Ben Kocar
Ben Kocar, Ph.D.
Managing Scientist
Environmental & Earth Sciences
Pasadena

Dr. Kocar is a managing scientist with over 18 years of experience examining physical, chemical, and biological factors governing the fate, transport, and transformation of nutrients, contaminants and trace gases in the environment. He has designed and executed field and laboratory studies for understanding water movement and chemical migration in soils, wetlands, aquifers and natural waters, and employs groundwater and geochemical modeling tools to understand and predict their flux across complex geologic settings. He has also used numerous conventional and advanced analytical tools to detect, quantify, fingerprint and assess the bioavailability of chemicals associated with environmental solids, liquids and gases; these include toxic metal(loids) such as arsenic, mercury, and chromium, radionuclides such as radium, radon and uranium, nutrients such as carbon, nitrogen and phosphorus, and trace gases such as methane, carbon dioxide, and nitrous oxide.

Dr. Kocar has over 7 years of experience serving as an instructor and professor at Stanford and MIT, respectively, where he taught classroom, laboratory and field-based subjects in contaminant hydrogeology, environmental chemistry, and soil science. He also worked as an engineering physicist at the Stanford Synchrotron Radiation Lightsource/SLAC National Laboratory, where he supported numerous research groups using advanced analytical techniques to examine inorganic constituents within a diverse array of materials, including minerals, rocks, fossils, plant and animal tissues, items relating to cultural heritage (e.g. paintings, pottery and human remains), structural materials (e.g. steel and concrete), corrosion products, and experimental batteries. Dr. Kocar has published over 30 peer-reviewed articles and book chapters and has authored or co-authored over 85 conference presentations (multiple key-note and invited), including the annual American Geophysical Union, Goldschmidt (geochemistry), Soil Science Society of America and American Chemical Society meetings.

Dr. Kocar’s additional areas of expertise include the in-situ treatment and remediation of contaminants, including permeable reactive barriers; use of unmanned aerial vehicles (UAV’s) to gather remote sensing data relating to plant health, thermal imagery and soil moisture; the fate and transport of emerging contaminants, including nanoparticulate materials; photochemistry of nutrients and contaminants; trophic cascades of contaminants; land-atmosphere trace and greenhouse gas exchange (carbon dioxide, methane, nitrous oxide) in natural and agroecosystems; soil quality and nutrient cycling; the fate and transport of organic contaminants; hazardous algal blooms (HABS); microbial fuel cells and electron transfer in natural solids; the science and policy of radioactive waste; extreme weather impacts on release of toxins to the environment; and distributed environmental sensor networks.

CREDENTIALS & PROFESSIONAL HONORS

  • Ph.D., Geological and Environmental Science, Stanford University
  • M.S., Land Resources and Environmental Chemistry, Montana State University, 2002
  • B.S., Chemistry-Biochemistry, Montana State University, 2000
  • B.S., Soil and Environmental Science, Montana State University, 2000
  • SSSA Emil Truog Award for Best PhD Dissertation in Soil Science, 2009 

    U. S. EPA STAR Graduate Fellowship, 2004-2007 

    Best Graduate Student Presentation: 84th Meeting of AAAS-Pacific Division, 2003 

    J. Thomas Dutro, Jr. Award for Excellence in the Geosciences, AAAS, 2003 

    Graduate Student Fellowship: Montana State University Thermal Biology Institute, 2000-2002

Publications

Publications (over 1,500 citations on Web of Science, h index = 22)

Mehta, N and Kocar, B.D. (2018) Deciphering and Predicting Microscale Controls on Radon Production in Soils, Sediments and Rock. Soil Processes. 2, 30, 1-14.

Chen, M.A. and Kocar, B.D. (2018) Radium Sorption to Iron (hydr)oxides, Pyrite and Montmorillonite: Implications for Mobility. 52, 4023-30. Environmental Science and Technology.

Hagan, D., Issacman-VanWertz, G., Franklin, JP, Wallace, LMM, Kocar, B.D., Heald, CL, Kroll, JH. (2018) Calibration and assessment of electrochemical air quality sensors by co-location with regulatory-grade instruments. Atmospheric Measurement Techniques. 11, 315-328.

L. Li…, Kocar B.D. et al (2017). Expanding the Role of Reactive Transport Models in Critical Zone Processes. Earth-Science Reviews. 165. 280-301.

Johnson, J. Savalia, P., Davis, R. Kocar, B.D., Webb, S. Nealson, K.H., Fischer, W. (2016) Real-Time Manganese Phase Dynamics during Biological and Abiotic Manganese Oxide Reduction. Environmental Science and Technology. 8, 4248-4258.

Stuckey, J., Schaefer, M.V., Kocar B.D. Benner, S.G. and Fendorf S. (2016) Arsenic Release Metabolically Limited to Permanently Saturated Soil in Mekong Delta. Nature Geoscience. 9, 70- 

Kraal, P. Burton, E.D., Rose, A.L, Grice, K., Lockhart, R.S., Tan, E., Bush, R.T., Webb, S.M., Kocar, B.D. (2015) Phosphorus Dynamics in Eutrophic Estuarine Sediments with Contrasting Iron Redox Chemistry. Chemical Geology. 392, 19-31. 

Stuckey, J.W., Schaefer, M.V., Kocar, B.D., Ditmar, J.D., Pacheco, J.L., Benner, S.G., Fendorf, S. (2015). Peat formation concentrates arsenic within sediment deposits of the Mekong Delta. Geochimica et Cosmochimica Acta: 149, 190-205.

