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本文叙述了用巯基棉富集—阳极溶出伏安法测定水中痕量砷和硒的方法。将水样经盐酸酸化成1M酸度后通过巯基棉富集,以NaCl饱和的6N HCl洗脱干扰离子,然后用H_2SO_4—H_2O_2消解此巯基棉,消解液分成两份,一份在HClO_4存在下以金膜玻炭为工作电极阳极溶出法直接测定Se(Ⅳ),另一份用硫酸肼将As(Ⅴ)还原为As(Ⅲ)后也用同法测定。并就巯基棉的制备方法和性质进行了一些探索。
This paper describes a method for the determination of trace amounts of arsenic and selenium in water with thiol-cotton-anodic stripping voltammetry. The water sample was acidified by hydrochloric acid into 1M acidity and then enriched by sulfhydryl cotton. The interference ions were eluted with 6N HCl saturated with NaCl. Then, the sulfhydryl cotton was digested with H 2 SO 4 -H 2 O 2. The digestion solution was divided into two parts, one in the presence of HClO 4 The gold electrodeposited glassy carbon electrode was used for the direct determination of Se (Ⅳ) by the anodic stripping method, and the other method was also determined by the same method after reducing the As (Ⅴ) to As (Ⅲ) with hydrazine sulfate. The preparation methods and properties of thiols were discussed.