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South African Journal of Chemistry

versão On-line ISSN 1996-840X
versão impressa ISSN 0379-4350

S.Afr.j.chem. (Online) vol.63  Durban  2010

 

RESEARCH ARTICLE

 

An investigation of the interaction between resazurin and Cd2+ and Zn2+ ions in aqueous medium

 

 

Emine Yimaz Arslan; Semiha Çakir*

Department of Chemistry, Faculty of Arts & Science, Gazi University, 06500 Teknikokullar-Ankara, Turkey

 

 


ABSTRACT

The voltammetric behaviour of resazurin in the presence of Cd2+ and Zn2+ ions at a hanging mercury drop electrode (HMDE) was investigated by using square wave voltammetry (SWV), cyclic voltammetry (CV) and adsorptive square wave voltammetry (AdsSWV). The interaction of resazurin with Cd2+ and Zn2+ starts above pH 4 and seems to be completed at pH 5.2 with Cd2+ ions and at pH 7.5 with Zn2+ ions. A new peak appears at -0.93 V in the presence of Cd2+ and at -1.07 V in the presence of Zn2+. These peaks may be attributed to M2+-resazurin complexes and the logarithm of their stability constant was determined where log β14 = 4.22 for Cd2+-resazurin and log β1:1 = 4.74 for Zn2+-resazurin. Cyclic voltammetry was used to characterize the redox mechanism and to calculate voltammetric data of M2+-resazurin complexes. The amount of adsorbed M2+-resazurin complexes on the mercury drop electrode surface (Γ) is calculated as 5.48 x 10-12 mol cm-2 for Cd2+-resazurin and 1.10 x 10-11 mol cm-2 for Zn2+-resazurin. The voltammetric data were compared with the data obtained using spectrophotometric methods and were observed to be in good agreement.

Keywords: Resazurin, cadmium, zinc, electrochemistry, spectroscopy, metal complexes


 

 

Full text available only in PDF format.

 

 

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Received 15 June 2010
Revised 27 September 2010
Accepted 10 October 2010

 

 

* To whom correspondence should be addressed. E-mail: scakir@gazi.edu.tr

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