Antimony(V) Adsorption by Variable-Charge Minerals
Abstract
This research describes the adsorption of Sb(V) by the surface-reactive minerals that are common to soils and sediments. The results indicate that Sb(V) retention is strongly dependent on pH. Depending on the adsorbent, Sb(V) adsorption is also influenced by the ionic strength (salinity) and the presence of ligands (SO4 and PO4) that compete for adsorption sites. In general, Sb(V) 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 Sb(V) mobility and bioaccessibility. Geochemical models that predict the distribution of Sb(V) 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 Sb(V)-affected environments will require site-specific chemical information and calibration.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 2013
- Accession Number
- ADA606833
Entities
People
- Michael E Essington
Organizations
- University of Tennessee system