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SUMMARY:Freshwater Colloquium: Novel mechanistic insights into nanoplastics release in natural environment
DESCRIPTION:Boya Xiong will present “Novel mechanistic insights into nanoplastics release in natural environment” as part of the School of Freshwater Sciences spring colloquium.\nDr. Boya Xiong is an assistant professor in the Department of Civil\, Environmental\, and Geo-Engineering at the University of Minnesota\, Twin Cities. Dr. Xiong’s research focuses on the interface of polymer science and environmental engineering\, to i) elucidate the fundamental mechanisms of polymer degradation (e.g.\, micro/nanoplastic generation) that dictate the environmental fate and shape sustainable design and management of future polymer chemicals and materials; ii) develop novel nature-inspired membrane material architecture to enable efficient separation and mitigate pathogenic contamination and fouling in engineered systems. Xiong earned a Ph.D. in Environmental engineering at Pennsylvania State University where she also obtained her M.S. in Agricultural and Biological Engineering. Xiong earned a B.S. in Biotechnology from East China University of Science and Technology. Prior to her appointment\, Xiong was working as a postdoctoral associate at MIT. She was selected as ASCE MN chapter Young Engineer of the Year in 2023 and an American Academy of Environmental Engineers and Scientists 40 Under 40 awardee in 2024. \n  \n\nThe majority of prevalent micro- / nanoplastic (MP/NPs) pollutants are derived from the degradation of bulk plastics in the natural environment. Mechanical degradation (i.e.\, abrasion and fragmentation) is a primary mechanism of MP/NP release; however\, its fundamental understanding remains elusive. Furthermore\, data generated from disparate and qualitative mechanical degradation methods are hard to unify for estimating degradation in a diverse range of environmental conditions. In this talk\, I will highlight how fragmentation and surface abrasive wear play a different role in releasing MP/NPs during the lifetime of plastics. Focusing on abrasive wear\, I will introduce our novel and quantitative methods\, particularly our lateral force microscopy-based nanoscratch method\, to mechanistically probe MP/NP release at a single surface roughness protrusion (asperity) level. Next\, I will highlight the combined effects of photo-oxidization and nanoscale abrasive wear on releasing nanoplastic release. In particular\, I will elucidate the evolution of the wear mechanism and rates of semi-crystalline polyethylene during photooxidation. These results provide an underlying mechanism and key polymer properties responsible for why photooxidation leads to more nanoplastic release via abrasive wear. Our quantitative approach will significantly advance our understanding of MP/NP release in the natural environment. The data will contribute to future predictive modeling of nanoplastic release rate as a function of polymer properties and environmental conditions. Incorporating such models into an environmental risk assessment framework will guide the early-stage design\, selection\, and management of polymer materials for responsible environmental outcomes. \n\nThe Spring 2025 Freshwater Colloquium series will be held in the GLRF Ballroom. Most talks will involve the theme of Emerging Contaminants in Aquatic Environments. Snacks will be available prior to the talk. Please join us! \n\n\nThis presentation is open to students\, faculty\, staff\, alumni and the public. \n\n\n\n\n\n\n \n\nSpring 2025 Colloquium Series schedule. The Colloquium series creates a platform where students\, faculty\, and scientists discuss emergent issues related to freshwater science research. Invited speakers present specific topics of their research\, as well as policy\, commercial\, and industrial experiences. Everyone is welcome.
