629 25 618 639 Borate / Peroxide Fusion ICP
Cr2O3, Chromium(III) oxide (ppm) 9868 245 9766 9970 Borate / Peroxide Fusion ICP
Fe2O3, Iron(III) oxide (wt.%) 19.40 0.364 19.16 19.65 Borate / Peroxide Fusion ICP
MgO, Magnesium oxide (wt.%) 17.96 0.370 17.82 18.09 Borate / Peroxide Fusion ICP
MnO, Manganese oxide (wt.%) 0.358 0.006 0.356 0.361 Borate / Peroxide Fusion ICP
Ni, Nickel (wt.%) 1.37 0.023 1.35 1.38 Borate / Peroxide Fusion ICP
SiO2, Silicon dioxide (wt.%) 46.37 0.905 45.68 47.07 Borate / Peroxide Fusion ICP
TiO2, Titanium dioxide (wt.%) 0.031 0.001 0.030 0.032 Borate / Peroxide Fusion ICP
Zn, Zinc (ppm) 190 8 179 201 Borate / Peroxide Fusion ICP
LOI1000, Loss on ignition @1000°C (wt.%) 9.27 0.117 9.11 9.44 Thermogravimetry
C, Carbon (wt.%) 0.105 0.011 0.093 0.118 Infrared Combustion
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