Browsing by Author "Arnold, William A"

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Comprehensive screening of quaternary ammonium surfactants and ionic liquids in wastewater effluents and lake sediments
(2019-11-25) Pati, Sarah G; Arnold, William A; arnol032@umn.edu; Arnold, William A; University of Minnesota, Department of Civil, Environmental, and Geo- Engineering
Quaternary ammonium compounds (QACs) are widely used as surfactants and biocides and also comprise the cations in ionic liquids. QACs have the potential to reach the environment via household, agricultural, and industrial use, and it is important to understand the distribution and sources of these compounds in aquatic systems. In this study, QACs were found in both wastewater effluents and sediments, with compounds containing twelve or more carbons in the side-chain being more prevalent in both matrices. Data from wastewater treatment plants with different unit operations and from sediment cores point to wastewater treatment practices and usage rates being important factors in dictating the environmental prevalence of QACs.
Data for Evolving Mineralogy and Reactivity of Hematite-Coated Sands During Reduction by Fe(II) of 4-Chloronitrobenzene in Column Reactors
(2024-10-14) Harris, Celina M; Soroush, Adel; Hildebrandt, Alanna M; Amen, Kamilah Y; Corcoran, Louis G; Feinberg, Joshua M; Arnold, William A; Penn, R Lee; arnol032@umn.edu; Arnold, William; Arnold, Penn and Feinberg labs at the University of Minnesota
This study explores the reaction of contaminants mediated by iron oxide minerals in a column reactor that simulated iron reducing groundwater conditions. Reaction of the model nitroaromatic pollutant with hematite-coated sand in column reactors leads to growth of goethite and evolving reactivity due to changes in accessible surface area. Data collected include concentrations of the model pollutant (4-chloronitrobenzene) and its reaction product, the amount of new iron oxide mineral formed, and chloride concentrations in tracer studies.
Data for Quaternary ammonium compounds (QACs) in wastewater influent and effluent collected throughout the COVID-19 pandemic
(2024-01-08) Mahony, Anna K; McNamara, Patrick J; Arnold, William A; mahon445@umn.edu; Mahony, Anna K; University of Minnesota Environmental Engineering Arnold Lab
The dataset contains the concentrations of quaternary ammonium compounds detected in influent and effluent wastewater, as well as absolute recoveries of QACs spiked into influents and effluents, and absolute recoveries of isotopically labeled surrogate standards, spiked into all samples. After extraction from wastewater, samples are analyzed on a liquid chromatography tandem mass spectrometry (LC-MS/MS), specifically a triple quadrupole mass spec. Raw data from this instrument is provided as well, in the "Raw QQQ data" tab.
Data Supporting Neonicotinoid Insecticides in Surface Water, Groundwater, and Wastewater across Land Use Gradients and Potential Effects
(2020-07-23) Berens, Matthew J; Capel, Paul D; Arnold, William A; arnol032@umn.edu; Arnold, William A; University of Minnesota Department of Civil, Environmental, and Geo- Engineering
Neonicotinoid insecticides are known to cause adverse effects on non-target organisms, but more information about their occurrence in surface and groundwater is needed across a range of land use. In this study, water samples from across the state of Minnesota, U.S., were analyzed to determine the variability in spatiotemporal neonicotinoid concentrations and their relations to land use, hydrogeologic condition, and to assess potential effects on aquatic life. Sixty-five sites, representing rivers and streams, lakes, groundwater, and treated wastewater were monitored, via collection of 157 water samples. Results showed that total neonicotinoid concentrations were the highest in agricultural watersheds (median = 12 ng/L) followed by urban (2.9 ng/L) and undeveloped watersheds (1.9 ng/L). Clothianidin was most frequently detected in agricultural areas, and imidacloprid was most frequently detected in urban waters. The seasonal trend of neonicotinoid concentrations in rivers, streams, and lakes showed that their highest concentrations coincided with spring planting and elevated streamflow conditions. Consistently low neonicotinoid concentrations were found in shallow groundwater in agricultural regions. Treated municipal wastewater had the highest overall concentrations, however, neonicotinoid loads from rivers and streams (median = 4100 mg/d) were greater than in treated wastewater 700 mg/d). No concentrations exceeded aquatic-life benchmarks, but increasing use and sublethal effects create potential risks, such as toxicity and disrupted development of aquatic insects, to natural and engineered waters. This the first study of its size to document the occurrence of neonicotinoid insecticides in Minnesota and is critical to better understanding the drivers of widescale environmental contamination by neonicotinoids where urban, agricultural, and undeveloped lands are present.
