[Membrane sampling for the determination of chlorothalonil in the air of workplaces-solvent analysis-Gas Chromatography].

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.