JEQ Journal of Natural Resources and Life Sciences Education
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Published in J Environ Qual 7:208-212 (1978)
© 1978 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Phosphate Adsorption-Desorption Characteristics of Suspended Sediments in the Maumee River Basin of Ohio1

Dan B. Green, Terry J. Logan and Neil E. Smeck2

ABSTRACT

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.

Key Words: eutrophication • pollution • runoff • Langmuir adsorption isotherm • algae • calcite

NOTES

1 Contribution from the Dep. of Agron., Ohio Agric. Res. and Dev. Center, Wooster, and Ohio State Univ., Columbus. This research was supported by a grant from USEPA and constitutes part of the PLUARG research program.

2 Research Associate and Associate Professors, respectively, Dep. of Agron.

Received for publication July 23, 1977.




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The SCI Journals Agronomy Journal Crop Science
Journal of Natural Resources
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Copyright © 1978 by the American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America.