OREAS 183

Reference material OREAS 183 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.%) 0.995 0.010 0.987 1.003 Borate Fusion XRF
Co, Cobalt (ppm) 225 8 217 234 Borate Fusion XRF
Fe2O3, Iron(III) oxide (wt.%) 12.73 0.068 12.67 12.78 Borate Fusion XRF
Al2O3, Aluminium(III) oxide (wt.%) 1.60 0.017 1.58 1.61 Borate Fusion XRF
CaO, Calcium oxide (wt.%) 0.710 0.007 0.704 0.716 Borate Fusion XRF
Cr2O3, Chromium(III) oxide (ppm) 6529 78 6476 6581 Borate Fusion XRF
MgO, Magnesium oxide (wt.%) 27.31 0.162 27.19 27.42 Borate Fusion XRF
MnO, Manganese oxide (wt.%) 0.180 0.002 0.179 0.181 Borate Fusion XRF
P2O5, Phosphorus(V) oxide (wt.%) 0.005 0.001 0.002 0.007 Borate Fusion XRF
SiO2, Silicon dioxide (wt.%) 44.49 0.153 44.38 44.60 Borate Fusion XRF
TiO2, Titanium dioxide (wt.%) 0.023 0.005 0.020 0.025 Borate Fusion XRF
Zn, Zinc (ppm) 78 5.7 68 88 Borate Fusion XRF
Al2O3, Aluminium(III) oxide (wt.%) 1.60 0.032 1.58 1.63 Borate / Peroxide Fusion ICP
CaO, Calcium oxide (wt.%) 0.716 0.027 0.690 0.742 Borate / Peroxide Fusion ICP
Co, Cobalt (ppm) 222 11 215 229 Borate / Peroxide Fusion ICP
Cr2O3, Chromium(III) oxide (ppm) 6514 194 6412 6617 Borate / Peroxide Fusion ICP
Fe2O3, Iron(III) oxide (wt.%) 12.72 0.260 12.61 12.83 Borate / Peroxide Fusion ICP
MgO, Magnesium oxide (wt.%) 27.43 0.599 27.15 27.71 Borate / Peroxide Fusion ICP
MnO, Manganese oxide (wt.%) 0.181 0.005 0.179 0.183 Borate / Peroxide Fusion ICP
Na2O, Sodium oxide (wt.%) 0.030 0.003 0.026 0.034 Borate / Peroxide Fusion ICP
Ni, Nickel (wt.%) 0.983 0.018 0.974 0.993 Borate / Peroxide Fusion ICP
P2O5, Phosphorus(V) oxide (wt.%) < 0.010 IND IND IND Borate / Peroxide Fusion ICP
SiO2, Silicon dioxide (wt.%) 44.12 0.666 43.74 44.51 Borate / Peroxide Fusion ICP
TiO2, Titanium dioxide (wt.%) 0.020 0.001 0.020 0.021 Borate / Peroxide Fusion ICP
Zn, Zinc (ppm) 82 8.1 69 95 Borate / Peroxide Fusion ICP
LOI1000, Loss On Ignition @1000°C (wt.%) 10.90 0.104 10.79 11.01 Thermogravimetry
C, Carbon (wt.%) 0.217 0.016 0.199 0.235 Infrared Combustion
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