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1 Polish Journal of Chemistry

1 1999

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Adsorption of L-histidine from aqueous solutions on the mercury electrode and air/solution interface

Słojkowska R., Jurkiewicz-Herbich M.

Polish Journal of Chemistry

1999

vol. 73 nr 3

527-539

The differential capacitance characteristics of (Hg/0.1 mol dm-3KF and Hg/0.1 mol dm-3 LiClO4 interfaces were studied in the presence of L-histidine (His). The strongest adsorption of His on yhe mercury electrode was observed in solutions at pHł8. Probably, it results from the strong interactions between mercury and His molecules possessing in these solutions one or two deprotonated nitrogen atoms in the imidazole ring. Quantitative analysis of the data was possible for the alkaline solutions only. The anomalies observed in the course of C-E curves in the neutral or acidic solutions are discussed. Adsorption of His on a free surface is very weak. Practically it results from the salting-out effect, because, in the case of the solutions without the electrolyte, the His molecules do not adsorb at this interface.