Geochemistry of some rare earth elements in groundwater, Vierlingsbeek, the Netherlands
De geochemie van enkele zeldzame aarden in grondwater, Vierlingsbeek, Nederland
09 July 2013, PDF |
29 pages |
Janssen RPT, Verweij W, Versteegh JFM
RIVM Report 734301014
Speciation calculations were carried out on groundwater samples to shed more light on the chemical processes of rare earth elements (REE). These samples were taken from seven boreholes at several depths near the drinking water pumping station, Vierlingsbeek, The Netherlands. Complexation and precipitation reactions including inorganic and dissolved organic carbon (DOC) compounds, were taken into account. The REE speciation showed REE3+, REE(SO4)+, REE(CO3)+ and REE(DOC) to be the major species. Dissolution of REE-enriched solid phases probably does not account for the observed REEs in groundwater. This may be due to desorption of REEs on metal hydroxides. Multiple linear regression showed pH to be by far the most significant groundwater characteristic contributing to the variation in REE concentrations. Regression equations including only pH were derived to predict REE concentrations in groundwater.