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为寻找极谱测定锡的灵敏方法,我们曾提出一种极谱催化波,本文研究了此催化波的机理,并将方法用于纯金属铁、镍中微量锡的测定。在Lingane所用的相似底液中,根据Drye等关于钒(Ⅳ)与锡(Ⅱ)化学动力学的研究,我们加入一定量的钒(Ⅴ)或钒(Ⅳ)都能在锡(Ⅳ)的第二还原波上得到催化波。此波呈对称峰形,稳定,重现性好,峰电流与锡(Ⅳ)浓度在M间有直线关系。实验结果及讨论 (一)催化波的形成条件前文报导了Sn(Ⅳ)催化波的形成条件,现提高Ⅴ(Ⅳ)浓度,降低酸度,用残余电流补偿,测左峰高度,则可测更低
In order to find a sensitive method for the determination of tin by polarography, we have proposed a polarographic catalytic wave. In this paper, the mechanism of this catalytic wave has been studied. The method has been applied to the determination of trace tin in pure metallic iron and nickel. According to Drye et al.’s study on the chemical kinetics of vanadium (IV) and tin (II), we can add a certain amount of vanadium (V) or vanadium (IV) The second reduction wave obtained catalytic wave. The wave was symmetrical peak, stable, good reproducibility, peak current and tin (Ⅳ) concentration in a linear relationship between the M. EXPERIMENTAL RESULTS AND DISCUSSION (I) Formation of Catalytic Waves The conditions for the formation of catalytic waves of Sn (IV) have been previously reported. Increasing the concentration of V (IV), decreasing the acidity, compensating for the residual current and measuring the height of the left peak, low