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Filtering by: Subject Water--Dissolved oxygen Remove constraint Subject: Water--Dissolved oxygen Degree Name Doctor of Philosophy (Ph.D.) Remove constraint Degree Name: Doctor of Philosophy (Ph.D.)

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  • Design, characterization, and application of spectrometers for determination of low-level dissolved oxygen with small-volume sampling methodology

    Creator:
    Cakin, Defne
    Abstract:
    New analytical methods and instrumentation were developed for the determination of dissolved oxygen (DO) at low concentrations in water. The methods were based on monitoring the absorbance increase due to the oxidation of reduced indigo carmine (IC) by oxygen in the sample in different types of spectrometer cells. Spectrophotometer cells...
    Resource Type:
    Dissertation
    Full Text:
    determination of dissolved oxygen (DO) at low concentrations in water. The methods were based on monitoring

  • Integrating solute transport, metabolism and processing in stream ecosystems

    Creator:
    González Pinzón, Ricardo A.
    Abstract:
    After three decades of active research coupling hydrology and stream ecology, the connection among solute transport, metabolism and processing is still unresolved. These knowledge gaps obscure the functioning of stream ecosystems and how those ecosystems interact with other landscape processes. We must resolve these challenges to wisely manage water resources,...
    Resource Type:
    Dissertation
    Full Text:
    dissolved oxygen) with proxy-tracers (such as resazurin), and show that even if both the target and 5

  • Dynamics of organic matter production and degradation during coastal diatom blooms

    Creator:
    Wetz, Michael S.
    Abstract:
    Experiments were designed to answer key questions about diatom-derived organic matter cycling (i.e., production and degradation) in coastal systems. Dissolved organic matter (DOM) production was examined in axenic batch cultures of five diatom species. Dissolved organic carbon (DOC) release rates varied between species, but were significantly higher for all species...
    Resource Type:
    Dissertation
    Full Text:
    . Finally, because of its lability, the POC will contribute to shelf bottom water oxygen utilization as it

  • Coulometric determination of dissolved oxygen

    Creator:
    Healy, Michael Lyon
    Abstract:
    Many different aspects of the determination of dissolved oxygen by controlled potential coulometry were investigated to find a means of measuring the oxygen content of natural waters. Rapid sampling techniques, simplicity of operation, and rugged structural features were stressed. Cells were designed to operate by either internal electrolysis or external...
    Resource Type:
    Dissertation
    Full Text:
    - vanometer is proportional to dissolved oxygen concentration when the cell is immersed in sea or lake water

  • Influence of upwelling-season coastal currents on near-bottom dissolved oxygen concentrations over a submarine bank

    Creator:
    Adams, Katherine A.
    Abstract:
    Wind-driven coastal upwelling brings subsurface water onto the central-Oregon shelf after the spring transition each year. This cold and salty source water is oxygen-poor, yet above the hypoxic threshold, dissolved oxygen < 1.4 ml l⁻¹. Once on the shelf, dissolved oxygen (DO) concentrations of upwelled near-bottom waters are modified by...
    Resource Type:
    Dissertation
    Full Text:
    water column where microbial respiration consumes dissolved oxygen (DO). Near-bottom DO concentrations