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Pseudopolarography of Trace Metals. Part III. Determination of Stability Constants of Labile Metal Complexes

Dario Omanović

Puni tekst: engleski, pdf (576 KB) str. 67-76 preuzimanja: 923* citiraj
APA 6th Edition
Omanović, D. (2006). Pseudopolarography of Trace Metals. Part III. Determination of Stability Constants of Labile Metal Complexes. Croatica Chemica Acta, 79 (1), 67-76. Preuzeto s https://hrcak.srce.hr/2606
MLA 8th Edition
Omanović, Dario. "Pseudopolarography of Trace Metals. Part III. Determination of Stability Constants of Labile Metal Complexes." Croatica Chemica Acta, vol. 79, br. 1, 2006, str. 67-76. https://hrcak.srce.hr/2606. Citirano 08.03.2021.
Chicago 17th Edition
Omanović, Dario. "Pseudopolarography of Trace Metals. Part III. Determination of Stability Constants of Labile Metal Complexes." Croatica Chemica Acta 79, br. 1 (2006): 67-76. https://hrcak.srce.hr/2606
Harvard
Omanović, D. (2006). 'Pseudopolarography of Trace Metals. Part III. Determination of Stability Constants of Labile Metal Complexes', Croatica Chemica Acta, 79(1), str. 67-76. Preuzeto s: https://hrcak.srce.hr/2606 (Datum pristupa: 08.03.2021.)
Vancouver
Omanović D. Pseudopolarography of Trace Metals. Part III. Determination of Stability Constants of Labile Metal Complexes. Croatica Chemica Acta [Internet]. 2006 [pristupljeno 08.03.2021.];79(1):67-76. Dostupno na: https://hrcak.srce.hr/2606
IEEE
D. Omanović, "Pseudopolarography of Trace Metals. Part III. Determination of Stability Constants of Labile Metal Complexes", Croatica Chemica Acta, vol.79, br. 1, str. 67-76, 2006. [Online]. Dostupno na: https://hrcak.srce.hr/2606. [Citirano: 08.03.2021.]

Sažetak
Suitability of the pseudopolarographic approach for determination of the stability constants of labile metal complexes at low metal concentrations is explored. It is shown that the methodology based on the DeFord-Hume principle can be successfully applied to treat data obtained from pseudopolarograms. For reversible electrochemical systems, such as thallium(I)–chloride or cadmium(II)–chloride, the half-wave potential of a pseudopolarogram, or the corresponding "critical" potential, can be used to calculate the stability constants. A "formal" potential, evaluated by manual fitting of experimental and simulated (pseudo)polarograms, or a potential in a range where all curves yield a reversible slope, can be used as the "critical" potential. For systems in which reversibility of the electrochemical reaction changes (zinc(II)–oxalate and bismuth( III)–chloride), the shift of the half-wave potential depends both on the complexation parameters and on reversibility of the electrochemical reaction. Therefore, in such cases only the "critical" potential can be used for determination of stability constants. All calculated stability constants presented in the paper are in good agreement with the literature values. The benefit of using pseudopolarographic approach lies in the minimization of various effects (such as precipitation, adsorption, ligand excess, etc.), which can influence determination of stability constants at higher metal concentrations.

Ključne riječi
pseudopolarography; metal speciation; stripping voltammetry; stability constants

Hrčak ID: 2606

URI
https://hrcak.srce.hr/2606

[hrvatski]

Posjeta: 1.347 *