Objective: To establish a method for the determination of chlorothalonil in air by filtration membrane sampling, solvent elution and gas chromatography. Methods: PTFE filter was used for sampling, eluted with dichloromethane, separated by DB-5 capillary column, and determined by FID. Results: The standard curve was used for quantitative detection, and the correlation of chlorothalonil in the range of 15 μg/ml-300 μg/ml, R(2)=0.9999. The detection limit of this method was 1.70 μg/ml and the lower quantitative limit was 5.70 μg/ml. The minimum detected concentration was 0.045 mg/m(3) (75L air sample was collected) . The recovery rate was 90.14%-91.81%. The precision of the same batch was 1.5%-1.8%, and that of different batches was 2.3%-3.8%. The sampling efficiency can reach above 95%; The samples can be stored for 14 days at room temperature. Conclusion: The results show that the method of filtration membrane sampling-solvent elude-gas chromatography is suitable for the determination of chlorothalonil in the air.
目的： 建立空气中百菌清的滤膜采样-溶剂洗脱气相色谱检测方法。 方法： 采用聚四氟乙烯滤膜采样，2 ml二氯甲烷溶剂洗脱，经DB-5毛细管色谱柱分离，火焰离子化检测器测定。 结果： 百菌清用标准曲线法定量，溶液浓度在15~300 μg/ml内有较好线性相关性，R(2)=0.999 9；该仪器的检出限为1.70 μg/ml、定量下限为5.70 μg/ml；该方法的最低检出浓度为0.045 mg/m(3)、最低定量浓度为0.15 mg/m(3)（以75 L空气样品计）；样品加标回收率在90.14%~91.81%；批内精密度在1.5%~1.8%、批间精密度为2.3%~3.8%；聚四氟乙烯滤膜对空气中百菌清采样效率可达95%以上；样品在常温条件下14 d保持稳定。 结论： 实验结果表明，该研究建立的空气中百菌清的滤膜采样-溶剂洗脱气相色谱检测方法适用于工作场所空气中百菌清含量检测。.
Keywords: Capillary tubing; Chlorothalonil; Gas, Chromatography; Solvents; Workplace.