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Potential of the luminol reaction in the sensitive detection of pesticide residues by flow injection analysis

✍ Scribed by José Fernando Huertas-Pérez; Ana M. García-Campaña; Antonio González-Casado; Laura Gámiz-Gracia

Publisher
John Wiley and Sons
Year
2004
Tongue
English
Weight
77 KB
Volume
19
Category
Article
ISSN
1522-7235

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✦ Synopsis

Abstract

This study presents the first analytical application of the luminol chemiluminescence (CL) reaction for the sensitive detection of carbamate residues. Some experiments have been carried out to check the influence of the presence of traces of a N‐methylcarbamate (carbaryl) on the CL emission produced from the oxidation of luminol using different oxidants, showing a significant enhancing effect on the CL emission when the oxidation of luminol is produced by potassium permanganate in alkaline medium, this enhancement being proportional to the carbaryl concentration. This fact has permitted the establishment of a sensitive chemiluminescence flow‐injection (CL‐FIA) method for the direct determination of carbaryl. The optimization of instrumental and chemical variables influencing the CL response has been carried out by applying experimental designs. Under the optimal conditions, the CL intensity was linear for a carbaryl concentration over the range 5–100 ng/mL with a detection limit of 4.9 ng/mL. This luminol–KMnO~4~‐based FIA‐CL system in basic medium shows an easy, fast and cheap alternative detection mode for the analysis of carbaryl residues in environmental water samples. Copyright © 2004 John Wiley & Sons, Ltd.

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