液液萃取-气相色谱法测定饮用水中硝基苯类化合物

采用液液萃取－气相色谱法测定饮用水中10种硝基苯类化合物，通过萃取条件优化试验，选择正己烷为萃取剂，使目标物在0μg／L～38.5μg／L之间线性良好，检出限为0.002μg／L ～0．005μg／L。实际饮用水样的加标回收率为80.8％～104％，RSD＜3％。用该方法测定桂林市4个水厂饮用水，结果硝基苯、间－二硝基苯、2，4－二硝基氯苯未检出，其余7种硝基苯类化合物虽有检出，但检出值均低于标准规定的限值。

Determination for Nitrobenzene compounds of Drinking Water by Liquid liquid Extraction Gas Chromatography

A liquid-liquid extraction gas-chromatography method by different solvents for determination of nitrobenzene-compounds in drinking water was established.The determination of extraction by n-hexane extrac-tion of samples detection limit,precision and the recovery rate is superior to the other three solvents,nitroben-zene-compounds spiked recovery rates come to be 80.8%~104%,the relative standard deviations（RSD）were less than 3%,the method determination limits were 0.002 μg/L~0.005 μg/L.This method can meet the test requirements.Drinking water samples from 4 water factories in Guilin were analyzed by optimized test method. The results indicates that,nitrobenzene,1,3-dinitrobenzene and 1-chloro-2,4-dinitrobenzene were not detected, other 7 nitrobenzene-compounds were detected,but the concentrations were all less than environmental quality standards for surface water and standards for drinking water quality in the provides of limited value.