液液萃取-HPLC-ICPMS联用技术测定水体中甲基汞

建立了二氯甲烷萃取,半胱氨酸-乙酸铵溶液反萃取,液相色谱-电感耦合等离子体质谱法测定水中甲基汞的方法。取样量为1 L时,方法检出限为0.1 ng/L,相对标准偏差为6.6%~13%,地表水、生活污水和工业废水3种实际水样的加标回收率分别为45.6%~70.5%、37.0%~65.6%、18.4%~61.8%。与5种甲基汞测定方法的前处理过程、分析仪器和检出限进行了比较,并讨论了无机汞的干扰情况及如何降低体系空白和消除无机汞干扰的质量控制手段。

Determination of Methyl Mercury in Water by HPLC-ICPMS with Liquid-liquid Extraction

The determination of methyl mercury by liquid chromatography-inductively coupled plasma mass spectrometry with liquid-liquid extraction was researched in this paper. The method limit of detection was 0.1 ng/L with 1 L sampling volume, and the relative standard deviation was ranged from 6.6%-13%. The recoveries for surface water, domestic waste water and industrial waste water were 45.6%-70.5%, 37.0%-65.6% and 18.4%-61.8%, respectively. The advantage of the method was compared with other five methods, and the quality control measures were investigated to enhance the sensitivity.