超声水提法-ICP-MS检测配方乳粉中碘的含量

Determination of iodine in powdered formulas by inductively coupled plasma-mass spectrometry-the extraction with water by ultrasonic

中文关键词:  配方乳粉  碘元素  电感耦合等离子体质谱法

英文关键词:powdered formulas  iodine  inductively coupled plasma-mass spectrometry

中文摘要:

      目的 建立超声水提法-电感耦合等离子体质谱法(inductively coupled plasma-mass spectrometry, ICP-MS)测定配方乳粉中碘元素的含量。方法 采用水直接溶解配方乳粉中碘元素并用沉淀剂沉淀蛋白, 离心后取上清液用电感耦合等离子体质谱仪(ICP-MS)检测。结果 本方法测定配方乳粉中碘元素含量, 线性相关系数良好(R>0.999), 检出限为0.43 ng/mL, 精密度低于3%, 碘元素加标回收率在74.5%~120.5%之间。结论 此方法能够准确、快速、简便地检测配方乳粉中碘元素的含量。方法重复性较好、没有复杂的前处理步骤、检测速度快、适用于大批量配方乳粉中碘元素含量的测定。

英文摘要:

      Objective To establish a method for determination of iodine in powdered formulas by inductively coupled plasma-mass spectrometry-the extraction with water by ultrasonic. Methods First, iodine in powdered formulas was dissolved by water, and protein was subsided with precipitant. Then, supernatant was extracted with centrifuge machine, and determined by inductively coupled plasma-mass spectrometry. Results The linear correlation coefficients of the method for determination of iodine were more than 0.999. The detection limits was 0.43 ng/mL, and the relative standard deviations were not more than 3%.The recoveries for the spiked samples ranged from 74.5% to 120.5%. Conclusion The result showed that this method was accurate, rapid and simple. It has many advantages, such as without complex pretreatment steps, with fast testing velocity and it can be applied to the iodine determination of large quantities of powdered formulas.