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采用下列两种指施之一可以扩大Sill利Peterson的半微量碘定量法测定铊的范围,适用于半微量及常量铊的测定,结果的准确度较原法有所提高。 (1)在被滴定溶液里加入阿拉伯胶和乙醇,在Tl~+和硫代硫酸钠溶液浓度为0.005—0.05N时,相应加入15—40毫升1％阿拉伯胶溶液和5—20毫升95％的乙醇。 (2)在被滴定溶液内加入溴化钾,在Tl~+和硫代硫酸钠溶液浓度为0.05—0.1N时,最宜条件是:酸度0.2—1.0N,H_2SO_4;溴化钾1.0—1.5M;碘化钾0.0036—0.0055M:滴定后体积约70毫升。
Sill Lee Peterson’s semi-micro-iodometric method can be used to determine the range of thallium by one of the following two methods. It is suitable for the determination of semi-micro and constant thallium, and the accuracy of the results is improved compared with the original method. (1) Add gum arabic and ethanol to titrated solution, add 15-40 ml of 1% gum arabic solution and 5-20 ml of 95% solution at the concentration of Tl ~ + and sodium thiosulfate solution of 0.005-0.05N, Of ethanol. (2) When potassium bromide is added into the titrated solution, the optimal conditions for the concentration of Tl ~ + and sodium thiosulfate solution are 0.05-0.1N are as follows: acidity 0.2-1.0N, H 2 SO 4; potassium bromide 1.0-1.5 M; Potassium iodide 0.0036-0.0055M: After titration the volume is about 70 ml.