Journal
ANALYTICA CHIMICA ACTA
Volume 747, Issue -, Pages 29-35Publisher
ELSEVIER
DOI: 10.1016/j.aca.2012.08.015
Keywords
Magnetic solid phase extraction; Surfactant; Sulfonylurea herbicides; Environmental water
Categories
Funding
- A Foundation for the Author of National Excellent Doctoral Dissertation of PR China, Program for New Century Excellent Talents in University [NCET09-0738]
- National Natural Science Foundation of China [20707038]
- Beijing Metropolis
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A magnetic solid phase extraction (MSPE) method coupled with high-performance liquid chromatography (HPLC) was proposed for the determination of five sulfonylurea herbicides (bensulfuron-methyl, prosulfuron, pyrazosulfuron-ethyl, chlorimuron-ethyl and triflusulfuron-methyl) in environmental water samples. The magnetic adsorbent was prepared by incorporating Fe3O4 nanoparticles and surfactant into a silica matrix according to a sol-gel procedure, which can provide surfactant free extracts during the eluting step to avoid chromatographic interference. The prepared adsorbent was used to extract the sulfonylurea herbicides in several kinds of water samples. The main factors affecting the extraction efficiency, including desorption conditions, extraction time, sample volume, and sample solution pH were optimized. Under the optimum conditions, good linearity was obtained within the range of 0.2-50.0 mu g L-1 for all analytes, with correlation coefficients ranging from 0.9993 to 0.9999. The enrichment factors were between 1200 and 1410, and the limits of detection were between 0.078 and 0.10 mu g L-1. The proposed method was successfully applied in the analysis of sulfonylurea herbicides in environmental samples (tap, reservoir, river, and rice field). The recoveries of the method ranged between 80.4% and 107.1%. This study reported for the first time the use of MSPE procedure in the pre-concentration of sulfonylurea herbicides in environmental samples. The procedure proved to be efficient, environmentally friendly, and fast. (C) 2012 Elsevier B.V. All rights reserved.
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