本文件规定了在苯基化和溶剂萃取后，通过气相色谱-质谱法测定过滤水样中烷基汞化合物的方法。 本方法适用于地表水和废水中单个甲基汞（MeHg）和乙基汞（EtHg）化合物的测定。 该方法适用于每种化合物的汞质量为0.2μg/l至10μg/l的样品。根据基质的不同，该方法也适用于适当稀释样品或减小样品尺寸后的更高浓度。

This document specifies a method for the determination of alkylmercury compounds in filtered water samples by gas chromatography-mass spectrometry after phenylation and solvent extraction. This method is applicable to determination of individual methylmercury (MeHg) and ethylmercury (EtHg) compounds in surface water and waste water. The method can be applied to samples containing 0,2 μg/l to 10 μg/l of each compound as mercury mass. Depending on the matrix, the method may also be applicable to higher concentrations after suitable dilution of the sample or reduction in sample size.