Ph.D.:  Environmental Geoscience-Environmental Toxicology, Michigan State University, 2002 

Research interests:

• Environmental biogeochemistry
• Coupled biogeochemical cycles in anaerobic terrestrial and aquatic environments
• Low-temperature aqueous geochemistry
• Chemical fate and transport
• Applied environmental toxicology
• Reactive multi-phase numerical modeling
• Quantifying the means by which hydrogeologic, microbiologic, and geochemical processes combine to drive spatial and temporal variability in elemental cycles is a fundamental issue in addressing environmental concerns related to human health and long-term ecological sustainability. The biogeochemical cycling (fate and transport) of numerous chemical species, including nutrients and anthropogenic contaminants, are controlled by changes in the reduction-oxidation potential or redox state of a system. Many redox reactions including the degradation of organic contaminants and nutrient cycles are mediated by the metabolic activities of microorganisms. Microbial metabolism, through a series of terminal electron accepting processes (TEAPs), impacts the form, mobility, toxicity and persistence of many chemical constituents in aqueous systems. My research focuses on understanding the controls on the spatial and temporal variability of TEAPs which is necessary to evaluate health and safety concerns such as: chemical routes of exposure (risk assessment), natural attenuation and bioremediation capabilities, and the management of redox sensitive environments such as wetlands and estuaries.

Courses:

• GEOL 111: Introductory Physical Geology
• GEOL 161/461:  Medical Geology 
• GEOL 310: Environmental Geochemistry
• ESCI   310: Environmental Problem Solving 
• GEOL 410: Hydrogeology

Projects:

• MPCA- Field Studies of Chemical and Microbiological Controls on Biodegradation Rates of Crude Oil in Aquifer and Wetland Systems.  Bemidji, MN.
• NSF-Biocomplexity in the Environment Quantifying the Role of Mixing Interfaces in Biogeochemical Cycling in a Contaminated Aquifer-Wetland System: Linking Hydrogeological, Microbiological, and Geochemical Processes.
• NSF-Hydrological Sciences-Flow-Induced Redox Geochemistry within Fractured/Macroporous and Layered Vadose Zone

Funded Proposals:

05/12  National Crude Oil Spill Fate and Natural Attenuation Research Site, a collaborative venture of the USGS, Enbridge Energy, Limited Partnership, the Minnesota Pollution Control agency, and Beltrami County:  Field studies of physical and biogeochemical controls on fate and transport of hydrocarbons (BTEX and ethanol) in subsurface systems ($10,053)

05/11 Minnesota Pollution Control Agency:  Field studies of physical and biogeochemical controls on fate and transport of hydrocarbons (BTEX and ethanol) in subsurface systems ($10,042)

05/10 Minnesota Pollution Control Agency:  Field Studies of Chemical and Microbiological Controls on Biodegradation Rates of BTEX in Aquifer and Wetland systems ($9,995)

05/07 NSF-Hydrological Sciences-“Flow-Induced Redox Geochemistry within Fractured/Macroporous and Layered Vadose zone” Co-PI with Binayak Mohanty ($480,000)

10/04 NSF-Biocomplexity in the Environment: Coupled Biogeochemical Cycles “Quantifying the Role of Mixing Interfaces in a Contaminated Aquifer-Wetland System:  Linking Hydrogeological, Microbiological, & Geochemical Processes” With Co-PIs I.M. Cozzarelli, M.A. Voytek, and M.S. Phanikumar ($1,064,000).

