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Title:Linking dissolved organic matter composition to photodegradation of select contaminants
Author(s):Beer, Kailey
Subject(s):emerging contaminants
Abstract:Presented by: Kailey Beer – Student at University of St. Thomas, Co-authors: Kailey E. Beer, Alyssa B. Risch, Isabella M. Kelly, Stephanie M. Berg, Christina K. Remucal, Kristine H. Wammer Abstract: Contaminants found in surface waters that undergo photolysis can follow two degradation pathways, direct or indirect. Direct degradation occurs when the contaminant absorbs photons from the sun resulting in degradation. Indirect degradation occurs when dissolved organic matter (DOM), also found in surface waters, is irradiated, producing photochemically produced reactive intermediates (PPRIs), which have the potential to degrade contaminants. The steady-state concentrations of these PPRIs, such as triplet-state DOM (3DOM*), singlet-state oxygen (1O2), and radicals such as hydroxyl radical (OH), depends on the composition of the DOM. This project sourced samples from agricultural, rural, and urban surface waters throughout Minnesota and Wisconsin with a range of DOM composition. Samples were spiked with one of four contaminants, atorvastatin, carbamazepine, cimetidine, or sulfadiazine, irradiated in a photoreactor (=365 nm), and both carbon-normalized indirect and direct photodegradation rate constants were quantified. Relationships between contaminant transformation rates and DOM composition and concentration will be presented; in most cases DOM derived from aquatic systems is more efficient for contaminant transformation. Biography: Kailey is a senior at the University of St. Thomas where she is majoring in Biochemistry and minoring in Sustainability. She plans on attending graduate school in the future for environmental chemistry and hopes to start a career in environmental consulting.
Issue Date:2021-04-27
Series/Report:2021 Emerging Contaminants in the Environment Conference (ECEC21)
Genre:Presentation / Lecture / Speech
Conference Paper / Presentation
Date Available in IDEALS:2021-04-26

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