X-ray Absorption Spectroscopy of Lead and Zinc Speciation in a Contaminated Groundwater Aquifer

摘要: The formation of insoluble metal sulfides in the environment may reduce mobility and bioavailability heavy contaminants potentially eliminate need for ex situ remediation certain hazardous waste sites. To assist assessing strategies Bypass 601 Superfund site, groundwater aquifer samples were analyzed using synchrotron X-ray absorption spectroscopy (XAS) to determine whether lead zinc dominant mineral phases. Moist solids contained between 150 1800 mg Pb/kg 100 250 Zn/kg. Lead sulfide was not any analyzed, including one sample collected from a well flood plain that 70% bonded sulfur, probably as ZnS. This portion had apparently been under reducing conditions. In all other samples, first-shell bonding Pb Zn predominantly oxygen. Data indicated PbO, PbCO3, PbSO4, ZnO species. XAS analyses sh...