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• W3177130783 endingPage "131253" @default.
• W3177130783 startingPage "131253" @default.
• W3177130783 abstract "Haloacetaldehydes (HALs) are the third prevalent group of disinfection by-products (DBPs) by weight in drinking water, and their cytotoxicity and genotoxicity are higher than regulated DBPs. In order to understand their formation mechanism during chlorination and ozonation-chlorination, this study examined the reaction kinetics of chloral hydrate (CH), dichloroacetaldehyde (DCA), chloroacetaldehyde (CA) and acetaldehyde by chlorine at different pH values and chlorine doses. The results showed that the reaction rate constants increased with pH and chlorine dose, except that the degradation of CH would not be affected by the presence of free chlorine. At the same pH and chlorine dose, the half-lives of CH, DCA, CA and acetaldehyde were in the order of CH > acetaldehyde ≫ DCA > CA. A kinetic model used to predict the formation of HALs and chloroform during chlorination of acetaldehyde was developed, and the predicted data fitted well with the measured data. As pre-ozonation could oxidize natural organic matter to acetaldehydes, the concentration of acetaldehyde formed after pre-ozonation was used to calculate the HAL yields during ozonation-chlorination by the kinetic model, which fitted the experimental results well. The kinetic model elucidated that the formation mechanism of HALs was a stepwise substitution process on the α-hydrogen of acetaldehyde during chlorination." @default.
• W3177130783 created "2021-07-05" @default.
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• W3177130783 date "2021-11-01" @default.
• W3177130783 modified "2023-10-18" @default.
• W3177130783 title "Kinetics and mechanism of haloacetaldehyde formation from the reaction of acetaldehyde and chlorine" @default.
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• W3177130783 doi "https://doi.org/10.1016/j.chemosphere.2021.131253" @default.
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