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Filtering by: Creator Zinn, Jeffrey A. Remove constraint Creator: Zinn, Jeffrey A. Advisor Nason, Jeffrey A. Remove constraint Advisor: Nason, Jeffrey A. Degree Level Master's Remove constraint Degree Level: Master's

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  • Natural Organic Matter Surface Coverage as a Predictor of Heteroaggregation between Nanoparticles and Colloids

    Creator:
    Oney, Dylan M.
    Abstract:
    Heteroaggregation of nanoparticles with naturally occurring colloids has been shown to be an important process in nanoparticle fate and transport in the aquatic environment. The advent of a functional assay to measure heteroaggregation attachment efficiencies has opened the door for further mechanistic studies. It is well known that natural organic...
    Resource Type:
    Masters Thesis
    Full Text:
    : ______________________________________________________ Jeffrey A. Nason Heteroaggregation of nanoparticles with naturally occurring colloids

  • Evaluation of copper removal from stormwater runoff using compost and Apatite II™

    Creator:
    Silvertooth, Jason R.
    Abstract:
    Low concentrations of dissolved copper have proven to be harmful to a number of aquatic organisms, with recent research highlighting detrimental effects to endangered salmonid species. Stormwater runoff can represent a significant source of copper to surface waters, necessitating cost-effective alternatives to current stormwater best management practices (BMPs). This study...
    Resource Type:
    Masters Thesis
    Full Text:
    : ______________________________________________________ Jeffrey A. Nason Low concentrations of dissolved copper have proven to be harmful to

  • Evaluation of Apatite II™ for removal of copper and zinc from highway stormwater runoff : laboratory and field experiments

    Creator:
    Provolt, Justin J.
    Abstract:
    Current best management practices (BMPs) for stormwater treatment are not able to adequately remove heavy metals to levels which do not adversely affect aquatic life. Copper is commonly found in highway stormwater runoff, with the primary source being brake pad wear. Copper is of particular concern due to inhibitory effects...
    Resource Type:
    Masters Thesis
    Full Text:
    : ______________________________________________________ Jeffrey A. Nason Current best management practices (BMPs) for stormwater treatment are not

  • Copper Speciation in Wastewater-Impacted Surface Waters

    Creator:
    Mosbrucker, Ariel M.
    Abstract:
    This study investigates the relationship between total and ionic copper in samples taken from the Tualatin River and wastewater treatment facilities (WWTFs) that discharge into the Tualatin River. Copper speciation was analyzed by determining conditional stability constants and densities of copper binding ligands on the dissolved organic matter (DOM) in...
    Resource Type:
    Masters Thesis
    Full Text:
    Abstract Approved: Jeffrey A. Nason This study investigates the relationship between

  • The assessment of copper and zinc removal from highway stormwater runoff using Apatite II™

    Creator:
    Huang, Hsiao-Wen
    Abstract:
    Copper and zinc are heavy metals commonly present in highway stormwater runoff. Discharge of these metals to surface waters inhabited by sensitive aquatic species including threatened and endangered salmonids has necessitated the need for improved treatment techniques. Although copper is of the greater toxicological concern, zinc is often present at...
    Resource Type:
    Masters Thesis
    Full Text:
    Abstract approved: Jeffrey A. Nason Copper and zinc are heavy metals commonly present in highway

  • Statistical analysis and speciation modeling of copper in Oregon highway runoff

    Creator:
    Bloomquist, Don J.
    Abstract:
    Low levels of copper have been shown to impair the olfactory system of threatened and endangered (T&E) salmon, decreasing their predator avoidance behavior and likely increasing mortality. However, only dissolved copper (dissCu) present as the cupric ion (Cu2+) and weakly complexed species are truly bioavailable. Previous studies indicate the vast...
    Resource Type:
    Masters Thesis
    Full Text:
    Highway Runoff Abstract approved: Jeffrey A. Nason Low levels of copper have been shown to

  • Heteroaggregation between citrate-stabilized gold nanoparticles and hematite colloids : mechanisms and quantification of nanoparticle-colloid interactions

    Creator:
    Smith, Brian M.
    Abstract:
    Understanding the aggregation behavior of engineered nanomaterials (ENMs) in aqueous environments is essential to understanding their fate, transport, and toxicity. Because naturally occurring colloids will likely be present at much higher concentrations than ENMs in environmental systems, heteroaggregation and attachment with these natural colloids could significantly influence ENM fate and...
    Resource Type:
    Masters Thesis
    Full Text:
    Abstract approved: _____________________________________________________________________ Jeffrey A

  • Heteroaggregation of gold nanoparticles with model colloids and the influence of environmental aqueous chemistry

    Creator:
    Pike, Daniel J.
    Abstract:
    Nanoparticles are becoming increasingly important in numerous technological fields but evidence shows that they can be toxic to many organisms. To predict their fate and transport in the environment, nanoparticle attachment to naturally occurring colloids must be examined. This study investigated citrate-capped gold nanoparticle (Cit-AuNP) heteroaggregation with two model colloids...
    Resource Type:
    Masters Thesis
    Full Text:
    : ______________________________________________________ Jeffrey A. Nason Nanoparticles are becoming increasingly important in numerous