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.
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