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我们知道钨矿中仅含微量钡.用过氧化氢法测定不但灵敏度不够,且受钼钛干扰.如用磷钨酸法则灵敏度亦不够高,且矿样中含有较大量硅时,会增加直接测定的困难.最近苏联?提出用铝试剂法测定钢中的钡,但由于钨矿中大量铝及其他干扰元素的存在,使测定手续复杂化.普通测定微量钒所用的抽提法,例如用哥罗芳提取8羟基喹啉与钒生成之化合物,由于钨、钼等之存在,抽提时有大量沉淀,使操作不能顺利进行.苏联?提出的联苯胺用于测定岩石
We know that tungsten contains only trace amounts of barium, which is not only underexposed by the hydrogen peroxide method, but also is disturbed by molybdenum and titanium. If phosphotungstic acid is not sensitive enough and there is a large amount of silicon in the sample, Determination of the difficulties recently proposed the use of aluminum reagent barium determination of steel, but due to a large number of tungsten in the presence of aluminum and other interfering elements of the measurement procedures to complicate the ordinary determination of trace vanadium extraction method used, for example with Colloquium extraction of 8-hydroxyquinoline and vanadium compounds generated, due to the presence of tungsten, molybdenum, etc., a large number of precipitated during extraction, so that the operation can not be carried out smoothly.The benzidine benzidine proposed for the determination of rock