PNNL

Thomas Wietsma is an Earth Scientist with the Plant and Ecosystem Phenotyping team in the Environmental Molecular Sciences Division and the Environmental Molecular Sciences Laboratory (EMSL) user program. His research focuses on multi-scale flow and transport and chemical analysis. He is associated with the Subsurface Flow and Transport Experimental Facility in EMSL. He is currently responsible for subsurface flow and transport experimental studies from the pore scale in microfluidic devices to meter scale in columns and flow cells. He also manages the analytical support laboratory which includes GC-MS, ICP-MS, TC/TN, elemental analysis CHNS/O and IC. 

Multi-scale flow and transport

• BS in Geology and Chemistry, Calvin University, 1992 

• American Geophysical Union

2020 

Bhattacharjee A., D. Velickovic, T.W. Wietsma, S.L. Bell, J.K. Jansson, K.S. Hofmockel, and C.R. Anderton. 2020. "Visualizing Microbial Community Dynamics Via a Controllable Soil Environment." mSystems 5, no. 1:Article No. e00645-19. PNNL-SA-147223. doi:10.1128/mSystems.00645-19 

Boiteau R.M., R.K. Kukkadapu, J.B. Cliff, C.R. Smallwood, L. Kovarik, M.G. Wirth, and M.H. Engelhard, et al. 2020. "Calcareous organic matter coatings sequester siderophores in alkaline soils." Science of the Total Environment 724. PNNL-SA-147851. doi:10.1016/j.scitotenv.2020.138250 

Ogden A.J., T.W. Wietsma, T.E. Winkler, Y. Farris, G.L. Myers, and A. Ahkami. 2020. "Dynamics of Global Gene Expression and Regulatory Elements in Growing Brachypodium Root System." Scientific Reports 10. PNNL-SA-145907. doi:10.1038/s41598-020-63224-z 

2019 

Ahkami A., W. Wang, T.W. Wietsma, T.E. Winkler, I. Lange, G.C. Jansson, and M.D. Lange, et al. 2019. "Metabolic shifts associated with drought-induced senescence in Brachypodium." Plant Science 289. PNNL-SA-145496. doi:10.1016/j.plantsci.2019.110278 

2018 

Popel A., T.W. Wietsma, M.H. Engelhard, A. Lea, O. Qafoku, C. Grygiel, and I. Monnet, et al. 2018. "The Effect of Ion Irradiation on the Dissolution of UO2 and UO2-based Simulant Fuel." Journal of Alloys and Compounds 735. PNNL-SA-129551. doi:10.1016/j.jallcom.2017.11.216 

Rockhold M.L., F.A. Spane, T.W. Wietsma, D.R. Newcomer, R.E. Clayton, D.I. Demirkanli, and D.L. Saunders, et al. 2018. Physical and Hydraulic Properties of Sediments from the 200-DV-1 Operable Unit. PNNL-27846. Richland, WA: Pacific Northwest National Laboratory. 

Wang Y., N. Wei, C. Zhang, T.W. Wietsma, A.H. Bonneville, X. Li, and M. Li, et al. 2018. "Experimental study of drying effects during supercritical CO2 displacement in a pore network." Microfluidics and Nanofluidics 22, no. 9:101. PNNL-SA-137617. doi:10.1007/s10404-018-2122-9 

2017 

Childers M.I., M. Nguyen, K.A. Rod, P.K. Koech, W. Um, J. Chun, and V. Glezakou, et al. 2017. "Polymer-Cement Composites with Self-Healing Ability for Geothermal and Fossil Energy Applications." Chemistry of Materials 29, no. 11:4708-4718. PNNL-SA-127162. doi:10.1021/acs.chemmater.7b00344 

Childers M.I., M.C. Endres, C.A. Burns, B.J. Garcia, J. Liu, T.W. Wietsma, and A.H. Bonneville, et al. 2017. "Novel Highly Dispersible, Thermally Stable Core/Shell Proppants for Geothermal Applications." Geothermics 70. PNNL-SA-121506. doi:10.1016/j.geothermics.2017.05.013 

