What question did this study set out to answer?

Determine how bromide ion concentration and reaction pH influence the formation of polyhalogenated ethylphenoxyethylphenols (PXEPEPs), including predioxins, during aqueous chlorination of 4-ethylphenol.

May 1, 2009Journal of Environmental Science and Health Part A

Formation of polybrominated and polychlorinated ethylphenoxyethylphenols (PXEPEPs) during aqueous chlorination of 4-ethylphenol solutions in the presence of bromide ions

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Authors

TKTsuyoshi KawakamiNational Institute of Health Sciences INIwaki NishiKanagawa Prefectural Institute of Public Health TKTomohiro KishiSakai Municipal Hospital

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Implication

Experimental study reveals bromide ions shift halogenation toward brominated predioxins during 4-ethylphenol chlorination, highlighting water disinfection by-product risks.

Key Points

Determine how bromide ion concentration and reaction pH influence the formation of polyhalogenated ethylphenoxyethylphenols (PXEPEPs), including predioxins, during aqueous chlorination of 4-ethylphenol.
Treated aqueous solutions of 4-ethylphenol with hypochlorite across a gradient of bromide ion concentrations and varying pH conditions.
Extracted reaction products using hexane and analyzed product compositions with gas chromatography coupled to flame ionization detection and mass spectrometry.
Chlorination of 4-ethylphenol yielded multiple halogenated by-products with 0 to 4 halogen substituents, with bromine substitution occurring at bromide concentrations as low as 0.1 equivalents per mole of 4-ethylphenol.
Increasing bromide ion concentrations above 1 equivalent per mole increased the number of substituted bromine atoms while decreasing chlorine substitution on PXEPEPs.
Total ion chromatograms confirmed the formation of polybrominated and polychlorinated predioxins, which were eliminated at 10 equivalents of bromide ions per mole of 4-ethylphenol.

Cite This Study

Kawakami et al. (2009) studied this question.

synapsesocial.com/papers/6a90224ee73a4c404fc91fe4 https://doi.org/10.1080/10934520902847612

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Implication

Experimental study reveals bromide ions shift halogenation toward brominated predioxins during 4-ethylphenol chlorination, highlighting water disinfection by-product risks.

Formation of polybrominated and polychlorinated ethylphenoxyethylphenols (PXEPEPs) during aqueous chlorination of 4-ethylphenol solutions in the presence of bromide ions

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Implication

Key Points

Cite This Study

Formation of polybrominated and polychlorinated ethylphenoxyethylphenols (PXEPEPs) during aqueous chlorination of 4-ethylphenol solutions in the presence of bromide ions

Discussion

Member takes

Implication

Key Points

Cite This Study

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