液液萃取-气相色谱法测定水中硝基氯苯类化合物

Determination of Nitrochlorobenzenes in Water by LLE-GC

建立了液液萃取-气相色谱法测定水中15种硝基氯苯类化合物的方法。中性条件下,在水样中加入氯化钠,用环己烷进行萃取,得到方法检出限为0.019~0.044μg/L,在10.0μg/L^1.0 mg/L范围内线性良好,相关系数均>0.999。加标水平为2.5μg/L时,空白水样加标回收率为74.8%~104%,相对标准偏差为4.79%~11.5%;实际水样加标回收率为69.1%~111%,相对标准偏差为5.83%~17.6%。方法适用于成分不复杂的实际水样中硝基氯苯类化合物的检测。

The method was developed for the determination of fifteen kinds of nitrochlorobenzenes in water by gas chromatography with liquid-liquid extraction. The optimal conditions were discussed in this research. The results indicated that the linearity was good from 10.0 p,g/L to 1.0 mg/L and the correlation coefficients were greater than 0. 999. The detection limits were from 0. 019 to 0. 044 bLg/L. The recoveries of the blank water sample were 74.8% - 104% , and the relative standard deviations were 4.79% 11.5%. The recoveries of the actual water sample were 69. 1% - 111% , and the relative standard deviations were 5.83% 17.6%. The current method is appropriate for the determination of nitrochlorobenzenes in water with simple matrix.