Voltammetric determination of agriculturally-significant benzenearsonic acids |
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Authors: | Marc Andrews William E Geiger |
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Affiliation: | Department of Chemistry, University of Vermont, Burlington, VT 05405 U.S.A. |
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Abstract: | Direct current and differential pulse polarographic measurements are reported on a series of substituted benzenearsonic acid compounds that are important in agricultural applications. Compounds studied were o-aminobenzenearsonic acid, p-aminobenzene-arsonic acid, p-nitrobenzenearsonic acid, p-ureidobenzenearsonic acid, and 3-nitro-4-hydroxybenzenearsonic acid. Polarographic reduction potentials varied with pH for all compounds, shifting to more negative values as the pH was increased. Although diffusion-controlled reduction waves were observed in all cases, some compounds exhibited a dependence of E on concentration, especially at relatively high concentrations. Differential pulse polarographic peak currents were proportional to concentration from 10-4 M to 10-6 M. |
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