摘要
报道了荧光素为指示剂荧光猝灭法间接测定ＩＯ３－的方法。在０．０５ｍｏｌ／ＬＨ２ＳＯ４介质中，Ｉ－和ＩＯ３－反应生成Ｉ２，I２与荧光素反应、使荧光素荧光猝灭。该体系的激发波长和发射波长分别为４９３ ｎｍ和５１４ ｎｍ。ＩＯ３含量在２～８０ μｇ／Ｌ范围内有良好的线性关系，测定下限为 ２ μｇ／Ｌ。该法灵敏度高，选择性好，操作简单。用于含碘食盐、低钠食盐中微量ＩＯ３的测定，结果满意。
A highly sensitive. and selective fluorescence quenching method was developed to determine the iodate ion(IO3- )with fluorescein as the fluorescent reagent (ex= 493 nm,em= 5l4 nm). IO3- reacts with potassium iodide in sulfuric acid solution (0. 05 mol/L) giving iodine (I2) which then reacts with fluorescein to produce a non-fluorescent compound, thus quenching the fluorescence intensity of the system. The linear calibration range is 2～80 μg/L. The determination limit is 2 μg/L. The method was successfully applied to the deter- mination of iodate ion in table salt and low sodium salt.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
1997年第8期906-908,共3页
Chinese Journal of Analytical Chemistry
关键词
碘酸根
荧光素
荧光猝灭法
食盐
Iodate ion, fluorescein, fluorescence quenehing method
