Quantification of Cr(VI)-Thymoquinone Complex Using Cyclic Voltammetry

Autor:	Farah Kishwar, Nasir Akhtar, Anila Anwar, Khalid Mohammed Khan, Rubina Perween
Rok vydání:	2016
Předmět:	chemistry.chemical_compound chemistry General Physics and Astronomy General Materials Science Physical and Theoretical Chemistry Cyclic voltammetry Mathematical Physics Thymoquinone Nuclear chemistry
Zdroj:	Pakistan Journal of Scientific & Industrial Research Series A: Physical Sciences. 59:76-82
ISSN:	2223-2559 2221-6413
Popis:	Quantitative studies of Cr(VI)- thymoquinone complex have been performed by cyclic voltammetry. For this purpose glassy carbon, platinum and saturated calomel electrodes were used as working, auxiliary and reference electrodes, respectively. The effects of concentrations and metal-ligand ratios on Cr(VI)- thymoquinone complex were investigated. Effect of concentration was found to follow Randles-Sevcik equation. Calibration curve method with linear regression line confirms that cyclic voltammetry can be used for quantification of Cr(VI)-thymoquinone complex for pharmaceutical assay. Complete complex formation seems to occur at metal ligand ratio 1:1. Results indicate quasi-reversible electron transfermechanism. E° and diffusion coefficient of complex at different concentrations and metal ligand ratios were also calculated and found to be 0.244±0.01 V and 3.45´10-5 cm2s-1, respectively. The values of transfer coefficients, a and b, were found to be 0.716±0.02-1.231±0.01 and 0.814±0.01-0.906±0.01, respectively.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::084aa255c8b4f7c463d52f08e4ae0fc1 https://doi.org/10.52763/pjsir.phys.sci.59.2.2016.76.82 Zobrazit plný text záznamu Plný text ve formátu PDF