Naslov
Study of cadmium interaction with humic acid at the mercury/water interface

Autori
Plavšić, Marta ; Ćosović, Božena

Izvornik
Marine chemistry (0304-4203) 36 (1991), 1/4; 39-49

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
cadmium ; humic substances ; mercury electrode

Sažetak
The influence of humic acid on the cathodic (reduction) and the anodic (oxidation) waves of cadmium was examined by electrochemical methods. At low pH values (pH= 1.6) the decrease of both the cathodic and anodic waves of cadmium follow the adsorption isotherm of humic acid (HA) studied, because the adsorbed layer of the protonalcd HA represents a barrier for the interaction of cadmium with the electrode surface. At higher pH values (pH=6.7 and 9.0) the influence of HA on the cathodic and anodic wave of cadmium is completely different. While the anodic wave of cadmium became gradually suppressed in the presence of humic acid the cathodic wave increased high above the initial height of the cadmium reduction wave without the presence of humic acid. It is supposed that before the formation of the Cd−HA complex in solution the binding of cadmium on the electrode surface occurs which leads to this increase in relative height of the cadmium reduction wave. This feature is dependent on the pH of solution, ionic strength and the presence of major ions (chloride, calcium, and magnesium ions).

Izvorni jezik
Engleski

Znanstvena područja
Geologija

POVEZANOST RADA