The ionic liquid (IL) 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide was synthesized, and impregnated into the aluminum metal-organic framework (MOF) to create the composite material. This composite material was then used to determine of organochlorine pesticides, using dispersive micro solid phase extraction (SPE) followed by gas chromatography with an electron capture detector. The optimum conditions were found to be an eluent solution volume of 0.75 mL of methanol, an adsorbent amount of 30 mg, an extraction time of 15 min, and an extraction temperature of 35 °C, with a pH range of 6–7. The linear range (LR) was obtained between 0.05 and 50 µg L−1 for β-HCH and δ-HCH and 0.01–50 µg L−1 for other organochlorine pesticides. Under optimal conditions, the proposed method demonstrated good linearity (R2 = 0.9969–0.9998) and low detection limits (0.0027–0.0187 µg L−1). The intra- and inter-day precision, expressed as relative standard deviations, were 2.41–5.44% and 2.36–5.38%, respectively, for 1 and 10 µg L−1 organochlorine pesticide standards. The enrichment factor (EF) for organochlorine pesticides using 0.75 mL of eluent was 80. The developed method was successfully applied to green tea, black tea, orange juice, and apple juice samples. This method offers high recovery, repeatability, simplicity, and applicability for the analysis of pesticides.
Pamık et al. (Tue,) studied this question.
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