期刊
MICROCHEMICAL JOURNAL
卷 133, 期 -, 页码 650-657出版社
ELSEVIER
DOI: 10.1016/j.microc.2017.03.007
关键词
Microextraction; Supramolecular based-solvent; 1-decanol reverse micelles; Sugarcane herbicides; Water matrices; Liquid chromatography
资金
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq) [481669/2013-2, 305552/2013-9, 472670/2012-31]
- PRO-FORENSES (CAPES) Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES) [25/2014]
- FundacAo AraucAria do Parana [163/2014]
- Instituto Nacional de Ciencia e Tecnologia de Bioanalitica (INCT) [573672/2008-3]
A supramolecular solvent-based microextraction procedure for preconcentration of four most common sugar-cane herbicides (diuron, hexazinone, ametryn and tebuthiuron) from groundwater and surface water samples with further determination by High Performance Liquid Chromatography with Photodiode Array detector (HPLC-DAD) is proposed. The proposed method involves the use of a supramolecular solvent in which reverse micelles of 1-decanol are dispersed in tetrahydrofuran/water. The extraction of four herbicides performed at pH 4.0 requires low sample volume (10.0 mL), low extraction time (30 s of extraction and 10 min of centrifugation), low amount of organic solvents (50 L of 1-decanol and 100 mu L, of THF) and provides high preconcentration. factors (48.5 to diuron, 15.1 to hexazinone, 47.4 to ametryn and 21.0 to tebuthiuron). The limits of detection (LOD), quantification (LOQ), the precision (RSD) and the accuracy (RE) of the developed method ranged between 0.13 and 1.45 mu g L-1, 0.43-4.85 mu g L-1, 2.4-6.8% and 0.6-62%, respectively. Recovery values obtained by applying the proposed method in spiked groundwater and surface water samples at mu g L-1 levels varied in the range of 95-111%. The quantification of some analyzed herbicides in natural waters showed dearly the importance of investigates herbicides concentrations in regions of sugarcane cultivation predominance. (C) 2017 Elsevier B.V. All rights reserved.
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