William Arnold

William Arnold

William Arnold

Distinguished McKnight University Professor, and Joseph T. and Rose S. Ling Professor, Department of Civil, Environmental, and Geo- Engineering


Civil Engineering Building
Room 167
500 Pillsbury Drive SE
Minneapolis, MN 55455


  • B.S., 1994, Massachusetts Institute of Technology, Chemical Engineering
  • M.S., 1995, Yale University, Chemical Engineering
  • Ph.D., 1999, The Johns Hopkins University, Environmental Engineering

Professional Background

  • Visiting Scientist, Woods Hole Oceanographic Institution, 2013-2014
  • Visiting Researcher, Eawag, The Swiss Federal Institute for Aquatic Science and Technology, 2006-2007
  • Associate Professor, Department of Civil Engineering, University of Minnesota, 2005-2010
  • Assistant Professor, Department of Civil Engineering, University of Minnesota, 1999-2005
Research Interests

Experts@Minnesota Google Scholar Citations ORCID

My research is focused on the fate of anthropogenic chemicals in natural and engineered systems. Most of my efforts are focused on identifying important transformation processes, understanding detailed reaction mechanisms, and determining reaction rates. My goals are to be able to predict contaminant fate in natural aquatic systems and to design remediation technologies to treat contaminated waters. Current efforts include studying the photochemical fate of pharmaceuticals and pesticides, studying reactions that occur at mineral surfaces, remediation techniques for fluorochemicals, detection of micropollutants in aquatic systems, assessment of disinfection byproduct precursors, and developing treatment systems for resource recovery.

Honors and Awards

Select Awards:

AEESP Master's Thesis Award (Advisor): 2003, 2010, 2013, 2019, 2021

AEESP Outstanding Publication Award: 2018

Top Paper 2015 from Environmental Science: Water Research & Technology: 2016

Arcadis/AEESP Frontier in Research Award: 2012 

Super Reviewer Award,  Environmental Science and Technology:   2013


Brezonik, P.L.; Arnold, W.A. 2022. Water Chemistry: The Chemical Processes and Composition of Natural and Engineered Aquatic Systems, 2nd edition, Oxford University Press. 976pp.

Brezonik, P.L.; Arnold, W.A. 2011. Water Chemistry: An Introduction to the Chemistry of Natural and Engineered Systems, Oxford University Press. 808 pp.

Selected Publications

Bhat, A.P., Mundhenke, T.F., Whiting, Q.T., Peterson, A.A., Pomerantz, W.C.K. Arnold, W.A. 2022. Tracking Fluorine during Aqueous Photolysis and Advanced UV Treatment of Fluorinated Phenols and Pharmaceuticals Using a Combined 19F-NMR, Chromatography, and Mass Spectrometry Approach. ACS Environmental Au, accepted.  https://doi.org/10.1021/acsenvironau.1c00057 Open Access.

Soroush, A., R.L. Penn, Arnold, W.A. 2022. Anisotropic Oxidative Growth Of Goethite-Coated Sand Particles In Column Reactors During 4-Chloronitrobenzene Reduction by Fe(II)/Goethite. Envrion. Sci.: Nano, 9, 275-288. https://doi.org/10.1039/D1EN00788B Open Access

Tong, Y., Berens, M.J., Ulrich, B.A., Bolotin, J., Strehlau, J.H., Hofstetter, T.B., Arnold, W.A. 2021. Exploring the utility of compound-specific isotope analysis for assessing ferrous iron-mediated reduction of RDX in the subsurface. Environ. Sci. Technol. 55(10), 6752-6763. https://doi.org/10.1021/acs.est.0c08420

Berens, M.J., Capel, P.D., Arnold, W.A. 2021. Neonicotinoid Insecticides in Surface Water, Groundwater, and Wastewater across Land Use Gradients and Potential Effects. Environ. Tox. Chem. 40(4) 1017-1033. https://doi.org/10.1002/etc.4959 Open Access.

 Bueno, I., Beaudoin, A., Arnold, W.A., Kim, T., Frankson, L.E., LaPara, T.M., Kanankege, K., Wammer, K.H., Singer, R.S. 2021. Quantifying and predicting antimicrobials and antimicrobial resistance genes in waterbodies through a multidisciplinary/holistic approach: A study in Minnesota, United States. Scientific Reports, 11 (1), 1-15. https://www.nature.com/articles/s41598-021-98300-5  Open access

Berens, M. J., Hofstetter, T. B., Bolotin, J., Arnold, W. A. 2020. Assessment of 2,4-Dinitroanisole Transformation Using Compound-Specific Isotope Analysis after in Situ Chemical Reduction of Iron Oxides. Environmental Science and Technology 54(9), 5520-5531. doi: 10.1021/acs.est.9b07616

Pati, S. G., Arnold, W. A. 2020. Comprehensive screening of quaternary ammonium surfactants and ionic liquids in wastewater effluents and lake sediments. Environmental Science: Processes and Impacts. 22(2), 430-441. doi: 10.1039/c9em00554d

Lombardo, S. M., Vindedahl, A. M., Arnold, W. A. 2020. Determination of Hydroxyl Radical Production from Sulfide Oxidation Relevant to Sulfidic Porewaters. ACS Earth and Space Chemistry. 4(2), 261-271. doi: 10.1021/acsearthspacechem.9b00297

Hora, P.I, Novak, P.J., Arnold, W.A. 2019. Photodegradation of pharmaceutical compounds in partially nitritated wastewater during UV irradiation. Environ Sci.: Wat. Res. Technol. 5, 897-909. doi: 10.1039/c8ew00714d

O’Connor, M., Helal, S.R., Latch, D.E., Arnold, W.A. 2019. Quantifying Photo-production of Triplet Excited States and Singlet Oxygen from Effluent Organic Matter. Water Res. 156, 23-33. doi: 10.1016/j.watres.2019.03.002

View Arnold's full publication list on Google Scholar.