OREAS 191

Reference material OREAS 191 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.%) 1.75 0.017 1.74 1.77 Borate Fusion XRF
Co, Cobalt (ppm) 665 18 655 675 Borate Fusion XRF
Fe2O3, Iron(III) oxide (wt.%) 24.86 0.150 24.72 25.00 Borate Fusion XRF
Al2O3, Aluminium(III) oxide (wt.%) 4.27 0.034 4.25 4.29 Borate Fusion XRF
CaO, Calcium oxide (wt.%) 0.276 0.005 0.273 0.279 Borate Fusion XRF
Cr2O3, Chromium(III) oxide (ppm) 12242 114 12151 12333 Borate Fusion XRF
MgO, Magnesium oxide (wt.%) 10.06 0.076 9.99 10.12 Borate Fusion XRF
MnO, Manganese oxide (wt.%) 0.397 0.004 0.393 0.401 Borate Fusion XRF
SiO2, Silicon dioxide (wt.%) 47.97 0.256 47.78 48.15 Borate Fusion XRF
TiO2, Titanium dioxide (wt.%) 0.052 0.005 0.049 0.055 Borate Fusion XRF
Zn, Zinc (ppm) 302 8 291 313 Borate Fusion XRF
Al2O3, Aluminium(III) oxide (wt.%) 4.19 0.076 4.14 4.24 Borate / Peroxide Fusion ICP
CaO, Calcium oxide (wt.%) 0.287 0.011 0.278 0.296 Borate / Peroxide Fusion ICP
Co, Cobalt (ppm) 652 25 639 664 Borate / Peroxide Fusion ICP
Cr2O3, Chromium(III) oxide (ppm) 12139 358 11990 12287 Borate / Peroxide Fusion ICP
Cu, Copper (ppm) 53 6 49 56 Borate / Peroxide Fusion ICP
Fe2O3, Iron(III) oxide (wt.%) 24.63 0.577 24.21 25.06 Borate / Peroxide Fusion ICP
MgO, Magnesium oxide (wt.%) 9.95 0.285 9.76 10.13 Borate / Peroxide Fusion ICP
MnO, Manganese oxide (wt.%) 0.397 0.007 0.392 0.402 Borate / Peroxide Fusion ICP
Ni, Nickel (wt.%) 1.73 0.034 1.71 1.76 Borate / Peroxide Fusion ICP
SiO2, Silicon dioxide (wt.%) 47.67 1.004 46.92 48.43 Borate / Peroxide Fusion ICP
TiO2, Titanium dioxide (wt.%) 0.050 0.001 0.049 0.051 Borate / Peroxide Fusion ICP
Zn, Zinc (ppm) 297 8 288 305 Borate / Peroxide Fusion ICP
LOI1000, Loss On Ignition @1000 °C (wt.%) 8.10 0.176 7.88 8.32 Thermogravimetry
C, Carbon (wt.%) 0.086 0.010 0.072 0.100 Infrared Combustion
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