The occurrence of the herbicide dalapon (2,2-dichloropropionate) in potable water as a disinfection by-product
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Salts of 2,2-dichloropropionic acid, such as dalapon, are well known as herbicides and are regulated as such in potable water in Australia and elsewhere. It is also an identified disinfection by-product (DBP), but little is known about the compound's formation and typical levels from this source. This work presents results from a sampling campaign where 2,2-dichloropropionate was found at levels between 0.1 and 0.5 姠l-1 in potable water samples from a major treatment plant in South East Queensland, Australia. However, levels were below the reporting limit (0.01 姠l-1) in the immediate source water for the plant. Also, temporal trends in 2,2-dichloropropionate observed in treated water during sampling mirrored those of trihalomethanes albeit at much lower concentrations, suggesting that the occurrence is due to in situ formation as a DBP. This could present a regulatory dilemma in some jurisdictions.
Journal of Environmental Monitoring
© 2011 Royal Society of Chemistry. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal website for access to the definitive, published version.
Environmental Chemistry (incl. Atmospheric Chemistry)