Maddi B., E.A. Panisko, T.W. Wietsma, T.L. Lemmon, M.S. Swita, K.O. Albrecht, and D.T. Howe. 2017. "Quantitative Characterization of Aqueous Byproducts from Hydrothermal Liquefaction of Municipal Wastes, Food Industry Wastes, and Biomass Grown on Waste." ACS Sustainable Chemistry & Engineering 5, no. 3:2205-2214. PNNL-SA-121413. doi:10.1021/acssuschemeng.6b02367 

2016 

Chang C., Q. Zhou, T.J. Kneafsey, M. Oostrom, T.W. Wietsma, and Q. Yu. 2016. "Pore-Scale Supercritical CO2 Dissolution and Mass Transfer under Imbibition Conditions." Advances in Water Resources 92. PNNL-SA-117137. doi:10.1016/j.advwatres.2016.03.015 

Maddi B., E.A. Panisko, T.W. Wietsma, T.L. Lemmon, M.S. Swita, K.O. Albrecht, and D.T. Howe. 2016. "Quantitative Characterization of the Aqueous Fraction from Hydrothermal Liquefaction of Algae." Biomass & Bioenergy 93. PNNL-SA-113775. doi:10.1016/j.biombioe.2016.07.010 

Moore J.S., S.S. Xantheas, J.W. Grate, T.W. Wietsma, E. Gratton, and A. Vasdekis. 2016. "Modular Polymer Biosensors by Solvent Immersion Imprint Lithography." Journal of Polymer Science. Part B, Polymer Physics 54, no. 1:98-103. PNNL-SA-112121. doi:10.1002/polb.23961 

Oostrom M., Y. Mehmani, P. Romero Gomez, Y. Tang, H. Liu, H. Yoon, and Q. Kang, et al. 2016. "Pore-scale and Continuum Simulations of Solute Transport Micromodel Benchmark Experiments." Computational Geosciences 20, no. 4:857-879. PNNL-SA-100394. doi:10.1007/s10596-014-9424-0 

2015 

Panisko E.A., T.W. Wietsma, T.L. Lemmon, K.O. Albrecht, and D.T. Howe. 2015. "Characterization of the Aqueous Fractions from Hydrotreatment and Hydrothermal Liquefaction of Lignocellulosic Feedstocks." Biomass & Bioenergy 74. PNNL-SA-105768. doi:10.1016/j.biombioe.2015.01.011 

Scheibe T.D., W.A. Perkins, M.C. Richmond, M.I. McKinley, P. Romero Gomez, M. Oostrom, and T.W. Wietsma, et al. 2015. "Pore-Scale and Multiscale Numerical Simulation of Flow and Transport in a Laboratory-Scale Column." Water Resources Research 51, no. 2:1023-1035. PNNL-SA-103382. doi:10.1002/2014WR015959 

Truex M.J., V.R. Vermeul, D. Adamson, M. Oostrom, L. Zhong, R.D. Mackley, and B.G. Fritz, et al. 2015. "Field Test of Enhanced Remedial Amendment Delivery Using a Shear-Thinning Fluid." Ground Water Monitoring and Remediation 35, no. 3:34-45. PNNL-SA-101736. doi:10.1111/gwmr.12101 

2014 

Oostrom M., and T.W. Wietsma. 2014. Intermediate-Scale Laboratory Experiments of Subsurface Flow and Transport Resulting from Tank Leaks. PNNL-23586. Richland, WA: Pacific Northwest National Laboratory. Intermediate-Scale Laboratory Experiments of Subsurface Flow and Transport Resulting from Tank Leaks 

Oostrom M., M.J. Truex, T.W. Wietsma, and G.D. Tartakovsky. 2014. "Pore-Water Extraction from Unsaturated Porous Media: Intermediate-Scale Laboratory." Vadose Zone Journal 13, no. 8. PNNL-SA-102165. doi:10.2136/vzj2014.04.0044 

