TITLE

The photochemical behaviour of five household pyrethroid insecticides and a synergist as studied by photo-solid-phase microextraction

AUTHOR(S)
Fernández-Álvarez, M.; Lores, M.; Llompart, M.; García-Jares, C.; Cela, R.
PUB. DATE
July 2007
SOURCE
Analytical & Bioanalytical Chemistry;Jul2007, Vol. 388 Issue 5/6, p1235
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
In the present study, solid-phase microextraction in photochemical studies was used to investigate UV light induced photodegradation of five pyrethroids (empenthrin, transfluthrin, allethrin, phenothrin and cyphenothrin) and a synergist (piperonyl butoxide), which are common ingredients of household insecticides. Gas chromatography coupled with mass spectrometry was used to separate and tentatively identify the parent compounds and their corresponding photoproducts generated in the same polydimethylsiloxane fibre. Kinetics curves were obtained and apparent first-order rate constants and half-lives were estimated. Twenty-six photoproducts were tentatively identified and photodegradation pathways for the compounds investigated were proposed. It is a matter of some concern that three of the photoproducts identified [(3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylic acid, 3-phenoxybenzaldehyde and (3-phenoxyphenyl)methanol] have been reported to be endocrine disruptors. There is no record of previous studies of cyphenothrin and empenthrin photodegradation, and therefore the present study represents the first attempt to elucidate the photochemical behaviour of these compounds. [Figure not available: see fulltext.]
ACCESSION #
25603372

 

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