William Arnold

William Arnold

William Arnold

Distinguished McKnight University Professor Joseph T. and Rose S. Ling Professor Associate Department Head, 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.


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

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

Berens, M.J., Ulrich, B.A., Strehlau, J.H., Hofstetter, T.B., Arnold, W.A. 2019. Mineral Identity, Natural Organic Matter, and Repeated Contaminant Exposures do not Affect the Carbon and Nitrogen Isotope Fractionation of 2,4-Dinitroanisole during Abiotic Reduction. Environ. Sci.: Processes Impacts, 21, 51-62. doi: 10.1039/C8EM00381E

Todey, S.A., Fallon, A.M., Arnold, W.A. 2018. Neonicotinoid insecticide hydrolysis and photolysis: Rates and residual toxicity. Environ. Toxicol. Chem. 37(11), 2797-2809. doi: 10.1002/etc.4256; (data set: 10.13020/D6XQ2S) Open Access

Kerrigan, J.F., Sandberg, K.D., Engstrom, D.R., LaPara, T.M., Arnold, W.A. 2018. Small and large-scale distribution of four classes of antibiotics in sediment: Association with metals and antibiotic resistance genes. Environ. Sci.: Processes Impacts, 5(6), pp 382–388. doi: 10.1039/c8em00190a

Pati, S.G., Arnold, W.A. 2018. Reaction rates and product formation during advance oxidation of ionic liquid cations by UV/peroxide, UV/persulfate, and UV/chlorine. Environ Sci.: Wat. Res. Technol. 4, 1310-1320. doi: 10.1039/C8EW00254A

McCabe, A.J., Arnold, W.A. 2018. Multiple linear regression models to predict the formation efficiency of triplet excited states of dissolved organic matter in temperate wetlands. Limnol. Oceanography. 63, 1992-2014. doi: 10.1002/lno.10820

View Arnold's full publication list on Google Scholar.