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本方法应用国产732型阳离子交换树脂分离去主量铟和其他金属阳离子(痕量硫以SO_4~(2-)状态存在),加入铬酸钡进行置换沉淀反应 SO_4~(2-)+BaCrO_4(?)BaSO_4+CrO_4~(2-)借二苯偕肼与铬(Ⅵ)的灵敏显色反应对痕量硫进行间接分光光度测定. 为了提高间接测定硫的灵敏度,必须降低BaCrO_4与BaSO_4的溶解度.我们采取加入无水乙醇的办法,效果较好. 一主要试剂和仪器硫标准液:以一级硫酸钾配制。酸性铬酸钡饱和液:5克精制的铬酸钡粉末溶于400ml含0.5N冰乙酸和0.01N盐酸混合液中,摇
In this method, the major amount of indium and other metal cations are separated by using domestic 732 cation exchange resin (the trace sulfur exists in the state of SO_4 ~ (2-)), and barium chromate is added to perform displacement reaction of SO_4 ~ (2 +) + BaCrO_4 ?) Indirect spectrophotometric determination of trace sulfur by BaSO4 + CrO4- (2-) by sensitive color reaction of diphenylhydrazine and chromium (VI) To increase the sensitivity of indirect determination of sulfur, the solubility of BaCrO4 and BaSO4 must be reduced We take the method of adding ethanol, the better. A major reagents and equipment sulfur standard solution: a potassium sulfate preparation. Saturated acid barium chromate solution: 5 g refined barium chromate powder was dissolved in 400ml 0.5N glacial acetic acid and 0.01N hydrochloric acid mixture, shake