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本文研究了三羟基-4′-磺基偶氯苯(TSAB)与钨(Ⅵ)的显色反应.结果表明,在0.02~0.18mol/L HCl的酸度范围内,钨与TSAB形成很稳定的组成为1:2的橙红色络合物,其最大吸收波长为460nm,表观摩尔吸光系数为2.09×10~4,含钨量0~90μg/25ml范围内服从比尔定律.除钼的干扰较严重外,方法具有良好的选择性,可不经分离直接测定某些不含钼或含微量钼的钢铁中钨,测定结果令人满意.
In this paper, the color reaction of trihydroxy-4’-sulfo-5-chlorobenzene (TSAB) with tungsten (Ⅵ) has been studied.The results show that the formation of tungsten and TSAB is very stable in the acidity range of 0.02 ~ 0.18mol / The orange-red complex with the composition of 1: 2 has the maximum absorption wavelength of 460 nm, the apparent molar absorptivity of 2.09 × 10 -4, and the content of tungsten in the range of 0-90 μg / 25 ml. Serious, the method has good selectivity, can be directly measured without separation of certain molybdenum or molybdenum content of tungsten in steel, the determination of satisfactory.