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Due to the widespread use of toxic chemicals in most workplaces which can lead to toxic effects on human, various chemical extraction techniques have been defined for the analysis of these toxic substances in air, water and biological samples. The purpose of this research was the extraction of toluene and methyl ethyl ketone from aquatic samples with needle trap device together with one commercial sorbent. Methods: In this research, needle trap device was used to extract toluene and methyl ethyl ketone in aquatic samples. Needles (size 20) were packed with polydimethylsiloxane (PDMS) and extraction was performed using dynamic headspace needle trap device. The analysis was conducted using gas chromatography with flame ionization detector and optimized extraction conditions of the two substances were obtained. Results: Results showed that the optimum temperature and time of extraction was similar for toluene and methyl ethyl ketone (30°C, 30 minutes); but, the reproducibility of results and the calibration curve obtained for toluene were better than those of methyl ethyl ketone. conclusions: Needle trap technique is inexpensive, sensitive and portable; also, this method has a good recovery to extract small amounts of toluene and methyl ethyl ketone from aquatic samples with PDMS. Received: 22.05.2016 Accepted: 02.09.2016

Developed a needle trap device with PDMS sorbent for microextraction of toluene and methyl ethyl ketone from aquatic samples using dynamic headspace