The effect of cytosine on the two-step electroreduction of Zn2+ ions in acetic buffers

Autor:	Jadwiga Saba, Dorota Gugała, Dorota Sieńko, Jolanta Nieszporek, J. Szaran
Rok vydání:	2006
Předmět:	Polarography Electron transfer chemistry.chemical_compound Reaction rate constant Aqueous solution Chemistry General Chemical Engineering Inorganic chemistry Electrochemistry Concentration effect Buffer solution Dropping mercury electrode
Zdroj:	Electrochimica Acta. 51:2278-2281
ISSN:	0013-4686
DOI:	10.1016/j.electacta.2005.03.079
Popis:	Cytosine plays an important role in many biological processes since it constitutes the buildings blocks of DNA and RNA. A two-step reduction of Zn 2+ ions at the dropping mercury electrode in acetic buffers at pH 4 and 5 in the presence of cytosine was examined. The measurements were performed using an impedance method in a wide potential and frequency ranges. The values of the standard rate constants k s in the both studied system decrease from 3.8 × 10 −3 to 2 × 10 −3 cm s −1 at pH 4 and from 5.1 × 10 −3 to 2.5 × 10 −3 cm s −1 at pH 5. The values of the standard rate constants k s1 characterizing the stage of the first electron transfer decrease similarly. However, the values of the standard rate constants k s2 characterizing the stage of the second electron exchange decrease more markedly in the buffer at pH 4 than in the buffer at pH 5.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::d84d61d4bdac5981d1dd76e0449ff37f https://doi.org/10.1016/j.electacta.2005.03.079 Zobrazit plný text záznamu Full Text from ScienceDirect