磷钼杂多酸修饰电极催化还原测定IO_3^-与BrO_3^-的液相色谱电化学研究  

Determination of Iodate and Bromate by Catalytic Reduction at 1 : 12 Molybdophosphate Chemically Modified Electrode in Liquid Chromatography

作　　者：金利通[1] 刘彤[1] 孙星炎[1] 方禹之[1] 

机构地区：[1]华东师范大学化学系,上海200062

出　　处：《分析化学》1993年第10期1117-1121,共5页Chinese Journal of Analytical Chemistry

摘　　要：本文介绍了1:12磷钼杂多酸(PMo_(12))修饰电极的制备及其对IO_3^-、BrO_3^-的催化还原作用。本文还研究了在涂敷十六烷基三甲基溴化铵的C_(18)键合固定相上IO_3^-与BrO_3^-的分离方法,并采用修饰电极色谱电化学的方法对IO_3^-与BrO_3^-进行定量测定。IO_3^-、BrO_3^-的量分别在8.0×10(-10)～1.0×10^(-7)mol和1.6×10^(-9)～3.0×10^(-7)mol范围内与峰高呈良好的线性关系,检测限分别为4.0×10^(-10)mol与1.0×10^(-9)mol。用本方法测定IO_3^-和BrO_3^-重现性好、线性范围大,是测定IO_3^-与BrO_3^-的一种实用方法。A glassy carbon electrode modified with a monoiayer of 1 : 12 molybdophosphate (PMo12)was prepared. This modified electrode behaves as high electrocatalytic effect on the reduction of iodate and bro-mate. Cetyltrimethylamonium bromate(CTMAB) was coated onto 5μm bonded-C18 phase so as to separate iodate and bromate. Liquid chromatography electrochemistry with PMo12 chemically modified electrode was used to determine these two anions. The linear range of detection is 8. 0×10-10-1.0×10-7 mol/L for iodate and 1. 6X 10-9-3.0×10-7 mol/L for bromate,respectively. The detection limit is 4. 0×10-10 mol/L for iodate and 1. 0×10-9 mol/L for bromate,respectively. The main advantage of this method is getting good re-producibility with large dynamic range. Real samples were determined and the results are satisfactory.

关 键 词：修饰电极 碘酸根 溴酸根 

分 类 号：O613.44[理学—无机化学]