Development of a concept for the selection of priority substances that are relevant to water supply (hot target analysis)

Substances are derived from a population of water-relevant substances that are presumed to be of relevance to drinking water

The ever-increasing number of findings of organic substances (micropollutants) in surface water needs targeted prioritisation and selection of those substances that are relevant to water supply and potentially problematic. This was the aim of this research project.

The ever-increasing number of findings of organic substances in groundwater and surface water needs targeted prioritisation and selection of those substances that are relevant to water supply and potentially problematic. In the presented research project, using intrinsic substance properties, water-supply-specific criteria and removability in natural and technical systems were considered, along with the contamination sources in water and preferred application/use.

The developed methodology is a two-stage process: The first step is to screen using modelled physicochemical data and toxicological derivations. This equates to a worst-case scenario in which the only known information on the potential raw water contamination is the chemical identity (i.e. the structure) of the compound. This approach is chosen based on the fact that the high rate of substance development and the analytical evidence of “new” substances in drinking water resources means that the official assessment of these substances in terms of relevance to drinking water cannot compete with the speed of its detection and the situation in terms of experimental data is often poor. For those substances identified as problematic, which cannot be addressed using the selected risk management measures (i.e. activated carbon treatment and ozonation), once screening – if available – is complete, the list of substances is refined using experimental data on their environmental performance. This also takes into account information on application quantities and substance contamination scenarios. The detailed results can be found in the final report.

 

Publications:

Nödler K.; Happel O.; Scheurer M.; Storck F. R.; Brauch H.-J.: Selektion von für die Wasserversorgung relevanten prioritären Stoffen und Erarbeitung einer Stoffliste [Selection of priority substances relevant to water supply and creation of a substance list] (2018)

Schaffer M.; Kutzner S.; Börnick H.; Nödler K.; Worch E.; Licha T.: Charakterisierung der Sorption organischer Basen aus wässrigen Lösungen: Aktuelle Ergebnisse und Limitierungen bei der Prognose des Umweltverhaltens [Characterisation of the sorption of organic bases from aqueous solutions: latest results and limits when predicting environmental performance]. Mitteilungen der Fachgruppe Umweltchemie und Ökotoxikologie der GDCh, 22nd year 2016/ No.3, 67–70. (2016)

 

 

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