Oostrom M., M.J. Truex, V.R. Vermeul, L. Zhong, G.D. Tartakovsky, and T.W. Wietsma. 2014. "Remedial Amendment Delivery near the Water Table Using Shear Thinning Fluids: Experiments and Numerical Simulations." Environmental Processes 1, no. 4:331-351. PNNL-SA-103590. doi:10.1007/s40710-014-0031-9 

Wunschel D.S., H.E. Engelmann, K.D. Victry, B.H. Clowers, C.M. Sorensen, N.B. Valentine, and C.M. Mahoney Fahey, et al. 2014. "Protein markers for identification of Yersinia pestis and their variation related to culture." Molecular and Cellular Probes 28, no. 2-3:65-72. PNNL-SA-96155. doi:10.1016/j.mcp.2013.12.001 

2013 

Fanizza M.F., H. Yoon, C. Zhang, M. Oostrom, T.W. Wietsma, N.J. Hess, and M.E. Bowden, et al. 2013. "Pore-Scale Evaluation of Uranyl Phosphate Precipitation in a Model Groundwater System." Water Resources Research 49, no. 2:874-890. PNNL-SA-91344. doi:10.1002/wrcr.20088 

Grate J.W., M.G. Warner, J.W. Pittman, K.J. Dehoff, T.W. Wietsma, C. Zhang, and M. Oostrom. 2013. "Silane Modification of Glass and Silica Surfaces to Obtain Equally Oil-Wet Surfaces in Glass-Covered Silicon Micromodel Applications." Water Resources Research 49, no. 8:4724-4729. PNNL-SA-90520. doi:10.1002/wrcr.20367 

Johnson T.C., M. Oostrom, M.J. Truex, J.N. Thomle, and T.W. Wietsma. 2013. "Determination of water saturation using gas phase partitioning tracers and time-lapse electrical conductivity measurements." Vadose Zone Journal 12, no. 2. PNNL-SA-91015. doi:10.2136/vzj2012.0142 

Truex M.J., M. Oostrom, T.W. Wietsma, G.V. Last, and D.C. Lanigan. 2013. Pore-Water Extraction Scale-Up Study for the SX Tank Farm. PNNL-21882; RPT-DVZ-AFRI-011. Richland, WA: Pacific Northwest National Laboratory. Pore-Water Extraction Scale-Up Study for the SX Tank Farm 

Wang Y., C. Zhang, N. Wei, M. Oostrom, T.W. Wietsma, X. Li, and A. Bonneville. 2013. "Experimental study of crossover from capillary to viscous fingering for supercritical CO2 - water displacement in a homogeneous pore network." Environmental Science & Technology 47, no. 1:212-218. PNNL-SA-87244. doi:10.1021/es3014503 

2012 

Amonette J.E., P.M. Jeffers, O. Qafoku, C.K. Russell, D.R. Humphrys, T.W. Wietsma, and M.J. Truex. 2012. Abiotic degradation rates for carbon tetrachloride and chloroform: Final report. PNNL-22062; RPT-DVZ-AFRI-012. Richland, WA: Pacific Northwest National Laboratory. Abiotic degradation rates for carbon tetrachloride and chloroform: Final report. 

Grate J.W., K.J. Dehoff, M.G. Warner, J.W. Pittman, T.W. Wietsma, C. Zhang, and M. Oostrom. 2012. "Correlation of Oil-Water and Air-Water Contact Angles of Diverse Silanized Surfaces and Relationship to Fluid Interfacial Tensions." Langmuir 28, no. 18:7182-7188. PNNL-SA-83545. doi:10.1021/la204322k 

Oostrom M., K.V. Smoot, T.W. Wietsma, M.J. Truex, M.W. Benecke, and G.B. Chronister. 2012. "Vadose Zone Soil Moisture Wicking Using Super Absorbent Polymers." Vadose Zone Journal 11, no. 4. PNNL-SA-84832. doi:10.2136/vzj2011.0200 

Oostrom M., T.W. Wietsma, C.E. Strickland, V.L. Freedman, and M.J. Truex. 2012. "Sensor and numerical simulator evaluation for porous medium desiccation and rewetting at the intermediate laboratory scale." Vadose Zone Journal 11, no. 1:Article No. 0089. PNNL-SA-83396. doi:10.2136/vzj2011.0089 

