催化分光光度法测定水中微量碘的方法优化  

Optimization of Catalytic Spectrophotometry for the Determination of Trace Iodine in Water

作　　者：贾亮亮 尹红云 JIA Liang-liang;YIN Hong-yun(The Institute of Hydrology and Engineering Geological Prospecting Hebei Province,Shijiazhuang 050021,China)

机构地区：[1]河北省水文工程地质勘查院,河北石家庄050021

出　　处：《化学试剂》2020年第11期1341-1344,共4页Chemical Reagents

基　　金：河北水勘院科技立项科研项目(201402)。

摘　　要：旨在优化以催化分光光度法定量分析水体中微量碘的分析体系。在醋酸盐缓冲溶液体系中,碘催化4,4′-四甲基二氨基-二苯基甲烷与氯胺T发生氧化反应,生成蓝色配合物,通过测试该配合物的吸光度可定量分析水体中的碘。优化了分析体系中的测定波长、缓冲溶液的用量、显色剂的用量、氯胺T的浓度等实验条件。在优化的实验条件下,分光光度法的微量碘测定结果的相对标准偏差为2.1%,检出限为0.1μg/L。方法选择性好、操作简便、成本低、灵敏度高,满足水文地质工作对水中微量碘含量普查的要求。To optimize the analytical system for the quantitative analysis of trace iodine in water by catalytic spectrophotometry,in the acetate buffer solution system,4,4′-tetramethyldiamino diphenylmethane and chloramine T reacted to form blue complex,and iodine in water can be quantitatively analyzed by measuring the absorbance of the complex.The experimental conditions were optimized,such as the measured wavelength,the amount of buffer solution,the amount of developer and the concentration of chloramines T.Under the best experimental conditions,the trace iodine in water was determined by spectrophotometry.The relative standard deviation was 2.1%,and the detection limit was 0.1μg/L.The results showed that the method had the advantages of good selectivity,simple operation,low cost and high sensitivity.It met the requirements of hydrogeological work for general survey of trace iodine content in water.

关 键 词：催化分光光度法 水 方法优化 微量碘 4 4′-四甲基二氨基-二苯基甲烷 氯胺T 

分 类 号：O657.32[理学—分析化学]