OREAS 185

Reference material OREAS 185 is one of a suite of thirteen nickel laterite CRMs (OREAS 182 to OREAS 195) prepared from saprolite 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.%) 1.14 0.009 1.13 1.15 Borate Fusion XRF
Co, Cobalt (ppm) 388 10 379 397 Borate Fusion XRF
Fe2O3, Iron(III) oxide (wt.%) 18.42 0.099 18.34 18.50 Borate Fusion XRF
Al2O3, Aluminium(III) oxide (wt.%) 2.48 0.020 2.47 2.50 Borate Fusion XRF
CaO, Calcium oxide (wt.%) 0.385 0.006 0.381 0.388 Borate Fusion XRF
Cr2O3, Chromium(III) oxide (ppm) 9137 132 9070 9203 Borate Fusion XRF
MgO, Magnesium oxide (wt.%) 20.22 0.111 20.11 20.33 Borate Fusion XRF
MnO, Manganese oxide (wt.%) 0.297 0.003 0.295 0.298 Borate Fusion XRF
SiO2, Silicon dioxide (wt.%) 45.93 0.196 45.77 46.08 Borate Fusion XRF
TiO2, Titanium dioxide (wt.%) 0.033 0.005 0.030 0.036 Borate Fusion XRF
Zn, Zinc (ppm) 143 7 136 150 Borate Fusion XRF
Al2O3, Aluminium(III) oxide (wt.%) 2.47 0.042 2.44 2.50 Borate / Peroxide Fusion ICP
CaO, Calcium oxide (wt.%) 0.387 0.016 0.376 0.399 Borate / Peroxide Fusion ICP
Co, Cobalt (ppm) 385 19 379 391 Borate / Peroxide Fusion ICP
Cr2O3, Chromium(III) oxide (ppm) 9103 239 8961 9245 Borate / Peroxide Fusion ICP
Fe2O3, Iron(III) oxide (wt.%) 18.27 0.382 18.03 18.51 Borate / Peroxide Fusion ICP
MgO, Magnesium oxide (wt.%) 20.17 0.404 19.91 20.44 Borate / Peroxide Fusion ICP
MnO, Manganese oxide (wt.%) 0.295 0.005 0.291 0.299 Borate / Peroxide Fusion ICP
Na2O, Sodium oxide (wt.%) 0.024 0.004 0.021 0.027 Borate / Peroxide Fusion ICP
Ni, Nickel (wt.%) 1.12 0.024 1.11 1.13 Borate / Peroxide Fusion ICP
SiO2, Silicon dioxide (wt.%) 45.58 0.879 45.00 46.16 Borate / Peroxide Fusion ICP
TiO2, Titanium dioxide (wt.%) 0.031 0.001 0.030 0.031 Borate / Peroxide Fusion ICP
LOI1000, Loss On Ignition @1000 °C (wt.%) 9.61 0.107 9.50 9.71 Thermogravimetry
C, Carbon (wt.%) 0.105 0.013 0.091 0.119 Infrared Combustion
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