Phosphate Adsorption-Desorption Characteristics of Suspended Sediments in the Maumee River Basin of Ohio1
- Dan B. Green,
- Terry J. Logan and
- Neil E. Smeck2
Phosphorus (P) adsorption-desorption characteristics of Maumee River Basin suspended sediments were compared with those of Basin soils and stream bottom sediments. Suspended sediment contained more total P than either soils or bottom sediments. The increase in total P over soils is attributed to enrichment of P in sediment by selective erosion of fine particles and adsorption of P during fluvial transport. The suspended sediment had higher adsorption maxima than Basin soils but lower than bottom sediments and had lower adsorption energies than either soils or bottom sediments. Calcite content of the suspended sediments was positively correlated with total P, EPC (equilibrium P concentration) and P desorbed and negatively correlated with adsorption energy, implying that, although calcite is a sink for P, the adsorption is weak compared with other sites for P adsorption such as hydrous oxides of Fe and Al.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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