微波消解-电感耦合等离子体质谱(ICP-MS)法测定稻谷中铬、镍、铜、砷、镉、铅的含量

Determination of Chromium,Nickel,Copper,Arsenic,Cadmium and Lead in Rice by ICP-MS with Microwave Digestion

通过对测定元素质量数和内标元素的选择,并对存在的干扰进行校正,采用电感耦合等离子体质谱(ICP-MS)法测定大米中铬、镍、铜、砷、镉、铅的含量。各元素测定值的相对标准偏差RSD(n=6)在0.61%～2.2%,加标回收率在92.8%～108%。用来测定标准物质GBW 10011、GBW10022、GBW(E)100348、GBW(E)100361,各元素的测定值与标准值一致,能够满足大米中重金属元素的测定要求。

The content of chromium, nickel, copper, arsenic, cadmium and lead in rice was determined by inductively coupled plasma mass spectrometry (ICP-MS) by selecting the mass and internal standard elements of the measured elements and correcting the existing interference. The relative standard deviation RSD ( n =6) of each element was between 0.61% and 2.2%, and the recovery was between 92.8% and 108%. Standard reference materials of GBW 10011, GBW 10022, GBW (E) 100348 and GBW (E) 100361 were analyzed by the above methods. The measured values of each element were in accordance with the standard values. The proposed method can meet the determination requirements of the heavy metal elements in rice.