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ELECTROCHEMICALLY DEPOSITED POLYMER-COATED GOLD ELECTRODES SELECTIVE FOR 2,4-DICHLOROPHENOXYACETIC ACID
Citation:
WEETALL, H., D. W. HATCHETT, AND K. R. ROGERS. ELECTROCHEMICALLY DEPOSITED POLYMER-COATED GOLD ELECTRODES SELECTIVE FOR 2,4-DICHLOROPHENOXYACETIC ACID. ELECTROANALYSIS. Wiley-VCH, Weinheim, Germany, 17(19):1789-1794, (2005).
Impact/Purpose:
The overall objective of this task is to develop scientifically sound sampling and bioanalytical approaches for screening and monitoring of hazardous wastes. These techniques are expected to provide the Agency with improved screening and field portable methods to characterize, reduce, and control risk to human health and the environment. Specific objectives will include development and characterization of the following concepts:
SPMDs for passive accumulation of TICs
Bioassays for toxic and genotoxic compounds
MIPs for volatile and semivolatile toxic organics
Rapid screening assays using the previously listed components.
Description:
Electropolymerized membranes on gold electrodes doped with 2,4-dichlorophenoxyacetic acid (2,4-D) were prepared from a solution containing resorcinol, o-phenylenediamine and 2,4-D. Fourier Transform Infrared (FTIR) spectroscopy was used to evaluate the incorporation and interaction of 2,4-D with the polymer matrix prior to and after the sensing experiments. The FTIR data indicate that 2,4-D does not leach appreciably from the polymer matrix under experimental conditions employed for the sensing studies. The electrochemical current response for 2,4-D is compared for the doped polymer-coated and control polymer-coated electrode. The response of the doped polymer-electrode was dependent on increasing concentrations of 2,4-D and 2,4-dichlorophenol while unresponsive to benzoic acid.