Abstract

AbstractA number of pH measurement systems based on quinhydrone and related compounds have been investigated for their possible use in studies of localized conditions occurring in crevices, stress corrosion cracks, and similar situations. These systems offer the advantage of using a robust electrode of a noble metal as the pH sensitive electrode, which can be made very small. However, they do require a source of the quinhydrone in solution, and this may limit their applicability. Quinhydrone is also limited to neutral and acid solutions, which proved to be a problem in the specific case of crevice chemistry of steels in sea water. Attempts to improve the performance in alkaline solutions by additions to the quinhydrone ring were partially successful, although the compound thus formed was significantly less soluble than quinhydrone, and this gave rise to difficulties in the development of stable potentials. Practical application of the quinhydrone electrode has focused on a semimicro electrode, which can b...

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