顶空单液滴微萃取-气相色谱法测定水中卤代烃和烷基苯的含量

Determination of alkyl halides and alkyl benzenes in water sample by headspace single-drop microextraction/GC

目的:建立顶空单液滴微萃取-气相色谱法,用于测定饮用水和地表水中3种挥发卤代烃和6种烷基苯污染物。方法:采用顶空单液滴微萃取法对水中的待测物进行提取和浓缩,进行提取条件优化后,以GC-FID进行定量测定。结果:在优化条件下,顶空单液滴微萃取法对水中卤代烃和烷基苯有显著的浓缩富集效率,该测定方法具有良好的线性(R2≥0.994)、重复性(RSD=6.6%)和回收率(95.7%～104.2%)。结论:顶空单液滴微萃取法适合于水中有机挥发物的分析测定。

Aim： To establish a headspace single-drop microextraction/GC method for the determination of alkyl halides and alkyl benzenes in water sample. Methods： The target analytes were extracted and enriched by headspace singledrop microextraction with optimized parameters and then detected by GC/FID. Results： The proposed method, using the optimized parameters, showed good linearity, repeatabilily and recovery with high enrichment efficiency. Conclu- sion：This method has proved to be simple and sensitive with low pollution. It could be used for the determination of organic compoundsin water samples.