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本文在硫酸—碘化钾—抗坏血酸—钒酸盐—氯化钠体系中测定微量Sn,并且试验了测定微量Sn的主要干扰元素的影响及消除,样品在750℃焙烧1小时后除去As、S的干扰,经过氧化钠熔融后卽酸化,减少Ca、Mg的吸附,并且加入氯化钡、盐酸羟胺,消除Pb、Mn、Fe的影响。 在底液中加入氯化钠,使波形良好,起始电位不随浓度而变,使峰电流稳定,但灵敏度
In this paper, trace amount of Sn was measured in sulfuric acid-potassium iodide-ascorbate-vanadate-sodium chloride system and the influence and elimination of the main interference elements for determination of trace Sn were tested. The interference of As and S after the sample was roasted at 750 ℃ for 1 hour , After smelting sodium oxide 卽 acidification, reducing the adsorption of Ca, Mg, and adding barium chloride, hydroxylamine hydrochloride, eliminating the impact of Pb, Mn, Fe. Sodium chloride is added to the bottom liquid to make the waveform good, the initial potential does not change with the concentration, the peak current is stabilized, but the sensitivity