A comparative study was carried out to determine 21 pesticides in environmental water samples by high performance liquid chromatography using both liquid-liquid (LLE) and solid-phase (SPE) extractions. The reproducibility of the SPE method is better than employing LLE with dichloromethane. but SPE was more efficient to recover metomyl, dimethoate, chlorpyrifos ethyl and carbophenothion.
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Parrilla et al. (1997) studied this question.
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