GC-CVAFS法测定鱼体内甲基汞的分析方法研究

Determination of Methyl Mercury in Fish Using GC-CVAFS

采用200 g/L的KOH溶液消解鱼样、GC-CVAFS方法检测鱼体内的甲基汞。对鱼汞国际标准样品(TORT-2,DORM-2)实测结果与推荐值间误差小于2.3%,测定值的相对标准偏差为4.77%,方法检出限为0.002 ng/g,本方法灵敏、可靠,适合鱼体中甲基汞的准确测定。

The methyl mercury in fish tissue was determined by the GC - CVAFS method after digesting the sample with 20% KOH. The average relative error between the determined and the certified values of fish certified reference materials（TORT- 2, DORM - 2） was 2.3%, and the relative standard deviation（RSD% ） of the determined values was 4.77%. The detection limit was 0. 002 ng/g. The proposed method is sensitive and reliable and is suitable for the determination of MeHg in fish tissue.