室内空气中四氟苯菊酯的气相色谱-电子捕获器测定法

Determination of Transfluthrin in Indoor Air under Different Ventilated Conditions

目的采用气相色谱-电子捕获器(GC-ECD)法测定使用气雾杀虫剂后室内空气中残留的四氟苯菊酯。方法在实验房间内布置4个采样泵,设定门窗开启和关闭两种实验条件。用OVS-2吸附管采集室内空气中的气雾杀虫剂样品,经甲苯萃取后,利用GC-ECD法检测。结果四氟苯菊酯的保留时间为4.944 min,内标物毒死蜱的保留时间为6.608 min。该方法检测空气中四氟苯菊酯的线性范围为0.22～4.53 ng/L,萃取回收率为90.3%～112%。无论空气交换率的大小,空气中四氟苯菊酯浓度的衰减速率在喷洒杀虫剂后的不同时间段有所不同。结论采用GC-ECD法对不同通风条件下使用气雾杀虫剂后室内空气中残留的四氟苯菊酯进行检测,重现性好;空气交换率对四氟苯菊酯的残留的影响随时间和位置的不同而变化。

Objective To determine the concentration of transfluthrin in indoor air after use of aerosol pesticide with GC- ECD. Methods Four air samplers were set in the experimental room and the samples were collected by OVS-2 tubes, which was followed by extracting transfluthrin with toluene and analyzing by GC using an election capture detector. Results The retention time of transfluthrin and chlopyrifos （internal standard） was 4.944 min and 6.608 min respectively. The linear concentration range of tranfluthrin was 0.22-4.53 ng/L and the rate of recovery was 90.3%-112%. The declining rates of air transfluthrin at the different period changed sharply no matter what the air exchange rates were. Conclusion This method is effective with good reproducibility and accuracy. The effect of air exchange rate on transfluthrin residual will change at different sampling time and sampling site.