URL:/freshwater/event/freshwater-colloquium-boya-xiong/
LOCATION:School of Freshwater Sciences Ballroom\, First Floor\, 600 E Greenfield Avenue\, Milwaukee\, WI\, 53204
CATEGORIES:Alumni & Community,Career and Leadership Development,Faculty and Staff,Lectures Conferences and Symposiums,Public,Students,51���� Campus Events
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DTSTART;TZID=America/Chicago:20250414T150000
DTEND;TZID=America/Chicago:20250414T155000
DTSTAMP:20260420T004536
CREATED:20250407T162825Z
LAST-MODIFIED:20250407T162825Z
UID:10000150-1744642800-1744645800@uwm.edu
SUMMARY:Freshwater Colloquium: Groundwater management in Northeast Wisconsin: Potential for geogenic metals mobilization
DESCRIPTION:Erin Berns-Herrboldt will present “Groundwater management in Northeast Wisconsin: Potential for geogenic metals mobilization” as part of the School of Freshwater Sciences Spring colloquium.\nDr. Erin Berns-Herrboldt is an Assistant Professor of Water Science at the University of Wisconsin – Green Bay. She completed her PhD in Civil Engineering in the Environmental and Water Resources Engineering Program at the University of Texas at Austin and conducted postdoctoral research at Oak Ridge National Laboratory. Her research experience includes studying the fate of organic groundwater contaminants\, biogeochemical controls on carbon release from Arctic permafrost soils\, metals release from aquifer sediments\, and nutrient cycling in stream hyporheic zones. \n\nGroundwater quality can be impacted by metals released from aquifer minerals\, potentially causing human health concerns. When aquifer sediments are relatively undisturbed\, metals bound to minerals remain stable\, but during transitions in water level – due to variations in groundwater recharge or over-pumping – metals can be released to groundwater. This project evaluates the history of groundwater use in the Northeast Wisconsin Groundwater Management Area (GMA) for the confined Cambrian-Ordovician aquifer\, and explores the potential for metals release due to oxidation during aquifer drawdown. \n \nTo evaluate these changes\, (1) groundwater was sampled across the GMA for evaluation of water chemistry\, (2) a monitoring well was installed to improve groundwater level monitoring in the southern portion of the GMA\, and (3) batch leaching experiments were conducted under oxic and anoxic conditions with rock cuttings from the newly installed monitoring well to evaluate potential for metals release. Initial leaching experiment results show that nickel and cobalt increased over time in oxic experiments\, but not in anoxic experiments\, and negligible arsenic was observed over the experimental timeframe. This study provides initial results that support improved understanding of metals release from oxidized GMA aquifer sediments. Findings from this study will inform the development of effective groundwater management strategies\, ensuring the sustainability and safety of water resources in the Northeast Wisconsin GMA. \n\nThe Spring 2025 Freshwater Colloquium series takes place in the GLRF Ballroom. Most talks this semester will involve the theme of Emerging Contaminants in Aquatic Environments. Please join us! \n\n\nThis presentation is open to students\, faculty\, staff\, alumni and the public. \n\n\n\n\n\n\n\n\n \n\nSpring 2025 Colloquium Series schedule. The Colloquium series creates a platform where students\, faculty\, and scientists discuss emergent issues related to freshwater science research. Invited speakers present specific topics of their research\, as well as policy\, commercial\, and industrial experiences. Everyone is welcome.
URL:/freshwater/event/freshwater-colloquium-groundwater-management-in-northeast-wisconsin-potential-for-geogenic-metals-mobilization/
LOCATION:School of Freshwater Sciences Ballroom\, First Floor\, 600 E Greenfield Avenue\, Milwaukee\, WI\, 53204
CATEGORIES:Alumni & Community,Career and Leadership Development,Faculty and Staff,Lectures Conferences and Symposiums,Public,Students,51���� Campus Events
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DTSTART;TZID=America/Chicago:20250422T120000
DTEND;TZID=America/Chicago:20250422T130000
DTSTAMP:20260420T004536
CREATED:20250328T171030Z
LAST-MODIFIED:20250328T171030Z
UID:10000152-1745323200-1745326800@uwm.edu
SUMMARY:Earth Day Water Policy Scholar Webinar
DESCRIPTION:You are invited to “Possible Future Uses of New Lakefront at the Port of Milwaukee” on April 22\, 2025\, 12 p.m. to 1 p.m. CDT. \nThe Center for Water Policy is hosting an Earth Day webinar featuring James Wasley\, Professor at UW-Milwaukee and 2024-2025 Water Policy Scholar. He will present his research on the possible future uses of the Dredged Material Disposal Facility at the Port of Milwaukee. This facility is part of a broader network of dredge-spoil sites across the Great Lakes. He will also discuss these newly created lakefront lands in a basin-wide context and include examples of closure and conversion to future public uses in other parts of the Great Lakes. \nBuilding on prior workshops\, including the 2019 National Science Foundation Sustainable Urban Systems Workshop and the 2022 Great Lakes Higher Education Consortium Workshop\, Prof. Wasley’s research serves as a test case for collaboration among academic researchers\, design professionals\, and policymakers to develop innovative\, nature-based design solutions for Great Lakes cities. In August of 2024\, he convened a meeting of experts on issues associated with the dredged material disposal facilities and the future of this research aligns with the Freshwater Collaborative of Wisconsin’s Grand Water Challenge on Great Lakes Management and Restoration. \nProf. Wasley is Director of the Institute for Ecological Design and the former chair of the Department of Architecture. He is the past president of the Society of Building Science Educators and the Wisconsin Green Building Alliance: An Affiliate of the United States Green Building Council. He was a founding member of WGBA in 1997. \nThis event is co-hosted by the Freshwater Collaborative of Wisconsin and is part of a quarterly online water symposium series in partnership with the Great Lakes Higher Education Consortium and Council of the Great Lakes Region. \nRegister for the event here!
