阻抑动力学分光光度及荧光光度法测定微量碘  

Kinetic Spectrophotometric and Fluorimetic Determination of Micro Amounts of Iodine Based on Its Inhibitory Effect in Nitrite-Potassium Bromate-Pyronine B System

作　　者：张爱梅[1] 王术皓[1] 崔慧[1] 

机构地区：[1]聊城师范学院化学系,聊城252059

出　　处：《分析化学》2001年第10期1160-1162,共3页Chinese Journal of Analytical Chemistry

摘　　要：在稀磷酸介质中，微量碘离子对亚硝酸根催化溴酸钾氧化吡罗红Ｂ褪色及荧光猝灭的反应有显著阻抑作用，以此为指示反应提出了测定微量碘离子的阻抑动力学光度和阻抑动力学荧光分析新方法。测定碘离子的线性范围分别为 ４～２００ μｇ／Ｌ和 ３～４０μｇ／Ｌ，检出限分别为 ２．８μｇ／Ｌ和１．６μｇ／Ｌ。用于食品中微量碘的测定，结果满意。A simple and sensitive kinetic spectrophotometric and a fluorimetric method for determination of micro amounts of iodine have been developed. The methods are based on the inhibitory action of iodine ion on the decoloration and fluorescence quenching oxidized by potassium bromate and catalyzed by nitrite in dilute phosphoric acid medium. The linear ranges of determination are 4 similar to 200 mug/L I- for spectrophotometric method and 3 similar to 40 mug/L I- for fluorimetric method, the detection limits are 2.8 mug/L and 1.6 mug/L respectively. The fluorimetric method has been used for the determination of micro amounts of iodine in food with satisfactory results.

关 键 词：碘 阻抑动力学分析 分光光度法 荧光光度法 食品 测定 阻抑反应 吡罗红B 微量分析 

分 类 号：O657.3[理学—分析化学]