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Abstract: Objective: To evaluate a sol-gel coated molecularly imprinted polymer (MIP) fiber for solid-phase microextraction (SPME) and to establish a method for determination of dimethoate in environmental water by molecularly imprinted polymer-solid phase microextraction coupled with gas chromatography. Methods: The characteristics of the MIP fiber was evaluated in comparison with the nonimprinted polymer (NIP) fiber. After optimization of extraction parameters, the method was evaluated through determination of dimethoate in tap water and lake water. Results: At the optimum conditions, the new fiber exhibited desirable thermal stability and chemical durability, and had a good selective extraction ability for dimethoate in water sample. The proposed method was linear in the range of 12.5-2500 μg/L with a coefficient of 0.9997. The limit of detection was 97.0 ng/L. The relative standard deviation of 5 replicates was 6.45%. Satisfactory recoveries of 92.0%-114.2% were obtained in tap water and 88.9%0102.1% in lake water. Conclusion: The MIP-SPME fiber obtained has a good stability and performs well in aqueous recognition. This method is simple, reliable, and accurate, and is suitable for determination of dimethoate in water samples.
Template and target information: dimethoate
Author keywords: sol-gel, molecularly imprinted polymer, solid phase microextraction, Dimethoate