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  • Polymeric submicron optical ion-selective sensors

    Creator:
    Bychkova, Valeriya
    Abstract:
    Ion-selective polymeric optical sensors – ion optodes – are a promising alternative to ion-selective electrodes and fluorescent dyes for analytical and biological applications, e.g. extra- and intracellular measurements. They are non-toxic, highly selective robust probes for ionic fluxes monitoring. A large-scale fabrication of ion optodes using a solvent displacement method...
    Resource Type:
    Dissertation
    Full Text:
    acknowledgement is also extended to Dr. John Westall for his continuous help and discussions. The time and

  • In situ transformation of toluene and xylene to benzylsuccinic acid analogs in contaminated groundwater

    Creator:
    Reusser, Dominik E.
    Abstract:
    The rate of removal of benzene, toluene, ethylbenzene and the xylene isomers (BTEX) from contaminated groundwater is needed to design remediation processes. Benzylsuccinic acid (BSA) and methyl-benzylsuccinic acid (methyl BSA) are unambiguous metabolites of anaerobic BTEX biodegradation. An analytical method for quantitative determination of BSA in groundwater samples was developed....
    Resource Type:
    Masters Thesis
    Full Text:
    and John Westall. Thank you to Jack Istok who introduced me to the field of groundwater testing and

  • Surface complexation of protons and sulfate by kaolinite

    Creator:
    Wildensee, Frank
    Abstract:
    The emission of sulfur oxides from anthropogenic sources represents a potential threat to terrestrial ecosystems. Sulfate, the most highly oxidized form of sulfur, is the most common form of inorganic sulfur in most soil environments. The sorption of sulfate may influence the alkalinity of the soil solution and as a...
    Resource Type:
    Masters Thesis
    Full Text:
    . Richard Dick, John Westall, and Thomas Bedell for their suggestions and for serving on my committee

  • Determination of fluorinated alkyl substances in aqueous systems

    Creator:
    Schultz, Melissa M.
    Abstract:
    Fluorinated alkyl substances, which can be persistent, toxic, and bioaccumulative, have been quantitated in many densely populated and remote regions, including in air, surface waters, groundwater, and biota; however, little is known about their transport or behavior in the environment. Wastewater effluent is one of the principal routes for introducing...
    Resource Type:
    Dissertation
    Full Text:
    served on my academic committee: Dr. Vincent Remcho, Dr. John Westall, and Dr. Jeffrey Greenwood. Many

  • Polyion sensors based on induced ion extraction

    Creator:
    Fordyce, Katherine
    Abstract:
    A novel method for detecting the peptidase activity of clinically relevant peptidases was investigated using solid-contact electrochemical polyion sensors under chronopotentiometric control. Complete instrumental control over ion-extraction was accomplished by incorporating a lipophilic electrolyte into the ion-selective membrane; the sensors had no intrinsic ion-exchange capabilities. The sensors were used to...
    Resource Type:
    Masters Thesis
    Full Text:
    commitment shown by all of the members of my graduate committee: Dr. John Westall, Dr. Vince Remcho, and Dr

  • Development, validation and the application of a congener specific photodegradation model for PBDEs

    Creator:
    Zeng, Xia
    Abstract:
    The thermodynamic properties of 39 PBDEs have been calculated using Gaussian 03 on the B3LYP/6-31G(d)//B3LYP/6-31G(d) level. The PBDE congeners' enthalpies of formation increase with increasing number of bromines and show a strong dependence on the bromine substitution pattern. The effects of bromine substitution pattern have been quantitatively studied by GAM...
    Resource Type:
    Dissertation
    Full Text:
    constants for the three different degradation processes are controlled by C-Br bond dissociation energy

  • Mass transfer constraints on the feasability on in situ bioremediation of contaminated groundwater

    Creator:
    Fry, Virginia A., 1959-
    Resource Type:
    Dissertation
    Full Text:
    , John Selker, Lewis Semprini, John Westall and Ken Williamson for their helpful and often enthusiastic

  • Catalytic decomposition of ammonia in a membrane reactor

    Creator:
    Collins, John Patrick, 1959-
    Resource Type:
    Dissertation
    Full Text:
    , Dr. John Westall, Dr. William Warnes, and Dr. Michael Lemer. Dr. Kimura was especially generous in

  • Galvanostatic control of ion selective electrodes with the solvent polymeric membrane

    Creator:
    Perera, Hasini R.
    Abstract:
    Detection technique that proposed utilizing electrochemically controlled, reversible ion extraction into polymeric membrane in an alternating galvanostatic/ potentiostatic mode was introduced. This method is studied in detail to comprehend the advantages of the novel sensor (pulstrode) compared to the potentiometric ion selective electrode (ISE), studies included possible applications and limitations....
    Resource Type:
    Dissertation
    Full Text:
    helped to improve the quality of this work. A sincere thank you is also extended to Dr. John Westall

  • Utilization of natural and supplemental biofuels for harvesting energy from marine sediments

    Creator:
    Nielsen, Mark E.
    Abstract:
    A benthic microbial fuel cell (BMFC) is an electrochemical device that generates current from the redox gradient at the sediment-water interface. Early prototypes had anodes buried in anoxic sediments and cathodes in overlying water. The BMFCs described in this dissertation are based on a chamber design that enables the use...
    Resource Type:
    Dissertation
    Full Text:
    . I was aided by excellent committee members, each of whom contributed to my success. John Westall