电感耦合等离子体质谱法快速测定工业盐中痕量碘

Rapid determination of iodine in salt industry by inductively coupled plasma-mass spectrometry

为了建立准确、快速测定工业盐中碘含量的方法,采用电感耦合等离子体质谱法（ICP-MS）测定工业盐中碘,以115 In为内标,优化各项参数.方法检出限为0.023 μg/g,线性范围碘质量分数为0～600μg/g时,线性相关系数r=0.999 9,相对标准偏差（RSD％）为1.3％,不同浓度的样品加标回收率在97.0％～101.4％之间.所建测定方法灵敏度高,线性范围宽,准确、可靠,操作简便、快速,适用于工业盐中碘元素测定.

To establish an ICP-MS method to determine iodine in salt industry,115In is used as on-line internal standards and the instrument＇s parameters are adjusted to good state.The limits of detection for iodine is 0.023 μg/g,and the method has a broad line-arrange 0-600 μg/g.The linear correlative coefficients for iodine is 0.999 9.The RSD of iodine in salt industry is 1.3％.The recoveries of different concentration-spiked samples are between 97.0％-101.4％.It indicates that this method has high sensitivity,broad line-arrange,good accuracy and precision.It is promising to determine iodine in salt industry.