Antimony(V) Adsorption by Variable-Charge Minerals
Final rept. Jan 2010-Aug 2013
TENNESSEE UNIV KNOXVILLE
Pagination or Media Count:
This research describes the adsorption of SbV by the surface-reactive minerals that are common to soils and sediments. The results indicate that SbV retention is strongly dependent on pH. Depending on the adsorbent, SbV adsorption is also influenced by the ionic strength salinity and the presence of ligands SO4 and PO4 that compete for adsorption sites. In general, SbV is immobilized in strongly acidic environments, and by Fe- and Mnrich phases but not by Al-rich phases. The research findings also indicate that the addition of PO4-based fertilizer amendments to immobilize lead in shooting range soils will potentially enhance SbV mobility and bioaccessibility. Geochemical models that predict the distribution of SbV between soluble and adsorbed phases as a function of pH and ionic environment were successfully developed. However, the application of these models to predict behavior in SbV-affected environments will require site-specific chemical information and calibration.
- Inorganic Chemistry
- Physical Chemistry
- Geology, Geochemistry and Mineralogy