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对高含量钨的测定常用重量法。在经常用的钨酸法中,沉淀被存于样品中的Sb、Cr、Fe、Mo、Nb、P、SiO_2、V、Ta及Sn污染,必须分离或予以校正。经常用的共沉淀剂辛可宁价格昂贵,各种钨酸盐沉淀法都受到多种干扰,沉淀最后需灼烧成氧化钨。8——羟基喹啉法受Mo、Ti及U的干扰,其他方面也不太令人满意,这些方法对单个样品的测定都需要好几个小时。一些容量法都基于在惰性气体中将W
The determination of high content of tungsten commonly used gravimetric method. In the commonly used tungstic acid method, the precipitate is contaminated by Sb, Cr, Fe, Mo, Nb, P, SiO 2, V, Ta and Sn stored in the sample and must be separated or corrected. Commonly used coprecipitating cinchonine is expensive, various tungstate precipitation methods are subject to a variety of interference, the final precipitation of the precipitate into tungsten oxide. The 8-hydroxy quinoline method is disturbed by Mo, Ti and U and is not entirely satisfactory in other respects. These methods require several hours for the determination of a single sample. Some volumetric methods are based on the inert gas