OREAS 194

Reference material OREAS 194 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.%) 2.13 0.020 2.11 2.15 Borate Fusion XRF
Co, Cobalt (ppm) 428 12 419 437 Borate Fusion XRF
Fe2O3, Iron(III) oxide (wt.%) 16.47 0.086 16.40 16.54 Borate Fusion XRF
Al2O3, Aluminium(III) oxide (wt.%) 2.74 0.028 2.72 2.76 Borate Fusion XRF
CaO, Calcium oxide (wt.%) 0.311 0.005 0.307 0.315 Borate Fusion XRF
Cr2O3, Chromium(III) oxide (ppm) 8191 111 8112 8270 Borate Fusion XRF
MgO, Magnesium oxide (wt.%) 22.83 0.151 22.72 22.94 Borate Fusion XRF
MnO, Manganese oxide (wt.%) 0.261 0.004 0.259 0.263 Borate Fusion XRF
SiO2, Silicon dioxide (wt.%) 43.02 0.222 42.86 43.17 Borate Fusion XRF
TiO2, Titanium dioxide (wt.%) 0.035 0.005 0.032 0.037 Borate Fusion XRF
Zn, Zinc (ppm) 174 8 166 183 Borate Fusion XRF
Al2O3, Aluminium(III) oxide (wt.%) 2.73 0.055 2.69 2.77 Borate / Peroxide Fusion ICP
CaO, Calcium oxide (wt.%) 0.320 0.026 0.300 0.339 Borate / Peroxide Fusion ICP
Co, Cobalt (ppm) 424 19 416 432 Borate / Peroxide Fusion ICP
Cr2O3, Chromium(III) oxide (ppm) 8142 254 8061 8224 Borate / Peroxide Fusion ICP
Fe2O3, Iron(III) oxide (wt.%) 16.42 0.381 16.22 16.62 Borate / Peroxide Fusion ICP
MgO, Magnesium oxide (wt.%) 22.77 0.466 22.54 22.99 Borate / Peroxide Fusion ICP
MnO, Manganese oxide (wt.%) 0.262 0.007 0.259 0.265 Borate / Peroxide Fusion ICP
Na2O, Sodium oxide (wt.%) 0.027 0.004 0.023 0.031 Borate / Peroxide Fusion ICP
Ni, Nickel (wt.%) 2.10 0.041 2.08 2.13 Borate / Peroxide Fusion ICP
SiO2, Silicon dioxide (wt.%) 42.90 0.784 42.23 43.57 Borate / Peroxide Fusion ICP
TiO2, Titanium dioxide (wt.%) 0.033 0.003 0.031 0.035 Borate / Peroxide Fusion ICP
Zn, Zinc (ppm) 184 16 165 203 Borate / Peroxide Fusion ICP
LOI1000, Loss On Ignition @1000 °C (wt.%) 10.53 0.108 10.41 10.66 Thermogravimetry
C, Carbon (wt.%) 0.073 0.012 0.062 0.085 Infrared Combustion
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