食品科学

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表面活性剂增敏光度法测定食盐中的碘

刘冬莲1,沈天骄2,刘立华1,刘会媛1,*   

  1. 1.唐山师范学院化学系,河北 唐山 063000;2.哈尔滨医科大学公共卫生学院,黑龙江 哈尔滨 150081
  • 出版日期:2014-06-25 发布日期:2014-07-03
  • 通讯作者: 刘会媛
  • 基金资助:

    唐山师范学院项目(10B04)

Determination of Iodine in Table Salt by Surfactant Sensitization Spectrophotometric Method

LIU Dong-lian1, SHEN Tian-jiao2, LIU Li-hua1, LIU Hui-yuan1,*   

  1. 1. Department of Chemistry, Tangshan Normal College, Tangshan 063000, China;
    2. School of Public Health, Harbin Medical University, Harbin 150081, China
  • Online:2014-06-25 Published:2014-07-03
  • Contact: LIU Hui-yuan

摘要:

建立了碘酸根-荧光黄-表面活性剂体系下测定食盐中碘的方法。采用增敏光度法研究在醋酸介质中,表面活性剂存在下,溴化钾催化KIO3氧化荧光黄的褪色反应。结果表明:最大吸收波长为438.5 nm,KIO3质量浓度在0.40~3.00 μg/mL范围内遵守朗伯-比尔定律,ΔA与KIO3质量浓度之间呈线性关系;438.5 nm波长条件下该反应的相关系数为0.999 0,表观摩尔吸光系数为4.31×104 L/(mol·cm)。用于测定食盐中微量的碘,相对标准偏差为0.83%~1.47%,回收率为98.1%~98.4%,此方法准确度较高,操作简便、快捷,是测定加碘食盐中碘含量较好的方法之一。

关键词: 荧光黄, 褪色分光光度法, 表面活性剂, 碘, 食盐

Abstract:

This paper describes a method for the determination of iodine in table salt using iodate-fluorescent yellowsurfactant
system. The conditions for the oxidation of fluorescent yellow by potassium iodate in acetic medium were studied.
The system had a maximum absorption at 438.5 nm in the medium of acetic acid. Beer’s law was obeyed in the range of
0.40–3.00 mg/L of iodine. The molar absorption coefficient was 4.31×104 L/(mol·cm) with a correlation coefficient of
0.999 0. The precision expressed as relative standard deviation (RSD) was in the range of 0.83%–1.47%, and the recoveries
were in the range of 98.1%–98.4%. This method is simple, rapid, accurate and precise, and has been successfully used in
determination of iodine in table salt.

Key words: fluorescent yellow, fade spectrophotometric method, surfactant, iodine, table salt

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