Abstract:
To effectively monitor the residues of organochlorine pesticides (OCPs) in environmental water, this study developed a low-cost, weak matrix effect, and economically convenient solid-phase microextraction method to determine 13 OCPs residues in water. This approach used a highly selective silicone rubber (SR) thin film as the solid-phase adsorbent to prepare an easy-operate extraction bottle. After the optimization of the extraction mode, extraction time, elution solvent, and elution mode, vortexing for 10 min was selected for the adsorption of target compounds by the SR film, and 5 mL of
V (hexane) :
V (ethyl acetate) = 1 : 1 was used to elute the target compounds from SR film. The detection of 13 OCPs was performed by gas chromatography. The results showed that the limits of detection for the 13 OCPs ranged from 0.001 to 0.132 μg/L, and the limit of quantification was 0.2 μg/L. The linearity was good with the determination coefficients (
R²) higher than 0.9973. The average recoveries of 13 OCPs in water spiked at three levels of 0.2, 1, and 20 μg/L were in a range of 73%-109% with relative standard deviations of 0.5%-13% (
n=5). The method was finally employed for the monitoring of the 13 OCPs in several water samples collected from Chao Lake, Nanfei River and other major rivers in Hefei City, and the highest detection mass concentration was 3.64 μg/L. Compared with the previously reported methods, the proposed method features high sensitivity, simplicity in operation, and low cost, showing promising prospects in the multi-residue determination of OCPs in environmental water.