title: Influence of contact time and sediment composition on the bioavailability of Cd in sediments.
abstract: Stable isotope (111)Cd was spiked into sediments of different organic content levels for 3 days to 2 months. Bioavailability of spiked Cd to deposit-feeders, assessed by in vitro Cd solubilization, generally decreased with contact time but became comparable with that of background Cd after 2 months. This could be explained by the gradual transfer of Cd from the more mobile geochemical phase (carbonate associated phase) to more refractory phases (Fe-Mn oxide associated phase, and organic associated phase) within 2 months. The sedimentary organic content had a weak effect on Cd solubilization, while the distribution of Cd in carbonate or Fe-Mn oxide associated phase could have a larger influence on the solubilization of sedimentary Cd and its change with contact time. The observations in this study emphasize the need to consider Cd sequestration over time in sediments of various compositions, which would be useful in risk assessment of contaminated sediments.
authors.affiliation: Environmental and Resource Studies Program, Trent University, Peterborough, Ontario, Canada. huanzhong1982@hotmail.com
authors.forename: Huan
authors.initials: H
authors.lastname: Zhong
authors.forename: Lisa
authors.initials: L
authors.lastname: Kraemer
authors.forename: Douglas
authors.initials: D
authors.lastname: Evans
mesh_terms: D000327:Adsorption; D000818:Animals; D002104:Cadmium / Q000032:analysis*; D019015:Geologic Sediments / Q000737:chemistry; D008956:Models, Chemical; D045483:Rivers / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D014874:Water Pollutants, Chemical; D002104:Cadmium