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Precursors of nitrogenous disinfection by-products in drinking water - a critical review and analysis

Bond, T, Templeton, MR and Graham, N (2012) Precursors of nitrogenous disinfection by-products in drinking water - a critical review and analysis Journal of Hazardous Materials, 235-23. pp. 1-16.

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In recent years research into the formation of nitrogenous disinfection by-products (N-DBPs) in drinking water – including N-nitrosodimethylamine (NDMA), the haloacetonitriles (HANs), haloacetamides (HAcAms), cyanogen halides (CNX) and halonitromethanes (HNMs) – has proliferated. This is partly due to their high reported toxicity of N-DBPs. In this review paper information about the formation yields of N-DBPs from model precursors, and about environmental precursor occurrence, has been employed to assess the amount of N-DBP formation that is attributable to known precursors. It was calculated that for HANs and HAcAms, the concentrations of known precursors – mainly free amino acids are insufficient to account for the observed concentrations of these N-DBP groups. However, at least in some waters, a significant proportion of CNX and NDMA formation can be explained by known precursors. Identified N-DBP precursors tend to be of low molecular weight and low electrostatic charge relative to bulk natural organic matter (NOM). This makes them recalcitrant to removal by water treatment processes, notably coagulation, as confirmed by a number of bench-scale studies. However, amino acids have been found to be easier to remove during water treatment than would be suggested by the known molecular properties of the individual free amino acids.

Item Type: Article
Subjects : Civil Engineering
Divisions : Surrey research (other units)
Authors :
Templeton, MR
Graham, N
Date : 15 October 2012
DOI : 10.1016/j.jhazmat.2012.07.017
Copyright Disclaimer : © 2012 Elsevier B.V. All rights reserved.
Uncontrolled Keywords : Haloacetonitriles, Haloacetamides, Nitrosamines, Halonitromethanes, Cyanogen halides
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 13:57
Last Modified : 25 Jan 2020 00:34

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