Burton, E.D., Johnson, S.G, Kocar, B.D. (2014) Arsenic Mobility during Flooding of Contaminated Soil: The Effect of Microbial Sulfate Reduction. Environmental Science and Technology. 48 (23) 13660-7.

Prouty, N.G., Roark, E.B., Koenig, A.E., Demopoulos, A.W.G., Batista, F.C., Kocar, B.D., Selby, D., McCarthy, M.D., Mienis, F. (2014). Deep Sea Coral Record of Human Impact on Watershed Quality in the Mississippi River Basin. Global Biogeochemical Cycles: (28) 9, 29-43.

Kocar B.D., Benner, S.G. and Fendorf S. (2014) Deciphering and Predicting Spatial and Temporal Concentrations of Arsenic within the Mekong Delta Aquifer. Environmental Chemistry. 11 (5).

Masue-Slowey, Y., Ying, S.C., Kocar, B.D., Pallud, C.E., Fendorf, S. (2013) Dependence of Arsenic Fate and Transport on Biogeochemical Heterogeneity Arising from Physical Structure of Soils and Sediments. Journal of Environmental Quality: 42 (4), 1119-1129. 

Seyfferth, A., Kocar, B.D., Lee, J.A., Fendorf, S. (2013). Seasonal Dynamics of Dissolved Silicon in a Rice Cropping System after Straw Incorporation. Geochimica et Cosmochimica Acta. 123, 120-133.

Ying, S.C., Masue-Slowey, Y., Kocar, B.D., Griffis, S.D., Webb, S., Marcus, M., Francis, C. and Fendorf, S. (2013). Distributed Microbially- and Chemically-Mediated Redox Processes Controlling Arsenic Dynamics within Mn/Fe-oxide Constructed Aggregates. Geochimica et Cosmochimica Acta. (104) 29-41. 

Kozubal, M.A., Macur, R.E., Jay, Z.J., Beam, J.P., Malfatti, S.A., Tringe, S.G., Kocar, B.D., Borch, T., and Inskeep, W.P. (2012). Microbial Iron Cycling in Acidic Geothermal Springs of Yellowstone National Park: Integrating Molecular Surveys, Geochemical Processes, and Isolation of Novel Fe-Active Microorganisms. Frontiers in Microbiology. 3 (109), 1-16.

Ying, S.C., Kocar, B.D., and Fendorf, S. Oxidation and Competitive Retention of Arsenic between Iron and Manganese Oxides. (2012). Geochimica et Cosmochimica Acta: 96 (1) 294-303. 

Ushizima, D., Parkinson, D., Nico, P., Ajo-Franklin, J., Macdowell, A., Kocar, B.D., Bethel, W., Sethian, J. (2011) Statistical Segmentation and Porosity Quantificaiton of 3D X-ray Micro-tomography. Applications of Digital Image Processing. Vol 8135, Article no. 813502. 

Sharma, P., Rolle, M., Kocar, B.D., Grathwohl, Pl, Fendorf, S., Kappler, A. (2011) Influence of Natural Organic Matter on Arsenic Transport and Retention. Environmental Science and Technology. 45 (13) 5572-5579. 

Kocar, B.D. and Fendorf, S. (2011). Arsenic Release and Transport in Sediments of the Mekong Delta. In: Interdisciplinary Studies on Environmental Chemistry –Environmental Pollution and Ecotoxicology. pp 117-124.

Masue-Slowey, Y., Kocar, B.D., Jofre, S., Mayer, K.U., and Fedorf, S. (2010). Transport Implications Resulting from Internal Redistribution of Arsenic and Iron within Constructed Soil Aggregates. Environmental Science and Technology. 45 (2) 582-588.

Kocar, B.D., Borch, T., and Fendorf. (2010). Arsenic Mobilization and Repartitioning During Biogenic Sulfidization and Transformation of Ferrihydrite. Geochimica et Cosmochimica Acta. 74, 980-994.

Robinson, D.A., Lebron, I., Kocar, B.D., Phan, K., Sampson, M., Crook, N. Fendorf, S. (2009). Time-lapse Geophysical Imaging of Soil Moisture Dynamics in Tropical Deltaic Soils: An Aid to Interpreting Hydrological and Geochemical Processes. Water Resources Research. 45, W00D32, 1-12. 

Busbee, M.W., Kocar B.D., Benner, S.G. (2009). Irrigation Produces Elevated Arsenic in the Underlying Groundwater of a Semi-Arid Basin in Southwestern Idaho. Applied Geochemistry, 24, 843.

Kocar, B.D., and Fendorf, S. (2009). Thermodynamic Constraints on Reductive Reactions Influencing the Biogeochemistry of Arsenic in Soils and Sediments. Environmental Science and Technology. 43, 4871-4877.

Benner, S.G., Polizzotto, M.P., Kocar, B.D., Sampson, M. and Fendorf, S. (2008) Groundwater Flow in an Arsenic-Contaminated Aquifer, Mekong Delta. Applied Geochemistry, 23 (11) 3072-3087.

Polizzotto, M., Kocar, B.D., Benner, S., Sampson, M., and Fendorf, S. (2008) Near-Surface Wetland Sediments as a Source of Arsenic Release to Groundwater in Asia. Nature. 454. 505-508.

