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在矿物岩石(主要是磷矿)和水质分析中,测定碘的方法常采用“溴水氧化溶量法”、“碘一淀粉比色法”及“催化法”等。这些方法,针对不同对象,都可以得到满意的结果。但容量法及比色法都用溴水氧化,因而手续繁琐,灵敏度不高。催化法虽然灵敏度高,但萃取分离、催化等条件不易掌握,而且适用的碘含量范围较窄。目前,将具有高选择性和高灵敏度的碘电极用于磷矿和水质分析,可不经任何分离和氧化步骤而直接测定碘以及间接测定其它元素,都获得了较好的结果。
In the mineral rock (mainly phosphate) and water quality analysis, iodine determination methods often use “bromine water oxidation method”, “iodine a starch colorimetric method” and “catalytic method” and so on. These methods, for different objects, can be satisfied with the results. However, both volumetric method and colorimetric method are brominated water oxidation, which cumbersome procedures, the sensitivity is not high. Although the catalytic method of high sensitivity, but the extraction separation, catalysis and other conditions is not easy to grasp, but also for a narrow range of iodine content. At present, iodine electrodes with high selectivity and high sensitivity are used for phosphate rock and water quality analysis, iodine can be measured directly without any separation and oxidation steps, and indirect determination of other elements gives better results.