Hydrolysis and Photolysis of Neonicotinoid Insecticides
(2018-08-16) Todey, Stephen A; Fallon, Ann M; Arnold, William A; arnol032@umn.edu; Arnold, William A.; University of Minnesota, Department of Civil, Environmental, and Geo- Engineering and Department of Entomology
Data for the hydrolysis of neonicotinoid insecticides as a function of pH and for photolysis under natural and simulated sunlight.
Measurement of Antibiotics in Water and Sediment: Determining Minnesota's Antibiotic Footprint
(2020-05-22) Frankson, Lara E; Arnold, William A; arnol032@umn.edu; Arnold, William A; University of Minnesota, Department of Civil, Environmental, and Geo- Engineering
Antimicrobial resistance is considered to be one of the greatest global public health threats of the 21st century. The discharge of antibiotics into the environment may increase antimicrobial resistance as well as disrupt proper ecosystem functioning. Thus, evaluating the antibiotics present in the environment as well as the contributing factors to their presence in the environment will provide invaluable information for improving water quality and protecting human and ecosystem health. This dissertation investigates the presence of antibiotics in water and sediment in both wastewater treatment effluent and agricultural animal affected areas throughout Minnesota. This is to provide a fine scale as well as a broadscale approach with multiple samples at each site at sites across Minnesota. Additionally, a snapshot of the antibiotics present and long term trends of antibiotics in the environment are investigated through water and sediment samples, respectively.
Optical and Photochemical Data of Prairie Wetlands Collected in North Dakota and Minnesota from 2012-July to 2014-November
(2017-03-07) Arnold, William A; arnol032@umn.edu; Arnold, William A; McCabe, Andrew, J
Surface water samples were collected from seven prairie pothole wetlands between 2012-July and 2014-November. Optical and photochemical parameters of the samples were measured under controlled laboratory conditions. The data were collected to better understand the way in which seasonal changes and spatial differences in prairie wetland water chemistry influence photochemistry. Samples are identified by the month and year in which they were collected and the typical hydroperiod of the wetland surface water (temporary or semi-permanent). Rates of formation, steady-state concentrations, and apparent quantum yields (or appropriate proxies) were measured for triplet excited states of dissolved organic matter, singlet oxygen, hydroxyl radical, and carbonate radical under a broadband xenon-arc lamp with a 290-nm wavelength filter.
Optical and photochemical data of temperate wetland samples collected in Minnesota, USA from 2014-August to 2015-October
(2018-06-01) Arnold, William A; McCabe, Andrew J; arnol032@umn.edu; Arnold, William A
Wetland surface water samples were collected from 39 sites throughout Minnesota, USA between 2014-August and 2015-October. Optical and photochemical parameters of the samples were measured under controlled laboratory conditions. The data were collected to identify environmental variables that constrain the yield of triplet excited states of dissolved natural organic matter. Apparent quantum yields of these triplet states were measured using the chemical probe, 2,4,6-trimethylphenol, under a broadband xenon-arc lamp with a 290-nm wavelength filter.
Photochemical Data of Stormflow Samples Collected Near Minneapolis and St. Paul, Minnesota from 2014-September to 2015-October
(2017-08-24) McCabe, Andrew J; Arnold, William A; arnol032@umn.edu; Arnold, William A
Stormflow samples were collected from 31 sites near Minneapolis and St. Paul, Minnesota between 2014-September and 2015-October. Optical and photochemical parameters of the samples were measured under controlled laboratory conditions. The data were collected to better understand the way in which land cover with variable levels of human impact influence the formation rate and yield of triplet excited states of dissolved natural organic matter (3DOM*). Rates of formation (Rf,T) and apparent quantum yields (AQYT) were measured for 3DOM* using the chemical probe, 2,4,6-trimethylphenol, under a broadband xenon-arc lamp with a 290-nm wavelength filter.
