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在弱酸性溶液中，在ＣＴＡＢ存在下，钨与詆唑形成了一种组成比为１：２，吸收峰位于５１４——５２０毫微米间的络合物，其摩尔吸光系数为ε５１８＝７．６Ｘ１０４。在２５毫升溶液中含钨量在０—４８微克范围内遵守比耳定律，方法具有较高的灵敏度和选择性，用于测定合金钢中的含钨量时得到满意结果．
In weak acid solution, the complex of tungsten with the formicillin in the presence of CTAB has a molar ratio of ε518 = 7 with a composition ratio of 1: 2 and an absorption peak of 514 - 520 nm. 6X104. Beer’s law is obeyed in the range of 0-48 micrograms tungsten in 25 ml of solution. The method has high sensitivity and selectivity and satisfactory results for determination of tungsten content in alloy steel.