title: Photoinduced chemiluminescence determination of carbamate pesticides.
abstract: A liquid chromatography method with post-column photoinduced chemiluminescence (PICL) detection is proposed for the simultaneous determination of eight carbamate pesticides, namely aldicarb, butocarboxim, ethiofencarb, methomyl, methiocarb, thiodicarb, thiofanox and thiophanate-methyl. After chromatographic separation, quinine (sensitizer) was incorporated and the flow passed through an UV lamp (67 s of irradiation time) to obtain the photoproducts, which reacted with acidic Ce(iv) and provided a CL emission. The PICL method showed great selectivity for carbamate pesticides containing sulphur in their chemical structure. A solid-phase extraction process increased sensitivity (LODs ranging from 0.06 to 0.27 ng mL(-1)) and allowed the carbamate pesticides in surface and ground water samples to be determined, with recoveries in the range 87-110% (except for thiophanate-methyl, whose recoveries were between 60 and 75%). The intra- and inter-day precision was evaluated, with RSD ranging from 1.1 to 7.5% and from 2.6 to 12.3%, respectively. A discussion about the PICL mechanism is also included.
authors.affiliation: Instituto de Investigación para la Gestión Integrada de Zonas Costeras. Universitat Politècnica de València, C/Paranimf no 1, 46730 Grao de Gandía, Valencia, Spain. mocaic@qim.upv.es.
authors.forename: M
authors.initials: M
authors.lastname: Catalá-Icardo
authors.forename: S
authors.initials: S
authors.lastname: Meseguer-Lloret
authors.forename: S
authors.initials: S
authors.lastname: Torres-Cartas
mesh_terms: D002219:Carbamates / Q000032:analysis*; D002851:Chromatography, High Pressure Liquid / Q000295:instrumentation / Q000379:methods; D004867:Equipment Design; D060587:Groundwater / Q000032:analysis*; D057230:Limit of Detection; D049449:Luminescence; D008163:Luminescent Measurements / Q000295:instrumentation / Q000379:methods*; D010575:Pesticides / Q000032:analysis*; D052616:Solid Phase Extraction / Q000295:instrumentation / Q000379:methods; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D002219:Carbamates; D010575:Pesticides; D014874:Water Pollutants, Chemical