Abstract
A pyrolytic graphite indicating electrode was fabricated and applied to voltammetry in aqueous solutions. In either acid chloride or acid nitrate medium, it has a useful range of potential from +1.0 to -0.8 volt vs SCE. Reducible ions that have decomposition potentials in this range can be determined. No treatment of the electrode other than a preliminary cleaning is required prior to or during its use. The following ions were determined at the 10/sup -3/M concentration level: Ag(I), Hg(I), Cu(II), UO/sub 2/(II), Fe(III), and Sn(IV). The E/sub 1/2/ and i/sub d//C values are reproducible. The precision obtained in measurements of the various ions is comparable with that of polarography. The voltammetric curves recorded at a scan rate of O.1 volt/minute are characterized by a definite plateau rather than a peak. A reliable and rugged electrode of any reasonable area can be prepared by the technique described.
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