Abstract
A spatially extensive geochemical data set of stream water and bed sediment composition across the Tamar catchment in south-west England was analysed to identify the key bed sediment properties that control the in-stream dissolved reactive phosphorus (DRP) concentrations during baseflow conditions. Linear regression analysis of the streamwater DRP concentrations and the distribution coefficient K d for DRP revealed that the former is positively correlated with total SiO2 and Al2O3, and negatively correlated with K2O. The primary control on these major element distributions is the dominant bedrock geology. The data suggest that streamwater DRP concentrations are mainly controlled by adsorption to clay minerals. Where P concentrations in streamwater were considerably elevated by inputs from point sources, DRP concentrations are also controlled by precipitation of hydroxyapatite.
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van der Perk, M., Owens, P.N., Deeks, L.K., Rawlins, B.G. (2006). Streambed Sediment Geochemical Controls on In-Stream Phosphorus Concentrations During Baseflow. In: Kronvang, B., Faganeli, J., Ogrinc, N. (eds) The Interactions Between Sediments and Water. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-5478-5_9
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DOI: https://doi.org/10.1007/978-1-4020-5478-5_9
Publisher Name: Springer, Dordrecht
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