电感耦合等离子体质谱法测定预混矿物质中的碘

Determination of iodine in premixed minerals by inductively coupled plasma mass spectrometry

中文关键词:  电感耦合等离子体质谱仪  碘  预混料矿物质

英文关键词:inductively coupled plasma mass spectrometry  iodine  premix mineral

中文摘要:

      目的 建立电感耦合等离子体质谱法(inductively coupled plasma mass spectrometry, ICP-MS)测定预混料矿物质中碘元素。方法 样品经5%氨水超声提取, 通过电感耦合等离子体质谱仪, 以103Rh作为在线内标, 对样品溶液进行测定。结果 在碘浓度为0~200 μg/L的范围内, 线性关系良好, 线性方程为Y=8.173×10?4X+1.991×10?4, 相关系数r为0.9993。对预混料样品加入低、中、高3个梯度进行加标测定, 回收率在88.6%~101.0%之间, 相对标准偏差小于2.3%(n=3)。结论 该方法准确、便捷、回收率良好, 适用于不同预混料矿物质中碘含量的测定。

英文摘要:

      Objective To establish a method for the determination of iodine in premix minerals by inductively coupled plasma mass spectrometry (ICP-MS). Methods The sample was extracted by ultrasonic with 5% ammonia-water and measured by inductively coupled plasma mass spectrometer with 103Rh as the online internal standard. Results In the range of iodine concentration of 0-200 μg/L, the linear relationship was good, the linear equation was Y=8.173×10?4X +1.991×10?4, and the correlation coefficient was 0.9993. Three gradients of low, medium and high were added to the premixed sample for standard test. The recovery was between 88.6% and 101.0%, and the relative standard deviation was less than 2.3% (n=3). Conclusion The method is accurate, convenient and has a good recovery rate, which is suitable for the determination of iodine content in different premix minerals.