URL:/freshwater/event/earth-day-water-policy-scholar-webinar/
LOCATION:Virtual
CATEGORIES:Alumni & Community,Lectures Conferences and Symposiums,Public,51���� Campus Events
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DTSTART;TZID=America/Chicago:20250428T150000
DTEND;TZID=America/Chicago:20250428T155000
DTSTAMP:20260420T004536
CREATED:20250417T220141Z
LAST-MODIFIED:20250418T155845Z
UID:10000151-1745852400-1745855400@uwm.edu
SUMMARY:Freshwater Colloquium: Occurrence of Per- and Polyfluoroalkyl Substances (PFAS) in Surface Waters of the Chicago Area Waterway System
DESCRIPTION:Gordon Getzinger will present “Occurrence of Per- and Polyfluoroalkyl Substances (PFAS) in Surface Waters of the Chicago Area Waterway System” as part of the School of Freshwater Sciences Spring Colloquium\nDr. Getzinger is an Assistant Professor at Loyola University Chicago in the School of Environmental Sustainability (SES). As an environmental chemist he studies the occurrence and fate of anthropogenic chemicals in natural and engineered systems. Before joining the SES faculty in 2023\, he was a research scientist at Biobot Analytics\, a consultant at Exponent\, and a research scientist with the North Carolina PFAS Testing Network. Additionally\, he has held adjunct/lecturer appointments in the Chemistry Department at Tufts University and the Department of Civil and Environmental Engineering at MIT. He completed his post-doctoral training with the Environmental Chemistry Group at ETH Zurich and his PhD with Professor Lee Ferguson at the Nicholas School of the Environment at Duke University. \nPer- and polyfluoroalkyl substances (PFAS) are a class of organic contaminants occurring ubiquitously in aquatic environments owing to their wide-spread consumer and industrial use and the recalcitrance of carbon-fluorine bonds toward environmental transformations. PFAS accumulate in sediments and biota and are known to cause ecological and human health effects. PFAS use in industry and consumer goods leads to their occurrence in treated wastewater and residual biosolids. Furthermore\, recent research indicates that stormwater may transport PFAS from urban landscapes into aquatic ecosystems. Considering potential future regulations on levels of PFAS in wastewater discharges\, knowledge of PFAS sources in urban aquatic environments is essential for determining efficacy of any proposed discharge limits or ambient water quality standards. The Chicago Area Waterway System (CAWS) presents a unique opportunity for studying the sources and fate of PFAS in urban aquatic systems because the CAWS surface waters are highly impacted by treated wastewater effluent\, combined sewer overflows\, and stormwater runoff. However\, there are currently few data available on levels of PFAS in CAWS surface waters. To better understand current levels of PFAS in the CAWS\, we conducted a monitoring campaign in major CAWS waterways with varying degrees of stormwater runoff and wastewater influence. Samples were analyzed using solid phase extraction and high-performance liquid chromatography tandem mass spectrometry for >30 PFAS of regulatory concern. This presentation will explore relationships between PFAS occurrence and probable PFAS sources and evaluate PFAS concentrations considering current ecological health guidelines. \n\n\nThis final seminar of the Spring 2025 Freshwater Colloquium series will be held in the GLRF Ballroom. Another fascinating talk around this semester’s overarching theme of Emerging Contaminants in Aquatic Environments. Please join us! \n\n\nThis presentation is open to students\, faculty\, staff\, alumni and the public. \n\n\n\n\n \n\nFall 2025 Colloquium Series schedule. The Colloquium series creates a platform where students\, faculty\, and scientists discuss emergent issues related to freshwater science research. Invited speakers present specific topics of their research\, as well as policy\, commercial\, and industrial experiences. Everyone is welcome.
URL:/freshwater/event/freshwater-colloquium-occurrence-of-per-and-polyfluoroalkyl-substances-pfas-in-surface-waters-of-the-chicago-area-waterway-system/
LOCATION:School of Freshwater Sciences Ballroom\, First Floor\, 600 E Greenfield Avenue\, Milwaukee\, WI\, 53204
CATEGORIES:Alumni & Community,Career and Leadership Development,Faculty and Staff,Lectures Conferences and Symposiums,Public,Students,51���� Campus Events
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