Kocar B.D., Polizzotto, M.L., Benner, S.G., Ying, S.C., Ung, M., Ouch, K., Samreth, S., Suy, B., Phan, K., Sampson, M., Fendorf, S. (2008) Integrated Biogeochemical and Hydrologic Processes Driving Arsenic Release from Shallow Sediments to Groundwaters of the Mekong Delta. Applied Geochemistry, 23 (11) 3059-3071. 

Kocar, B.D., Herbel, M.J., Tufano, K., and Fendorf, S. (2006). Contrasting Effects of Dissimilatory As(V) and Fe(III) reduction on Arsenic Retention and Transport. Environmental Science and Technology. 40 (21): 6715-6721.

Kocar, B.D., Garrott, R., and Inskeep, W.P. (2004) Elk Exposure to Arsenic in Geothermal Waters of Yellowstone National Park, USA. Environmental Toxicology and Chemistry, 23: 982-989. 

Johnson, S.B., Yoon, T.H., Kocar, B.D., and G.E. Brown, Jr. (2004). Adsorption of Organic Matter at Mineral/Water Interfaces II: Outer-sphere Adsorption of Maleate and Implications for Dissolution Processes. Langmuir. 20 (12): 4996-5006. 

Macur, R.E., Langner, H.W., Kocar, B.D., and Inskeep, W.P. (2004). Linking Geochemical Processes with Microbial Community Analysis: Successional Dynamics in an Arsenic-Rich, Acid-Sulfate-Chloride Geothermal Spring. Geobiology 2, 165-167

Kocar B.D. and Inskeep, W.P. (2003). Photochemical Oxidation of Arsenite in Ferrioxalate Solutions (2003). Environmental Science and Technology. 37: 1581-1588.

Book Chapters

Fendorf, S., Herbel, M., Tufano, K., Kocar, B.D. (2007). Biogeochemical Processes Controlling the Cycling of Arsenic in Soils and Sediments. In Biophysico-chemical Processes of Heavy Metals and Metalloids in Soil Environments. Wiley and Sons, San Francisco. (ISBN: 978-0-471-73778-0).

Fendorf, S., Nico, P., Kocar, B.D., Masue, Y., Tufano, K., (2010). Arsenic Chemistry in Soils and Sediments. In Developments in Soil Science: Synchrotron-Based Techniques in Soils and Sediments. Elsevier (ISBN-13: 978-0444532619).

Invited Presentations and Lectures

Kocar, B.D. (Keynote). Examining Nanoscale Biogeochemical Controls on Metals, Radionuclides and Soil-Aqueous Particulate Organic Carbon Using Conventional and Synchrotron-Based Techniques (August, 2018), for Goldschmidt Annual Meeting, Boston, MA.

Kocar, B.D. (2017) Measuring and Deciphering Microscale Biogeochemical Controls on Soil-Sedimentary Nutrients and Contaminants using Synchrotron-Based Techniques. For NSLS-II Symposium, 2017, Brookhaven, NY.

Kocar, B.D. (2014) Using X-ray Microprobe Techniques to Examine Coupled Biogeochemical-Hydrologic Processes responsible for Contaminant Mobilization and Retention in Soils and Sediments. For NSLS-II Users Meeting, Brookhaven, NY.

Kocar, B.D. Understanding Biogeochemistry in Complex Physical Environments (2014). For United States Geological Survey (USGS), Santa Cruz, CA. 

Kocar, B.D. Understanding Biogeochemistry in Complex Physical Environments (2013). For Massachusetts Institute of Technology.

Kocar, B.D., Deciphering and Scaling Biogeochemical Processes Responsible for the World’s Largest Mass Poisoning. (2013). For University of Michigan.

Kocar, B.D. Arsenic Release and Transport in Sediments of the Mekong Delta. (2011) For Symposium on Advanced Studies in Environmental Research, Global Center of Excellence Institute, Ehime University, Japan. 

Kocar, B.D. Defining and Scaling Coupled Hydrological-Biogeochemical Processes Responsible for the World’s Largest Mass Poisoning (2011). For Department of Environmental Science and Engineering, California Institute of Technology.

Kocar, B.D. Defining and Scaling Coupled Geochemical-Hydrologic Processes Responsible for the World's Largest Mass Poisoning. (2011). For Department of Earth Sciences, Dartmouth College.

Fendorf, S. Masue, Y., Kocar, B.D. (speaker), Ying, S. (2010). Biogeochemically Induced Mineral Transformations Controlling the Fate of Arsenic. Keynote Presentation, For Goldschmidt annual meeting, Knoxville, TN.

Kocar, B.D. and Fendorf, S. Defining and Predicting Biogeochemical Processes Contributing to Arsenic Release in Sediments of the Mekong Delta. (2009). For Charles University, Prague, Czech Republic. 

Kocar, B.D. and Fendorf, S. Biogeochemical Processes Governing the Fate of Arsenic in Sediments of South and Southeast Asia. (2009). For Department of Earth and Ocean Sciences, University of British Columbia, Canada.

Kocar, B.D. and Fendorf, S. Soil-Sediment Processes Governing Arsenic Release and Transport in Sediments of South and Southeast Asia (2009). For Center for Applied Geoscience-Geomicrobiology. University of Tübingen, Germany.

Kocar B.D., S. Ying, M. Polizzotto, and S. Fendorf. (2008). Defining and Simulating the Coupled Biogeochemical and Hydrologic Processes Governing Arsenic Mobility within Soils and Sediments of the Mekong Delta, Cambodia. For Annual meeting of the Stanford-National Science Foundation Environmental Molecular Sciences Institute.

