Transformation of heavy metal fraction distribution in contaminated river sediment treated by chemical-enhanced washing

摘要

Mobility and toxicity of heavy metals in river sediments seldom relate to their total concentrations, but to a greater extent depend on their distribution of speciation fractions. Ex situ washing of dredged sediment can effectively reduce the total metal contents, but it may transform metals into more mobile species. This study investigated the changes of the metal fraction distribution and the mobility risk of chemical washed river sediment.