Polarographic study of mixed-ligand complex stability constants and kinetic parameters of reduction of Cr(III)-ethylenediamine-succinate system |
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| Affiliation: | 1. Laboratory of Metallic and Semiconducting Materials (LMSM), Department of Mechanical Engineering, University of Biskra, B.P.145, 07000, Biskra, Algeria;2. Laboratory of Materials Physics, Faculty of Physics, University of Sciences and Technology-Houari Boumediene (U.S.T.H.B.), P.O. Box 32, El-Alia, Bab-Ezzouar, DZ-16111, Algiers, Algeria;3. Center for Development of Advanced Technologies, CDTA, Cité du 20 août 1956, Baba-Hassen, 16303 Algiers, Algeria;1. Tianjin Key Lab of Refrigeration Technology, Tianjin University of Commerce, Tianjin 300134, China;2. Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo, Zhejiang Province 315200, China;3. Key Laboratory of Advanced Fuel Cells and Electrolyzers Technology of Zhejiang Province, Ningbo 315200, China;4. Hebei Key Laboratory of Thermal Science and Energy Clean Utilization, Hebei University of Technology, Tianjin 300401, China;1. Dipartimento di Energia, Politecnico di Milano, Via Lambruschini 4, Milano, 20156, Italy;2. Department of Chemical and Biomolecular Engineering, University of Connecticut, 191 Auditorium Road, Unit 3222 Storrs, CT, 06269-3222, USA;3. Center for Clean Energy Engineering, University of Connecticut, 44 Weaver Road, Storrs, CT, 06269-5233, USA;4. Laboratory for Innovation in New Energy Technologies, CEA, 38054, Grenoble, France;5. Department of Materials Science and Engineering, University of Connecticut, Storrs, CT, 06269, USA;1. Department of Physical Medicine and Rehabilitation, Johns Hopkins University, Baltimore, MD;2. Outcomes After Critical Illness and Surgery Research Group, Johns Hopkins University, Baltimore, MD;3. Department of Medicine, Division of General Internal Medicine, Hospitalist Program, Johns Hopkins University, Baltimore, MD;4. Armstrong Institute for Patient Safety and Quality, Johns Hopkins University, Baltimore, MD;5. College of Health Sciences, Division of Communication Sciences and Disorders, University of Kentucky, Lexington, KY;6. National Center for Evidence-Based Practice in Communication Disorders, American Speech-Language-Hearing Association, Rockville, MD;2. University of Bordeaux, ICMCB, UMR 5026, F-33600 Pessac, France;3. University of Bordeaux, CNRS, Arts et Metiers Institute of technology, Bordeaux INP, INRAE, I2M Bordeaux, F-33400 Talence, France |
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| Abstract: | Stability constants of the binary species Cr(III)-ethylenediamine, Cr(III)-succinate and mixed-ligand complex Cr(III)-ethylenediamine-succinate have been determined polarographically by the method of Sundaresan and Sundaram at 30±0.2°C at a constant ionic strength [μ = 0.6 M (NH4ClO4]. The values of the stability constants obtained by this method are compared with those reported in the literature. The positive values of the mixing constants for the mixed-ligand complexes indicate that the mixed-ligand complexes are more stable than simple binary complexes. The reduction of the simple and mixed complexes is irreversible at a dropping mercury electrode: therefore, kinetic parameters like the standard rate constant, transfer coefficient and activation energy have also been calculated. |
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