OREAS 195

Reference material OREAS 195 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 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 Low 95% Confidence High Method
Ni, Nickel (wt.%) 2.94 0.029 2.92 2.97 Borate Fusion XRF
Co, Cobalt (ppm) 477 10 469 486 Borate Fusion XRF
Fe2O3, Iron(III) oxide (wt.%) 18.29 0.086 18.19 18.40 Borate Fusion XRF
Al2O3, Aluminium(III) oxide (wt.%) 3.13 0.031 3.11 3.15 Borate Fusion XRF
CaO, Calcium oxide (wt.%) 0.390 0.005 0.387 0.393 Borate Fusion XRF
Cr2O3, Chromium(III) oxide (ppm) 9585 113 9504 9666 Borate Fusion XRF
MgO, Magnesium oxide (wt.%) 19.01 0.114 18.90 19.12 Borate Fusion XRF
MnO, Manganese oxide (wt.%) 0.288 0.004 0.284 0.291 Borate Fusion XRF
SiO2, Silicon dioxide (wt.%) 44.00 0.190 43.81 44.18 Borate Fusion XRF
TiO2, Titanium dioxide (wt.%) 0.037 0.005 0.035 0.039 Borate Fusion XRF
Zn, Zinc (ppm) 300 7 291 308 Borate Fusion XRF
Al2O3, Aluminium(III) oxide (wt.%) 3.07 0.063 3.02 3.13 Borate / Peroxide Fusion ICP
CaO, Calcium oxide (wt.%) 0.397 0.017 0.380 0.415 Borate / Peroxide Fusion ICP
Co, Cobalt (ppm) 465 19 459 471 Borate / Peroxide Fusion ICP
Cr2O3, Chromium(III) oxide (ppm) 9383 279 9296 9469 Borate / Peroxide Fusion ICP
Fe2O3, Iron(III) oxide (wt.%) 18.16 0.414 17.81 18.51 Borate / Peroxide Fusion ICP
MgO, Magnesium oxide (wt.%) 18.88 0.481 18.55 19.22 Borate / Peroxide Fusion ICP
MnO, Manganese oxide (wt.%) 0.285 0.007 0.281 0.289 Borate / Peroxide Fusion ICP
Na2O, Sodium oxide (wt.%) 0.031 0.002 0.029 0.032 Borate / Peroxide Fusion ICP
Ni, Nickel (wt.%) 2.89 0.048 2.86 2.93 Borate / Peroxide Fusion ICP
SiO2, Silicon dioxide (wt.%) 43.30 0.840 42.64 43.96 Borate / Peroxide Fusion ICP
TiO2, Titanium dioxide (wt.%) 0.037 0.003 0.034 0.040 Borate / Peroxide Fusion ICP
Zn, Zinc (ppm) 293 18 270 316 Borate / Peroxide Fusion ICP
LOI1000, Loss On Ignition @1000°C (wt.%) 9.71 0.123 9.52 9.90 Thermogravimetry
C, Carbon (wt.%) 0.076 0.013 0.064 0.088 Infrared Combustion
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