TITLE

Further research on the photo-SPME of triclosan

AUTHOR(S)
Sánchez-Prado, Lucia; Llompart, Maria; Lores, Marta; Fernández-Álvarez, Maria; García-Jares, Carmen; Cela, Rafael
PUB. DATE
April 2006
SOURCE
Analytical & Bioanalytical Chemistry;Apr2006, Vol. 384 Issue 7/8, p1548
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
In this study the photoinduced degradation of triclosan has been investigated by photo-solid-phase microextraction (photo-SPME). In photo-SPME, photodegradation is carried out on the SPME fibre containing the target compound. Triclosan was extracted from aqueous solutions by use of polydimethylsiloxane SPME fibres and these were subsequently exposed to UV irradiation (power 8 W, wavelength 254 nm) for different times (from 2 to 60 min). The photodegradation kinetics of triclosan were investigated, the photoproducts generated were tentatively identified, and the photochemical behaviour of these products was studied by use of this on-fibre approach followed by gas chromatographic–mass spectrometric analysis. Eight photoproducts were tentatively identified, including chlorinated phenols, chlorohydroxydiphenyl ethers, 2,8-dichlorodibenzo- p-dioxin, and a possible dichlorodibenzodioxin isomer or dichlorohydroxydibenzofuran. The main photodegradation mechanisms were postulated and photodegradation pathways proposed. The effect of pH on triclosan degradation and on triclosan-to-dioxin conversion was also investigated. Triclosan degradation occurred, and generation of 2,8-dichlorodibenzo- p-dioxin was confirmed, throughout the pH range studied (from 3 to 9). [Figure not available: see fulltext.]
ACCESSION #
20329998

 

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