Cathodic Stripping Voltammetry of Thioamides on a Rotating Silver Disk Electrode.
STATE UNIV OF NEW YORK AT BUFFALO DEPT OF CHEMISTRY
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Cathodic stripping voltammetry at a rotating silver disc electrode has been applied for the determination of five thioamides thioacetamide TAA, thiourea TU, thionicotinamide TNA, ethionamide ETNA, and thiosemicarbazide TSC. Well defined oxidation waves limited by convective diffusion were found at -0.29, -0.12, -0.27, -0.15 and -0.105 V vs SCE for the five amides in a pH 9.2 borate buffer. Stripping peaks appeared at approx. -0.76 V vs SCE, approximately identical to that for S superscript 2-, which, however, produces an oxidation wave at -0.66 V vs SCE. It is suggested that the insoluble compounds formed in the electrode surface are converted to Ag2S. Linear cathodic stripping peak currents were found over a concentration range of approx. .0000001 M to .00001 M. Author
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