Quantitative study of the reaction between quinones and iron(II) in phosphoric acid medium.
A simple method is described for the determination of some quinones with ammonium iron(II) sulphate, by titration potentiometrically or with cacotheline, Methylene Blue, Methylene Green, thionine, Toluidine Blue, Azure A, Azure C or Azure-2-eosin as redox indicators. The reverse titrations can be used for estimation of iron(II). Alternatively, excess of iron (II) can be added and the iron(III) produced determined colorimetrically with thiocyanate.
Murty
N K
NK
Department of Engineering Chemistry, Andhra University, Waltair 530 003, India.
Dakshina Murty
P M
PM