You are here:
EFFECT OF AERATION OF SEDIMENT ON CADMIUM BINDING
Citation:
Zhuang, Y., H. Allen, AND G. Fue. EFFECT OF AERATION OF SEDIMENT ON CADMIUM BINDING. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-94/471 (NTIS PB95137337), 1994.
Description:
Acid-volatile sulfide (AVS) has been shown to be the dominant phase reacting with metals in anoxic sediments. he AVS is sediment decreases upon resuspension due to storms and dredging, and in winter when the rate of aeration processes exceeds that of the formation of sulfide. e conducted a series of lab aeration experiments in batch reactors to investigate the effects of aeration of sediment on the sulfide content of sediment and on the partitioning of cadmium, a model toxic metal, to the sediment. eration of sediment results in rapid decrease of the AVS. e studied the sediment characteristics for aeration periods of approximately a month. uring this time, the concentrations of dissolved metals increased by 200 to 400% or more, relative to the concentrations present at the beginning of the test. he concentrations of metals associated with AVS and with pyrite become increasingly more important in the binding of cadmium. ollowing the aeration, more than 50% of the cadmium was associated with the extractable iron and manganese components of the sediment. overall, the binding capacity of the sediments for cadmium decreased after aeration.
