Potentiometric Study of the Nucleation of Cu2o after Its Formation from Fehling Solutions and Reducing Sugars
(EN)
Nanos, C. G.
(EN)
Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας
(EL)
Nanos, C. G.
(EN)
The oxidation of glucose by Fehling solution was followed by various solid-state ion-selective electrodes. The shape of the recorded potential vs. time transient curves at three different electrodes (Cu2+, Pb2+, and Ag+/S2-) was explained on the basis of the known mechanisms of formation of precipitates, the growth of crystals, and adsorption/desorption phenomena. The curves are peculiar in shape, are very reproducible, and show three distinct parts. The potential changes of the electrodes are due to the consumption of OH- during the reaction, as well as to its adsorption and desorption on the Cu2O precipitate. The effects on the values of different curve parameters of the concentrations of glucose, OH-, and K,Na-tartrate, as well as the temperature, were studied.
(EN)
