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Updated: Jul 1, 2026

Measuring Phosphorus Release in Laboratory Microcosms for Water Quality Assessment
Published on: July 22, 2019
Interactions of land use and dynamic river conditions on sorption equilibria between benthic sediments and river
1The Macaulay Institute, Craigiebuckler, Aberdeen, AB15 8QH, UK. m.stutter@macaulay.ac.uk
Abstract:
Within-river cycling of P is a crucial link between catchment pollution sources and the resulting ecological impacts and integrates the biogeochemistry and hydrodynamics of river systems. This study investigates benthic sediment P sorption in relation to river soluble reactive phosphorus (SRP) concentrations during high- to low-flow changes in a major mixed land use river system in NE Scotland. We hypothesised that sediments comprised P sinks during moderate to higher flows but became P saturated with loss of buffering function during prolonged baseflow. Sediment characteristics were evaluated and equilibrium P concentrations (EPC(0)) calculated using a standardised batch adsorption method (EPC(0) values 0.04-1.75 micromol Pl(-1)). Pollution-impacted tributaries (32-69% catchment agricultural land cover) had increased SRP concentrations (0.19-2.62 micromol Pl(-1)) and maintained EPC(0)
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