164-1 Equilibrium Phosphorus Concentrations and Phosphorus Forms of Sediments in Walnut Creek, Iowa.

Poster Number 1611

See more from this Division: SSSA Division: Soils & Environmental Quality
See more from this Session: Tracking Legacy Phosphorus in Lakes and Rivers - II

Monday, November 16, 2015
Minneapolis Convention Center, Exhibit Hall BC

Suroso Rahutomo, Indonesian Oil Palm Research Institute, Medan, Indonesia, John L. Kovar, 1015 North University Blvd., USDA-ARS National Laboratory for Agriculture and the Environment, Ames, IA and Michael L. Thompson, Agronomy Department, Iowa State University, Ames, IA
Poster Presentation
  • 1611.pdf (1.7 MB)
  • Abstract:
    To determine how adsorption processes regulate phosphorus (P) mobility in stream water and to characterize the composition of P sorbents in the sediments, isotherm adsorption experiments and a P fractionation were conducted for 12 sediment samples from the Walnut Creek watershed, Iowa. We learned from adsorption experiments that lowering redox potential as well as increasing shaking energy resulted in higher value of Equilibrium P Concentration (EPC). The higher the EPC value, the more likely stream sediments can act as a P source by favoring phosphate desorption into stream water. The P fractionation study indicated that the distribution of P among different organic and inorganic solid phases varied among the stream sediments.

    See more from this Division: SSSA Division: Soils & Environmental Quality
    See more from this Session: Tracking Legacy Phosphorus in Lakes and Rivers - II

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