OREAS 192

Reference material OREAS 192 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 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.%) 1.77 0.015 1.76 1.79 Borate Fusion XRF
Co, Cobalt (ppm) 404 9 399 410 Borate Fusion XRF
Fe2O3, Iron(III) oxide (wt.%) 18.10 0.082 18.02 18.17 Borate Fusion XRF
Al2O3, Aluminium(III) oxide (wt.%) 2.76 0.028 2.74 2.78 Borate Fusion XRF
CaO, Calcium oxide (wt.%) 0.313 0.006 0.309 0.317 Borate Fusion XRF
Cr2O3, Chromium(III) oxide (ppm) 9129 109 9068 9191 Borate Fusion XRF
MgO, Magnesium oxide (wt.%) 21.32 0.131 21.22 21.43 Borate Fusion XRF
MnO, Manganese oxide (wt.%) 0.277 0.004 0.275 0.280 Borate Fusion XRF
SiO2, Silicon dioxide (wt.%) 43.58 0.163 43.42 43.74 Borate Fusion XRF
TiO2, Titanium dioxide (wt.%) 0.036 0.004 0.033 0.040 Borate Fusion XRF
Zn, Zinc (ppm) 176 7 168 184 Borate Fusion XRF
Al2O3, Aluminium(III) oxide (wt.%) 2.75 0.058 2.71 2.79 Borate / Peroxide Fusion ICP
CaO, Calcium oxide (wt.%) 0.316 0.025 0.302 0.331 Borate / Peroxide Fusion ICP
Co, Cobalt (ppm) 398 17 394 403 Borate / Peroxide Fusion ICP
Cr2O3, Chromium(III) oxide (ppm) 9104 216 9047 9160 Borate / Peroxide Fusion ICP
Fe2O3, Iron(III) oxide (wt.%) 18.14 0.435 17.89 18.40 Borate / Peroxide Fusion ICP
MgO, Magnesium oxide (wt.%) 21.26 0.455 20.90 21.62 Borate / Peroxide Fusion ICP
MnO, Manganese oxide (wt.%) 0.278 0.007 0.275 0.281 Borate / Peroxide Fusion ICP
Na2O, Sodium oxide (wt.%) 0.022 0.004 0.020 0.024 Borate / Peroxide Fusion ICP
Ni, Nickel (wt.%) 1.75 0.038 1.73 1.77 Borate / Peroxide Fusion ICP
SiO2, Silicon dioxide (wt.%) 43.45 0.704 42.96 43.94 Borate / Peroxide Fusion ICP
TiO2, Titanium dioxide (wt.%) 0.033 0.003 0.030 0.035 Borate / Peroxide Fusion ICP
Zn, Zinc (ppm) 193 14 173 212 Borate / Peroxide Fusion ICP
LOI1000, Loss On Ignition @1000 °C (wt.%) 10.17 0.114 10.02 10.32 Thermogravimetry
C, Carbon (wt.%) 0.073 0.012 0.062 0.084 Infrared Combustion
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