journal6 ›› 2011, Vol. 32 ›› Issue (2): 89-91.

• 化学化工 • 上一篇    下一篇

硒锑钼-丁基罗丹明B体系光度法测定硒

  

  1. (吉首大学化学化工学院,湖南 吉首 416000)
  • 出版日期:2011-03-25 发布日期:2012-04-09
  • 作者简介:黄诚(1963-),男,湖南洞口人,吉首大学化学化工学院教授,硕士,主要从事食品技术研究与开发研究.
  • 基金资助:

    科技部科技人员服务企业行动项目(国科发计[2009]598号)

Determination of Trace Selenium by Spectrophotometry Based on Se-Sb-Mo Rhodamine B System

  1. (Food Science Institute of Jishou University,Jishou 416000,Hunan China)
  • Online:2011-03-25 Published:2012-04-09

摘要:研究了硒锑钼杂多酸与丁基罗丹明B的显色反应.在盐酸介质中, 硒锑钼形成的杂多酸被抗坏血酸还原形成杂多蓝,再与丁基罗丹明B形成缔合物沉淀.经甲苯悬浮分离,缔合物由乙醇溶解,直接在有机相中测定其吸光度,最大吸收波长在556 nm处,其表观摩尔吸光系数ε=1.341×105L·mol-1·cm-1, 硒浓度在0~0.8 μg/mL范围内服从比尔定律.本法用于果蔬中痕量硒的测定,结果满意.

关键词: 硒, 丁基罗丹明B, 光度法

Abstract: Color reaction of Se-Sb-Mo heteropoly acid with butyl rhodamine B was investigated.Heteropoly blue was produced by treatment of Se-Sb-Mo heteropoly acid with ascorbic acid,which was precipitated after addition of butylrhodamine B.The resulting precipitation was isolated into toluene by suspension and was measured by spectrophotometry after dissolved in ethanol.The results indicate that,at the maximum absorption wavelength 556 n m,the molar absorptivity is 1.341×105 L·mol-1·cm-1 and obeys Lamber-Beer Law at the selenium concentration 0~0.8  μg/mL.This method is suitable for determination of trace selenium in vegetables and fruits.

Key words: selenium, butyl rhodamine B, spectrophotometry

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