Naslov
Utjecaj "inertnog" HEPES pufera na elektrokemijski odziv kompleksa bakar(II)-salicilaldoksim
(Influence of the "inert" hepes buffer on electrochemical response of the copper(II)-salicylaldoxime complex)

Autori
Cuculić, Vlado ; Mlakar, Marina ; Branica, Marko

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Proceedings / Gojo, M. - Zagreb : Hrvatsko kemijsko društvo, 1998, 85-88

Skup
1. Hrvatski simpozij o elektrokemiji

Mjesto i datum
Varaždin, Hrvatska, 07.09.1998. - 09.09.1998

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Domaća recenzija

Sažetak
The effect of the 4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid (HEPES), so called "inert" buffer, on the redox process of copper(II)-salicylaldoxime complex (Cu(II)-SA) was studied. Measurements were performed on a hanging mercury drop electrode (HMDE) using various electrochemical techniques. The presence of the HEPES buffer (pH = 8.0) increased the reduction current of the Cu(II)-SA complex twice, whereas the reduction potential shifted to more positive values (about 50 mV). The results obtained indicate that the HEPES buffer presence facilitates the electron transfer between the mercury electrode and the adsorbed Cu(II)-SA complex during the reduction process. The experiments carried out using chronocoulometry with a double step potential revealed that the surface coverage of the Cu(II)-SA complex remaines practically unchanged (in the range between 9 and 10.5´10-11 mol cm-2), regardless of the HEPES buffer presence.

Izvorni jezik
Hrvatski

Znanstvena područja
Kemija

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