OREAS 184

Reference material OREAS 184 is one of a suite of thirteen nickel laterite CRMs (OREAS 182 to OREAS 195) prepared from transitional 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.%) 1.02 0.009 1.01 1.02 Borate Fusion XRF
Co, Cobalt (ppm) 903 14 889 916 Borate Fusion XRF
Fe2O3, Iron(III) oxide (wt.%) 39.30 0.196 39.13 39.47 Borate Fusion XRF
Al2O3, Aluminium(III) oxide (wt.%) 4.62 0.031 4.60 4.64 Borate Fusion XRF
CaO, Calcium oxide (wt.%) 0.216 0.005 0.213 0.220 Borate Fusion XRF
Cr2O3, Chromium(III) oxide (ppm) 17500 140 17372 17628 Borate Fusion XRF
MgO, Magnesium oxide (wt.%) 3.05 0.023 3.03 3.06 Borate Fusion XRF
MnO, Manganese oxide (wt.%) 0.676 0.005 0.671 0.681 Borate Fusion XRF
P2O5, Phosphorus(V) oxide (wt.%) 0.017 0.002 0.016 0.018 Borate Fusion XRF
SiO2, Silicon dioxide (wt.%) 42.25 0.176 42.18 42.33 Borate Fusion XRF
TiO2, Titanium dioxide (wt.%) 0.060 0.004 0.058 0.062 Borate Fusion XRF
Zn, Zinc (ppm) 278 15 267 290 Borate Fusion XRF
Al2O3, Aluminium(III) oxide (wt.%) 4.58 0.095 4.54 4.63 Borate / Peroxide Fusion ICP
CaO, Calcium oxide (wt.%) 0.231 0.039 0.207 0.256 Borate / Peroxide Fusion ICP
Co, Cobalt (ppm) 899 30 884 914 Borate / Peroxide Fusion ICP
Cr2O3, Chromium(III) oxide (ppm) 17464 461 17224 17704 Borate / Peroxide Fusion ICP
Cu, Copper (ppm) 60 6 56 64 Borate / Peroxide Fusion ICP
Fe2O3, Iron(III) oxide (wt.%) 39.42 0.667 39.08 39.76 Borate / Peroxide Fusion ICP
MgO, Magnesium oxide (wt.%) 3.00 0.067 2.96 3.03 Borate / Peroxide Fusion ICP
MnO, Manganese oxide (wt.%) 0.678 0.014 0.670 0.685 Borate / Peroxide Fusion ICP
Ni, Nickel (wt.%) 1.02 0.019 1.00 1.03 Borate / Peroxide Fusion ICP
SiO2, Silicon dioxide (wt.%) 42.19 0.807 41.69 42.68 Borate / Peroxide Fusion ICP
TiO2, Titanium dioxide (wt.%) 0.058 0.004 0.056 0.060 Borate / Peroxide Fusion ICP
Zn, Zinc (ppm) 287 9 273 300 Borate / Peroxide Fusion ICP
LOI1000, Loss On Ignition @1000 °C (wt.%) 6.24 0.104 6.12 6.36 Thermogravimetry
C, Carbon (wt.%) 0.067 0.008 0.059 0.075 Infrared Combustion
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