The anodic reactions at mercury electrodes due to cysteine

Heyrovský, Michael; Mäder, P.; Vavřička, S.; Veselá, Věra; Fedurco, Milan

doi:10.1016/s0022-0728(97)00103-4

Cited by 95 publications

(78 citation statements)

References 35 publications

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“…13,14 From electrocapillary measurements 14 results that for cysteine concentrations higher than 0.5·10 −3 mol dm −3 more protons are released in the electrode reaction, the products become more protonated and at the negative side of the adsorption region (about -200 mV) the formation of the orien-ted surface layer of mercurous thiolate 2 2 Hg (SR) proceeds. Going towards the more positive potentials, where the reaction …”

Section: Resultsmentioning

confidence: 99%

“…It seems that the mechanism proposed by Stankovich and Bard 12 as well as Heyrovsky and co-workers 13,14 explains best of all the cysteine-mercury interaction.…”

Section: Introductionmentioning

confidence: 91%

“…14 For the identical cysteine concentrations with the increase of chlorate (VII) concentration from 1 mol dm −3 to 8 mol dm −3 (water activity is changing from 0.962 to 0.543) 31 , the hump at…”

Section: Hg (Sr) + 2rsh 2hg(sr) 2e 2hmentioning

confidence: 99%

“…14,15 Lovrić and co-workers 16,17 and Piech 18 consider the processes of cysteine mercury thiolates forming as a formation of the deposit of sparingly soluble salt on the electrode surface, the same as the sedimentation of 2 2 Hg Cl or HgS . Whereas the other authors consider this process as the electrosorption reaction in which the ligand RS  is adsorbed at the electrode surface by forming a more or less polarized covalent bond with mercury atoms.…”

Section: Introductionmentioning

confidence: 99%

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The Influence of Water Activity on Double Layer Parameters on the Interface Mercury/Chlorates (VII) in the Presence of Cysteine

Nosal‐Wiercińska¹

2013

Croat. Chem. Acta

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Abstract. The influence both the cysteine concentration and water activity on the double layer parameters on the interface mercury/ chlorates (VII) was examined. The adsorption parameters for the double layer were calculated from a double-layer differential capacity measurement extrapolated to zero frequency.The values of the relative surface excess increase of the cysteine concentration and chlorates (VII) solutions. It was found that the values of free adsorption energy and interactions constants, obtained from Frumkin and virial isotherms, depend on the supporting electrolyte concentration. The changes of determined parameters in the function of water activity water point at the participation of

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Section: Resultsmentioning

confidence: 99%

“…It seems that the mechanism proposed by Stankovich and Bard 12 as well as Heyrovsky and co-workers 13,14 explains best of all the cysteine-mercury interaction.…”

Section: Introductionmentioning

confidence: 91%

Section: Hg (Sr) + 2rsh 2hg(sr) 2e 2hmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The Influence of Water Activity on Double Layer Parameters on the Interface Mercury/Chlorates (VII) in the Presence of Cysteine

Nosal‐Wiercińska¹

2013

Croat. Chem. Acta

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“…Taking into account the potential value and the shape, the first wave can be attributed to the anodic mercury dissolution that compounds with high affinity for mercury undergo [18][19][20][21]. Moreover, two cathodic peaks that can be attributed to adsorption and desorption of the products formed can be observed in cyclic voltamperometry, in a similar way that it occurs with 8-hydroxyquinoline [18].…”

Section: Scheme Of Reductionmentioning

confidence: 90%

Electrochemical study of the metal extractant 4-chloro-N-8-quinolinylbenzenesulfonamide

Huebra

Elizalde

2011

Eur. J. Chem.

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KEYWORDSThe electrochemical behaviour of the reagent 4-chloro-N-8-quinolinylbenzenesulfonamide has been studied by sampled direct current and differential pulse polarography as well as by cyclic voltamperometry techniques. Three reduction waves are obtained and the reversibility and nature of the electrodic processes are discussed. The first and third reduction waves have been explained through chemical reactions and adsorption processes involving the interaction with mercury as electrodic material, whereas the second wave is attributed to the reduction process of the reagent itself. Acidity constant values of the compound in 0.1 M KCl / 25 % methanol medium through polarographic measurements are also given. The influence of the addition of copper to the hydroalcoholic solution in the electrochemical reduction of the reagent is also described.

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Voltammetric Methods for Speciation of Plant Metallothioneins

1998

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Cd, Cu and Zn complexes of two synthetically prepared peptides, (g-Glu-Cys) 2 -Gly and (g-Glu-Cys) 3 -Gly, were studied as models of plant metallothioneins by several voltammetric methods. Reduction peak of the complex in which the stechiometric ratio of molar concentrations of Cd(II) and peptide corresponds to coordination of one Cd(II) by four sulfur atoms (E p = ¹814 mV to ¹910 mV, DPV) is suitable for speciation. CSV after adsorption of Cu(I) complex on HMDE is also convenient, and two peaks (E p = ¹817 mV to ¹850 mV and E p = ¹940 mV to ¹953 mV) are attributed to plant MT with Cu(I). Cd and Cu complexes can be distinguished by different dependences for adsorptive accumulation of complexes on HMDE. In both cases the presence of zinc ions interferes with voltammetric speciation. Results of voltammetric studies were applied to the analysis of algal extracts, prepared from alga Chlorella, which was grown in cadmium enriched medium. Successful voltammetric identification of plant metallothionein in this type of material has been performed, in agreement with results from AAS and UV spectroscopy.

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The anodic reactions at mercury electrodes due to cysteine

Cited by 95 publications

References 35 publications

The Influence of Water Activity on Double Layer Parameters on the Interface Mercury/Chlorates (VII) in the Presence of Cysteine

The Influence of Water Activity on Double Layer Parameters on the Interface Mercury/Chlorates (VII) in the Presence of Cysteine

Electrochemical study of the metal extractant 4-chloro-N-8-quinolinylbenzenesulfonamide

Voltammetric Methods for Speciation of Plant Metallothioneins

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