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汞盐-重铬酸钾滴定法测定铁为经典方法,操作简便,结果可靠。但需用剧毒试剂汞盐,造成环境污染。因此,为实现无汞测铁,前人做了不少工作,但是,由于不能避免铜的干扰需预先分离。近年也有在含铜溶液中不需分离直接测定铁的报导,但用于批量样品的日常分析尚有困难。七十年代以来,硼氢化钾(钠)还原剂已广泛用于分析化学领域,也曾用它作还原剂测定铁,但铜含量大于0.02毫克仍需分离。本文试验研究了以硼氢化钾(钠)作为还原剂,
Mercury salt - potassium dichromate titration method for the determination of iron as a classic method, easy to operate, the results are reliable. But need to use highly toxic reagent mercury salt, causing environmental pollution. Therefore, in order to achieve mercury-free iron measurement, a great deal of work has been done by predecessors. However, it is necessary to separate beforehand because copper can not be avoided. In recent years there have been reports of the direct determination of iron in copper-containing solutions without isolation, but the routine analysis of bulk samples is still difficult. Since the seventies, potassium borohydride (sodium) reductant has been widely used in the field of analytical chemistry, but also used it as a reducing agent for the determination of iron, but copper content greater than 0.02 mg still need to be separated. In this paper, the experimental study of potassium borohydride (sodium) as a reducing agent,