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2021

Chemistry

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Articles 31 - 58 of 58

Full-Text Articles in Physical Sciences and Mathematics

Progress Towards Synthesis And Characterization Of Bay-Annulated Indigo Chromophores, Katherine Weiss, Denise Femia Apr 2021

Progress Towards Synthesis And Characterization Of Bay-Annulated Indigo Chromophores, Katherine Weiss, Denise Femia

HON499 projects

Through acetylation, N,N’-diacetylindigo was synthesized from indigo. N,N’-diacetylindigo and 2-thiopheneacetyl chloride were combined in an attempt to synthesize 7-thiophenyl bayannulated indigo (BAI). After 1H NMR characterization, it was found that the product was not 7-thiophenyl BAI. A previously synthesized sample of 7-phenyl BAI was purified. UV-VIS absorbance, fluorescence, IR, and 1H NMR were used to characterize the compounds.

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The Analysis Of Heavy Metals In Samples Of Honey Using X-Ray Fluorescence And Anodic Stripping Voltammetry, Mia Arrieta, Kaleigh Beale Apr 2021

The Analysis Of Heavy Metals In Samples Of Honey Using X-Ray Fluorescence And Anodic Stripping Voltammetry, Mia Arrieta, Kaleigh Beale

Spring Showcase for Research and Creative Inquiry

A daunting reality is haunting scientists as Colony Collapse Disorder (CCD) is declining bee population in the United States (1). A concrete conclusion as to why CCD is happening remains unclear but extensive research and studies are leaning towards a toxic component in honey to bees called hydroxymethylfurfural (HMF) (1). HMF has been a culprit in question for a while but researchers are still on the fence as to whether it should be concluded as such. It is theorized that HMF is formed in very warm temperatures and catalyzed by a metal in honey; manganese (1). Manganese is one of …

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Chemistry Meets Art: Instrumental Analysis At The Lcva, James Rakes, Mia Arrieta, Kaleigh Beale, Adonel Grubb Apr 2021

Chemistry Meets Art: Instrumental Analysis At The Lcva, James Rakes, Mia Arrieta, Kaleigh Beale, Adonel Grubb

Spring Showcase for Research and Creative Inquiry

This project is an ongoing collaboration between the Longwood chemistry program and the Longwood Center for the Visual Arts. The demonstration shows the capabilities of the X-ray fluorescence spectrophotometer as a non-destructive elemental analysis technique. Our class visited the LCVA to analyze several pieces in their art collections. We were able to utilize the XRF instrument to analyze the elemental composition of glass and metal, painted pottery and porcelain, oil paintings, and metals. This project lays the groundwork for further research using X-ray fluorescence for non-destructive chemical analysis.

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Chemical Analysis Of An Herbal Opioid, Lauren Johnson Apr 2021

Chemical Analysis Of An Herbal Opioid, Lauren Johnson

Spring Showcase for Research and Creative Inquiry

Different chromatography techniques were used to analyze the concentration of an active component, mitragynine, in kratom samples. The analysis also compared three different extraction methods, one using ultrasonification, the other two using a commercial at home espresso maker. Using gas chromatography mass spectrometry, and high performance liquid chromatography, comparisons between key compounds in the substances were determined and concentrations of mitragynine within the samples were calculated.

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Water Quality Assessment Of Farmville, Va, Meghan Hall Apr 2021

Water Quality Assessment Of Farmville, Va, Meghan Hall

Spring Showcase for Research and Creative Inquiry

In Farmville, some people drink tap water, but others choose only to drink filtered or bottled water. Some blame this on taste, and others say the mineral content affects their skin from sinks and showers. I propose to conduct an analysis of water hardness and chloride, nitrate, and lead levels of water from various sources in Farmville, Virginia. To measure each parameter, an EDTA titration was carried out to test for water hardness, anodic stripping voltammetry was conducted to detect lead, ion-selective electrode was used to measure chloride, and a modified Griess reaction was carried out to measure nitrate levels. …

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Cis-Trans Isomerism In Single Molecule Electronic Devices, Tinsae Alem Apr 2021

Cis-Trans Isomerism In Single Molecule Electronic Devices, Tinsae Alem

Spring Showcase for Research and Creative Inquiry

We investigated the switching properties of cis-trans isomers of azobenzene for single molecule electronics. Although the cis-trans isomerization leads to structural changes within the molecule, the current flow is found to depend mainly on the relative position of the electrodes. The on/off ratio was determined to measure the performance of these isomers as switches. Different cis-trans isomers were studied to compare results.

