Accession Number : ADA139032
Title : Dredging Operations Technical Support Program. Transformation, Fixation, and Mobilization of Arsenic and Antimony in Contaminated Sediments.
Descriptive Note : Final rept. Jan 79-Jun 83,
Corporate Author : ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS
Personal Author(s) : Brannon,J M
Report Date : Jan 1984
Pagination or Media Count : 209
Abstract : The potential environmental impacts of arsenic (As) and antimony (Sb) contaminated sediments were studied with emphasis placed on short- and long-term leaching and sediment conditions that effect mobilization. Under anaerobic conditions, arsenate As(V) was reduced to arsenite As(III) in a wide range of sediments. In anaerobic Texas City sediment slurries, 70% of added As(V) was recovered as water soluble As(III) following three weeks of incubation. Formation of organic As following addition of As(V) to anaerobic sediments was also demonstrated. Short-term leaching was conducted with anaerobically incubated unamended and As-amended sediments using either distilled or saline water. Aerobic leaching experiments of six months duration were conducted to determine what As species would be released, the duration of the releases, and the sediment factors affecting releases. Long-term aerobic leaching caused significant changes in both sedimentary Fe and As phases. Sediments containing native and added Sb were subjected to similar experimental incubation, extraction procedures, and short- and long-term leaching as in the As experiments. Speciation of Sb was not examined however, so that only total Sb concentrations are available. Short-term releases of Sb were higher from amended than from unamended sediments.
Descriptors : *Sediments , *Contamination , Dredged materials , Contaminants , Arsenic , Antimony , Leaching , Concentration(Composition) , Release
Subject Categories : Hydrology, Limnology and Potamology
Distribution Statement : APPROVED FOR PUBLIC RELEASE