Rates of Arsenic Oxidation-Reduction Reactions in Contaminated Soils: Effects on Arsenic Fate and Mobility

EPA Grant Number: R825403
Title: Rates of Arsenic Oxidation-Reduction Reactions in Contaminated Soils: Effects on Arsenic Fate and Mobility
Investigators: Inskeep, William P.
Current Investigators: Inskeep, William P. , Jones, C. A. , Langner, H. W. , Macur, R. E.
Institution: Montana State University
EPA Project Officer: Chung, Serena
Project Period: December 15, 1996 through December 14, 1999
Project Amount: $329,735
RFA: Environmental Fate and Treatment of Toxics and Hazardous Wastes (1996) RFA Text |  Recipients Lists
Research Category: Hazardous Waste/Remediation , Land and Waste Management , Safer Chemicals


Arsenic (As) is an important priority pollutant found in soils contaminated by arsenical pesticides, natural geothermal sources and mine tailings. The chemical and biological processes which control the fate and mobility of As in contaminated soils and mine tailings are complex, primarily due to transformations of numerous As species which occur under temporally variable oxidation-reduction conditions. The objectives of the proposed project are to: (1) determine rates and underlying mechanisms of the reduction of sorbed arsenate in model systems, contaminated soils and mine tailings; (2) evaluate the importance of As-sulfide formation under conditions typical of As contaminated soils and mine tailings; and (3) evaluate the role of reduction of sorbed arsenate on the mobility and transport of As in contaminated soils, mine tailings and aquifers. The contaminated sites chosen for study include three important watersheds in southwestern Montana, and are representative of As contaminated sites commonly encountered in disturbed mine land soils. The proposed experiments include a complement of well-controlled laboratory studies using redox chambers and undisturbed columns to evaluate mechanisms and rates important in the reduction of sorbed As in contaminated soils. Data collected from this study will be used to evaluate predictive models for determining mobility of As and potential loading rates of As into surface and ground waters. Results obtained from this study will improve the link between fundamental kinetic processes controlling As speciation and watershed scale processes such as mobility, transport and bioavailability.

Publications and Presentations:

Publications have been submitted on this project: View all 12 publications for this project

Journal Articles:

Journal Articles have been submitted on this project: View all 7 journal articles for this project

Supplemental Keywords:

RFA, Scientific Discipline, Toxics, INTERNATIONAL COOPERATION, Geographic Area, Waste, Water, Ecosystem Protection/Environmental Exposure & Risk, POLLUTANTS/TOXICS, Bioavailability, National Recommended Water Quality, Water & Watershed, Contaminated Sediments, Environmental Chemistry, Geochemistry, Arsenic, State, Fate & Transport, Hazardous Waste, Ecological Risk Assessment, Water Pollutants, Hazardous, fate and transport, hazardous waste treatment, aquatic, contaminated mines, fate, sediment treatment, contaminant transport, redox metabolism, contaminated sediment, mine tailings, sediment transport, transport contaminants, arsenic sulfide, arsenic oxidation, contaminated soil, chemical contaminants, toxicity, mining, watershed influences, aquatic ecosystems, environmental stressors, environmental toxicant, harmful environmental agents, aquifers, redox cycle, aresenic oxidation reduction, arsenic mobility, water quality, Montana , hazardous waste sites, arsenic exposure, exposure assessment, arsenic oxidation reduction, groundwater, mining impacted watershed

Progress and Final Reports:

  • 1997 Progress Report
  • 1998 Progress Report
  • Final Report