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A Non-Destructive Analytical Technique Used For Analyzing A Variety Of Glassware Samples In Hopes To Determine Their Elemental Composition Based Off Their Qualitative And Quantitative Data Results., Angela Scarpa Apr 2021

A Non-Destructive Analytical Technique Used For Analyzing A Variety Of Glassware Samples In Hopes To Determine Their Elemental Composition Based Off Their Qualitative And Quantitative Data Results., Angela Scarpa

Spring Showcase for Research and Creative Inquiry

In this study, XRF analysis was used to examine and identify specific glassware samples, exported from remote locations, in hopes to determine any correlation between the glass samples being tested. During experimentation, there were 41 glass samples and 3 glass standards that were examined and quantitatively analyzed to determine the elemental compositions of all samples. To ensure optimal sensitivity of these different materials, four methods were utilized to confirm accurate data is collected and to improve all quantitative data results. These four methods contain distinct experimental factors and were purposely selected due to their specific current, voltage, filter, time, and …

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Alternative View Of Oxygen Reduction On Porous Carbon Electrocatalysts: The Substance Of Complex Oxygen-Surface Interactions, Giacomo De Falco, Marc Florent, Jacek Jagiello, Yongqiang Cheng, Luke L. Daemen, Anibal J. Ramirez-Cuesta, Teresa J. Bandosz Mar 2021

Alternative View Of Oxygen Reduction On Porous Carbon Electrocatalysts: The Substance Of Complex Oxygen-Surface Interactions, Giacomo De Falco, Marc Florent, Jacek Jagiello, Yongqiang Cheng, Luke L. Daemen, Anibal J. Ramirez-Cuesta, Teresa J. Bandosz

Publications and Research

Electrochemical oxygen reduction reaction (ORR) is an important energy-related process requiring alternative catalysts to expensive platinum-based ones. Although recently some advancements in carbon catalysts have been reported, there is still a lack of understanding which surface features might enhance their efficiency for ORR. Through a detailed study of oxygen adsorption on carbon molecular sieves and using inelastic neutron scattering, we demonstrated here that the extent of oxygen adsorption/interactions with surface is an important parameter affecting ORR. It was found that both the strength of O2 physical adsorption in small pores and its specific interactions with surface ether functionalities in the …

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Indolizine Donor-Based Dyes For Applications In Fluorescence Biological Imaging, William Meador Mar 2021

Indolizine Donor-Based Dyes For Applications In Fluorescence Biological Imaging, William Meador

Honors Theses

NIR emissive fluorophores are intensely researched due to their potential to replace modern imaging procedures. Many molecular strategies have been employed in the literature to optimize fluorophores for deeper NIR absorption and emission, biocompatibility, and higher fluorescence quantum yields. Amongst the fluorophores studied to date, proaromatic indolizine donors are attractive alternatives to traditional alkyl amine and indoline based donors due to their 1) lower energy absorption and emission facilitated by proaromaticity, 2) large Stokes shifts due to increased dihedral angles about the π-system, 3) ease of functionalization and capacity for bioconjugation at the phenyl ring, and 4) potential for further …

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Substituent Effects On The Solubility And Electronic Properties Of The Cyanine Dye Cy5: Density Functional And Time-Dependent Density Functional Theory Calculations, Austin Biaggne, William B. Knowlton, Bernard Yurke, Jeunghoon Lee, Lan Li Feb 2021

Substituent Effects On The Solubility And Electronic Properties Of The Cyanine Dye Cy5: Density Functional And Time-Dependent Density Functional Theory Calculations, Austin Biaggne, William B. Knowlton, Bernard Yurke, Jeunghoon Lee, Lan Li

Materials Science and Engineering Faculty Publications and Presentations

The aggregation ability and exciton dynamics of dyes are largely affected by properties of the dye monomers. To facilitate aggregation and improve excitonic function, dyes can be engineered with substituents to exhibit optimal key properties, such as hydrophobicity, static dipole moment differences, and transition dipole moments. To determine how electron donating (D) and electron withdrawing (W) substituents impact the solvation, static dipole moments, and transition dipole moments of the pentamethine indocyanine dye Cy5, density functional theory (DFT) and time-dependent (TD-) DFT calculations were performed. The inclusion of substituents had large effects on the solvation energy of Cy5, with pairs of …

