Abstract
Flade potentials if iron and redox potentials of the Fe3+/Fe2+ system have been determined in de-aerated sulphate solutions, pH 3–5, and the effect of air on the Flade potential of iron in borate buffers, pH 6–9, has been examined.
The results extend the range of previous work and it is sho, wn that under anaerobic conditions over the pH range 3–5 the Flade potential is given by EF = 0·960 − 0·158pH − 0·064 log Fe2+whereas in the presence of air, in the pH range 7· 0−9·3, the normal Flade equation is obeyed.It is concluded that the Flade potential corresponds to the redox potential of the Fe3+/Fe2+ system, both in the presence and absence of air, the effect of oxygen being to modify the ferrous ion concentration.
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