title: Ionic liquids supported on magnetic nanoparticles as a sorbent preconcentration material for sulfonylurea herbicides prior to their determination by capillary liquid chromatography.
abstract: A magnetic material based on N-methylimidazolium ionic liquid and Fe(3)O(4) magnetic nanoparticles incorporated in a silica matrix has been used to extract and preconcentrate sulfonylurea herbicides, such as thifensulfuron methyl (TSM), metsulfuron methyl (MSM), triasulfuron (TS), tribenuron methyl (TBM) and primisulfuron methyl (PSM) from polluted water samples, prior to their analysis by capillary liquid chromatography with a diode array detector (DAD). Under the optimum conditions, this method allows the determination of TSM, MSM, TS, TBM and PSM in a linear range between 5 and 100 ng mL(-1), with relative standard deviation values lower than 5.3% (n = 10), in all cases. Detection limits ranging between 1.13 and 2.95 ng mL(-1) were achieved. The usefulness of the proposed method was demonstrated by the analysis of river water samples, obtaining recoveries higher than 91%.
authors: Department of Analytical Chemistry and Food Technology, University of Castilla-La Mancha, Ciudad Real, Spain.
authors: Mohamed
authors: M
authors: Bouri
authors: Madalina
authors: M
authors: Gurau
authors: Rachid
authors: R
authors: Salghi
authors: Igor
authors: I
authors: Cretescu
authors: Mohammed
authors: M
authors: Zougagh
authors: Ángel
authors: Á
authors: Rios
mesh_terms: D000327:Adsorption; D002853:Chromatography, Liquid / Q000379:methods; D006540:Herbicides / Q000302:isolation & purification*; D007093:Imidazoles / Q000737:chemistry; D052578:Ionic Liquids / Q000737:chemistry*; D057230:Limit of Detection; D058185:Magnetite Nanoparticles / Q000737:chemistry*; D045483:Rivers / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry; D052616:Solid Phase Extraction / Q000379:methods*; D013453:Sulfonylurea Compounds / Q000302:isolation & purification*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*
chemical_list: D006540:Herbicides; D007093:Imidazoles; D052578:Ionic Liquids; D058185:Magnetite Nanoparticles; D013453:Sulfonylurea Compounds; D014874:Water Pollutants, Chemical; D012822:Silicon Dioxide; C018100:1-methylimidazole