Author/Authors :
Mercedes Barriada-Pereira، نويسنده , , M and Concha-Gra?a، نويسنده , , E and Gonz?lez-Castro، نويسنده , , M.J and Muniategui-Lorenzo، نويسنده , , S and L?pez-Mah??a، نويسنده , , P and Prada-Rodr??guez، نويسنده , , D and Fern?ndez-Fern?ndez، نويسنده , , E، نويسنده ,
Abstract :
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).