07/03 Center for Environmental and Rural Health-NIH.  “Correlating Biogeochemical Processes at Mixing Interfaces within a Contaminated Aquifer-Wetland System ($25,000)

05/03  Texas Water Resources Institute.  “Instrumentation to Measure Evolution of Gases from Subsurface Flow Constructed Wetlands” ($10,000)

Peer-Reviewed Publications: (*indicated graduate student author)

*Arora, B., B. P. Mohanty, and J. T. McGuire (2011), Uncertainty in dual permeability model parameters for structured soils, Water Resources Research, 48, W01524, doi: 10.1029/2011WR010500

 *Hansen, D.J., McGuire, J.T., and Mohanty, B.M. (2011) Enhanced biogeochemical cycling and subsequent reduction of hydraulic conductivity associated with soil-layer interfaces in the vadose zone.  Journal of Environmental Quality, 40 (6), 1941-1954, doi:10.2134/jeq2011.0112 Posted online 5 Oct. 2011

 *Arora, B., B. P. Mohanty, and J. T. McGuire (2011), Inverse Estimation of Parameters for Multi-Domain Flow Models with Different Macropore Densities, Water Resources Research, 47, W04512, doi:10.1029/2010WR009451. (Note: This publication was a featured article in EOS, Transactions of the American Geophysical Union)

 *Kneeshaw, T.A., McGuire, J.T., Cozzarelli, I.M., & Smith, E.W. (2011) Quantifying In Situ Rates of Sulfate Reduction in Response to Geochemical Perturbations.  Ground Water, p. 1-11.  doi: 10.1111/j.1745-6584.2010.00782.x 

 Phanikumar, M.S. and McGuire, J.T., (2010) A multi-species reactive transport model to estimate biogeochemical rates based on single-well, push-pull test data, Computers & Geosciences, 36, 997-1004

 *Baez-Cazull, S.E., McGuire, J.T., Cozzarelli I.M., and Voytek, M.A. (2008)  Determination of dominant biogeochemical processes in a contaminated aquifer-wetland system using multivariate statistical analyses. Journal of Environmental Quality 37(1), 30-46.

 *Kneeshaw, T.A. McGuire, J.T., Cazull, S.E.B., Smith, E.W., Cozzarelli, I.M. (2007)  Evaluation of sulfate reduction at experimentally induced mixing interfaces using small-scale push-pull tests in an aquifer-wetland system. Applied Geochemistry, special issue on Biogeochemical Gradients, 22, 2618-2629.

* Baez-Cazull, S.E., McGuire, J.T., Cozzarelli, I.M., Raymond. A. and Welsh, L., (2007) Centimeter-scale characterization of biogeochemical gradients at a wetland-aquifer interface using capillary electrophoresis. Applied Geochemistry, special issue on Biogeochemical Gradients, 22, 2664-2683.

Velbel, M.A., McGuire, J.T., and Madden, A.J., 2007, Scanning electron microscopy of garnet from southern Michigan soils:  Etching rates and inheritance of pre-glacial and pre-pedogenic grain-surface textures.  Chapter 15, Developments in Sedimentology, Volume 58; Heavy Minerals in Use, edited by Maria A. Mange and David T. Wright

McGuire, J.T., Long, D.T., Hyndman, D.W., 2004, Analysis of recharge induced geochemical change in a contaminated aquifer.  Ground Water, 43(4), 518-530.

Phanikumar, M. S., and McGuire, J.T. 2004, A 3D partial-equilibrium model to simulate coupled hydrogeological, microbiological, and geochemical processes in subsurface systems. Geophysical Research Letters 31 (LII503):1-4.

Haack, S.K., Fogarty, L.R., West, T.G., Alm, E.W., McGuire, J.T., Long, D.T., Hyndman, D.W., Forney, L.J., 2004, Changes in microbial community structure over spatial and temporal chemical gradients in a contaminated aquifer, Environmental Microbiology, 6(5), 438-448.

McGuire, J. T., Long, D.T., Klug, M.J., Haack, S.K., and Hyndman, D.W., 2002, Evaluating the behavior of oxygen, nitrate, and sulfate during recharge and quantifying reduction rates in a contaminated aquifer, Environmental Science and Technology, 36, 2693-2700.