Oostrom M., V.L. Freedman, T.W. Wietsma, J.H. Dane, and M.J. Truex. 2012. "Effects of Porous Medium Heterogeneity on Vadose Zone Desiccation: Intermediate-scale Laboratory Experiments and Simulations." Vadose Zone Journal 11, no. 4. PNNL-SA-84135. doi:10.2136/vzj2011.0168 

2011 

Oostrom M., G.D. Tartakovsky, T.W. Wietsma, M.J. Truex, and J.H. Dane. 2011. "Determination of Water Saturation in Relatively Dry Porous Media Using Gas-phase Tracer Tests." Vadose Zone Journal 10, no. 2:634-641. PNNL-SA-74637. 

Oostrom M., V.L. Freedman, T.W. Wietsma, and M.J. Truex. 2011. Pore-Water Extraction Intermediate-Scale Laboratory Experiments and Numerical Simulations. PNNL-20507. Richland, WA: Pacific Northwest National Laboratory. Pore-Water Extraction Intermediate-Scale Laboratory Experiments and Numerical Simulations 

Truex M.J., M. Oostrom, V.L. Freedman, C.E. Strickland, T.W. Wietsma, G.D. Tartakovsky, and A.L. Ward. 2011. Laboratory and Modeling Evaluations in Support of Field Testing for Desiccation at the Hanford Site. PNNL-20146. Richland, WA: Pacific Northwest National Laboratory. Laboratory and Modeling Evaluations in Support of Field Testing for Desiccation at the Hanford Site 

Truex M.J., T. Macbeth, V.R. Vermeul, B.G. Fritz, D.P. Mendoza, R.D. Mackley, and T.W. Wietsma, et al. 2011. "Demonstration of Combined Zero-Valent Iron and Electrical Resistance Heating for In Situ Trichloroethene Remediation." Environmental Science & Technology 45, no. 12:5346-5351. PNNL-SA-76701. doi:10.1021/es104266a 

Truex M.J., V.R. Vermeul, D.P. Mendoza, B.G. Fritz, R.D. Mackley, M. Oostrom, and T.W. Wietsma, et al. 2011. "Injection of Zero Valent Iron into an Unconfined Aquifer Using Shear-Thinning Fluids." Ground Water Monitoring and Remediation 31, no. 1:50-58. PNNL-SA-70324. 

Zhang C., M. Oostrom, J.W. Grate, T.W. Wietsma, and M.G. Warner. 2011. "Liquid CO2 Displacement of Water in a Dual-Permeability Pore Network Micromodel." Environmental Science & Technology 45, no. 17:7581-7588. PNNL-SA-81215. doi:10.1021/es201858r 

Zhang C., M. Oostrom, T.W. Wietsma, J.W. Grate, and M.G. Warner. 2011. "Influence of Viscous and Capillary Forces on Immiscible Fluid Displacement: Pore-Scale Experimental Study in a Water-Wet Micromodel Demonstrating Viscous and Capillary Fingering." Energy and Fuels 25, no. 8:3493-3505. PNNL-SA-79115. doi:10.1021/ef101732k 

2010 

Amonette J.E., P.M. Jeffers, O. Qafoku, C.K. Russell, D.R. Humphrys, T.W. Wietsma, and M.J. Truex. 2010. Abiotic Degradation Rates for Carbon Tetrachloride and Chloroform: Progress in FY 2010. PNNL-20044. Richland, WA: Pacific Northwest National Laboratory. Abiotic Degradation Rates for Carbon Tetrachloride and Chloroform: Progress in FY 2010 

Amonette J.E., P.M. Jeffers, O. Qafoku, C.K. Russell, T.W. Wietsma, and M.J. Truex. 2010. Abiotic Degradation Rates for Carbon Tetrachloride and Chloroform: Progress in FY2009. PNNL-19142. Richland, WA: Pacific Northwest National Laboratory. Abiotic Degradation Rates for Carbon Tetrachloride and Chloroform: Progress in FY2009 

