Plant Bioassay of Contaminated Dredged Material

by Bobby L. Folsom, Jr., US Army Engineer Waterways, Experiment Station, Environmental, Lab, Vicksburg, MS, USA,
Karen M. Preston, US Army Engineer Waterways, Experiment Station, Environmental, Lab, Vicksburg, MS, USA,
Charles R. Lee, US Army Engineer Waterways, Experiment Station, Environmental, Lab, Vicksburg, MS, USA,



Document Type: Proceeding Paper

Part of: Dredging and Dredged Material Disposal

Abstract: Contaminant mobility from a contaminated saltwater sediment placed in flooded and upland disposal conditions was studied in the greenhouse. Spartina alterniflora was grown in contaminated saltwater sediment that either had been washed and then air-dried, or that had only been air-dried and not washed, or in the original flooded condition. S. alterniflora was allowed to grow to maximum vegetative growth, was harvested, and analyzed for zinc,cadmium, copper, chromium, and lead. Little or no plant growth occurred on unwashed air-dried sediment. Removal of excess salt by washing prior to air-drying resulted in much better plant growth, but also increased heavy metal uptake compared to plants grown in flooded sediment.

Subject Headings: Dredged materials | Pollution | Floods | Salt water | Biological processes | Material tests | Pollutants

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