Abstract
The effective remediation of DOE superfund sites contaminated by toxic heavy metals has been hampered by the paucity of knowledge about the kinetics and mechanism(s) of heavy metal retention/release by site media particles. Thus remediation strategies have been costly and ineffective. The information acquired in this project should assist in improving remediation strategies for toxic heavy metals contaminated soils. The objectives are: (1) To determine the effects of residence time on the mechanisms of heavy metals [i.e., Cr(IV), Cu(II), Co(II), and Pb(II)] sorption/release on soil clay mineral surfaces using kinetic studies coupled to extended x-ray absorption fine structure (EXAFS) spectroscopy and fourier transform infrared (FTIR) spectroscopy. (2) To study the effect of temperature, pH, and phosphate on metal sorption by clay minerals and derive thermodynamic parameters to describe the sorption process.
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