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

• Tipo: Artigo em Revista Científica Internacional
• Data: 2013

Autores

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

Revista

Título: Environmental Chemistry

Vol. 10

Páginas: 127-134

ISSN: 1448-2517

Editora: CSIRO Publishing

Indexação

ISI Web of Knowledge - 34 Citações

Scopus - 34 Citações

Classificação Científica

FOS: Ciências exactas e naturais > Química

Outras Informações

ID Authenticus: 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.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 8