Novel Method for Indirect Determination of Iodine in Marine Products by Atomic Fluorescence Spectrometry

• Published in: Chemical research in Chinese universities 2013-02, Vol.29 (1), p.26-29
• Main Authors: Lu, Jian-ping, Tan, Fang-wei, Tang, Qiong, Jiang, Tian-cheng
• Format: Article
• Language: English
• Subjects: Analytical Chemistry; Chemistry; Chemistry and Materials Science; Chemistry/Food Science; Inorganic Chemistry; Organic Chemistry; Physical Chemistry; 原子荧光光谱法; 最佳实验条件; 海产品; 甲基异丁基酮; 相对标准偏差; 硼氢化钾; 碘含量; 间接测定
• ISSN: 1005-9040; 2210-3171
• DOI: 10.1007/s40242-013-2171-2

A method for the determination of iodine based upon compound H2HgI4, formed between I- and Hg1＋ in nitric acid and extracted in methyl isobutyl ketone（MIBK）, was developed via atomic fluorescence spectrometry（AFS）. After the compound is reduced with potassium borohydrid（KBH4）, the resultant mercury vapor was injected into the instrument and iodine was, therefore, indirectly determined. Experimental parameters such as the conditions of extraction reagents, aqueous phase acidity, elemental mercury diffusion temperature in a vial and other factors were investigated and optimized. Under the optimum experimental conditions, this method shows a detection limit of 0.038μg/L iodine and a linear relationship between 0.04-20 p.g/L. The method was applied to determining the iodine content in marine duck eggs, kelps, laver and Ganoderma lucidum spirulina, showing a relative standard deviation（RSD） of 2.15% and the recoveries in the range of 98.1%-102.5%.