title: Solventless sample preparation for pesticides analysis in environmental water samples using solid-phase microextraction-high resolution gas chromatography/mass spectrometry (SPME-HRGC/MS).
abstract: Solid-phase micro-extraction (SPME) coupled on line with high resolution gas chromatography and mass spectrometric detection is described for the analysis of pesticides in environmental water samples. Experiments were performed in order to optimize the SPME extraction conditions for selected pesticides including tiomethon, trichorfon, dimethoate, diazinon, malathion, dicofol, methidathion, ethion, bromopropylate and pyrazophos from spiked water solutions. To enhance the SPME efficiency, experimental conditions including the fiber composition, stirring rate, temperature, adsorption time, desorption time and salt concentration were optimized. After validation, the SPME-GC/MS methodology was applied to real-world environmental water samples.
authors.affiliation: Institute of Chemistry of São Carlos, University of São Paulo, São Carlos, São Paulo, Brazil.
authors.forename: Dalva A
authors.initials: DA
authors.lastname: Souza
authors.forename: Fernando M
authors.initials: FM
authors.lastname: Lanças
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry; D000327:Adsorption; D004129:Dimethylpolysiloxanes / Q000737:chemistry; D005618:Fresh Water / Q000737:chemistry; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods*; D019016:Mineral Fibers; D009994:Osmolar Concentration; D010573:Pesticide Residues / Q000032:analysis* / Q000302:isolation & purification; D011092:Polyethylene Glycols / Q000737:chemistry; D012828:Silicones / Q000737:chemistry; D012997:Solvents; D013696:Temperature; D013997:Time Factors; D014753:Vinyl Compounds / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000302:isolation & purification
chemical_list: D000180:Acrylic Resins; D004129:Dimethylpolysiloxanes; D019016:Mineral Fibers; D010573:Pesticide Residues; D012828:Silicones; D012997:Solvents; D014753:Vinyl Compounds; D014874:Water Pollutants, Chemical; D011092:Polyethylene Glycols; C006903:carbopol 940; C013830:baysilon; C004985:divinyl benzene