离子选择性电极测定食品中的硒  

Determination of Selenium in Foods by Using Ion Selective Electrode

作　　者：王未肖[1] 李景印[1] 段惠敏[1] 李淑芳[1] 

机构地区：[1]河北科技大学理学院,石家庄050018

出　　处：《分析试验室》2005年第2期55-58,共4页Chinese Journal of Analysis Laboratory

基　　金：国家高科技研究发展计划青年基金资助项目(2002AA639570)

摘　　要：以硒的难溶化合物为电活性物质,自行研制了一种测定硒的离子选择性电极。研究表明,该电极对Se2-的线性响应范围为6×10-7～10-4mol/L,工作曲线的斜率为27.3mV(19℃),检出限为3.5×10-7mol/L,电极的选择性比较高,常见离子对测定无明显干扰,可用于食品中硒的测定。A new selenite ion selective electrode, that is a high Se ion selectivity, has been developed by using Ag_2Se as electroactive material and pressing it to be active membrane. The electrode exhibits good potentiometric response for Se(Ⅱ) over a wide concentration range (6×10^(-7)～10^(-4) mol/L) with Nernstian slope of 27.3 mV per decade at the temperature of 19 ℃. The detection limit is 3.5×10^(-7) mol/L. It has been used for three kinds of foods and exhibited good selectivity to Se in comparison with alkali, alkaline earth, transition and heavy metal ions. It can be used to determine the total selenium in foods.

关 键 词：痕量硒 离子选择性电极 氢化物发生法 食品 

分 类 号：O657.11[理学—分析化学]