Pesticide vapours in confined atmospheres. Determination of dichlorvos by SPME-GC-MS at the microg m(-3) level.
A method based on SPME is described for assessing the gaseous dichlorvos concentration in confined atmospheres like a greenhouse after a pesticide application. Sampling was made by using SPME with PDMS fibres immersed into a 250 mL sampling flask into which air samples were dynamically pumped from the analysed atmosphere. Sampling duration was 40 min and samples were then analysed by GC-MS. Calibration was performed from a vapour saturated air sample and gas phase diluted samples, and this procedure afforded a curve with a regression coefficient (R2) higher than 0.98. The repeatability of these measurements was observed with an RSD of 2.5%. This analysis procedure was then applied for the determination of gaseous dichlorvos concentrations versus time, in the atmosphere of an experimental 8 m2 and 20 m3 greenhouse. The pesticide was sprayed according to real cultivation conditions and measurements were made from 2 up to 74 h after application affording observed concentrations in the range of decades and hundreds of microg m(-3) (corresponding limits of detection and quantification were found at the level of a few microg m(-3)).
Sanusi
Astrid
A
Equipe Périgourdine de Chimie Appliquée, LPTC--Université Bordeaux 1/CNRS, UMR 5472, BP 1043, 24001 Périgueux Cedex, France.
Ferrari
Federico
F
Millet
Maurice
M
Montury
Michel
M
D000392:Air Movements; D016902:Air Pollution, Indoor / Q000032:analysis*; D002138:Calibration; D002623:Chemistry Techniques, Analytical / Q000379:methods; D004006:Dichlorvos / Q000032:analysis* / Q000737:chemistry; D008401:Gas Chromatography-Mass Spectrometry; D007306:Insecticides / Q000032:analysis* / Q000737:chemistry; D012680:Sensitivity and Specificity; D014835:Volatilization
D007306:Insecticides; D004006:Dichlorvos