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OLS Field Name OLS Field Data
Main Title Arsenic Sedimentation Along the Slope of a Lake Basin.
Author Siami, M. ; McNabb, C. D. ; Batterson, T. R. ; Glandon, R. P. ;
CORP Author Michigan State Univ., East Lansing. Dept. of Fisheries and Wildlife.;Corvallis Environmental Research Lab., OR.
Publisher c1987
Year Published 1987
Report Number EPA/600/J-87/546;
Stock Number PB91-171413
Additional Subjects Arsenic ; Lake Lansing(Michigan) ; Sedimentation ; Water pollution ; Mathematical models ; Littoral zone ; Sodium arsenite ; Surface waters ; Reprints ;
Holdings
Library Call Number Additional Info Location Last
Modified
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Status
NTIS  PB91-171413 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 09/04/1991
Collation 13p
Abstract
Lake Lansing, Michigan was treated with sodium arsenite for macrophyte control in 1957. Seven 1.5-m sediment cores were taken along a line through the littoral zone to the deepest portion of the lake and analyed for arsenic. In each core, arsenic concentrations going from the surface downward increased to some maximum and then receded to background. Depth of peak concentrations followed two patterns; three littoral cores showed peak arsenic at 0.13 m from the sediment surface, and four cores from progressively deeper portions of the lake showed a regular decrease in peak depth from 0.32 m to 0.17 m. Sediment accumulation rates were calculated along this transect. Particle-size sorting of sediments along this slope was also measured. This work suggested that sediments originated from wetland vegetation at the edge of the lake. Turbulent movement of water in the shallows caused suspension and down-slope movement of small particles. Fewer particles of wetland origin were available for sedimentation beyond the region of highest fallout (3.75 m), thus accounting for progressively lower sedimentation rates in deeper portions of the basin. A model was developed to predict the time it would take for surface sediments to reach pretreatment concentrations of arsenic levels; for Lake Lansing it would be more than 100 years. (Copyright (c) SETAC 1987.)