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Improving Conceptual Understanding Of Gas Behavior Through The Use Of Screencasts And Simulations, Brianna L. Martinez, Ryan D. Sweeder, Jessica Vandenplas, Deborah Herrington Jan 2021

Improving Conceptual Understanding Of Gas Behavior Through The Use Of Screencasts And Simulations, Brianna L. Martinez, Ryan D. Sweeder, Jessica Vandenplas, Deborah Herrington

Peer Reviewed Articles

Engagement with particle-level simulations can help students visualize the motion and interactions of gas particles, thus helping them develop a more scientifically accurate mental model. Such engagement outside of class prior to formal instruction can help meet the needs of students from diverse backgrounds and provide instructors with a common experience upon which to build with further instruction. Yet, even with well-designed scaffolds, students may not attend to the most salient aspects of the simulation. In this case, a screencast where an instructor provides narrated use of the simulation and points students towards the important observations may provide additional benefits. …

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Optimization Of Simple And Inexpensive Paper-Based Assay For Lead, Kyla Dewittie, Sagar S. Patel Jan 2021

Optimization Of Simple And Inexpensive Paper-Based Assay For Lead, Kyla Dewittie, Sagar S. Patel

Summer Scholarship, Creative Arts and Research Projects (SCARP)

The Environmental Protection Agency (EPA) guidelines state that lead is a toxic metal that humans should not be exposed to in any amount. Due to corrosion of water pipes, lead can enter drinking water and be consumed by millions of people. As a group, we decided to reduce this issue by creating a simple and inexpensive paper-based test to detect lead(II) in water. The signal for this test results from encapsulating a phenanthroline-based probe in synthesized polymer nanoparticles. This test will display a colorimetric change, turning from yellow to bright orange if lead(II) is present in the water system. In …

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Synthesis And Characterization Of Oxovanadium Compounds As Potential Insulin Mimetic Molecules, Kaitlyn Mercando, Jeffrey A. Rood Jan 2021

Synthesis And Characterization Of Oxovanadium Compounds As Potential Insulin Mimetic Molecules, Kaitlyn Mercando, Jeffrey A. Rood

Summer Scholarship, Creative Arts and Research Projects (SCARP)

Oxovanadium(IV) complexes have numerous applications in diverse areas such as catalysts for organic transformations and as anti-fungal agents. Complexes that this research focused on have shown potential in acting as insulin mimetics. The goal of this research was to synthesis and fully characterize a new series of oxovanadium complexes and then investigate the insulin mimetic properties of the complexes with adipose cell culture work. Vanadyl complexes involving a series of salicylaldiminato ligands [C6H5N=CHC6H4OH (L1), 2,6-iPrC6H3N=CHC6H4OH (L2), C6H5N=CH-3,5-tBu2C6H2OH (L3) and 2,6-iPrC6H3N=CH-3,5-tBu2C6H2OH (L4)] were synthesized and structurally characterized. The ligand set was investigated due to the ease of sterically tuning the substituents …

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Incorporation Of Luminescent Osmium Complexes Into Metal-Organic Frameworks: Optimization Of Osmium Complex Synthesis And Effect Of Mof Structure On Complex Inclusion And Emission, Brandon A. Molina, Lucas Stehle, Jeffrey A. Rood Jan 2021

Incorporation Of Luminescent Osmium Complexes Into Metal-Organic Frameworks: Optimization Of Osmium Complex Synthesis And Effect Of Mof Structure On Complex Inclusion And Emission, Brandon A. Molina, Lucas Stehle, Jeffrey A. Rood

Summer Scholarship, Creative Arts and Research Projects (SCARP)

Metal-Organic Frameworks (MOFs) are materials that contain metal centers coordinated by organic molecules that form an extended, porous lattice. These MOFs are of interest in the field of sensing for their unique properties such as high stability, high surface area, high crystallinity, and ability to perform small molecule exchange. Luminescent metal-organic frameworks (LMOFs) are of specific interest since they contain the potential to detect odorless volatile organic compounds (VOCs) via adsorption into the porous framework. Luminescent properties can be imparted to MOFs in several ways. This project focused on the inclusion of a luminescent osmium complex into the MOF scaffold. …

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Computational Analysis Beyond The Monomer Frontier Orbitals For Photovoltaic Donor-Polymer Candidates, Mitchell E. Lahm, Megan M. Niblock, John M. Migliore, Kendra M. Mckenzie, Hans P. Lüthi, Rollin A. King Jan 2021

