Microwave-assisted extraction versus Soxhlet extraction in the analysis of 21 organochlorine pesticides in plants.
A method to determine 21 organochlorine pesticides in vegetation samples using microwave-assisted extraction (MAE) is described and compared with Soxhlet extraction. Samples were extracted with hexane-acetone (1:1, v/v) and the extracts were cleaned using solid-phase extraction with Florisil and alumine as adsorbents. Pesticides were eluted with hexane-ethyl acetate (80:20, v/v) and determined by gas chromatography and electron-capture detection. Recoveries obtained (75.5-132.7% for Soxhlet extraction and 81.5-108.4% for MAE) show that both methods are suitable for the determination of chlorinated pesticides in vegetation samples. The method using microwave energy was applied to grass samples from parks of A Coruña (N.W. Spain) and to vegetation from the contaminated industrial area of Torneiros (Pontevedra, N.W. Spain).
Barriada-Pereira
M
M
University Institute of Environment, Department of Analytical Chemistry, University of A Coruña, Campus da Zapateira s/n, E-15071, A Coruña, Spain.
Concha-Graña
E
E
González-Castro
M J
MJ
Muniategui-Lorenzo
S
S
López-Mahía
P
P
Prada-Rodríguez
D
D
Fernández-Fernández
E
E
D002849:Chromatography, Gas / Q000379:methods*; D006843:Hydrocarbons, Chlorinated; D007306:Insecticides / Q000032:analysis*; D008872:Microwaves; D010944:Plants / Q000737:chemistry*; D015203:Reproducibility of Results
D006843:Hydrocarbons, Chlorinated; D007306:Insecticides