Abstract
AbstractThe oxidation of adsorbed SPO33− during the positive potential scan at a gold electrode is a major contributor to the total anodic signal that is catalyzed by formation of surface oxide. The number of electrons for oxidation of SPO33− in both the adsorbed (nads) and solution (nsoln) states was determined to be 6 equiv mol−1 on the basis of double‐step chronocoulometry in a thin‐layer cell. The products are concluded to be PO32− and SO43− on the basis of these n values, 31P NMR spectra, and a positive BaCl2 test for sulfate. The adsorption of SPO33− on Au is concluded to be consistent with the Langmuir isotherm to a coverage of θ = ca. 0.9, which is achieved for 0.6 mM Na3SPO3.
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