半消解–电感耦合等离子体质谱法同时测定油菜籽中多元素的含量

Simultaneous detection of multi-elements in rapeseed by semi-digestion-inductively coupled plasma mass spectrometry

采用半消解–电感耦合等离子体质谱法同时测定油菜籽中的钙、铁、铜、铅、锌、镉、锰、镁、总砷九种无机元素,对半消解的条件和电感耦合等离子体质谱法的条件进行了优化研究,对微波消解法与半消解样品前处理进行了比对,采用配对t检验进行验证。结果表明:与国标GB5009.268的微波消解法比较无显著性差异,该方法的相对标准偏差在2.5%~14.5%之间,九种元素的方法检出限在0.001~0.14 mg/kg之间。应用于油菜籽样品中九种金属元素的测定,结果令人满意。

In this paper, Semi-digestion-inductively coupled plasma mass spectrometry method was employed to detect concentration of Ca, Fe, Cu, Pb, Zn, Cd, Mn, Mg and As in rapeseed samples simultaneously. The condition of semi-digestion and inductively coupled plasma mass spectrometry was optimized. Sample pretreatment was compared between semi-digestion and microwave digestion by t-test verification. The results show no significant difference between our method and the microwave digestion method mentioned in GB 5009.268. The relative standard deviation of our method is between 2.5% and 14.5%. The detection limit of 9 elements is between 0.001~0.14 mg/kg. The method has been applied to the determination of nine metal elements in rapeseed samples with satisfactory results.