Fast determination of thiacloprid by photoinduced chemiluminescence
| Autor: | Mónica Catalá-Icardo, José Luis López-Paz, Laura María Pérez-Plancha |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
Detection limit
Reproducibility Solid-phase extraction Chromatography Chemiluminescence Flow injection Chemistry Extraction (chemistry) Analytical chemistry chemistry.chemical_element Water Sulfuric acid Thiacloprid law.invention chemistry.chemical_compound Cerium Photoreaction law QUIMICA ANALITICA Solid phase extraction Instrumentation Spectroscopy |
| Zdroj: | RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia instname |
| ISSN: | 1943-3530 |
| Popis: | A new and sensitive application of the chemiluminescence detection has been developed for the determination of the pesticide thiacloprid in water. It was based on the on-line photoreaction of thiacloprid in basic medium, with quinine acting as sensitizer of the chemiluminescent response; Cerium (IV) in sulfuric acid medium was used as oxidant. A high automation and reproducibility was provided by a flow injection analysis (FIA) manifold. The validation of the method was performed in terms of selectivity, linearity, LOD, precision and accuracy. Liquid chromatography with UV detection was used as reference for mineral, tap, ground and spring water samples. The proposed method is fast (throughput of 130 h-1), sensitive (LOD of 0.8 ng mL-1 without preconcentration steps and 0.08 ng mL-1 with solid phase extraction (SPE)), low-cost and possible to couple with separative methods for the simultaneous determination of other pesticides. The enhanced chemiluminescence intensity was linear with thiacloprid concentration over the (2-80) and (80-800) ng mL-1 ranges. A possible reaction mechanism is also discussed. The authors thank the Ministerio de Educacion y Ciencia of Spain and the Fondo Europeo de Desarrollo Regional for financial support, Project CTM2006-11991. |
| Databáze: | OpenAIRE |
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