微波消解-ICP-MS同时测定海洋沉积物中50种元素

Simultaneous determination of 50 elements in marine sediments by microwave digestion ICP-MS

海洋沉积物样品经微波消解处理后,使用电感耦合等离子体质谱(ICP-MS)测定其中50种元素,以空白溶液和海洋沉积物标准物质做两点标准曲线,优化了微波消解条件,确定了待测元素分析同位素及内标元素、仪器测定模式。结果表明,绝大部分待测元素检出限在0.1μg/g以下,各待测元素相对标准偏差为1.2%~12.4%。通过分析海洋沉积物国家标准物质,测定值和认定值吻合,实际样品各元素加标回收率为81.0%~118.1%。本方法能同时分析海洋沉积物中50种元素,具有极低的检出限,前处理方便、高效,且分解效果好,非常适合小批量海洋沉积物样品的快速分析。

The marine sediment samples were decomposed by microwave digestion and 50 elements in it were determined by ICP-MS. The two-point standard curves were plotted by blank solution and marine sediment reference materials. The microwave digestion conditions were optimized, and the analytical isotopes, internal standard elements and instrument determination modes were determined. The results showed that the detection limit of most of the elements was below 0.1 μg/g, and the RSD of each elements were between 1.2% and 12.4%.The measured value was consistent with the certified value through the analysis of national standard references of marine sediments, and the recovery of each elements in the actual sample was between 81.0% and 118.1%.50 kinds of elements in marine sediments could be measured at the same time with very low detection limit in this method, and it was very suitable for rapid analysis of small batch of marine sediment samples because of convenience, high efficiency, and good decomposition effect.