Speciation and bioaecessibility as new tools for human health risk assessment of contaminated soils

摘要

Arsenic (As) is widely distributed throughout the crust (1.5-1.8 mg/kg soil) (Baroni et al., 2004), and represents a very important component of at least 245 mineral species. The trivalent forms of As are usually encountered in anoxic medium while pen-tavalent forms are involved in oxic medium (Steely et al., 2007). Inorganic species [As(Ⅲ), As(V)] are known to be more toxic than organic species such as MMA, DMA, and methyl arsines (Ruiz-Cancho et al., 2001).