Natural nickel background values of monitoring stations in the upper confined water bodies of the Apennine and Po Valley floodplains — Reference period (1987-2018) — Edition March 2020 The natural background values of chemicals present in groundwater represent the concentration of a substance or the value of an indicator in an underground water body corresponding to the absence of anthropogenic alterations or the presence of extremely limited alterations compared to naltered conditions — (Directive 2006/118/EC).
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