TY - RPRT TI - Optimization of solid-phase extraction and solid-phase microextraction for the determination of alpha- and beta-endosulfan in water by gas chromatography-electron-capture detection. AU - M C López-Blanco AU - B Reboreda-Rodríguez AU - B Cancho-Grande AU - J Simal-Gándara PY - 2002 DO - 10.1016/s0021-9673(02)01232-3 UR - https://pubmed.ncbi.nlm.nih.gov/12462621/ ID - 12462621 ER -