期刊
TALANTA
卷 105, 期 -, 页码 372-378出版社
ELSEVIER
DOI: 10.1016/j.talanta.2012.10.056
关键词
Gold nanoparticle coated sorbents; Solid phase extraction; Capillary liquid chromatography; Sulfonylurea herbicides; Water samples
资金
- Spanish Ministry of Science and Innovation [CTQ2010-15027]
- Junta de Comunidades de Castilla-La Mancha
- Fondo Social Europeo
- INCRECYT
Two new gold nanoparticle (NP) coated materials (silica supported on gold NP with and without ionic liquid) were synthesized for solid phase extraction of sulfonylurea herbicides (SUHs), such as bensulfuron-methyl (BSM), metsulfuron-methyl (MSM), pyrazosulfuron-methyl (PSM), thifensulfuron-methyl (TFM) and triasulfuron (TS), from water samples, followed by capillary liquid chromatography coupled to diode array detection (CLC-DAD). Several factors influencing the preconcentration efficiency of SUHs and its subsequent determination, such as pH of the sample, eluent and reusability of sorbents, have been investigated. Under the optimum conditions, the developed method allowed the determination of BSM, MSM, PSM, TFM and TS in a linear range between 0.05 and 1.00 mu g mL(-1), with relative standard deviation values lower than 45% (n=10), in all cases. Detection limits within 0.002-0.009 mu g mL(-1) range were achieved. The usefulness of the proposed method was demonstrated by the analysis of river water samples, in which recoveries between 83.9 and 105.0% were obtained. The Au-NP-ionic liquid-functionalized silica sorbent showed higher recoveries (selectivity) for the SUHs than the commercially available C-18 sorbents. (C) 2012 Elsevier B.V. All rights reserved.
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