Grate J.W., C. Zhang, T.W. Wietsma, M.G. Warner, N.C. Anheier, B.E. Bernacki, and G. Orr, et al. 2010. "A note on the visualization of wetting film structures and a nonwetting immiscible fluid in a pore network micromodel using a solvatochromic dye." Water Resources Research 46. PNNL-SA-71572. doi:10.1029/2010WR009419 

Oostrom M., M.J. Truex, G.D. Tartakovsky, and T.W. Wietsma. 2010. "Three-Dimensional Simulation of Volatile Organic Compound Mass Flux from the Vadose Zone to Groundwater." Ground Water Monitoring and Remediation 30, no. 3:45-56. PNNL-SA-68431. doi:10.1111/j.1745-6592.2010.01285.x 

Oostrom M., M.J. Truex, G.D. Tartakovsky, and T.W. Wietsma. 2010. "Three-Dimensional Simulation of Volatile Organic Compound Mass Flux from the Vadose Zone to Groundwater." Ground Water Monitoring and Remediation 30, no. 3:45-56. PNNL-SA-70865. 

Truex M.J., M. Oostrom, Z.F. Zhang, K.C. Carroll, J.A. Schramke, T.W. Wietsma, and G.D. Tartakovsky, et al. 2010. Evaluation of Soil Flushing for Application to the Deep Vadose Zone in the Hanford Central Plateau. PNNL-19938. Richland, WA: Pacific Northwest National Laboratory. Evaluation of Soil Flushing for Application to the Deep Vadose Zone in the Hanford Central Plateau 

Willingham T.W., C. Zhang, C.J. Werth, A.J. Valocchi, M. Oostrom, and T.W. Wietsma. 2010. "Using Dispersivity Values to Quantify the Effects of Pore-Scale Flow Focusing on Enhanced Reaction along a Transverse Mixing Zone." Advances in Water Resources 33, no. 4:525-535. PNNL-SA-70933. doi:10.1016/j.advwatres.2010.02.004 

Zhang C., K.J. Dehoff, N.J. Hess, M. Oostrom, T.W. Wietsma, A.J. Valocchi, and B.W. Fouke, et al. 2010. "Pore-Scale Study of Transverse Mixing Induced CaCO3 Precipitation and Permeability Reduction in a Model Subsurface Sedimentary System." Environmental Science & Technology 44, no. 20:7833-7838. PNNL-SA-73959. doi:10.1021/es1019788 

2009 

Amonette J.E., O. Qafoku, T.W. Wietsma, P.M. Jeffers, C.K. Russell, and M.J. Truex. 2009. Carbon Tetrachloride and Chloroform Attenuation Parameter Studies: Heterogeneous Hydrolytic Reactions -- Status Report. PNNL-18735. Richland, WA: Pacific Northwest National Laboratory. Carbon Tetrachloride and Chloroform Attenuation Parameter Studies: Heterogeneous Hydrolytic Reactions -- Status Report 

Oostrom M., T.W. Wietsma, J.H. Dane, M.J. Truex, and A.L. Ward. 2009. "Desiccation of unsaturated porous media: Intermediate-scale experiments and numerical simulation." Vadose Zone Journal 8, no. 3:643-650. PNNL-SA-64019. 

Szecsody J.E., M.L. Rockhold, M. Oostrom, R.C. Moore, C.A. Burns, M.D. Williams, and L. Zhong, et al. 2009. Sequestration of Sr-90 Subsurface Contamination in the Hanford 100-N Area by Surface Infiltration of a Ca-Citrate-Phosphate Solution. PNNL-18303. Richland, WA: Pacific Northwest National Laboratory. Sequestration of Sr-90 Subsurface Contamination in the Hanford 100-N Area by Surface Infiltration of a Ca-Citrate-Phosphate Solution 

Wietsma T.W., M. Oostrom, M.A. Covert, T.E. Queen, and M.J. Fayer. 2009. "An automated tool for three types of saturated hydraulic conductivity laboratory measurements." Soil Science Society of America Journal 73, no. 2:466-470. PNNL-SA-59658. 

