| http://www.w3.org/ns/prov#value | - The subsoil in the Geul catchment consists of sand and shale and other studies also showed that total V concentrations in soils developed on shale are lower compared to more clay-rich substrates [41].Table 4: Summary statistics for total V concentrations (in mg???kg???1), based on Belgian (this study) and European [28] data.
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