Graduation Year

2016

Date of Thesis Acceptance

Spring 5-11-2016

Major Department or Program

Chemistry

Advisor(s)

Dr. Nathan E. Boland

Abstract

Chelate exchange reactions often control the bioavailability of trace metal ions in soils. Soils contain many possible ligands, such as oxalate, in addition to the primary reactants – strong chelating agents (e.g. siderophores and synthetic chelating agents). Here we explore the influence of oxalate on the pathway and rate of ligand exchange between nickel(II) nitrilotriacetic acid (NiNTA) and 1,2-cyclohexylenedinitrilotetraacetic acid (CDTA). Capillary electrophoresis was used to monitor the changes in free chelating agent and nickel-chelating agent concentration over time at different pHs and reactant concentrations. Below pH 8, the presence of oxalate moderately catalyzes the reaction, whereas above pH 8, the reaction is moderately inhibited. The increase or decrease in rates at each pH increases in magnitude with increasing oxalate concentration. Kinetic modeling is used to support a proposed reaction pathway for this chelate exchange reaction in the presence of oxalate.

Page Count

86

Subject Headings

Chemistry, Organic -- Experiments, Chelates -- Analysis, Oxalic acid, Nickel oxide, Nitrilotriacetic acid, nickel(II) nitrilotriacetic acid (Ni NTA), 1, 2-cyclohexylenedinitrilotetraacetic acid (CDTA), Capillary electrophoresis -- Technique, Whitman College 2016 -- Dissertation collection -- Chemistry Department

Permanent URL

http://hdl.handle.net/10349/201608121305

Document Type

Public Accessible Thesis

Terms of Use

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Available for download on Friday, May 11, 2018

Included in

Chemistry Commons

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