Arsenic background values in groundwater in Lower Saxony 1 : 500,000

Description

Background values for dissolved arsenic in groundwater were determined for the hydrogeological subregions of Lower Saxony (Elbracht et al., 2016) in order to fulfil the tasks of the EC Water Framework Directive (EC Water Framework Directive) and the Groundwater Ordinance (GrwV). The background values of dissolved arsenic include the levels that occur under natural conditions due to the contact of the groundwater with the surrounding rock matrix of the aquifer. The map shows the arsenic background values of the hydrogeological subregions of Lower Saxony in different colours. The classification is based on the applicable de minimis thresholds (JRC) of the Länderarbeitsgemeinschaft Wasser (LAWA), the limit values of the Drinking Water Ordinance (TrinkwV) and the guidelines of the World Health Organization (WHO). Selecting a subspace leads to further information (e.g. number of samples, summarized subspaces, etc.). Background values are not current measurements of groundwater quality and cannot be used as such! Information on the data: The groundwater analyses used come from the database of the Lower Saxony Soil Information System (NIBIS). Background values are defined as the 90th percentile of the normal population of the geogenous concentration of the analyzed parameter. The most up-to-date analysis of a groundwater measuring point was used to determine the background values, but no measurements dating before the year 2000 were used. If the number of samples (n < 10) was too small, lithologically similar subspaces were combined to form a common background value where possible. The determination of the background values followed the procedure for statistical evaluation of the data by means of the probability network of the State Geological Services (Wagner et al., 2011). Sources: ELBRACHT, J., MEYER, R. & REUTTER, E. (2016): Hydrogeological spaces and subspaces in Lower Saxony. – GeoBerichte 3, LBEG, Hannover. DOI: 10.48476/geober_3_2016 WAGNER, B., WALTER, T., HIMMELSBACH, T., CLOS, P., BEER, A., BUDZIAK, D., DREHER, T., FRITSCHE, H.-G., HÜBSCHMANN, M., MARCZINEK, S., PETERS, A., POESER, H., SCHUSTER, H., STEINEL, A., WAGNER, F. & WIRSING, G. (2011): Hydrogeochemical Background values of groundwaters in Germany as a web map service. – Groundwater 16(3): 155-162; Springer, Berlin / Heidelberg. www.springerlink.com/content/e88pm153254q4u52

Resources

Name Format Description Link
0 https://nibis.lbeg.de/net3/public/ogc.ashx?NodeId=1363&Service=WMS&Request=GetCapabilities&

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  • opendata
  • inspireidentifiziert
  • nibis-metadaten
  • sgd_hydrogeologie

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