OREAS 189

Reference material OREAS 189 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 Limits Low 95% Confidence Limits High Method
Ni, Nickel (wt.%) 1.48 0.015 1.47 1.49 Borate Fusion XRF
Co, Cobalt (ppm) 326 9 320 333 Borate Fusion XRF
Fe2O3, Iron(III) oxide (wt.%) 15.04 0.098 14.97 15.11 Borate Fusion XRF
Al2O3, Aluminium(III) oxide (wt.%) 2.09 0.019 2.08 2.10 Borate Fusion XRF
CaO, Calcium oxide (wt.%) 0.326 0.005 0.323 0.329 Borate Fusion XRF
Cr2O3, Chromium(III) oxide (ppm) 7648 94 7585 7710 Borate Fusion XRF
MgO, Magnesium oxide (wt.%) 23.09 0.144 22.99 23.20 Borate Fusion XRF
MnO, Manganese oxide (wt.%) 0.227 0.003 0.225 0.229 Borate Fusion XRF
SiO2, Silicon dioxide (wt.%) 46.20 0.216 46.05 46.35 Borate Fusion XRF
TiO2, Titanium dioxide (wt.%) 0.029 0.006 0.026 0.032 Borate Fusion XRF
Zn, Zinc (ppm) 125 7 121 129 Borate Fusion XRF
Al2O3, Aluminium(III) oxide (wt.%) 2.08 0.044 2.05 2.11 Borate / Peroxide Fusion ICP
CaO, Calcium oxide (wt.%) 0.328 0.028 0.306 0.351 Borate / Peroxide Fusion ICP
Co, Cobalt (ppm) 327 16 315 339 Borate / Peroxide Fusion ICP
Cr2O3, Chromium(III) oxide (ppm) 7643 203 7558 7729 Borate / Peroxide Fusion ICP
Fe2O3, Iron(III) oxide (wt.%) 14.94 0.309 14.74 15.14 Borate / Peroxide Fusion ICP
MgO, Magnesium oxide (wt.%) 23.06 0.390 22.87 23.26 Borate / Peroxide Fusion ICP
MnO, Manganese oxide (wt.%) 0.228 0.004 0.226 0.231 Borate / Peroxide Fusion ICP
Na2O, Sodium oxide (wt.%) 0.021 0.004 0.019 0.024 Borate / Peroxide Fusion ICP
Ni, Nickel (wt.%) 1.47 0.022 1.45 1.48 Borate / Peroxide Fusion ICP
SiO2, Silicon dioxide (wt.%) 46.08 0.912 45.64 46.52 Borate / Peroxide Fusion ICP
TiO2, Titanium dioxide (wt.%) 0.026 0.003 0.023 0.028 Borate / Peroxide Fusion ICP
LOI1000, Loss On Ignition @1000°C (wt.%) 10.12 0.117 9.98 10.27 Thermogravimetry
C, Carbon (wt.%) 0.096 0.011 0.083 0.109 Infrared Combustion
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