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Mouly D.,Institute of Veille Sanitaire | Joulin E.,Laboratoire Detudes Et Of Recherche En Hydrologie | Rosin C.,Laboratoire Detudes Et Of Recherche En Hydrologie | Beaudeau P.,Institute of Veille Sanitaire | And 3 more authors.
Techniques - Sciences - Methodes | Year: 2010

Epidemiological studies have underlined an association between disinfection by-products in drinking water and some cancers in humans. However, we can not conclude for a dose-response relationship because of a lack of consistency between studies. Uncertainties related to exposure assessment, which is difficult by the number of routes of exposure involved and changes in concentrations in drinking water network, are partly responsible. The study presented in this report describes the evolution of three categories of disinfection by-products (trihalomethanes, haloacetic acids and haloacetonitriles), observed in four French drinking water systems in 2006 and 2007. For trihalomethanes, whose concentrations are doubling between treatment plant and tap water of consumers, a model for predicting concentrations in the drinking water system was developed. The five variables are the concentration of trihalomethanes and free residual chlorine out of treatment plant; two variables indicating the reactivity of organic matter; the hydraulic residence time in the drinking water network. The French legislation imposes a limit value for trihalomethanes in drinking water and the majority of measures are sampled out from treatment plants. Applied to these measures, the model developed could improve the population exposure surveillance.

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