食品科学 ›› 2009, Vol. 30 ›› Issue (2 ): 174-175.doi: 10.7506/spkx1002-6630-200902037

• 分析检测 • 上一篇    下一篇

靛蓝胭脂红褪色光度法测定食盐中碘的研究

刘立华,刘冬莲,刘会媛   

  1. 唐山师范学院化学系
  • 收稿日期:2007-12-28 修回日期:2008-03-22 出版日期:2009-01-15 发布日期:2010-12-29
  • 通讯作者: 刘会媛 E-mail:zhangwenzhao123@126.com

Spectrophotometric Determination of Iodine in Table Salt Based on Discoloration of Indigo Carmine with Potassium Bromide

LIU Li-hua,LIU Dong-lian,LIU Hui-yuan   

  1. (Chemical Department, Tangshan Teachers College, Tangshan 063000, China)
  • Received:2007-12-28 Revised:2008-03-22 Online:2009-01-15 Published:2010-12-29
  • Contact: LIU Hui-yuan E-mail:zhangwenzhao123@126.com

摘要:

在酸性介质中,溴化钾存在下,碘酸根对靛蓝胭脂红有褪色作用,且褪色程度与碘酸根的量有关,从而建立了碘的光度测定新方法。方法的最大吸收波长在610nm 处,碘定量测定的线性范围为0~18μg/10ml。方法操作简单,快速、重现性好,用于加碘食盐中碘的测定,结果满意。

关键词: 靛蓝胭脂红, 褪色光度法,

Abstract:

It is found that in the medium of H2SO4, the discoloration of indigo carmine is quickened by IO3 with the presence of KBr. The discoloration of indigo carmine is found to be directly proportional of the amount of iodine in table salt. Based on these facts, a new spectrophotometric method for the determination of iodine in table salt was proposed. The decrease of absorbance (ΔA) was measured at the wavelength of 430 nm which is the absorption maximum of indigo carmine. The linear range is 0 to 18 μg/10 ml for iodine determination.

Key words: indigo carmine, discoloration, iodine

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