Kocar B.D. S. Ying, M. Polizzotto, and S. Fendorf. (2007). Arsenic Release During Sulfidization and Transformation of Ferrihydrite. Stanford University. Annual meeting of the Stanford-National Science Foundation Environmental Molecular Sciences Institute.

Kocar B.D., S. Ying, M. Polizzotto, and S. Fendorf. (2006). Arsenic Release from Tropical Soils. Stanford University. San Francisco State University, San Francisco CA.

Kocar B.D., S. Ying, M. Polizzotto, and S. Fendorf. (2006). Arsenic Desorption from Ferrihydrite During bBiogenic Sulfide Production. Stanford University. Annual meeting of the Stanford-National Science Foundation Environmental Molecular Sciences Institute.

Kocar B.D., B.S. Stewart, and S. Fendorf. (2004). (A)Biotically Generated Hydrogen Sulfide and Ferrous Iron Reactions with Arsenic-Doped Ferrihydrite: Pathways of Arsenic Mobilization and Sequestration. Stanford University. Soil Science Society of America annual meeting, Seattle, WA.

Kocar B.D., R.A. Garrott, and W.P Inskeep. (2003). Elk Exposure to Arsenic in the Madison-Firehole Watershed, Yellowstone National Park. Stanford University. Soil Science Society of America annual meeting, Denver, CO.

Presentations-Volunteered

Gadol H.J. and Kocar B.D. Influence of Iron (hydr)oxide Mineralogy on Soil-Sedimentary Methanogenesis (2018). For Goldschmidt Annual Meeting, Boston MA. 

Chen M., Gadol, H., and Kocar B.D. (2018) Examining Coupled Mineralogical-Redox Controls on Chromium Cycling in Soils and Sediments. For Goldschmidt Annual Meeting, Boston, MA.

Mehta N., Benzerara, K., and Kocar B.D. (2018) Radium Retention by Cyanobacteria Forming Intracellular Carbonates. For Goldschmidt Annual Meeting, Boston, MA.

Kocar B.D., Mehta N., Gadol H.J., Chen M. Gelfond, C.E., Carrasquillo A.J. Deciphering Coupled Mineralogical-Redox Controls on Methane Cycling in Variably Saturated Soils and Sediments. (2017). For AGU annual meeting, New Orleans, LA.

Carrasquillo A., Gelfond C., and Kocar B (speaker). Formation and Reactivity of Dissolved Species from the Photolysis of Particulate Organic Matter (2017). For Goldschmidt Annual Meeting, Paris France. 

Mehta, N. Harvey, C. and Kocar B.D. (2017) Investigating Mechanisms to Understand Variability in Radium Isotopic Activity Ratios in Natural Environments. For Goldschmidt Annual Meeting, Paris, France. 

Chen M. and Kocar B.D. Controls on the Immobilization of Radium and Uranium in Natural Aquifers. (2017) For Soil Science Society of America Annual Meeting, San Francisco, CA.

Carrasquillo A.J., Gelfond C.E. and Kocar B.D. (2016) Photochemical Reactions of Particulate Organic Matter: Deciphering the Role of Direct and Indirect Processes. For American Geophysical Union Annual Meeting, San Francisco, CA.

Chen M. and Kocar B.D. Radium Adsorption to Iron Bearing Minerals in Variable Salinity Waters. (2016) For American Chemical Society Annual Meeting, Boston, MA.

Kocar B.D., Gelfond C.E. Photochemically-Driven Reduction of Mercury-(II) in the Presence of Particulate Organic Matter. (2016). For American Geophysical Union Annual Meeting, San Francisco CA.

Mehta N., Harvey C.H., and Kocar B.D. Alpha Recoil Flux of Radon in Groundwater and its Experimental Measurement. (2016). For American Geophysical Union Annual Meeting, San Francisco, CA.

Mehta N., Harvey C., Kocar B.D. Investigating Radioactivity and Trace Element Leaching from Shale in Unconventional Oil and Gas Exploration. (2016). For American Chemical Society Annual Meeting, San Diego, CA.

Mehta N, Harvey C.F., and Kocar B.D. Experimental Measurement of Alpha Recoil Flux of Radionuclides and its Application to Hydraulic Fracturing. (2016). For Geochemical Society of America.

Gelfond C.E., Carrasquillo A.J., and Kocar B.D. (2015) Effects of Particulate Organic Matter Complexation and Photo-Irradiation on the Fate and Toxicity of Mercury(II) in Aqueous Systems. For American Geophysical Union Annual meeting, San Francisco, CA.

Carrasquillo A., Gelfond C.E., and Kocar B.D. (2015). Photochemical Alteration of Phragmites Australis Plant Litter: New Insight into the Chemical Evolution of Particulate Organic Matter. For American Geophysical Union annual meeting, San Francisco, CA.

Prouty N., Roark B., Koenig A., Batista F.C., Kocar B.D., Mccarthy, M., Mienis, F., Ross, S., and Demopolous, A.W., (2015) Deep-sea Coral Record of Human Impact on Watershed Quality of the Misssissippi River Basin. For American Geophysical Union Annual Meeting, San Francisco, CA.

Chen M., Wang T. and Kocar B.D. (2015) Controls on Radium Sorption to Iron Minerals. For American Geophysical Union annual meeting, San Francisco, CA.

