在硝酸浓度为0.1　mol·L-1介质中, I－和Hg2+ 能生成稳定的化合物, 被甲基异丁酮萃取, 原子荧光光谱法测定有机相中的汞, 间接得到碘的含量。 工作考察了萃取条件以及其他影响因素。 在优化的实验条件下, 碘的含量在0～12 μg·L-1范围内呈良好的线性关系, 方法的检出限是0.14 μg·L-1, 相对标准偏差3.3%, 对蛋类样品加标回收率为101.8%～110.4%。

In this paper, a new method was developed for indirect determination of iodine with methyl isobutyl ketone (MIBK) extraction by atomic fluorescence spectrometer (AFS). Based upon the complex, which can be extacted perfectly by MIBK, formed between I- and Hg2+ in 0.1 mol·L-1 of nitric acid, indirectly measuring the iodine in organic phase becomes possible. The effects of extraction conditions and other influence factors were investigated. Under the optimized experimental conditions, the results showed that the linearity between its absorbance and the concentration of iodine was 0～12 μg·L-1, the detection limit is 0.14 μg·L-1, and the relative standard deviation is 3.3%. The method has been applied to the determination of iodine in eggs, and the recoveries are in the range of 101.8%～110.4%.