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Investigation of the photochemical behaviour of pyrethroids lacking the cyclopropane ring by photo‐solid‐phase microextraction and gas chromatography/mass spectrometry
Author(s) -
FernandezAlvarez Maria,
Llompart Maria,
GarciaJares Carmen,
Dagnac Thierry,
Lores Marta
Publication year - 2009
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/rcm.4301
Subject(s) - chemistry , photodegradation , mass spectrometry , solid phase microextraction , chromatography , mass spectrum , photochemistry , cyclopropane , gas chromatography–mass spectrometry , analytical chemistry (journal) , ring (chemistry) , organic chemistry , catalysis , photocatalysis
Abstract The characterization of by‐products arising from the UV photodegradation of two insecticide pyrethroids lacking the cyclopropane ring (flucythrinate and fenvalerate) has been investigated by gas chromatography coupled with mass spectrometry (GC/MS). Twenty photoproducts were tentatively identified mainly based on the interpretation of the experimental mass spectra or by using reference mass spectra. Some of these compounds had not previously been detected. Furthermore, the generation of some of the photoproducts might be a matter for concern due to their potential toxicity. The corresponding photodegradation routes, including postulation of the intermediate radicals, have also been proposed. These photodegradation studies were performed by photo‐solid‐phase microextraction (photo‐SPME) in which the SPME fibre was exposed to light after extraction of the target analytes from aqueous solutions. The degradation kinetics of the investigated pyrethroids and the photoformation‐photodegradation curves of the photoproducts generated in situ were also monitored through the ion chromatograms obtained for different irradiation times and the corresponding mass spectra. Copyright © 2009 John Wiley & Sons, Ltd.