McGuire, J. T., Smith, E. W., Long, D. T., Hyndman, D. W., Haack, S. K., Klug, M. J., and Velbel, M. A., 2000,  Temporal variations in parameters reflecting terminal-electron-accepting processes in an aquifer contaminated with waste fuel and chlorinated solvents, in K. Konhauser and G. Southam (eds.), Geomicrobiology - Technical Session 06, 110th Geological Society of America Annual Meeting.  Chemical Geology, 169:471-485. (Invited paper)

McGuire, J.T., Smith, E.W., Long, D.T., Hyndman, D.W., Haack, S.K., Kolak, J.J., Klug, M.J., Velbel, M.A., and Forney, L.J., 1999,  Temporal variations in biogeochemical processes that influence ground water redox zonation.  In Morganwalp, D.W., and Buxton, H.T., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the Technical Meeting, Charleston, South Carolina, March 8-12, 1999, USGS Water-Resources Investigations Report 99-4018C, 641-652.

AND

 Undergraduate Student Research Advising (University of St. Thomas):

• Brady Ziegler: (YS funded):  The effect of ethanol as a co-contaminant on transport of BTEX in anaerobic wetland systems (Summer 2012)
• Ryan Streitz: (YS funded):  Methanogenic biodegradation rates of crude-oil plumes with ethanol as a co-contaminant at the National Crude Oil Spill Fate and Natural Attenuation Research Site in Bemidji, MN (Summer 2012)
• Ben Ruhme: (YS funded):  Examination of Ethanol’s Effects on Biodegradation of Crude Oil in Wetlands under nitrate reducing conditions (Summer 2012)
• Brady Ziegler (CIG funded):  Examination of Aqueous Nutrients Found in the Pahranagat (Spring 2012)
• Ryan Strietz: (CIG funded):  Analysis of Water Chemistry in The Pahranagat Valley (Spring 2012)
• Matt Scott:  Lead levels in Minneapolis Community Gardens (Spring 2012)
• Alex West (Geology):  Water Budget for the Highland Lakes Water Supply Reservoirs in Central Texas, USA (Spring 2012)
• Ashela Richardson (Biology Co-mentor  (lead- Adam Kay), CBR funded):  Combining research and outreach in the UST Stewardship Garden: biodiversity, organic farming, and crop nutrient content (Spring 2012)
• Amanda Carella (Geology & English student): Education for Sustainability-STRYVE:  Sustainability Training for Youth in Vulnerable Environments (Fall 201)
• Luke Olson (Geology Student):  Biogeochemical controls on natural attenuation of crude oil released from an oil-pipeline burst in Bemidji, MN in a wetland environment. (Spring 2009-January 2012)
• Luke Olson (Geology Student):  Determination of water quality indicators along a transect of the Hudson Bay watershed using capillary electrophoresis (spring &summer 2011)
• Maverick Deschamp (Geology Student):  Uptake of lead from lead-shot ammunition by plants.  (Spring 2011)
• Mai Nhia Vang (ESCI student):  Biogeochemical controls on natural attenuation of crude oil released from an oil-pipeline burst in Bemidji, MN in a wetland environment. (begin May 2010-August 2010)
• Amanda Carella (Geology and English student):  Biogeochemical controls on natural attenuation of crude oil released from an oil-pipeline burst in Bemidji, MN in a wetland environment. (begin May 2010- August 2010)
• Matthew Fox (Geology student):  Biogeochemical controls on natural attenuation of crude oil released from an oil-pipeline burst in Bemidji, MN in a wetland environment. (begin May 2010- August 2010)
• Jacob Smokovitz (Geology Student):  Spatial Distribution of Chemicals Leaching from an Unlined Landfill in Norman, Oklahoma, USA. (Poster presented at UST Research Symposium, Spring 2009)
• Eric Skarman (Geology Student):  Trace metal concentrations in Minnesotan Wild Rice (Spring 2009)
• Rebecca Wratkowski (Environmental Science Student):  Biogeochemical controls on natural attenuation of crude oil released from an oil-pipeline burst near a wetland in Bemidji, MN. (May 2009-December 2009)