OREAS 192
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Description
Description
Reference material OREAS 192 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 Limits Low
|
95% Confidence Limits High
|
Method
|
|---|---|---|---|---|---|
| Ni, Nickel (wt.%) | 1.77 | 0.015 | 1.76 | 1.79 | Borate Fusion XRF |
| Co, Cobalt (ppm) | 404 | 9 | 399 | 410 | Borate Fusion XRF |
| Fe2O3, Iron(III) oxide (wt.%) | 18.10 | 0.082 | 18.02 | 18.17 | Borate Fusion XRF |
| Al2O3, Aluminium(III) oxide (wt.%) | 2.76 | 0.028 | 2.74 | 2.78 | Borate Fusion XRF |
| CaO, Calcium oxide (wt.%) | 0.313 | 0.006 | 0.309 | 0.317 | Borate Fusion XRF |
| Cr2O3, Chromium(III) oxide (ppm) | 9129 | 109 | 9068 | 9191 | Borate Fusion XRF |
| MgO, Magnesium oxide (wt.%) | 21.32 | 0.131 | 21.22 | 21.43 | Borate Fusion XRF |
| MnO, Manganese oxide (wt.%) | 0.277 | 0.004 | 0.275 | 0.280 | Borate Fusion XRF |
| SiO2, Silicon dioxide (wt.%) | 43.58 | 0.163 | 43.42 | 43.74 | Borate Fusion XRF |
| TiO2, Titanium dioxide (wt.%) | 0.036 | 0.004 | 0.033 | 0.040 | Borate Fusion XRF |
| Zn, Zinc (ppm) | 176 | 7 | 168 | 184 | Borate Fusion XRF |
| Al2O3, Aluminium(III) oxide (wt.%) | 2.75 | 0.058 | 2.71 | 2.79 | Borate / Peroxide Fusion ICP |
| CaO, Calcium oxide (wt.%) | 0.316 | 0.025 | 0.302 | 0.331 | Borate / Peroxide Fusion ICP |
| Co, Cobalt (ppm) | 398 | 17 | 394 | 403 | Borate / Peroxide Fusion ICP |
| Cr2O3, Chromium(III) oxide (ppm) | 9104 | 216 | 9047 | 9160 | Borate / Peroxide Fusion ICP |
| Fe2O3, Iron(III) oxide (wt.%) | 18.14 | 0.435 | 17.89 | 18.40 | Borate / Peroxide Fusion ICP |
| MgO, Magnesium oxide (wt.%) | 21.26 | 0.455 | 20.90 | 21.62 | Borate / Peroxide Fusion ICP |
| MnO, Manganese oxide (wt.%) | 0.278 | 0.007 | 0.275 | 0.281 | Borate / Peroxide Fusion ICP |
| Na2O, Sodium oxide (wt.%) | 0.022 | 0.004 | 0.020 | 0.024 | Borate / Peroxide Fusion ICP |
| Ni, Nickel (wt.%) | 1.75 | 0.038 | 1.73 | 1.77 | Borate / Peroxide Fusion ICP |
| SiO2, Silicon dioxide (wt.%) | 43.45 | 0.704 | 42.96 | 43.94 | Borate / Peroxide Fusion ICP |
| TiO2, Titanium dioxide (wt.%) | 0.033 | 0.003 | 0.030 | 0.035 | Borate / Peroxide Fusion ICP |
| Zn, Zinc (ppm) | 193 | 14 | 173 | 212 | Borate / Peroxide Fusion ICP |
| LOI1000, Loss On Ignition @1000 °C (wt.%) | 10.17 | 0.114 | 10.02 | 10.32 | Thermogravimetry |
| C, Carbon (wt.%) | 0.073 | 0.012 | 0.062 | 0.084 | Infrared Combustion |
