论文部分内容阅读
锡的极谱测定,前人已做了大量的工作,并提出了一些不同的方案。但是到目前为止,应用较为广泛的还是盐酸-氯化铵和硫酸-氯化钠等底液。在这些底液中,共同存在的问题是铅的定量干扰和灵敏度不高。因此需要预先分离才能测定。为了分离铅,采用在氨性介质中并有EDTA的存在下,以铍作载体使锡与其他元素分离,但手续繁琐;也有的使铅呈硫酸铅沉淀与锡分离,虽然操作简单,但往往分离不完全。Kolthoff曾提出在盐酸-氯
Tin spectroscopy, predecessors have done a lot of work, and put forward some different programs. But so far, the more widely used is hydrochloric acid - ammonium chloride and sulfuric acid - sodium chloride and other bottom liquid. In these base fluids, the common problem is the quantitative lead interference and sensitivity is not high. Therefore need to be separated in advance to measure. In order to separate the lead, the beryllium is used as a carrier to separate the tin from other elements in the presence of EDTA in the ammoniacal medium, but the procedures are complicated; some lead is precipitated with lead sulfate and separated from tin. Although the operation is simple, Separation is incomplete. Kolthoff has proposed in hydrochloric acid - chlorine