Development of Directly Suspended Droplet Micro Extraction Method for Extraction of Organochlorine Pesticides in Water Samples

A simple and efficient directly suspended droplet micro extraction in conjunction with gas chromatography-electron capture detector (gc-ecd) has been developed for extraction and determination of organochlorine pesticides (ocps) from water samples. in this technique a micro drop of 1-dodecanol is delivered to the surface of an aqueous sample while being agitated by a stirring bar in the bulk of solution. factors relevant to the extraction efficiency were studied and optimized. the optimized extraction conditions were extraction solvent: 1-dodecanol; extraction temperature: 60◦c; nacl concentration: 0.5m; solvent extraction volume: 10 μl; stirring rate: 800rpm and the extraction time: 20 min. the detection limits of the method were in the range of 0.066^–1.85 ngl^−1, relation standard deviation (n=5) range were 0.102 - 0.964. a good linearity (r^ 2 ≥0.995) and a relatively broad dynamic linear range (25–2600ng.l^−1) were obtained and recoveries of method were in the range of 90.729% - 102.343%. finally, the proposed method was successfully utilized for pre concentration and determination of ocps in different real samples. we successfully developed a method based on the dsdme technique combined with capillary gc-ecd for the analysis of ocps in the water samples and compared with the conventional sample preparation method such as lpme.