Influence of Disposal Environment on Availability and Plant Uptake of Heavy Metals in Dredged Material.
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS ENVIRONMENTAL LAB
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Heavy metal uptake by Cyperus esculentus from 15 highly contaminated freshwater sediments under reduced flooded and oxidized upland disposal conditions was investigated in the greenhouse. Heavy metal uptake by Spartina alterniflora and Distichlis spicata from 14 highly contaminated saltwater sediments under flooded disposal conditions was also investigated in the greenhouse. The freshwater sediments were collected from waterways in the Great Lakes area the saltwater sediments were collected from the gulf and Atlantic coastal areas. The sediments were transported to the laboratory, where each sediment was mixed thoroughly and divided in half. One half of the sediment was potted and maintained in a flooded state the other half was air dried and ground before being potted upland condition. Cyperus esculentus was grown from tubers planted in the freshwater sediments. Seeds of S. alterniflora and D. spicata were planted in the saltwater sediments. All plants were allowed to grow to maximum vegetative yield C. esculentus, 90 days S. alterniflora and D. spicata, 131 days. The moisture content of the upland sediments was maintained between field capacity of the sediment and wilting point of the plant. The plants were harvested and analyzed for the heavy metals zinc, cadmium, copper, iron, manganese, arsenic, mercury, nickel, chromium, and lead. The sediments were analyzed for total heavy metals, diethylene triamine pentaacetic acid DTPA extractable heavy metals, heavy metals in the sediment interstitial water, oil and grease, pH, calcium carbonate equivalent, total sulfur, total phosphorus, total Kjeldahl nitrogen, and organic matter.
- Civil Engineering