Issue 2, 2011

The occurrence of the herbicide dalapon (2,2-dichloropropionate) in potable water as a disinfection by-product

Abstract

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 µg 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 µg 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.

Graphical abstract: The occurrence of the herbicide dalapon (2,2-dichloropropionate) in potable water as a disinfection by-product

Supplementary files

Article information

Article type
Communication
Submitted
06 Sep 2010
Accepted
23 Nov 2010
First published
17 Dec 2010

J. Environ. Monit., 2011,13, 252-256

The occurrence of the herbicide dalapon (2,2-dichloropropionate) in potable water as a disinfection by-product

D. W. Hawker, J. L. Cumming, A. Watkinson and M. E. Bartkow, J. Environ. Monit., 2011, 13, 252 DOI: 10.1039/C0EM00475H

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