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铟在卤化物的支持电解质中均得良好极谱波。但干扰较多,须经繁冗的分离才能测定。后来有人提出:在EDTA强碱性溶液中,加三乙醇胺使铁络合,以镁作共沉淀剂,使铟定量沉淀。然后用盐酸溶解,蒸干,于0.58MHCl——1MKBr——2％抗坏血酸底液中方波极谱测定铟,获得良好结果。我们在文献的基础上,结合我厂实际情况,对干扰元素,共沉淀分离的条件等方面进行试验,并作了某些改进,使方法更快速、准确。用于烟尘、铜渣、铅渣、镉渣等中铟的测定,获得与结晶紫比色法相符合的结果,且结果的再现性比比色法好。
Indium has a good polarographic wave in the halide supporting electrolyte. But more interference, to be determined after the separation of laborious. It was later proposed: strong alkaline EDTA solution, add triethanolamine iron complex, with magnesium as a coprecipitant, quantitative precipitation of indium. Then, it was dissolved in hydrochloric acid and evaporated to dryness. The results of square wave polarography of indium in 0.58M HCl - 1M KBr - 2% ascorbic acid solution showed good results. Based on the literature and based on the actual situation of our factory, we conducted experiments on the interfering elements and conditions of coprecipitation and separation, and made some improvements to make the method more rapid and accurate. For the determination of indium in soot, copper slag, lead slag, cadmium residue and the like, the results in accordance with the crystal violet colorimetric method are obtained, and the reproducibility of the results is better than the colorimetric method.