Computational Analysis Beyond The Monomer Frontier Orbitals For Photovoltaic Donor-Polymer Candidates, Mitchell E. Lahm, Megan M. Niblock, John M. Migliore, Kendra M. Mckenzie, Hans P. Lüthi, Rollin A. King

Chemistry Faculty Publications

Scharber et al. proposed an efficiency model for organic photovoltaic cells based on the orbital energies of the monomers of the donor- and acceptor- polymers [Advanced Materials 18 (2006) 789–794]. We report theoretical extensions of this approach. First, the frontier-orbital energies and electronic spectra of n-length oligomers (n = 1 − 5) of 3-butylthiophene have been determined. The results show reasonable convergence with respect to system size at the point of a trimer with alkyl end caps. The HOMO-LUMO gap well matches computed excitation energies. Second, the structures and electronic spectra of dimers formed by three different monomers, with various …

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Using Augmented Reality As A Tool For Distance Learning Of Vsepr Theory, Isabelle Lopez Jan 2021

Using Augmented Reality As A Tool For Distance Learning Of Vsepr Theory, Isabelle Lopez

Scripps Senior Theses

Distance learning poses challenges in most academic settings, especially at the undergraduate laboratory level. Improving this mode of learning diminishes the impact of current events on young scientists’ development of foundational laboratory concepts. Our work explores the use of augmented reality (AR) in a laboratory setting. We developed a completely virtual valence shell electron pair repulsion (VSEPR) theory lab activity consistent with the goals of Keck Science Department’s Introduction to Chemistry course’s in-person VSEPR lab activity. We were able to maintain a hands-on learning experience for students while using a tool many students already own: an iPhone as an alternative …

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In Depth Characterisation Of The Biomolecular Coronas Of Polymer Coated Inorganic Nanoparticles With Differential Centrifugal Sedimentation, André Perez-Potti, Hender Lopez, Beatriz Pelaz, Abuelmagd Abdelmonem, Mahmoud G. Soliman, Ingmar Schoen, Philip M. Kelly, Kenneth A. Dawson, Wolfgang J. Parak, Zeljka Krpetic, Marco P. Monopoli Jan 2021

In Depth Characterisation Of The Biomolecular Coronas Of Polymer Coated Inorganic Nanoparticles With Differential Centrifugal Sedimentation, André Perez-Potti, Hender Lopez, Beatriz Pelaz, Abuelmagd Abdelmonem, Mahmoud G. Soliman, Ingmar Schoen, Philip M. Kelly, Kenneth A. Dawson, Wolfgang J. Parak, Zeljka Krpetic, Marco P. Monopoli

Articles

Advances in nanofabrication methods have enabled the tailoring of new strategies towards the controlled production of nanoparticles with attractive applications in healthcare. In many cases, their characterisation remains a big challenge, particularly for small-sized functional nanoparticles of 5 nm diameter or smaller, where current particle sizing techniques struggle to provide the required sensitivity and accuracy. There is a clear need for the development of new reliable characterisation approaches for the physico-chemical characterisation of nanoparticles with significant accuracy, particularly for the analysis of the particles in the presence of complex biological fluids. Herein, we show that the Differential Centrifugal Sedimentation can …

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Reversible Addition-Fragmentation Chain-Transfer Emulsion Polymerization And Its Application To Waterborne Coatings, Andrew Balgeman Jan 2021

Reversible Addition-Fragmentation Chain-Transfer Emulsion Polymerization And Its Application To Waterborne Coatings, Andrew Balgeman

Graduate Research Theses & Dissertations

Waterborne acrylic latex makes up a vast majority of the architectural coatings market, including most of the paints sold in retail stores. Most, if not all, of these latex formulations are prepared using radical polymerization of acrylic monomers. Reversible addition-fragmentation chain-transfer (RAFT) polymerization has been researched for over two decades, but to this point has made very little progress finding success in commercial applications. Indeed, a majority of RAFT research has been dedicated to successfully polymerizing different monomers with good degree of polymerization control, and very little research has been directed toward actual coating applications. In this study, we focused …

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Utilizing Raman Spectroscopy To Determine The Time Since Deposition Of Heated Bloodstains, Alexis Pearl Barber Jan 2021

Utilizing Raman Spectroscopy To Determine The Time Since Deposition Of Heated Bloodstains, Alexis Pearl Barber

