β-环糊精增敏动力学光度法测定痕量硒  

Kinetic Spectrophotometric Determination of Trace Selenium with Β-Cd as Sensitizer

作　　者：赵桦萍[1] 靳凤丹[2] 肖忠峰[3] 

机构地区：[1]齐齐哈尔大学化学与化工学院,黑龙江齐齐哈尔161006 [2]燕山大学环境与化学工程学院,河北秦皇岛066004 [3]滨州学院化学与化工系,山东滨州256603

出　　处：《食品研究与开发》2013年第1期94-96,共3页Food Research and Development

摘　　要：基于在硝酸介质中,β-环糊精对硒催化溴酸钾氧化罗丹明B的褪色反应具有增敏作用,建立了测定硒的催化动力学光度法,灵敏度较不加~环糊精的方法提高了2.5倍。测定硒的线性范围：0~40μg/L,检出限为0.381μg/L,加标回收率为98.87%,6次测定的RSD小于5%。用于富硒大米中硒的测定,结果令人满意。A catalytic kinetic photometric method for determination of trace selenium （ 1 V） with I3-CD as sensiti -zer has been developed.The method is based on the fact that the color fading reaction of rhodamine B oxidized by potassium bromate in dilute HNO3 solution is catalyzed by selenium （1V）. The addition of β-CD increases the sensitivity of selenium by a factor of 2.5.The linear range for determination of selenium is 0-40 μg/L with detec- tion limit of 0.381 μg/L.The recovery of standard addition is 98.87 % with precision of〈5% RSD （n=6）. The method has been applied to the determination of trace selenium （IV） in selenium rice with satisfactory re- suits.

关 键 词：动力学光度法 Β-环糊精 硒 

分 类 号：TS207.3[轻工技术与工程—食品科学] O657.3[轻工技术与工程—食品科学与工程]