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锶的分析在环保、医学、地质和工业上都有重要的意义.目前,锶的测定缺乏简单可行的光度分析法.有人曾讨论过测定碱土元素的光度法所用的有机试剂.文献还报道过一些测锶的方法,但这些方法选择性不够完善,没有很好解决钙、钡共存的干扰,往往需要进行分离后才能测定.有人虽报道过一些不需分离的测定锶的方法,但这些方法允许共存的钙、钡等离子的量较小,实际应用价值不大.本文研究了新显色剂——二溴一氯偶氮氯膦(简称DBC-偶氮氯膦)与锶的显色反应及其在锶分析上的应用.结果表明:锶与 DBC-偶氮氯膦在酸性条件下生成一种稳定的蓝紫色配合物.在丙酮、EDTA 和 Na_2 SO_4 存在下,采用双波长分光光度法有效地解决钙、钡、镁、铁等三十余种元素的干扰.用本法测定了海水、氧化镁试剂和硅铁合金中的锶,结果颇为满意.
The analysis of strontium is of great importance in environmental protection, medicine, geology and industry.At present, the determination of strontium lacks a simple and feasible spectrophotometric method.It has been discussed that the organic reagents used for the photometric determination of alkaline earth elements have been reported Some methods of measuring strontium, but these methods are not perfect enough selectivity, not well solve the interference of calcium and barium coexist, often need to be separated before the determination.It has been reported that some of the methods without stripping strontium determination, but these methods The amount of calcium and barium that are allowed to coexist is small, and the practical application value is small.In this paper, the color reaction of dibromochloridochlorophosphine (DBC-chlorophosphonazo) with strontium And its application in the analysis of strontium.The results show that strontium and DBC-chlorophosphonazo form a stable blue-violet complex under acidic conditions.Under the conditions of acetone, EDTA and Na 2 SO 4, double-wavelength spectrophotometry Effectively solve the interference of more than thirty kinds of elements such as calcium, barium, magnesium, iron, etc. The seawater, magnesia reagent and strontium in ferrosilicon alloy are measured by this method, and the results are quite satisfactory.