Legacy Theses & Dissertations (2009 - 2024)

The development of novel forensic methods is a rapidly growing area within analytical chemistry. Analytical chemistry is well suited for forensic analyses as a plethora of information can be ascertained from utilizing a wide variety of techniques. At the scene of violent crimes, bloodstain evidence is one of the most frequently found and valuable types of evidence. This is because blood is a complex biological fluid which can provide crucial information during a forensic investigation including DNA evidence. The most informative form of analysis is DNA profiling, which potentially allows for the identification of an individual. However, there is more …

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Mass Spectral And Chemometric Analysis For The Detection And Identification Of Forensically Relevant Materials, Meghan Grace Appley Jan 2021

Mass Spectral And Chemometric Analysis For The Detection And Identification Of Forensically Relevant Materials, Meghan Grace Appley

Legacy Theses & Dissertations (2009 - 2024)

Forensic science is the application of science to the law which in and of itself covers a substantial number of disciplines. Many of these involve the detection and identification of materials using analytical techniques. Traditional analysis methods include microscopy, spectroscopy and mass spectrometry. The materials encountered by forensic practitioners are ever evolving, resulting in the need to develop new methods to complement conventional techniques to enhance the evidentiary value of the samples. The research presented here shows that novel methods including direct analysis in real time–high-resolution mass spectrometry (DART-HRMS), thermal desorption coupled with gas chromatography-mass spectrometry (TD-GC-MS), solid-phase microextraction (SPME) …

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The Detection And Identification Of Blood On Interfering Substrates Using Raman Spectroscopy And Hamand For Forensic Purposes, Jalissa M. Thomas Jan 2021

The Detection And Identification Of Blood On Interfering Substrates Using Raman Spectroscopy And Hamand For Forensic Purposes, Jalissa M. Thomas

Legacy Theses & Dissertations (2009 - 2024)

Body fluids, such as blood and semen, can provide invaluable information to a criminal investigation. As such, it is imperative that body fluid evidence is properly detected and identified. Our laboratory has developed a methodology to universally detect and identify body fluids using Raman spectroscopy and chemometrics. This methodology was developed under ideal conditions, which are rare in the field. Body fluid evidence can be found on substrates that produce a large Raman signal that can hinder detection of body fluid traces, which produce a weak signal. This project proposes the use of a statistical program called HAMAND (Hypothetical Addition …

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The Formation Of Prenucleation Clusters For Calcium Fluoride, Taylor M. Muterspaw Jan 2021

The Formation Of Prenucleation Clusters For Calcium Fluoride, Taylor M. Muterspaw

Browse all Theses and Dissertations

There have been limited studies on the analysis of the nucleation and precipitation behind calcium fluoride. Earlier studies support a nucleation mechanism in agreement to classical nucleation theory (CNT) in which a surface nucleation mechanism is required for calcium fluoride. This experiment devised using the ISE method to calcium fluoride to find evidence of a nucleation mechanism like that of calcium carbonate (prenucleation cluster pathway). The potential and pH were recorded versus time and the potential data was converted to nCa2+ data of free calcium ions. It was determined that there was evidence of a similar nucleation mechanism for calcium …

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Investigation Into The Source Of Contamination Of Surface Waters Flowing Through The Wright State University Woods, Nnadozie Kennedy Okeke Jan 2021

Investigation Into The Source Of Contamination Of Surface Waters Flowing Through The Wright State University Woods, Nnadozie Kennedy Okeke

Browse all Theses and Dissertations

This investigative research was carried out with the purpose of determining the source of contaminants present in the surface waters flowing through the Wright State University woods. Five sample sites going from upstream to downstream namely; Inflow to Nutter Center Pond (INNCP), Nutter Center Pond (NCP), Outfall 21 (OTF 21), Burley, and Outfall 15 (OTF 15), were sampled over a time period spanning from June 2020 to January 2021. Samples collected were analyzed for Escherichia coli (E. coli) using 3M™ Petrifilm™ E. coli/Coliform Count (EC) plates, select anions (Phosphate PO43-, Nitrate NO3-, Sulfate SO42-, Fluoride F- and Chloride Cl-) using …

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Cytoviva Hyperspectral Imaging For Comparing The Uptake And Transformation Of Agnps And Ag+ In Mitochondria, Kristina Steingass Jan 2021

Cytoviva Hyperspectral Imaging For Comparing The Uptake And Transformation Of Agnps And Ag+ In Mitochondria, Kristina Steingass

