Abstract
Abstract Polarograms of fluorescein in normal hydrochloric acid are asymmetrical and can be split into two parts by logarithmic analysis. The latter portion plotted against bulk concentration exhibits the behaviour of a post-wave. Electrocapillary data also indicate adsorption of the depolarizer at the dme. Relatively low value of diffusion-current constant in 33% acetic acid solutions as compared with that in aqueous buffers was proved, by viscometric studies, to be due to the presence of fluorescein as dimer in this medium. This was supported by derivation and use of an equation obtained by applying steady-state treatment to the problem. Polarograms in aqueous buffers (pH 6.25) indicate the formation of semiquinone dimer, the value of the dimerization constant being 9.87 l/mM.
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