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<p>The sediment equilibrium phosphorus concentration (EPC<sub>0</sub>) is used to estimate phosphorus (P) flux at the sediment-water interface. This parameter is most commonly measured by the batch method which potentially disrupts natural sediment structure at sampling. This manuscript describes the use of a dynamic mesocosm system consisting of sediment cores modified to recirculate overlying waters from the cores through an external reservoir that is subject to experimental manipulation. The method allows EPC<sub>0</sub> to be determined on intact cores while preserving in-situ sediment structure. Calibration of the system demonstrated time to steady state after P-spiking to vary by spike concentration and temperature. Comparisons between EPC<sub>0</sub> from batch and mesocosms revealed higher EPC<sub>0</sub> in cores compared to batch methods. When sediment structure was disrupted by homogenization, technique differences were reduced.</p>

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Sediment Phosphorus Equilibrium Concentration (EPC0) Measured Using a Novel Dynamic Mesocosm System

  • 期刊论文

  • 发表日期：

    2025年7月11日

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  • Tilak Patel,
  • Chris Weisener,
  • Ken G. Drouillard

摘要

The sediment equilibrium phosphorus concentration (EPC0) is used to estimate phosphorus (P) flux at the sediment-water interface. This parameter is most commonly measured by the batch method which potentially disrupts natural sediment structure at sampling. This manuscript describes the use of a dynamic mesocosm system consisting of sediment cores modified to recirculate overlying waters from the cores through an external reservoir that is subject to experimental manipulation. The method allows EPC0 to be determined on intact cores while preserving in-situ sediment structure. Calibration of the system demonstrated time to steady state after P-spiking to vary by spike concentration and temperature. Comparisons between EPC0 from batch and mesocosms revealed higher EPC0 in cores compared to batch methods. When sediment structure was disrupted by homogenization, technique differences were reduced.