Stuckey J., Schaefer M., Kocar B.D., Benner S.G., and Fendorf S. (2015). Wetland Hydrology Dictates Organic Carbon Reactivity Controlling Arsenic Release within the Mekong Delta. For American Chemical Society Annual Meeting.

Chen M. and Kocar. B.D. (2014) Radium Adsorption to Iron Bearing Minerals in Variable Salinity Waters. For American Geophysical Union Annual Meeting, San Francisco, CA.

Johnson J.E., Savalia P. Kocar B.D., Webb S., Nealson K.H., and Fischer W.W. (2014). Understanding the Development and Stabilization of Mn(III) Intermediates during Microbial Manganese Reduction. For American Geophysical Union Annual Meeting, San Francisco, USA.

Kocar B.D. and Webb S. (2012). Soft X-Ray Microscopy at the Stanford Synchrotron Radiation Lightsource. For the XAFS Conference, Shanghai, China. 

Davis J., Singer D., Fox P., Guo H., Minor A., Kocar B.D., and Waychunas G. Characterization of Secondary Mineral Grain Coatings and their Role in Redox Reactions of Arsenic. (2013). For American Chemical Society Annual Meeting, New Orleans, LA.

Kocar B.D and Fendorf, S. Variation in Biogeochemical Processes Controlling Uranium and Chromium Induced by Soil Physical Complexity. (2010). For Soil Science Society of America annual meeting, Long Beach, CA. 

Ying S.C., Kocar B.D., Masue-Slowey Y., and Fendorf S. Fate of Arsenic in the Presence of Birnessite and Dissimilatory Metal Reducing Bacteria. (2010). For Soil Science Society of America annual meeting, Long Beach, CA. 

Stuckey J., Kocar B.D., and Fendorf S. What Governs the Rate of Arsenic Release from Mekong River Delta Sediments? (2010). For Soil Science Society of America annual meeting, Long Beach, CA. 

Fendorf S., Masue Y., Kocar B., Ying S. (2010). Biogeochemically Induced Mineral Transformations Controlling the Fate of Arsenic. For Goldschmidt annual meeting, Knoxville, TN.

Sharma P., Rolle M., Kocar B.D., Fendorf S., and Kappler A. (2010). Influence of Humic and Fulvic Acid on Arsenic Transport in Columns Filled with Ferrihydrite-Coated Sand. For Goldschmidt annual meeting, Knoxville, TN.

Masue Y., Kocar B.D., Bea Jofre S.A., Mayer K.U., Pallud C., and Fendorf S. (2010). Fate and Transport of Arsenic from Constructed Soil Aggregates. For Goldschmidt annual meeting, Knoxville, TN.

Ying S.C., Griffis, S. Masue-Slowey Y., Kocar B.D., Fendorf S., Francis C.A (2010). Role of Dissimilatory Metal-reducing Bacteria in Arsenic Transport within Manganese and Iron Oxide Containing Aggregates. For American Society for Microbiology, 2010, San Diego, CA.

Fendorf S., Masue-Slowey Y., Seyfferth A.L., Kocar B.D., and Nico P.S. (2010). Deciphering Processes Controlling the Transport and Plant Uptake of Arsenic in Soils and Sediments. For Annual Meeting of the American Chemical Society.

Kocar B.D and Fendorf S. Diffusive Controls and Thermodynamic Constraints on Reductive Biogeochemical Reactions. (2009). For Soil Science Society of America annual meeting, Pittsburgh, PA. 

Kocar B.D. and Fendorf S., (2009). Diffusive Controls and Thermodynamic Constraints on Reductive Biogeochemical Reactions. For Goldschmidt, 2009, Davos, Switzerland.

Kocar B.D., Polizzotto M., Ying S, Benner S.G., Sampson M., Fendorf S. (2009). Measuring and Simulating the Near-Surface Biogeochemical and Hydrologic Processes Governing Arsenic Transport in the Mekong Delta, Cambodia. For AGU Chapman Conference in Siem Reap, Cambodia.

Kocar B.D., Polizzotto M., Ying S, Benner S.G., Sampson M., Fendorf S. (2009). Coupled Biogeochemical and Hydrologic Processes Governing Arsenic Mobility within Sediments of Southeast Asia. For AGU Annual Meeting, San Francisco, USA.

Ying S.C., Kocar B.D., Francis C.A, Fendorf S., (2009). Mixed Mineralogical and Biogeochemical Controls on Arsenic Fate in Diffusively Controlled and Physically Complex Media. For Soil Science Society of America Annual Meeting, (2009), Pittsburgh, PA.

Ying S.C., Kocar B.D., Masue-Slowey Y, Francis, C.A Fendorf, S., 2009. Mixed Mineralogical and Biogeochemical Controls on Arsenic Fate in Diffusively Controlled and Physically Complex Media. For Goldschmidt, 2009, Davos, Switzerland.

Sharma P, Kocar B.D., Fendorf S. Kappler A. (2009). Formation and Transport of Complexes of Arsenic, Iron, and Organic Matter in a Flow Through System. For Goldschmidt, 2009, Davos, Switzerland.

Bostick B.C. and Kocar B.D. (2009) The Role of Sulfur Cycling on Arsenic Fate and Mobility in Sediments of South and Southeast Asia. For American Geophysical Union Chapman Conference in Siem Reap, Cambodia.

