应用等色染料离子对的褪色反应测定中草药中硒(Ⅳ)的含量
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[摘要] 目的：建立测定中草药中硒的一种新的催化动力学光度法。方法：在酸性介质中,硒(Ⅳ)能催化H2O2氧化溴酚蓝-丁基罗丹明B的褪色反应，硒(Ⅳ)含量在0~5 μg/L范围内与褪色反应速率成正比。结果：样品经HNO3-HClO4消化后直接测定硒(Ⅳ)的含量，该方法具有良好的选择性和准确度。结论：该法可用于中药材中硒的测定，结果令人满意。
[关键词] 等色染料离子对；催化；硒
[中图分类号]R932 [文献标识码]A [文章编号]1673-7210(2008)02(a)-031-02
Determination of amounts of selenium(Ⅳ) in Chinese herbal drugs using the decolorant reaction of isochromatic dye ion-pair
YU Zhao-yun, DING Liang
(Hebei University Health Science Center, Baoding 071000, China )
[Abstract] Objective: To describe a new spectrophotometric method for the determination of selenium(Ⅳ) in Chinese herbal drugs. Methods: The selenium(Ⅳ) catalyzed oxidation ofbromophenol blue-butylrhodamine B with H2O2 in nitric acid medium. And as the redox reaction proceeds, the purple color was decolorized. The decolorant reaction showed a good linear relationship with the amounts of selenium(Ⅳ) ......
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