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Abstract
A novel ionic liquid modified polymer was employed as an adsorbent for dispersive solid phase extraction for the determination of cyanazine and atrazine in tomatoes. This polymer was advantageous over conventional solid phase extraction in terms of the operational simplicity, speed, handling of large sample volumes, and recovery. Extraction parameters, such as the adsorbent amount, adsorbent time, elution solvent, elution time, and pH of aqueous samples were optimized. The optimized extraction conditions included 50 mg of 1-ethyl-3-methylimidazolium bromide modified polymer as the adsorbent, dichloromethane as the eluent, and 6 min as the adsorption time. Under the optimized conditions, the recovery from tomato samples ranged from 72.0 to 95.1%, which was comparable to tomato juice. The limits of detection for cyanazine and triazine were 0.51 ng/mL and 0.35 ng/mL, respectively.
Acknowledgments
This study was supported by Basic Science Research Program through the National Research Foundation (NRF) of Korea funded by the Ministry of Education, Science and Technology (No. 2011-0010673), the National Natural Science Foundation of China (21011140338, 20905019) and Hebei University Special Funds for Medical Science Construction Project (2013A1002).
Notes
–, Cannot be calculated (the disturbance of impurities).
-, not mentioned in the reference.