Feasibility of polarographic determination of phenols at graphite electrodes
Solid electrodes are being used more and more widely in polarographic analysis due not only to the fact that they are simple to handle (in comparison with mercury drip electrodes) and nontoxic, but also to the fact that they expand the capabilities of the polarographic method, especially in the anodic region. Solid (graphite and metal) electrodes can be polarized to the point where oxygen is evolved from aqueous solutions (+1.3 V). However, the use of solid anodes for polarographic determination of organic compounds involves a number of difficulties related to the diffusion kinetics and the change in the surface state of solid electrodes during anodic polarization. We studied the oxidation of phenols at solid (platinum and graphite) anodes. As polarography progressed, the electrode surface became coated with a dense film of oxidation products, so that it had to be cleaned before each determination. The electrode was adequately cleaned and gave reproducible results only when heated in a flame to red heat. After analyzing the data in the literature, we decided to test a graphite electrode. A series of experiments showed that graphite electrodes fabricated by Brainina's method best satisfied our requirements.
- OSTI ID:
- 6316349
- Journal Information:
- Coke Chem., USSR (Engl. Transl.); (United States), Vol. 3
- Country of Publication:
- United States
- Language:
- English
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