Polizzotto M.L., Kocar B.D., Benner S.G, Sampson M, Phan K., Ouch K., Fendorf S. (2009). Coupled Hydrologic and Biogeochemical Processes Controlling Arsenic in Cambodian Groundwater. For American Geophysical Union Chapman Conference in Siem Reap, Cambodia.

Benner S.G., Polizzotto M.L., Kocar B.D., Sampson M., Fendorf S. (2009). Hydrologic Constraints on Arsenic Behavior, Observations from a Field Site in Cambodia. For American Geophysical Union Chapman Conference in Siem Reap, Cambodia.

Kocar B.D., Polizzotto M., Ying S, Benner S.G., Sampson M., Fendorf, S. (2008). Coupled Biogeochemical and Hydrologic Processes Governing Arsenic Mobility within Sediments of Southeast Asia. For AGU Annual Meeting, San Francisco, USA.

Kocar B.D., Ying S.C., Polizzotto, M.L., Benner S.G., Ung M., Suy B., Phan K., Sampson M., Fendorf S. Coupled Biogeochemical and Hydrologic Processes Governing Arsenic Transport within Evolving Sedimentary Basins of Southeast Asia. (2008). For Soil Science Society of America annual meeting, Houston, TX. 

Kocar B.D., Ying S, Polizzotto M., Ung M., Suy B, Phan K, Samreth S., Sampson M., Benner S. Fendorf S. (2008). Defining and Simulating the Coupled Biogeochemical and Hydrologic Processes Governing Arsenic Transport within Evolving Sedimentary Basins of Southeast Asia. For Goldschmidt Annual Meeting, Vancouver, BC, Canada.

Benner S.G., Polizzotto M.L., Kocar B.D., Sampson M., Fendorf S. (2008). Linking Hydrologic Drivers to Arsenic Contamination in Asia, Results From a Field Site in Cambodia. For American Geophysical Union Annual Meeting, San Francisco, USA.

Fendorf S, Kocar B.D., Tufano K., Masue Y., Polizzotto M., Pallud C., Benner S. (2008). Defining Spatial and Temporal Variations in Biogeochemical Processes Governing Arsenic Mobility. For Goldschmidt Annual Meeting, Vancouver, BC, Canada.

Fendorf, S., Kocar B.D., Masue-Slowey Y., Tufano K., Benner S., Nico P.S., Saltikov C.W. (2008) Process Level Heterogeneity Controlling the Fate of Arsenic. For American Chemical Society Annual Meeting. 

Ying S.C., Kocar B.D., Fendorf S., Francis C.A. (2007). Diversity and Arsenic-Adsorption Properties of Mn(III)-Oxidizing Bacteria within Tropical Wetlands of the Mekong Delta. For American Geophysical Union Annual Meeting, San Francisco, CA.

Polizzotto M., Benner S.G., Kocar B.D., Sampson M., Ouch K., Phan K., Fendorf S. (2007). Evaluating Sources of Arsenic to Groundwater in the Mekong Delta Based on Coupled Hydrologic and Biogeochemical Analysis. For American Geophysical Union Annual Meeting, San Francisco, CA.

Fendorf S., Kocar B.D., Polizzotto M., Crook N., and S. Benner. (2007). Process Coupling Controlling the Migration of Arsenic in Soils of Southeast Asia. For Soil Science Society of America Annual Meeting, New Orleans, LA. 

Ying S.C., Kocar B.D., Fendorf S, Francis C.A. Arsenic Mobilization within Deltaic Soils of Asia: Diversity of Arsenic(V) Reductase (arrA) Genes Across Redox Gradients (2007). For American Society of Microbiology Annual Meeting, Toronto, ON.

Ying, S.C., Kocar B.D., Sampson M, Fendorf S, Francis C. Near Surface Porewater and Surface Water Cycling of Arsenic and Manganese in the Mekong Delta, Cambodia. (2007). For Association of American Geographers Annual Meeting, San Francisco, CA.

Kocar B.D. and S. Fendorf. (2007). Sulfidogenesis Controls on Ferrihydrite Transformation and Repartitioning of Sorbed Arsenic. Stanford University. For American Geophysical Union Annual Meeting, San Francisco, CA.

Kocar B.D., Ying S.C., and Fendorf S. (2007). Release and Transport Pathways of Arsenic with Seasonally Saturated, Tropical Wetlands of the Mekong Delta. For Soil Science Society of America annual meeting, New Orleans, LA.

Masue Y., Borch T, Kocar B.D., Fendorf S. (2006). Arsenic Attenuation upon Bioreduction of Ferrihydrite. For World Soils Congress, PA, USA.

Fendorf S., Ginder-Vogel M., Polizzotto M., Kocar B.D., and Tufano K. (2006) Resolving Biogeochemical Processes Controlling Metal Ion Fate and Transport within Soils. For World Soils Congress, PA, USA.

Kocar B.D., Ying S.C., Polizzotto M., Ung M., Samreth S., Leng M., Sampson M., and Fendorf S. (2006). Arsenic Retention and Release from Ferrihydrite and Tropical Soils during Iron and Sulfate Reduction. For American Geophysical Union Annual Meeting, San Francisco, CA.

Kocar B.D., Ying S.C., Polizzotto M., Ung M., Samreth S., Leng M., Sampson M., and Fendorf. S. (2006). Iron (hydr) Oxide Transformation and Release of Arsenic from Tropical Soils During Iron and Sulfate Reduction. For Soil Science Society of America annual meeting, Indianapolis, IN.

