Micro-extraction procedure for monitoring organochloride pesticides in water samples

The proposed method, based on liquid-liquid micro-extraction followed by gas-chromatography, is suitable for monitoring organic-chlorine pesticides in different kind of water matrices: mineral, rain, river and waste water. Using this method only 1 mL of extractive organic solvent every 200 mL of water sample is needed. The complete separation of hexane from an aqueous matrix by means of a micro-extractor system gives an good recovery in the case of drinking water and also in the case of aqueous matrices containing a large amount of organic compounds. The objective of this work was to develop a rapid, simple and economic procedure involving a low consumption of toxic solvent organic in screening analyses to determine the presence of organic-chlorine pesticides in water.