Cadmium background values in groundwater of Lower Saxony 1: 500.000

In order to fulfil the tasks of the EC Water Framework Directive (EC-WRRL) and the Groundwater Ordinance (GrwV), background values for dissolved cadmium in groundwater were determined for the hydrogeological sub-areas of Lower Saxony. The background values of dissolved cadmium 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 color-differentiated cadmium background values (90th percentile) of the different subspaces. The classification is based on the valid de minimis thresholds (JFS) of the State Working Group on Water (LAWA), the limit values of the Drinking Water Ordinance (TrinkwV) and the guidelines of the World Health Organisation (WHO). By selecting a subspace you get further information (e.g. number of samples, etc.). Detailed information on cadmium in the groundwater of Lower Saxony can be found in GeoReport 41. Background values are not current measurements of groundwater quality and cannot be used as such! Information about the data: The collected data are the subject of a research project of the University of Bremen, Department of Geosciences, Department of Geochemistry and Hydrogeology (Kubier 2019a), which was initiated as a measure under EC-WRRL (MU 2015). The research project was carried out in cooperation with the LBEG, the project was funded by the Lower Saxony State Agency for Water Management, Coastal and Nature Conservation (NLWKN) with funding from the state of Lower Saxony from the field of groundwater. A final report with extensive documentation (Kubier 2019b) has been prepared for the research project, which forms the basis for GeoReport 41. The groundwater analyses used come from the state measuring networks of Lower Saxony and Bremen. Sources: Kubier, A. (2019a): Occurrence, reaction and transport behaviour of cadmium in groundwater. Dissertation, University of Bremen. — 125 S., Bremen. http://nbn-resolving.de/urn:nbn:de:gbv:46-00107497-17. Kubier, A. (2019b): Cadmium in the groundwater of Lower Saxony – Final report. Research project University of Bremen 62170-11-02/CD A31: 88 P.; Bremen [Unpublished]. MU – LOWER SAXONY MINISTRY OF ENVIRONMENT, ENERGY AND CLIMATE ACTION (2015): Contribution from Lower Saxony to the 2015-2021 action programmes of the Elbe, Weser, Ems and Rhine river basins. — 303 S., Hannover.A为满足欧盟水框架指令（EC Water Framework Directive，EC-WRRL）与《地下水条例》（Groundwater Ordinance，GrwV）的任务要求，研究针对下萨克森州的水文地质子区域，测定了地下水中溶解性镉的背景值。溶解性镉的背景值涵盖了因地下水与含水层围岩接触而在自然条件下形成的含量水平。本地图展示了不同子区域经颜色区分的镉背景值（90百分位数），其分类依据为州水工作组（Landesarbeitsgemeinschaft Wasser，LAWA）的有效微量阈值（JFS）、《饮用水条例》（Drinking Water Ordinance，TrinkwV）中的限值以及世界卫生组织（WHO）的指导标准。点击任一子区域即可获取更多相关信息（如采样数量等）。关于下萨克森州地下水中镉的详细资料，可参阅《GeoReport 41》。 背景值并非当前地下水水质的实测数据，不可直接用作水质判定依据！ ### 数据说明 本次收集的数据源自不莱梅大学地球科学学院地球化学与水文地质系的一项研究项目（Kubier 2019a），该项目作为EC-WRRL框架下的一项措施于2015年启动（MU 2015）。本项目与LBEG合作开展，由下萨克森州水管理、海岸与自然保护局（Niedersächsisches Landesamt für Wasserwirtschaft, Küste und Naturschutz，NLWKN）资助，资金来源于下萨克森州地下水专项经费。本项目已完成一份包含详尽文档的最终报告（Kubier 2019b），该报告即为《GeoReport 41》的编制基础。本次所用的地下水分析数据源自下萨克森州与不来梅州的官方监测网络。 ### 参考文献 1. Kubier, A. (2019a)：《地下水中镉的赋存、反应与运移行为》，不莱梅大学博士学位论文，共125页，不莱梅。http://nbn-resolving.de/urn:nbn:de:gbv:46-00107497-17。 2. Kubier, A. (2019b)：《下萨克森州地下水中的镉——最终研究报告》，不莱梅大学研究项目编号62170-11-02/CD A31，共88页，不莱梅[未公开出版]。 3. MU——下萨克森州环境、能源与气候部（2015)：《下萨克森州提交的易北河、威悉河、埃姆斯河与莱茵河流域2015-2021年行动方案贡献文件》，共303页，汉诺威。