顶空单液滴微萃取-气相色谱法测定水中苯系物

Gas Chromatographic Determination of Benzene Homologues in Water with Head-Space Single-Drop Microextraction

采用顶空单液滴微萃取样品处理方法分离富集水中苯系物,用气相色谱法进行测定。考察了不同萃取剂、萃取条件对检测结果的影响。苯、甲苯、对二甲苯的检出限分别为0.05,0.05,0.03μg.L-1,三种苯同系物的相关系数分别为0.999 2,0.998 5和0.997 2,回收率分别为98.3%,101.9%和97.3%。

Benzene homologues in water were separated and enriched by head-space single-drop microextraction and determined by gas chromatography, Effects of different kinds of extraction solvents and extraction condition on the testing results were studied thoroughly. Detection limits （S/N=3） of the method were found to be 0.05μg·L^-1 for benzene and toluene, and 0. 03 μg·L^-1for p-xylene. Linear relationships between peak area and concentration of the homologues within 10μg·L^-1 were obtained for all the 3 compounds. Correlation coefficients of 0. 999 2, 0. 998 5 and 0. 997 2 were found for the 3 compounds respectively. Recovery was tested by adding 2μg·L^-1 of the standard solutions to a sample of waste water, results obtained were 98.3% for benzene, 101.9% for toluene and 97. 3% for p-xylene.