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  3. The influence of a metal oxide surface on ligand exchange reactions between strong chelating agents
Title

The influence of a metal oxide surface on ligand exchange reactions between strong chelating agents

    Item Description
    Limited Access
    The author(s) chose to restrict access to this thesis to current Whitman students, faculty, and staff. Please log in to view it.
    Linked Agent
    Creator (cre): Conrad, Janni P.
    Advisor (adv): Boland, Nate
    Department (dpt): Whitman College. Chemistry Department
    Date
    May 13, 2015
    Graduation Year
    2015
    Abstract

    Agricultural, pulp and paper mill, and medical industries use synthetic aminocarboxylates called chelating agents to bind metal ions and control metal ion concentrations. These chelating agents often make their way into the environment where they can influence the distribution of metal species. One process that is affected is the exchange of the metal ion between chelating agents by a ligand exchange reaction. Our research examines how a surface, such as titanium dioxide (TiO₂), may affect the exchange of nickel between CDTA and EDTA, two common chelating agents. By examining the kinetics of these exchange reactions using capillary electrophoresis (CE) we hope to understand the role of surfaces in the exchange mechanism. As a first step to understanding the mechanism, we characterize the TiO₂ surface through various methods including measuring the number of reactive surface sites and the extents of adsorption of nickel, CDTA, EDTA, NiCDTA, and NiEDTA in TiO₂ suspensions at varying pH using CE and Atomic Absorption Spectroscopy.

    Subject
    Chelating Agents
    EDTA (chelating agent) -- Ethylenediaminetetraacetic acid
    Ethylenediaminetetraacetic acid -- Environmental aspects
    CDTA -- Trans-cyclohexane-ethylenediamine-tetraacetic acid
    Nickel -- NiEDTA
    Nickel -- NICDTA
    Titanium dioxide -- TiO₂
    Capillary electrophoresis -- Technique
    Atomic absorption spectroscopy
    Science
    Academic theses
    Whitman College 2015 -- Dissertation collection -- Chemistry Department
    Genre
    Theses
    Extent
    45 pages
    Permanent URL
    http://works.whitman.edu/20151123
    Rights
    http://rightsstatements.org/vocab/InC/1.0/
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