OREAS 703

OREAS 703 is a new W–Bi–Mo certified reference material prepared from a blend of tungsten (WO₃) and bismuth concentrates from the Nui Phao polymetallic deposit (Vietnam), supplemented with molybdenum-bearing material, fluorite, limestone, and a granitic host matrix. This blend is designed to reflect the complex geochemical associations typical of W–Bi–Mo mineralisation systems, including elevated sulphur and fluorine.

OREAS 703 has been characterised using the following methods:

  • Borate Fusion XRF- Majors and some traces, including Loss on Ignition (LOI) at 1000 °C
  • Fluorine by ion selective electrode
  • Total S by infrared combustion furnace/CS analyser
  • Sodium peroxide fusion with full suite elemental package by ICP-OES and/or MS finish
  • 4-acid digestion for full suite elemental package by ICP-OES and MS finish

Certified values for applicable analytes are operationally defined for each method, with results included under OREAS ISO 17034 scope of accreditation.

Note: Analyte values are indicative only and may change when certified.

						

										

						
							

								Analyte
								
									
										Indicative Value									
								
								1SD
								Expanded Uncertainty Low
								Expanded Uncertainty High
								Method
							

						
						
															

									W, Tungsten (wt.%)
									0.563
									TBD
									TBD
									TBD
									Borate Fusion XRF
								

															

									Bi, Bismuth (wt.%)
									0.061
									TBD
									TBD
									TBD
									Borate Fusion XRF
								

															

									Mo, Molybdenum (wt.%)
									0.107
									TBD
									TBD
									TBD
									Borate Fusion XRF
								

															

									S, Sulphur (wt.%)
									0.660
									TBD
									TBD
									TBD
									Borate Fusion XRF
								

															

									F, Fluorine (wt.%)
									0.510
									TBD
									TBD
									TBD
									Ion Selective Electrode
								

													
					

				


				


									
Downloads

											Certificate
					
											DataPack
					SDS NRAM (226 KB)				

					

													
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Specifications