Kocar B.D., Masue Y., Tufano K, Ying S.C., Polizzotto M., Borch T., and Fendorf S. (2006). Iron (Hydr)oxide Transformation and Release of Arsenic from Ferrihydrite and Tropical Soils during Sulfate Reduction. For World Soils Congress, PA, USA.

Polizzotto M., Kocar B.D., Sampson M., Benner S., Ouch K., Ung M., Fendorf S, (2005). Arsenic Contamination in the Flood Plain Aquifer of the Mekong Delta, Cambodia. For Geological Society of America Annual Meeting, Salt Lake City, UT.

Borch, Masue Y., Kocar B.D., and Fendorf S. (2005). Phosphate Dynamics upon the Biomineralization of Iron Oxides. For Soil Science Society of America annual meeting, Salt Lake City, UT.

Tufano K., Stewart B, Kocar B.D., and Fendorf S. (2005). Deciphering the Role of Reductive Iron Transformations on Arsenic Transport. For Soil Science Society of America annual meeting, Salt Lake City, UT.

Masue Y, Kocar B.D., Borch T., Fendorf S. (2005). Arsenic Retention on Ferrihydrite: Stability under Aerobic and Anaerobic Conditions. For 230th American Geophysical Union Meeting, Washington, D.C.

Tufano K.J., Stewart B, Kocar B.D., Fendorf S. (2005). Stimulated Migration of Arsenic by Reductive Transformation of Iron. For 230th American Geophysical Union Meeting, Washington, D.C.

Fendorf, S., Kocar B.D., Tufano K., Herbel M.. (2005). Biogeochemical Processes Governing the Cycling of Arsenic and Chromium in Soils and Sediments. For ISSM/ISEB Meeting, Jackson Hole, WY.

T. Borch, Y. Masue, Kocar B.D., S. Fendorf. (2005). Poisoning of the Biogeochemical Cycle of Iron by Surface Compositional Changes. For ISSM/ISEB Meeting, Jackson Hole, WY.

Tufano K., Stewart B., Kocar B.D., Herbel, S. Fendorf. (2005). Stimulated Migration of Arsenic and Uranium by Reductive Transformation of Iron. For Goldschmidt Annual Meeting, Moscow, ID.

Kocar B.D., T. Borch and S. Fendorf. (2005). Release of Arsenic and Transformation of Iron (Hydr)oxides During Sulfidogenesis. For Soil Science Society of America annual meeting, Salt Lake City, UT.

Kocar B.D., T. Borch, S. Fendorf. (2005). Sulfidogenesis Controls on Iron (Hydr)oxide Transformation and Release of Arsenic. Stanford University. For 230th ACS Meeting, Washington, D.C.

Kocar B.D., K. Tufano, Y. Masue, B. Stewart, M. Herbel, S. Fendorf. (2005). Reactions of Biogenic Ferrous Iron and Sulfide with Arsenic-Doped Ferrihydrite: Pathways of Arsenic Mobilization and Sequestration. For ISSM/ISEB Meeting, Jackson Hole, WY.

Kocar B.D., K. Tufano, Y. Masue, B.S. Stewart, M. Herbel, S. Fendorf. (2005). Arsenic Mobilization Influenced by Iron Reduction and Sulfidogenesis. For Goldschmidt Annual Meeting, Moscow, ID.

K.J Tufano, T. Borch, Kocar B.D. and S. Fendorf. (2004). Heterogeneity in Redox Processes within Porous Media: Impact of Diffusive Gradients on Bacterial Activity and Iron Transformations. For Soil Science Society of America annual meeting, Seattle, WA.

Kocar B.D., B.S. Stewart, M. Herbel M., Fendorf S. (2004). Arsenic Mobilization Influenced by Iron Reduction and Sulfidogenesis under Dynamic Flow. For American Geophysical Union Annual Meeting, San Francisco, CA.

Kocar B.D. (2004). (A)Biotically Generated Hydrogen Sulfide and Ferrous Iron Reactions with Arsenic-Doped Ferrihydrite: Pathways of Arsenic Mobilization and Sequestration. EPA STAR Fellowship Conference. Washington, D.C.

Kocar B.D. and Inskeep W.P.. (2003). Photochemically Induced Oxidation of Arsenite in Ferrioxalate Solutions. Proceedings of the American Association for the Advancement of Science-Pacific Division. 84th Annual Meeting, San Francisco, CA.

Inskeep, W.P., Langner, H.W., Macur, R.E., Kocar B.D., and McDermott, T.R. (2002) Microbial-Surface Interactions: Geochemical Processes and Microbial Populations Controlling S, Fe and As Cycling in Acid-Sulfate Geothermal Springs. For American Chemical Society.

Kocar B.D., Macur R.E., and Inskeep W.P. (2000). Photochemically Induced Oxidation of Arsenite in the Presence of Fe(III) and Oxalate. For Soil Science Society of America annual meeting, Minneapolis, MN.