Yoon H., M. Oostrom, T.W. Wietsma, C.J. Werth, and A.J. Valocchi. 2009. "Numerical and experimental investigation of DNAPL removal mechanisms in a layered porous medium by means of soil vapor extraction." Journal of Contaminant Hydrology 109, no. 1-4:1-13. PNNL-SA-64091. doi:10.1016/j.jconhyd.2009.07.001 

2008 

Amonette J.E., P.M. Jeffers, O. Qafoku, C.K. Russell, T.W. Wietsma, and M.J. Truex. 2008. Abiotic Degradation Rates for Carbon Tetrachloride: and Chloroform: Progress in FY 2008. PNNL-18020. Richland, WA: Pacific Northwest National Laboratory. Abiotic Degradation Rates for Carbon Tetrachloride: and Chloroform: Progress in FY 2008 

Zhong L., M. Oostrom, T.W. Wietsma, and M.A. Covert. 2008. "Enhanced Remedial Amendment Delivery through Fluid Viscosity Modifications: Experiments and numerical simulations." Journal of Contaminant Hydrology 101, no. 1-4:29-41. PNNL-SA-59438. doi:10.1016/j.jconhyd.2008.07.007 

2007 

Istok J.D., M.M. Park, A.D. Peacock, M. Oostrom, and T.W. Wietsma. 2007. "An experimental investigation of nitrogen gas produced during denitrification." Ground Water 45, no. 4:461-467. PNNL-SA-53488. 

Oostrom M., J.H. Dane, and T.W. Wietsma. 2007. "A Review of Multidimensional, Multifluid Intermediate-scale Experiments: Flow Behavior, Saturation Imaging, and Tracer Detection and Quantification." Vadose Zone Journal 6, no. 3:610-637. PNNL-SA-55643. doi:10.2136/vzj2006.0178 

Oostrom M., M.J. Truex, P.D. Thorne, and T.W. Wietsma. 2007. "Three-Dimensional Multifluid Flow and Transport at the Brooklawn Site near Baton Rouge, LA: A Case Study." Soil & Sediment Contamination 16, no. 2:109-141. PNWD-SA-7319. 

Oostrom M., T.W. Wietsma, M.A. Covert, and V.R. Vermeul. 2007. "Zero-valent Iron Emplacement in Permeable Porous Media Using Polymer Additions." Ground Water Monitoring and Remediation 27, no. 1:122-130. PNNL-SA-52567. 

2006 

Oostrom M., C. Hofstee, and T.W. Wietsma. 2006. "Behavior of a Viscous LNAPL under Variable Water Table Conditions." Soil & Sediment Contamination 15, no. 6:543 - 564. PNNL-SA-46807. doi:10.1080/15320380600958976 

Oostrom M., C. Hofstee, and T.W. Wietsma. 2006. "LNAPLs do not Always Float: An Example Case of a Viscous LNAPL under Variable Water Table Conditions." In 26th Annual American Geophysical Union Hydrology Days, March 20-22, 2006, edited by J.A. Ramirez, 119-130. Fort Collins, Colorado:Colorado State University. PNNL-SA-48870. LNAPLs do not Always Float: An Example Case of a Viscous LNAPL under Variable Water Table Conditions 

Oostrom M., J.H. Dane, and T.W. Wietsma. 2006. "A Review of Multidimensional, Multifluid Intermediate-scale Experiments: Nonaqueous Phase Liquid Dissolution and Enhanced Remediation." Vadose Zone Journal 5. PNNL-SA-47245. doi:10.2136/vzj2005.0125 

Oostrom M., T.W. Wietsma, M.A. Covert, and V.R. Vermeul. 2006. "Micron-Size Zero-Valent Iron Emplacement in Porous Media Using Polymer Additives: Column and Flow Cell Ex-periments." In 26th Annual American Geophysical Union Hydrology Days Conference Proceedings, March 20-22, 2006, Colorado State University, edited by J.A. Ramirez, 131-139. Fort Collins, Colorado:Colorado State University. PNNL-SA-48855. Micron-Size Zero-Valent Iron Emplacement in Porous Media Using Polymer Additives: Column and Flow Cell Experiments 

2005 

Oostrom, M., J.H. Dane, and T.W. Wietsma. 2005. Removal of carbon tetrachloride from a layered porous medium by means of soil vapor extraction enhanced by desiccation and water table reduction Vadose Zone J. 4: 1170-1182. 

