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Simple determination of the herbicide napropamide in water and soil samples by room temperature phosphorescence

Authors

  • Alfonso Salinas-Castillo,

    1. Department of Analytical Chemistry, Faculty of Sciences, University of Granada, C/Fuentenueva s/n, 18071 Granada, Spain
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  • Jorge Fernando Fernández-Sanchez,

    1. Centre for Chemical Sensors, Swiss Federal Institute of Technology Zurich (ETHZ), Technoparkstrasse 1, CH-8005 Zürich, Switzerland
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  • Dr Antonio Segura-Carretero,

    Corresponding author
    1. Department of Analytical Chemistry, Faculty of Sciences, University of Granada, C/Fuentenueva s/n, 18071 Granada, Spain
    • Department of Analytical Chemistry, Faculty of Sciences, University of Granada, C/Fuentenueva s/n, 18071 Granada, Spain
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  • Alberto Fernández-Gutiérrez

    1. Department of Analytical Chemistry, Faculty of Sciences, University of Granada, C/Fuentenueva s/n, 18071 Granada, Spain
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Abstract

A new, simple, rapid and selective phosphorimetric method for determining napropamide is proposed which demonstrates the applicability of heavy-atom-induced room-temperature phosphorescence for analyzing pesticides in real samples. The phosphorescence signals are a consequence of intermolecular protection and are found exclusively with analytes in the presence of heavy atom salts. Sodium sulfite was used as an oxygen scavenger to minimize room-temperature phosphorescence quenching. The determination was performed in 1 M potassium iodide and 6 mM sodium sulfite at 20 °C. The phosphorescence intensity was measured at 520 nm with excitation at 290 nm. Phosphorescence was easily developed, with a linear relation to concentration between 3.2 and 600.0 ng ml−1 and a detection limit of 3.2 ng ml−1. The method has been successfully applied to the analysis of napropamide in water and soil samples and an exhaustive interference study was also carried out to display the selectivity of the proposed method. Copyright © 2005 Society of Chemical Industry

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