A Cathodic Stripping Square-Wave Voltammetry of a Second-Order Redox Reaction and Its Application to the Mercury-Cysteine System

Mirčeski, Valentin; Lovrić, Milivoj

doi:10.1002/(sici)1521-4109(199810)10:14<976::aid-elan976>3.0.co;2-0

Cited by 24 publications

(12 citation statements)

References 44 publications

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“…In our previous publication [14] we demonstrated that which appear at more negative and more positive potentials, respectively) does not depend significantly on the SW amplitude and its average value is 0.9490.04.…”

Section: Resultsmentioning

confidence: 70%

Square-wave voltammetry of 5-fluorouracil

Mirčeski

Gulaboski

Jordanoski

et al. 2000

Journal of Electroanalytical Chemistry

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The redox reaction of 5-fluorouracil (FU) at a hanging mercury drop electrode (HMDE) is studied by means of square-wave voltammetry (SWV). It is demonstrated that the redox reaction proceeds according to the scheme:− , which involves both chemisorption of FU on the electrode surface and creation of a sparingly soluble compound with the electrode material. The overall response exhibits properties of a surface process in which both the reactant and the product of the redox reaction are immobilized on the electrode surface. The square-wave voltammetric response of FU possesses features typical of surface confined processes such as 'split SW peaks' and a 'quasi-reversible maximum'. The proposed electrode mechanism is studied theoretically. The numerically calculated response under conditions of SWV is in qualitative agreement with the experimental data. Comparing the theoretical and the experimental data, the kinetic parameters of the redox reaction investigated are estimated. The standard rate constant appears to be within the interval 545 k s /s − 1 5 108, the adsorption constant is K =10 cm − 1 , and the transfer coefficient is h =0.549 0.01. The effect of the Cu(II) ions on the adsorptive SWV response of FU is discussed from an analytical point of view. It is demonstrated that SWV is a particularly appealing technique, which enables determination of FU at an ultra-trace concentration level. A linear calibration plot was established at 10 − 11 mol l − 1 concentration level with a correlation coefficient of R 2 = 0.992. The detection limit is 7.7× 10 − 12 mol l − 1 . The reproducibility of the results in terms of the relative standard deviation ranges from 0.9 to 3.2%.

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Section: Resultsmentioning

confidence: 70%

Square-wave voltammetry of 5-fluorouracil

Mirčeski

Gulaboski

Jordanoski

et al. 2000

Journal of Electroanalytical Chemistry

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“…The latter mechanism is known as the cathodic stripping reaction of second order [12]. Numerous inorganic ions, such as halides [13 ± 17], cyanide [18], thiosulfate and sulfite [19] as well as some of the sulfur containing organic compounds, such as miscellaneous thiols [20 ± 25] and thioamides [26] react according to the Reaction II.…”

Section: Hg (L) L 2àmentioning

confidence: 99%

“…In the present paper, utilizing the recently developed theoretical models [11,12,33,34] a comparative analysis of all four electrode mechanisms under conditions of SWV is presented. The aim of the study is to establish simple diagnostic criteria for qualitative recognizing and distinguishing the type of the cathodic stripping reaction.…”

Section: Hg (L) L 2àmentioning

confidence: 99%

Square‐Wave Voltammetry of Cathodic Stripping Reactions. Diagnostic Criteria, Redox Kinetic Measurements, and Analytical Applications

et al. 2004

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A comparative study of different types of cathodic stripping reactions under conditions of square-wave voltammetry is presented. Cathodic stripping processes involving reactions of second order as well as reactions coupled by adsorption of the reacting ligand are analyzed The inherent parameters, controlling the overall voltammetric behavior of each cathodic stripping electrode reaction are derived. The criteria for qualitative distinguishing of each mechanism are established as well as a methodology for redox kinetic measurements is proposed. The influence of the parameters of the excitation signal on the properties of the voltammetric response is analyzed in order to find optimal conditions for analytical application. The theoretical results are illustrated by the experiments with a series of uracil derivatives.

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“…The scientific interest for the theoretical examination of the cathodic stripping processes has significantly raised in the recent years [4, 5, 12 ± 15]. Thus, we have recently studied theoretically the cathodic stripping process of second order (Reaction II) [14] as well as the cathodic stripping reaction of first order coupled by adsorption of the reacting ligand (Reaction III) [4].…”

Section: Introductionmentioning

confidence: 99%

“…This mechanism is of particular interest, since many organic compounds reacting as monovalent ligands are capable to adsorb on the electrode surface [3,14]. The aim of this work is to investigate the relationships between the properties of the SW voltammetric response and both the redox kinetic parameters and parameters of the excitation signal.…”

Section: Introductionmentioning

confidence: 99%