Combination of solid-phase extraction and dispersive liquid–liquid microextraction for detection of cypermethrin and permethrin in environmental water

摘要

A new solid-phase extraction and dispersive liquid–liquid microextraction (SPE-DLLME) method coupled with gas chromatography electron capture detection (GC-ECD)was established for the detection of cypermethrin and permethrin in river water. The samples were firstly extracted using a large-volume SPE procedure and the eluents of SPE were further purified and enriched by the following DLLME. Good linearity was observed in the range of 0.015–3.87 μg L?1 for cypermethrin and 0.065–16.2 μg L?1 for permethrin with the correlation coefficient (r) ≥ 0.9995. The limits of detection based on S/N = 3 were 0.48 and 3.81 ng L?1 for cypermethrin and permethrin, respectively. Under optimized conditions, the enrichment factors for cypermethrin and permethrin were 1545- and 2138-fold, respectively. The developed method was successfully used to detect the two pyrethroid residues in river water samples...