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提出了以钽为内标波长色散X射线荧光光谱法测定钨精矿中WO3的新方法。以Na2B4O7和Li2B4O7(质量比65:35)的混合物作为熔剂,Ta2O5为内标,同时加入LiNO3为氧化剂,在1200℃下进行熔融制样,最后将本方法应用于实际样品的分析,结果表明,以钽作为内标测定WO3,不仅可以在很大程度上降低实验操作和仪器测量带来的偏差,也可以消除基体效应的影响。方法用于测定白钨精矿和黑钨精矿中WO3,其准确度和精密度优于重量分析法。
A new method for the determination of WO3 in tungsten concentrates by using tantalum as internal standard wavelength-resolved X-ray fluorescence spectrometry was proposed. The method was applied to the analysis of the actual samples with a mixture of Na2B4O7 and Li2B4O7 (mass ratio of 65:35) as a flux, Ta2O5 as an internal standard, and LiNO3 as an oxidant at 1200 ° C for melting. The determination of WO3 using tantalum as an internal standard not only reduces the bias caused by experimental operation and instrument measurement to a large extent, but also eliminates the effect of matrix effect. The method was applied to the determination of WO3 in scheelite and wolframite concentrates with better accuracy and precision than the gravimetric method.