A.J.M. Santos, J. E. D. Esteves da Silva
Feb 1, 2019
Citations
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Influential Citations
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Journal
Environmental Technology & Innovation
Abstract
Abstract 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.