Browse all Theses and Dissertations

Nanomaterials have attracted significant attention in the last decade, with applications in everyday products. Amongst all known nanomaterials in use, silver is the leading metal, present in 531 different types of products, owing to their unique optical, electrical, antimicrobial, and thermal properties. Though silver nanoparticles (AgNPs) come in contact regularly with the general population, there is little known about their toxicity mechanism due to limited techniques for thorough analysis. CytoViva Hyperspectral Imaging (HSI) shows potential for filling these gaps. In this study, borohydride-capped AgNPs with an approximate diameter of 10 nm were synthesized using the modified Creighton method and characterized …

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Benzotriazole And Tolytriazole Analysis In Select Surface Waters Near Wilmington Air Park, Lee A. Raska Jan 2021

Benzotriazole And Tolytriazole Analysis In Select Surface Waters Near Wilmington Air Park, Lee A. Raska

Browse all Theses and Dissertations

Previous investigations into the presence of benzotriazole (BTZ) and corresponding analogs done in early 2019 found elevated levels near the Wilmington Air Park in Wilmington, Ohio. The analogs detected were 4-methyl-1H-benzotriazole and 5-methyl-1H-benzotriazole: known together as tolytriazole (TTZ). BTZ and TTZ are emerging environmental contaminants of concern that are often found in aircraft de-icing solutions, anti-icing solutions and detergents. The Wilmington Air Park has two facilities used to pre-treat runoff water before its subsequent release into surrounding streams. Three sites were chosen: Lytle Creek, Indian Run, and Cowan Creek. For the 2019 and 2019/2020 investigative projects, Cowan Creek was designated …

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Degradation Of Natural And Synthetic Fibers In Various Aqueous Environments, Jaylin Bryant Jan 2021

Degradation Of Natural And Synthetic Fibers In Various Aqueous Environments, Jaylin Bryant

Honors Scholars Collaborative Projects

Fabrics are one variant of polymers, macromolecules that form the foundation of our society. They consist of small subunits called monomers, which are covalently bonded together and layered over each other through intermolecular attractions. There are natural fabrics, such as cotton and silk, and synthetic fabrics like polyester and rayon. Scientists in forensic taphonomy study postmortem changes made to human remains, which can also include clothes found at the scene. In this study, the degradation rates of four white fabrics (cotton, polyester, rayon, and silk) were observed in various aqueous environments (pure, chlorinated, sea, and lake) in order to observe …

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Synthesis And Conformational Study Of Triazolylcyclohexanols And Trans-2-(Azaarylsulfanyl)-Cyclohexanols, Mulinde R. Ruyonga Jan 2021

Synthesis And Conformational Study Of Triazolylcyclohexanols And Trans-2-(Azaarylsulfanyl)-Cyclohexanols, Mulinde R. Ruyonga

University of the Pacific Theses and Dissertations

Amino-cyclohexanol derivatives have been successful models for pH-triggered conformational switches. By changing the groups on the amine nitrogen, these models provide a wide pH-range in which a switch can occur. The pH-induced switch of conformation can be monitored by 1H NMR.In this work, structurally similar trans-2-(azaarylsulfanyl)-cyclohexanol derivatives (Scheme 1) and trans-2-triazolylcyclohexanol derivatives (Scheme 2) have been explored for the first time as compounds with a potential for the analogous pH-induced conformational switch. The azaarylsulfanyl groups showed selective conformational flexibility while the triazolyl group showed a strong preference for the equatorial position. Further, conformational studies were done on a series of …

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The Potential For Remote Sensing Measurement Of Dissolved Organic Carbon As A Tool For Metal Risk Assessments, Mickey Nielsen Jan 2021

The Potential For Remote Sensing Measurement Of Dissolved Organic Carbon As A Tool For Metal Risk Assessments, Mickey Nielsen

Theses and Dissertations (Comprehensive)

The biotic ligand model (BLM) is a tool used to quantitatively evaluate how receiving water chemistry affects the bioavailability of metals. Sensitivity testing can be used to understand how the model outputs vary in response to systematic changes in water chemistry inputs. This will allow users of such models to understand how accurate their input parameters must be for a specified level of confidence in the output. Our focus was on dissolved organic carbon (DOC), which is often the most limiting data for application of BLM approaches to metals risk management. To potentially address DOC data limitations remote sensing can …

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