摘要
研究了硝酸介质中痕量硒（Ⅳ）催化溴酸钾氧化中性红的褪色反应及其动力学条件，建立了一种新的测定痕量硒的动力学光度法．在适宜条件下，测硒（Ⅳ）的线性范围为０～１２μｇ／Ｌ，方法的灵敏度为２．５×１０－７ｇ／Ｌ．茶叶样品消化液经溶剂萃取，消除了Ｆｅ（Ⅲ）等干扰离子的影响，测定回收率为９２％～１０４％，相对标准偏差小于８％．
A new catalytic kinetic spectrophotometric method for the determination of trace selenium (Ⅳ) is developed based on the catalysis of trace selenium(Ⅳ) to the discoloring oxidization of neutral red (HnR) by potassium bromate in dilute nitric acid. At the optimum condition, a linear range of 0～12μg/L of Se(Ⅳ) is achieved with a sensitive of 2.5×10 -7 g/L. Combined with separation of selenium by solvent extraction, the method has been used for the determination of trace selenium in practical tea samples. The recoveries are 92%～104% and the relative standard deviations are less than 8%.
出处
《烟台大学学报（自然科学与工程版）》
CAS
1999年第2期95-99,共5页
Journal of Yantai University(Natural Science and Engineering Edition)
关键词
光度法
催化光度法
萃取分离
茶叶
硒
测定
catalytical kinetic spectrophotometry, trace selenium, extraction, tea
