顶空气相色谱法测定水和废水中的邻二氯苯

采用顶空采样，填充柱分离，ECD测定水和废水中的邻二氯苯，在柱温150℃，进样室温200℃，ECD温300％下，邻二氯苯的保留时间为3．78min，该方法灵敏度高，最低检出浓度为0．02μg／L；精密度好，对标准样品六次测定的相对标准偏差小于3．9％；准确度高，加标回收率在95％～104％之间。操作简便、测定快速，克服了萃取法烦琐、有毒、易污染色谱柱等缺点。

Determination of O-dichlorobenzene in Water and Wastewater by Head-space Gas Chromatography

The contents of o - dichlorobenzene in both water and waste water are determined by the head - space gas chroma- tography which includes head - space sampling, packed column separation and ECD determination. The temperature in the col- umn, injector and room is 150℃, 200℃, and 300℃ separately, while the retention time of o - dichlorobenzene is 3.78 minutes. This method is sensitive, precise and accurate. The minimum detectable concentration is 0. 02 μg/L and the relative standard de- viation of six standard samples is less than 3.9% with recoveries rate of 95% to 104%. This method is simple and quick, avoi- ding the shortcomings of extraction.