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利用钒(Ⅳ)作催化剂,在硫酸—氯化钠体系中测定矿石中的锡已得到了广泛的应用。在此基础上,我们对几种卤化物作了比较试验,发现加入溴化钠对测定锡的灵敏度最高。通过试验拟定了硫酸—钒(Ⅳ)—溴化钠催化极谱法测定矿石中低含量锡的方法。铅干扰锡的测定,可在硫酸介质中加氯化钡作载体使之生成硫酸铅沉淀消除,在该方法条件下,锡在0—50微克/20毫升之间,波高与浓度呈直线关系。本法经过几个矿区近千个试样的生产实践与其它方法对照,结果吻合。
The use of vanadium (Ⅳ) as catalyst in the determination of sulfuric acid - sodium chloride in the ore has been widely used. On this basis, we compared several halides and found that adding sodium bromide has the highest sensitivity for the determination of tin. A method for the determination of tin in ore by catalytic polarography with sulfuric acid - vanadium (Ⅳ) - sodium bromide was developed. Determination of lead interference tin, in the sulfuric acid medium plus barium chloride as a carrier to generate lead sulfate precipitation elimination, under the conditions of this method, the tin in the 0-50 micrograms / 20 ml, wave height and concentration of a linear relationship. The law after several mining nearly a thousand samples of production practices and other methods of control, the results match.