气相色谱法测定工业废水中的氯代苯类

本文提供了测定工业废水中12种氯苯的简便方法:ECD-GC法.水样用石油醚萃取、经硅胶柱净化,使氯苯与六六六、DDT等完全分离.采用SF-96改性的有机皂土填充柱,可在恒温下将12个氯苯完全分离.当水中氯苯浓度在10mg/250ml(一氯苯)和0.00126mg/250ml(1,2,3,5-四氯苯)之间时,方法的回收率为93.5％.最大相对标准偏差小于4％.

GAS CHROMATOGRAPHIC DETERMINATION OF CHLOROBENZENES IN INDUSTRIAL WASTEWATER

A gas chromatographic method for determination of chlorobenzenes in wastewater was described. A water sample (250ml) was transferred into a 500ml separatory funnel and extracted with 25ml petroleum ether. An extract of 3ml was passed through a silica column containing 3g activated silica gel and a 2cm-layer of anhydrous sodium sulfate. Column was then eluted with 10ml petroleum ether. 8ml eluate was collected and analyzed by ECD gas chromatography. Bentone-34 modified with SF-86 on 80-100 mesh Chromosorb W. HP was used for column packing. All of the 12 chlorobenzenes were completely separated. The mean recovery for high and low level chlorobenzenes was 93.5% and the maximum relative standard deviation was less than 4 %. Elution conditions for chlorobenzenes in presence of BHC and DDT were presented and MDLs for each chlorobenzene were also examined. The method described here possesses great advantage over others to analysis of chlorobenzene mixtures. It has been successfully applied to determination of chlorobenzenes in industrial wastewater as well.