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首页> 外文期刊>Environmental Science & Technology: ES&T >Bromine Radical (Br(center dot)and Br-2(center dot-)) Reactivity with Dissolved OrganicMatter and Brominated Organic Byproduct Formation
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Bromine Radical (Br(center dot)and Br-2(center dot-)) Reactivity with Dissolved OrganicMatter and Brominated Organic Byproduct Formation

机译：Bromine Radical (Br(center dot)and Br-2(center dot-)) Reactivity with Dissolved OrganicMatter and Brominated Organic Byproduct Formation

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摘要

Dissolved organic matter (DOM) is a majorscavenger of bromine radicals (e.g., Br center dot and Br2 center dot-) in sunlitsurface waters and during oxidative processes used in watertreatment. However, the literature lacks quantitative measurementsof reaction rate constants between bromine radicals and DOM andlacks information on the extent to which these reactions formbrominated organic byproducts. Based on transient kinetic analysiswith different fractions and sources of DOM, we determinedreaction rate constants for DOM with Br center dot ranging from <5.0x107to (4.2 +/- 1.3)x108MC-1s-1, which are comparable with those ofHO center dot but higher than those with Br2 center dot-(k= (9.0 +/- 2.0)x104to(12.4 +/- 2.1)x105MC-1s-1). Br center dot and Br2 center dot-attack the aromaticand antioxidant moieties of DOM via the electron transfer mechanism, resulting in Br-release with minimal substitution of bromineinto DOM. For example, the total organic bromine was less than 0.25 mu M (as Br) at environmentally relevant bromine radicals'exposures of similar to 10-9Mmiddots. The results give robust evidence that the scavenging of bromine radicals by DOM is a crucial step toprevent inorganic bromine radical chemistry from producing free bromine (HOBr/OBr-) and subsequent brominated byproducts.

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