Abstract
A dispersive liquid-liquid microextraction method was developed for the determination of fungicides (diethofencarb and pyrimethanil) in aqueous samples. It is based on the use of solidified floating organic drops combined with high-performance liquid chromatography. Extraction solvent and dispersive solvent, extraction time and salt effect were optimized. Under optimized conditions, the enrichment factors for a 5 mL water sample are between 145 and 161. The limits of detection for diethofencarb and pyrimethanil are 0.24 and 0.09 μg ∙ L−1, respectively. The method offers good repeatability and high recovery. Compared with dispersive liquid-liquid microextraction, it has a higher enrichment factor, high precision due to the ease with which the solidified floating phase is transferred, thus avoiding the loss of analyte. Toxic solvents were replaced by 1-dodecanol with its much lower toxicity. The method has been successfully applied to the determination of the two fungicides in tap water, lake water, and river water.
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The project was supported by National Natural Science Foundation of China (No. 30971948), Scientific and Technological Brainstorm Project of Wuhan (No. 200760423155).
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Cheng, J., Xiao, J., Zhou, Y. et al. Dispersive liquid-liquid microextraction based on solidification of floating organic droplet method for the determination of diethofencarb and pyrimethanil in aqueous samples. Microchim Acta 172, 51–55 (2011). https://doi.org/10.1007/s00604-010-0458-2
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DOI: https://doi.org/10.1007/s00604-010-0458-2