![Sample our Physical Sciences journals, sign in here to start your FREE access for 14 days]({"type":"image" , "src" : "/sda/110819/TOC-Subject-Sample-2021-Physical-Sciences.jpg"})
Abstract
A new sample pretreatment method, solid-phase extraction combined with dispersive liquid–liquid microextraction (SPE-DLLME), was established for the sensitive determination of carbamates in environmental water samples. Three carbamates (carbofuran, carbaryl, and pirimicarb) were extracted from water samples by SPE. After the elution of the desired compounds from the sorbent using acetonitrile, DLLME technique was performed on the obtained solution. The analytes were determined by high performance liquid chromatography. The method provided ultra-enrichment factors for carbamates and ranged from 5408 to 7647. The calibration curves were linear in the range of 0.05–5 µg L−1 for carbofuran and carbaryl, and 0.01–5 µg L−1 for pirimicarb in water, respectively. The limits of detection (LODs) were in the ranges of 0.001–0.01 µg L−1. The proposed method was successfully applied for the selective extraction and determination of carbamates in environmental water samples.
ACKNOWLEDGMENT
This work was supported by the Education Department of Hubei Province (Grant no. T201101), the National Nature Science Foundation of China (Grant no. 20975030, 20835004), the Natural Science Foundation of Hubei province of China (Grant no. 2009CDB364), and the Specialist Fund of Hubei University (020091130-ky2006004). The authors would like to thank their colleagues for their valuable technical assistance.
Notes
a Maximum residue limit of EPA method for aqueous samples.