Linking Chemical Speciation, Desorption Kinetics, and Bioavailability of U and Ni in Aged-Contaminated Sediments: A Scientific Basis for Natural Attenuation and Risk Assessment

Bertsch, Paul M. ; Sowder, Andrew ; Jackson, Brian

Savannah River Ecology Lab., Aiken, SC (United States)

关键词: Desorption;    Leaching;    Attenuation;    Sediments;    37 Inorganic, Organic, Physical And Analytical Chemistry;   

DOI  :  10.2172/836464
RP-ID  :  EMSP-86845--2003
RP-ID  :  836464

美国|英语

来源: UNT Digital Library

【 摘 要 】

The extent to which heavy metals and radionuclides pose an environmental hazard depends on their potential for release to and transport in the environment, i.e., environmental availability, and their potential for introduction into biological systems, i.e., bioavailability. Although there exists a substantial body of literature pertaining to the fate, distribution, and bioavailability of contaminant metals in model laboratory systems, few studies have examined the biogeochemical cycling of heavy metals in complex aged-contaminated soils and sediments at a fundamental level. Even fewer have coupled detailed information on chemical speciation from state-of-the-art microscopic analytical and spectroscopic techniques with macroscopic observations obtained using indirect chemical extractions, metal desorption and leaching experiments, and biological uptake and toxicity assays.