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我们找到锡(Ⅳ)与钒(Ⅳ)所产生的催化波,灵敏度可达1·10~(-7)M,能用来测定高纯金属中微量的锡。实验用LP-55型极谱仪,检流计灵敏度3.4××10~(-9)安/毫米。滴汞电极和饱和甘汞电极。钒(Ⅳ)溶液由SO_2还原1N HCl的NH_4VO_3溶液制得。锡(Ⅳ)在1N HCl-4 M NH_4Cl中有两个极谱波,第二波(-0.52伏,对S.C.E.)可用作定量分析,但要测定痕量的锡,灵敏度不够高。Drye等作了钒(Ⅴ)与锡(Ⅱ)反应的动力学研究。我们在上述底液中有微量锡(Ⅳ)存在时,加入少量钒(Ⅴ)
We find the catalytic wave generated by tin (Ⅳ) and vanadium (Ⅳ) with a sensitivity of 1-10 · M, which can be used to determine trace amounts of tin in high purity metals. Experimental LP-55-type polarography, galvanometer sensitivity 3.4 × 10 ~ -9 (A) / mm. Dropping mercury electrode and saturated calomel electrode. Vanadium (Ⅳ) solution from the SO 2 reduction 1N HCl NH_4VO_3 solution prepared. Tin (IV) has two polarographic waves in 1N HCl-4 M NH 4 Cl and the second wave (-0.52 V, for S.C.E.) can be used for quantitative analysis. However, for the determination of traces of tin, the sensitivity is not high enough. Drye et al. Studied the kinetics of the reaction of vanadium (Ⅴ) with tin (Ⅱ). We have in the bottom of a small amount of tin (IV) in the presence of a small amount of added vanadium (V)