Laskin A, T.W. Wietsma, B.J. Krueger, and V.H. Grassian. 2005. Heterogeneous chemistry of individual mineral dust particles with nitric acid: A combined CCSEM/EDX, ESEM, and ICP-MS study. Journal of Geophysical research-atmospheres 110 (D10): Art. No. D10208. 

Oostrom, M., M.D. White, Lenhard, R.J., P. van Geel, and T.W. Wietsma. 2005. Comparison of NAPL residual formation theoretical models. Vadose Zone Journal. 4: 163-174. 

2003  

Oostrom M., P.D. Thorne, M.D. White, M.J. Truex, and T.W. Wietsma. 2003. Numerical modeling to assess DNAPL movement and removal at the Scenic Site Operable Unit near Baton Rouge, Louisiana: A case study. J. of Soil and Sediment Contamination. 12 (6): 901-926  

Oostrom, M., C. Hofstee, R.J. Lenhard, and T.W. Wietsma. 2003. Flow behavior and residual saturation formation of injected carbon tetrachloride in unsaturated heterogeneous porous media. J. of Contaminant Hydrology. 64: 93-112. 

2001 

Oostrom, M., C. Hofstee, R.J. Lenhard, and T.W. Wietsma. 2001. In-situ oxidation of trichloroethene by permanganate: effects on porous medium hydraulic properties  J. of Contaminant Hydrology. 50: 79-98. 

2000 

Brusseau M.L. , N.T. Nelson, M. Oostrom, Z. Zhang, G.R. Johnson, and T.W. Wietsma. 2000 Influence of Heterogeneity and Sampling Method on Aqueous Concentrations Associated with NAPL Dissolution.  Environmental Science and Technology, 34 (17), 3657 -3664. 

Oostrom, M., J.H. Dane, and T.W. Wietsma. 2000. Gamma Radiation Techniques in Subsurface Multifluid Flow and Transport Studies. American Society of Mechanical Engineers Journal  Paper 11194: 1-7. 

 1999 

Nelson N.T., M. Oostrom, T.W. Wietsma, and M.L . Brusseau. 1999 Partitioning tracer method for the in situ measurement of DNAPL saturation: Influence of heterogeneity and sampling method.  Environmental Science and Technology, 33 (22), 4046 -4053. 

 1997 

Murphy EM, T.R. Ginn, A. Chilakapati A, C.T. Resch , J.L. Phillips , T.W. Wietsma, and C.M. Spadoni. 1997  The influence of physical heterogeneity on microbial degradation and distribution in porous media.  Water Resources Research 33 (5): 1087-1103. 

 1996 

Muyskens MA, S.V. Glass, T.W. Wietsma, and T.M. Gray. 1996  Data acquisition in the chemistry laboratory using LabVIEW software.  Journal of Chemical Education 73 (12): 1112-1114. 

Kaplan D.I, K.J. Cantrell, T.W. Wietsma, and M.A. Potter. 1996. Retention of zero-valent iron colloids by sand columns: Application to chemical barrier formation. J. of Environmental Quality. 25 (5): 1086-1094 

 1995 

Cantrell K.J, D.I. Kaplan, and T.W. Wietsma. 1995. Zero-valent iron for the in-situ remediation of selected metals in ground water. J. of Hazardous Materials. 42 (2): 201-212. 

 1994 

Murphy EM, J.M. Zachara, S.C. Smith, J.L. Phillips, and T.W. Wietsma. 1994  Interaction of hydrophobic organic-compounds with mineral-bound humic substances. Environmental Science and Technology, 28 (7): 1291-1299.