Quantification of Hydroxylated Polybrominated Diphenyl Ethers (OH-BDEs), Triclosan, and Related Compounds in Freshwater and Coastal Systems
(2015-08-28) Kerrigan, Jill F; Engstrom, Daniel R; Yee, Donald; Sueper, Charles; Erickson, Paul R; Grandbois, Matthew; McNeill, Kristopher; Arnold, William A; arnol032@umn.edu; Arnold, William A
The data generated is levels of several target contaminants in freshwater and marine systems. The data is associated with a PLOS article that discusses the importance the natural or anthropogenic sources of these pollutants.
Sedimentary Record of Antibiotic Accumulation in Minnesota Lakes
(2018-01-29) Arnold, William A; Kerrigan, Jill F; Sandberg, Kyle; Engstrom, Daniel R; LaPara, Tim; arnol032@umn.edu; Arnold, William; Arnold, William
The widespread detection of antibiotics in the environment is concerning because antibiotics are designed to be effective at small doses. The objective of this work was to quantify the accumulation rates of antibiotics used by humans and animals, spanning several major antibiotic classes (sulfonamides, tetracyclines, fluoroquinolones, and macrolides), in Minnesota lake-sediment cores. Our goal was to determine temporal trends, the major anthropogenic source to these lacustrine systems, and the importance of natural production. A historical record of usage trends for ten human and/or animal-use antibiotics (four sulfonamides, three fluoroquinolones, one macrolide, trimethoprim, and lincomycin) was faithfully captured in the sediment cores. Nine other antibiotics were not detected. Ofloxacin, trimethoprim, sulfapyridine, and sulfamethazine were detected in all of the anthropogenically-impacted studied lakes. Maximum sediment fluxes reached 20.5 ng cm−2 yr−1 (concentration 66.1 ng/g) for ofloxacin, 1.2 ng cm−2 yr−1 (1.2 ng/g) for trimethoprim, 3.3 ng cm−2 yr−1 (11.3 ng/g) for sulfapyridine, and 1.0 ng cm−2 yr−1 (1.6 ng/g) for sulfamethazine, respectively. Natural production of lincomycin may have occurred in one lake at fluxes ranging from 0.4 to 1.8 ng cm−2 yr−1 (0.1 to 5.8 ng/g).Wastewater effluent appears to be the primary source of antibiotics in the studied lakes, with lesser inputs from agricultural activities.
Strobin water samples, Whitewater River, 2019, 131 samples
(2020-06-24) O'Connor, Meghan; Arnold, William A; oconn617@umn.edu; Arnold, William A.; University of Minnesota Arnold laboratory
Triclosan, Chlorinated Triclosan Derivative, and Dioxin Levels in Minnesota Lakes
(2013-12-02) Anger, Cale T; Sueper, Charles; Blumentritt, Dylan J; Mcneill, Kristopher; Engstrom, Daniel R; Arnold, William A; arnol032@umn.edu; Arnold, William A
The data were collected and generated during the period of 2010-2012 by collecting sediment cores from lakes in Minnesota, dating the years the sediment was deposited as a function of depth, and extracting sections of the cores with solvent to determine the levels of triclosan (TCS), chlorinated triclosan derivatives (CTD), and dioxins in the sediment (PCDD). Dating was performed at the St. Croix Watershed Research Station, triclosan and chlorinated triclosan derivative measurements at the University of Minnesota Department of Civil Engineering, and dioxin analysis by Pace Analytical. The data consists of eight Excel files that include the following tabs 1) accumulation rate and focus corrected accumulation rate of the target contaminants as function of time (FF_Flux), 2) the concentrations of the target contaminants and function of time, 3) the calibration curves of the instruments for triclosan and chlorinated triclosan derivatives, and 4) various statistical analyses (ANOVA). Note that the further back in time, the deeper the sediment that the sample was derived from.

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Browsing by Author "Arnold, William A"