Environmental fate and behaviour of benzophenone-8 in aqueous solution

• Tipo: Artigo em Revista Científica Internacional
• Data: 2019

Autores

Santos, AJM (Autor) Outra; Joaquim C G E Esteves da Silva (Autor) FCUP

Revista

A Revista está pendente de validação pelos Serviços Administrativos.

Título: ENVIRONMENTAL TECHNOLOGY & INNOVATION

Vol. 13

Páginas: 48-61

ISSN: 2352-1864

Indexação

ISI Web of Knowledge - 3 Citações

Scopus - 4 Citações

Outras Informações

ID Authenticus: P-00P-WHX

DOI: 10.1016/j.eti.2018.10.010

Abstract (EN): The fate and behaviour of 2-hydroxy-4-methoxyphenyl)-(2-hydroxyphenyl)-methanone, ordinarily known as benzophenone-8 (BP8), in aqueous solution, is thoroughly addressed in this study. The reactions were followed by means of high-performance liquid chromatography coupled with ultraviolet, diode-array detection (HPLC-UV-DAD). Potential by-products of degradation were analysed and determined by liquid chromatography coupled with diode-array detection and mass spectrometry (LC-DAD-MS). BP8 displayed very significant reactivity towards free available chlorine, following a pseudo-first order kinetic profile with rate constant k(obs) = 0.0036 +/- 0.0002 s(-1) and a half-life period of t(1/2) = 194.12 +/- 7.90 s. Disinfection-induced degradation yielded only monochlorinated and dichlorinated disinfection by-products (DBPs). With or without dissolved organic matter (DOM) in solution, the pH and chlorine concentration were the only influential variables on degradation. Photo-induced degradation was assessed by means of exposure to artificial solar radiation. The compound proved to be extremely photo-stable, with a kinetic rate constant of k = 0.00083 +/- 0.00002 min(-1) and a half-life period of t(1/2) = 835.12 +/- 20.12 min. Exposure to artificial solar radiation did not generate any meaningful alterations in the UV spectrum of BP8. There are indications of the possible formation of a photo-isomer, but its extremely low significance and intensity, even after pre-concentration, deemed it negligible.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 14