生物样品中重金属含量的分析测试法比较研究

用电感耦合等离子体原子发射光谱仪 (ICP AES)和石墨炉原子吸收光谱仪 (GAAS)分别测定河蚬样品中镉和铬的含量 ,以比较不同测试方法对这两种重金属测定的影响。结果表明 :2种测试法对生物样品中镉和铬含量的测定结果都有显著的影响 ,同一样品中镉和铬含量的ICP AES测定值均显著高于其相应的GAAS测定值。相比ICP AES法 ,GAAS法对河蚬样品中镉和铬含量的测定更为准确。不同方法测定的镉和铬含量的差异程度分别为 1 8.8%和1 36.4 %。本研究显示 :不同测试法对铬含量测定结果的影响比对镉含量测定结果的影响更大。

Comparative Study on Two Test Methods for Determing the Heavy Metal Contents in Biological Samples

Inductively coupled plasm atomic emission spectrometer(ICP AES) and graphite furnace atomic absorption spectrometer(GAAS) were used to determine the Cd and Cr contents in Corbicula fluminea samples, and the effects of the two test methods on the determined Cd and Cr results were compared. It is shown from the test results that the determined contents of Cd and Cr in biological samples were significantly affected by the two test method, and for the same sample, the contents of Cd and Cr determined by ICP AES were all greater than those determined by GAAS. Compared with ICP AES method, GAAS method had a higer accuracy for determining the Cd and Cr contents in Corbicula fluminea samples, and the difference degree between the Cd and Cr contents determined by the two test methods were 18.8% and 136.4%, respectively, which indicates that the effect of different test methods on the determined Cr contents is more significant than that on the determined Cd contents.