Degradation of UV filters 2-ethylhexyl-4-methoxycinnamate and 4-tert-butyl-4 '-methoxydibenzoylmethane in chlorinated water

• Type: Article in International Scientific Journal
• Date: 2013

Authors

Joel J M Santos (Author) Other; Diana M A Crista (Author) Other; Margarida S Miranda (Author) FCUP; Isabel F Almeida (Author) FFUP; Jose P S E Sousa e Silva (Author) FFUP; Paulo C Costa (Author) FFUP; Maria H Amaral (Author) FFUP; Paulo A L Lobao (Author) FFUP; Jose Sousa S Lobo (Author) Other; Joaquim Esteves G E da Silva (Author) FCUP

Journal

Title: Environmental Chemistry

Vol. 10

Pages: 127-134

ISSN: 1448-2517

Publisher: CSIRO Publishing

Indexing

ISI Web of Knowledge - 34 Citations

Scopus - 34 Citations

Scientific classification

FOS: Natural sciences > Chemical sciences

Other information

Authenticus ID: P-005-39P

DOI: 10.1071/en13012

Abstract (EN): The stability of the UV filters 2-ethylhexyl-4-methoxycinnamate (EHMC) and 4-tert-butyl-4'-methoxydibenzoylmethane (BDM) in chlorinated water was studied. High-performance liquid chromatography (HPLC)-UV-diode array detection (DAD) was used to follow the reaction kinetics of both UV filters and HPLC-tandem mass spectrometry (MS/MS) was used to tentatively identify the major transformation by-products. Under the experimental conditions used in this work both UV filters reacted with chlorine following pseudo-first order kinetics: rate constant k = 0.0095 +/- 0.0007 min(-1) and half-life t(1/2) = 73 +/- 4 min for EHMC and rate constant k = 0.006 +/- 0.001 min(-1) and half-life t(1/2) = 119 +/- 14 min for BDM (mean +/- standard deviation). The chemical transformation of the UV filters in chlorinated water led to the formation of chlorinated by-products that were tentatively identified as mono- and dichloro-substituted compounds that resulted from substitution of the hydrogen atoms in the benzene rings by one or two chlorine atoms. Experimental Box-Behnken designs were used to assess the effect of experimental factors: pH, temperature, chlorine concentration, dissolved organic matter and artificial sunlight irradiation on the transformation of the UV filters.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 8