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卤水中碘含量很低,有大量的氯、溴离子共存。在有大量氯、溴离子存在下碘的分析方法文献中报导不少。Lassaigne J.L.,Strebinger R.,Dollak I.等根据 pd(Ⅱ)在1%的盐酸溶液中与碘离子生成碘化钯沉淀用重量法来测定碘的含量。该方法精度高,但整个分析操作历时二天之久,而且有机物和乙醇严重干扰测定;用HNO_2氧化碘离子为碘,用二硫化碳或氯仿萃取,直接用硫代硫酸钠标准溶液滴定有机相
Brine iodine content is very low, a large number of chlorine, bromide coexist. In the presence of a large number of chlorine, bromine ions in the presence of iodine analysis methods reported in the literature a lot. Lassaigne J.L., Strebinger R., Dollak I. et al. Determine iodine content gravimetrically based on the precipitation of palladium iodide from iodide ions in a 1% hydrochloric acid solution according to pd (II). The method has high precision, but the whole analysis operation lasts for two days, and the determination of organic matter and ethanol seriously interfere; the iodine ion is oxidized with HNO 2 as iodine, extracted with carbon disulfide or chloroform, and the organic phase is directly titrated with sodium thiosulfate standard solution