北部湾海产品样品在硝酸-过氧化氢(4+3)混合液中经微波消解处理,采用电感耦合等离子体质谱法测定样品溶液中7种重金属(铬、铜、砷、镉、锑、汞、铅)的含量。采用内标法消除基体的影响。方法的检出限(3s)在0.018~0.23 μg·L-1之间。按方法分析海虾样品做精密度试验,上述7元素测定值的相对标准偏差(n=6)在1.4%~8.8%之间。方法用于黄鱼(GBW 08573)和扇贝(GBW 10024)两个国家标准物质中重金属含量的测定,测定值与认定值相符。

The sample of seafood from Beibu gulf was digested with a mixture of HNO3 and H2O2 (4+3) by microwave assisted digestion, and contents of 7 heavy metals (i.e. Cr, Cu, As, Cd, Sb, Hg and Pb) in the sample solution were determined by ICP-MS. The matrix interference was eliminated by internal standard method. Detection limits (3s) of the method found were in the range of 0.018-0.23 μg·L-1. Tests for precision were made by analyzing a sea shrimp sample by the proposed method, giving values of RSD′s (n=6) for the 7 elements in the range of 1.4%-8.8%. In analysis of two CRMs of yellow croaker (GBW 08573) and scallops (GBW 10024) by this method, the results obtained were in consistency with the certified values.