碘盐中微量碘的直接电位分析  

Direct Potentiometric Analysis of Trace Iodide in Iodated Salt

作　　者：毛蓓蓓[1] 李吉学[1] 范金生 叶青[1] 骆望美[1] 

机构地区：[1]海军医学高等专科学校分析化学教研室,南京210099

出　　处：《海军医高专学报》1997年第1期13-15,共3页

摘　　要：采用改进的离子选择性电极技术直接测定了碘盐中的微量碘。在0.50mol／LNaCl0．01mol／LVc介质中，由KI或KIO3碘化的食盐含碘量可以采用标准曲线法直接分析，不需要氯碘分离，Cl-的干扰作用被校正。碘盐分析的相对标准偏差和回收率分别是1.8％（n＝6）和105.9％，模拟碘盐分析的平均相对误差值为5.2％。Trace iodide in the iodated salt was directly measured with an improved ion-selec tive electrode technique. The content of iodide in the salt iodated with KI or KIO3 was directly analysed in the mixture composed of 0. 50 mol/L NaCl-0. 01 mol/L Vc with the standard curve method, in which the chloride and iodide in the iodated salt were not separated from each other and the interference of Cl- was calibrated. The relative standard deviation and the recovery in analysing iodated salt were 1. 8 % (n = 6 ) and 105. 9%, respectively, and the mean relative error of analysing the simulated iodated salt was 5. 2%.

关 键 词：碘 碘盐 离子选择性电极 标准曲线法 电位分析 

分 类 号：O657.15[理学—分析化学] TS365[理学—化学]