Chlorination of oxybenzone

Kinetics, transformation, disinfection byproducts formation, and genotoxicity changes

Shujuan Zhang, Xiaomao Wang, Hongwei Yang, Yuefeng F. Xie

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

UV filters are a kind of emerging contaminant, and their transformation behavior in water treatment processes has aroused great concern. In particular, toxic products might be produced during reaction with disinfectants during the disinfection process. As one of the most widely used UV filters, oxybenzone has received significant attention, because its transformation and toxicity changes during chlorine oxidation are a concern. In our study, the reaction between oxybenzone and chlorine followed pseudo-first-order and second-order kinetics. Three transformation products were detected by LC-MS/MS, and the stability of products followed the order of tri-chloro-methoxyphenoyl > di-chlorinated oxybenzone > mono-chlorinated oxybenzone. Disinfection byproducts (DBPs) including chloroform, trichloroacetic acid, dichloroacetic acid and chloral hydrate were quickly formed, and increased at a slower rate until their concentrations remained constant. The maximum DBP/oxybenzone molar yields for the four compounds were 12.02%, 6.28%, 0.90% and 0.23%, respectively. SOS/umu genotoxicity test indicated that genotoxicity was highly elevated after chlorination, and genotoxicity showed a significantly positive correlation with the response of tri-chloro-methoxyphenoyl. Our results indicated that more genotoxic transformation products were produced in spite of the elimination of oxybenzone, posing potential threats to drinking water safety. This study shed light on the formation of DBPs and toxicity changes during the chlorination process of oxybenzone.

Original languageEnglish (US)
Pages (from-to)521-527
Number of pages7
JournalChemosphere
Volume154
DOIs
StatePublished - Jul 1 2016

Fingerprint

Disinfection
Chlorination
Halogenation
genotoxicity
chlorination
disinfection
Byproducts
kinetics
Kinetics
Chlorine
Toxicity
chlorine
Dichloroacetic acid
Trichloroacetic acid
toxicity
filter
Disinfectants
acid
Chlorine compounds
chloroform

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Environmental Chemistry
  • Chemistry(all)
  • Pollution
  • Health, Toxicology and Mutagenesis

Cite this

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abstract = "UV filters are a kind of emerging contaminant, and their transformation behavior in water treatment processes has aroused great concern. In particular, toxic products might be produced during reaction with disinfectants during the disinfection process. As one of the most widely used UV filters, oxybenzone has received significant attention, because its transformation and toxicity changes during chlorine oxidation are a concern. In our study, the reaction between oxybenzone and chlorine followed pseudo-first-order and second-order kinetics. Three transformation products were detected by LC-MS/MS, and the stability of products followed the order of tri-chloro-methoxyphenoyl > di-chlorinated oxybenzone > mono-chlorinated oxybenzone. Disinfection byproducts (DBPs) including chloroform, trichloroacetic acid, dichloroacetic acid and chloral hydrate were quickly formed, and increased at a slower rate until their concentrations remained constant. The maximum DBP/oxybenzone molar yields for the four compounds were 12.02{\%}, 6.28{\%}, 0.90{\%} and 0.23{\%}, respectively. SOS/umu genotoxicity test indicated that genotoxicity was highly elevated after chlorination, and genotoxicity showed a significantly positive correlation with the response of tri-chloro-methoxyphenoyl. Our results indicated that more genotoxic transformation products were produced in spite of the elimination of oxybenzone, posing potential threats to drinking water safety. This study shed light on the formation of DBPs and toxicity changes during the chlorination process of oxybenzone.",
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Chlorination of oxybenzone : Kinetics, transformation, disinfection byproducts formation, and genotoxicity changes. / Zhang, Shujuan; Wang, Xiaomao; Yang, Hongwei; Xie, Yuefeng F.

In: Chemosphere, Vol. 154, 01.07.2016, p. 521-527.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Chlorination of oxybenzone

T2 - Kinetics, transformation, disinfection byproducts formation, and genotoxicity changes

AU - Zhang, Shujuan

AU - Wang, Xiaomao

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AU - Xie, Yuefeng F.

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