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微量碘的测定一般采用淀粉比色法,或催化比色法。测定岩矿中微量碘要求预分离和富集。本文在文献的基础上,以717阴离子交换树脂分离富集,用0.5mol/L硝酸钠淋洗出溴后,接着用2mol/L硝酸钠全部淋洗出碘。洗出的碘在0.5ppm以上者可用淀粉比色法测定,在0.05ppm以上者可用催化比色法测定。 一、仪器及试剂 岛津UV-120-02分光光度计 碘标准溶液 溶解0.1308g在105℃烘二小时的KI于水中,用水冲至1升,保存在暗处。此溶液
Determination of trace amounts of iodine commonly used starch colorimetry, or catalytic colorimetry. Determination of trace amounts of iodine in rock ore pre-separation and enrichment. In this paper, based on the literature, with 717 anion exchange resin separation and enrichment, with 0.5mol / L sodium nitrate leaching bromine, followed by 2mol / L sodium nitrate all leaching of iodine. Washing iodine 0.5ppm or more available starch colorimetric determination of 0.05ppm or more by catalytic colorimetric determination. First, the apparatus and reagents Shimadzu UV-120-02 spectrophotometer iodine standard solution 0.1308g dissolved at 105 ℃ for two hours KI in the water, washed with water to 1 liter, stored in the dark. This solution