KINETICS OF THALLIUM ACTIVE DISSOLUTION - EFFECT OF SOLUTION COMPOSITIONстатья
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Дата последнего поиска статьи во внешних источниках: 27 мая 2015 г.
Аннотация:Anodic polarization curves are measured on a rotating smooth polycrystalline thallium electrode in the alkaline, sulfate, and acetate solutions of various ionic strength (0.01 - 1.2) and pH (0.5 - 13.8), containing the Tl2SO4 additives (0.1 - 10 mM), in the overpotential range up to 0.15 V. The kinetic currents of active dissolution Tl/Tl(1+) are calculated from the data obtained. The plots of the kinetic current versus the potential obey the Tafel equation (slope b = 130 +/- 20 mV). It is found that, throughout the studied pH range (at a constant concentration of Tl+), the exchange currents i0 are almost independent of pH and rise with an increase in the concentration of background electrolyte stronger than one might expect from manifestation of the psi1 effects. The dependence of i0 on the concentration of Tl+ is somewhat less pronounced in the alkaline medium than in the acid medium. In the studied process, the formation of the intermediate products is assumed, namely weak complexes of Tl+ with the anions of background electrolyte and/or with hydroxide ion.