Prior Experience

Visiting Professor, Dept of CEE, Massachusetts Institute of Technology, 2018-present

Assistant Professor, Dept of CEE, Massachusetts Institute of Technology, 2014-2018

8Member, MIT-NIH Center for Environmental Health Sciences, 2016-2018

Private Consulting, Modeling Contaminant Fate and Transpor, 2017-2018

Guest Appointment, Woods Hole Oceanographic Institute, 2017-2018

Engineering Physicist, Stanford Synchrotron Radiation Lightsource, 2011-2014

Post-Doctoral Scholar, Environmental Biogeochemistry, Stanford University, 2008-2011

Graduate Student Appointment, Soil and Environmental Biogeochemistry (Stanford), 2002-2008

Graduate Student Appointment, Thermal Biology Institute, Montana State University, 2000-2002

Professional Affiliations

Reviewer for Scientific Journals: Environmental Science and Technology, Environmental Chemistry, Journal of Colloid and Interface Science, Science of the Total Environment, European Journal of Soil Sciences, Geochemical Transactions, Chemosphere, Applied Geochemistry, Geoderma, Geochimica et Cosmochimica Acta, Environmental Pollution, Frontiers in Microbial Geochemistry, Journal of Hazardous Materials, Nature Geoscience.

Reviewer for Funding Agencies: National Science Foundation-Geobiology and Low Temperature Geochemistry Program. Department of Energy, Program in Subsurface Biogeochemical Research. Department of Energy, Science Focus Areas for National Laboratory System.

Conference Sessions and Workshops Organized:

Co-Organizer: Biogeochemical Cycling of Metals, Radionuclides and Associated Colloids within Earth’s Critical Zone. For Goldschmidt Conference, 2018 (Boston).

Organizer: Biogeochemical Cycling of Nutrients and Contaminants in Physically Complex Environments. For American Chemical Society Meeting, 2015 (Boston).

Organizer: Emerging Metal Contaminants in Soils and Natural Waters. For Soil Science Society of America Annual Meeting. 2014 (Long Beach). Co-Organizer and Instructor: Use of X-rays in Cultural Heritage, Stanford Synchrotron Radiation Users Meeting, 2013.

Member of Professional Societies: Soil Science Society of America, American Chemical Society, American Geophysical Union, Mineralogical Society of America

Service at MIT (while an assistant professor): Undergraduate Curriculum Committee, CEE. Responsible for reviewing and evaluating undergraduate curriculum and ensuring adherence to Accreditation Board for Engineering and Technology (ABET). Attended ABET workshop in Baltimore, MD for ensuring continued accreditation. Freshman Admissions Committee: reviewed applications for undergraduate admittance to the institute. Committee on Radiation Protection: Appointed to review and approve use of ionizing and non-ionizing radiation sources, risk assessment, and monitoring.

Project Experience

Provided guest lectures for a provincial land construction engineering group in China, and discussed strategies for remediating large tracts (thousands of hectares) of saline/sodic soils, some contaminated with potentially toxic metal(loid)s.

Discussed strategies with a Chinese company for transforming massive quantities of algal biomass harvested from a large eutrophic lake into a valuable commodity, such as nutrient-enriched biochar, for use in agricultural systems.

Member of Beamline Advisory Committee (BAT) for planning the construction of a hard X-ray microprobe, National Synchrotron Radiation Lightsource-II.

Other field experience: Extensive experience in challenging field environments (e.g., rural Cambodia). Well nest, piezometer, and lysimeter installation, sediment coring, pore- and surface-water sampling. Field protocols for collecting ground- and surface-water, measuring dissolved aqueous constituents (e.g. YSI probes for pH/eH/temp/conductivity/DO and colorimetric assays), basic surveying (use of autolevel), use of UAV’s for collecting remote sensing data, including RGB (standard photography/mapping), NDVI (“plant health”), Far-IR (mapping field-scale temperature variation, estimating soil moisture through measuring thermal inertia). Used TDR, neutron probe, and gypsum devices for measuring soil moisture, and used pressure transducers for water level monitoring. Trace gas measurements using flux chambers. FAA license for UAV operation.

Other Skills

(Bio)Geochemical, Groundwater and Reactive Transport Models: MIN3P, Crunchflow, PHREEQC, Geochemist Workbench, MINTEQ, MODFLOW.

Computer Languages and Other Software Packages: Intermediate Proficiency (for data analysis and instrument control): Python. Basic Proficiency (for data analysis and modifying pre-existing code): R, C, FORTRAN.

Conventional Instrumentation: ICP-MS/OES, IC, AA, GC-MS, MIMS/RGA, SEM, TEM, Electron Microprobe, ICP-DRIE (clean-room microfluidic device fabrication), XRD (powder), FTIR, XPS, Microscopy—Standard, Fluorescence, Confocal. Microwave digestion.

Advanced Instrumentation: Numerous synchrotron-based techniques for solid phase speciation analysis (XRF mapping, confocal XRF mapping, XANES/EXAFS, NEXAFS, s-XRD) for understanding contaminant dynamics in soils and sediments. Fourier Transform Ion Cyclotron Resonance (FTICR) for identifying compounds within complex organic and inorganic mixtures.

Knowledge

CREDENTIALS & PROFESSIONAL HONORS

  • Ph.D., Geological and Environmental Science, Stanford University
  • M.S., Land Resources and Environmental Chemistry, Montana State University, 2002
  • B.S., Chemistry-Biochemistry, Montana State University, 2000
  • B.S., Soil and Environmental Science, Montana State University, 2000
  • SSSA Emil Truog Award for Best PhD Dissertation in Soil Science, 2009 

    U. S. EPA STAR Graduate Fellowship, 2004-2007 

    Best Graduate Student Presentation: 84th Meeting of AAAS-Pacific Division, 2003 

    J. Thomas Dutro, Jr. Award for Excellence in the Geosciences, AAAS, 2003 

    Graduate Student Fellowship: Montana State University Thermal Biology Institute, 2000-2002