Determination of N-methylcarbamate pesticides using flow injection with photoinduced chemiluminescence detection |
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Authors: | José Luis López-Paz Mónica Catalá-Icardo Adrián Langa-Sánchez |
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Institution: | 1. Centro de Reconocimiento Molecular y Desarrollo Tecnológico (IDM). Departamento de Química. Universitat Politècnica de València. Camino de Vera s/n, 46022 Valencia, Spainjolopa@qim.upv.es;3. Instituto de Investigación para la Gestión Integrada de Zonas Costeras (IGIC). Universitat Politècnica de València. C/Paranimf no1, 46730 Grao de Gandía, Valencia, Spain |
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Abstract: | A sensitive, economic, rapid and simple method for the determination of four N-methylcarbamate pesticides: methomyl (2.0–80 μg L?1), aldicarb (5.0–50 μg L?1), butocarboxim (2.0–60 μg L?1) and oxamyl (2.0–60 μg L?1); is reported. It relies on the coupling of photoinduced chemiluminescence (PICL) detection with flow injection (FI) methodology. The automation of FI together with the use of light as a reagent decreased the environmental impact of the analysis. The proposed method was based on the oxidation of these pesticides, previously irradiated on-line with UV light, with cerium(IV), using quinine as a sensitiser. Limits of detection below the legal limits (100 ng L?1) established by the European Union for drinking waters were obtained without the need of preconcentration steps. A good inter-day reproducibility (1.6–6.4%, n = 5), repeatability (rsd = 2.7 %, n = 25) and high throughput (123 h?1) were achieved. The method was successfully applied to the determination of methomyl in natural waters with mean recoveries ranging from 90% to 98%. |
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Keywords: | flow injection N-methylcarbamates photoinduced chemiluminescence pesticides water |
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