A felületi rétegképzödés in situ radioizotópos nyomjelzéses vizsgálata polikristályos aranyelektǒdon Cr(VI)-ionokat tartalmazó vizes oldatokban

Réka Marczona, Lajos Gáncs, I. Szalóki, K. Varga

Research output: Article

2 Citations (Scopus)

Abstract

Results of in situ radiotracer and voltammetric studies on the formation of surface ad-layers in the course of Cr(VI) reduction on gold electrode, and a novel detection and calculation method for the quantitative evaluation of the surface excess of radio labelled Cr species via measurement of the intensity of low energy X-rays (E = 4.90 ke V) emitted by 51Cr are presented. From the experimental results can be concluded: - The electro-reduction of Cr(VI) particles presumably proceeds via a ce (chemical-electron-transfer) mechanism and yield a gold surface covered with intermediate surface ad-layer containing Cr(VI) species and added anions (HSO4-/SO42-, CIO4-). - The extent and mechanism of ad-layer formation are affected by the pH of solution. - The maximum surface excess of Cr-containing species (ΓpH=0 = 1,2×10-9 mol·cm-2, ΓpH=2,0 = 1,6×10-9 mol·cm-2), as well as the molar ratio between the Cr species and HSO4-/SO42- ions (mpH=0 ≈ 6 at E = 0,80 V, mpH=2,0 ≈ 2 at E = 0.05 V) attest that the coverage of the gold surface with intermediate complexes does not exceed one mono layer.

Original languageHungarian
Pages (from-to)88-95
Number of pages8
JournalKorrozios Figyelo
Volume43
Issue number3
Publication statusPublished - 2003

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Gold
Ions
Anions
chromium hexavalent ion
Negative ions
X rays
Electrodes
Electrons

ASJC Scopus subject areas

  • Engineering(all)

Cite this

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title = "A fel{\"u}leti r{\'e}tegk{\'e}pz{\"o}d{\'e}s in situ radioizot{\'o}pos nyomjelz{\'e}ses vizsg{\'a}lata polikrist{\'a}lyos aranyelektǒdon Cr(VI)-ionokat tartalmaz{\'o} vizes oldatokban",
abstract = "Results of in situ radiotracer and voltammetric studies on the formation of surface ad-layers in the course of Cr(VI) reduction on gold electrode, and a novel detection and calculation method for the quantitative evaluation of the surface excess of radio labelled Cr species via measurement of the intensity of low energy X-rays (E = 4.90 ke V) emitted by 51Cr are presented. From the experimental results can be concluded: - The electro-reduction of Cr(VI) particles presumably proceeds via a ce (chemical-electron-transfer) mechanism and yield a gold surface covered with intermediate surface ad-layer containing Cr(VI) species and added anions (HSO4-/SO42-, CIO4-). - The extent and mechanism of ad-layer formation are affected by the pH of solution. - The maximum surface excess of Cr-containing species (ΓpH=0 = 1,2×10-9 mol·cm-2, ΓpH=2,0 = 1,6×10-9 mol·cm-2), as well as the molar ratio between the Cr species and HSO4-/SO42- ions (mpH=0 ≈ 6 at E = 0,80 V, mpH=2,0 ≈ 2 at E = 0.05 V) attest that the coverage of the gold surface with intermediate complexes does not exceed one mono layer.",
author = "R{\'e}ka Marczona and Lajos G{\'a}ncs and I. Szal{\'o}ki and K. Varga",
year = "2003",
language = "Hungarian",
volume = "43",
pages = "88--95",
journal = "Korrozios Figyelo",
issn = "0133-2546",
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TY - JOUR

T1 - A felületi rétegképzödés in situ radioizotópos nyomjelzéses vizsgálata polikristályos aranyelektǒdon Cr(VI)-ionokat tartalmazó vizes oldatokban

AU - Marczona, Réka

AU - Gáncs, Lajos

AU - Szalóki, I.

AU - Varga, K.

PY - 2003

Y1 - 2003

N2 - Results of in situ radiotracer and voltammetric studies on the formation of surface ad-layers in the course of Cr(VI) reduction on gold electrode, and a novel detection and calculation method for the quantitative evaluation of the surface excess of radio labelled Cr species via measurement of the intensity of low energy X-rays (E = 4.90 ke V) emitted by 51Cr are presented. From the experimental results can be concluded: - The electro-reduction of Cr(VI) particles presumably proceeds via a ce (chemical-electron-transfer) mechanism and yield a gold surface covered with intermediate surface ad-layer containing Cr(VI) species and added anions (HSO4-/SO42-, CIO4-). - The extent and mechanism of ad-layer formation are affected by the pH of solution. - The maximum surface excess of Cr-containing species (ΓpH=0 = 1,2×10-9 mol·cm-2, ΓpH=2,0 = 1,6×10-9 mol·cm-2), as well as the molar ratio between the Cr species and HSO4-/SO42- ions (mpH=0 ≈ 6 at E = 0,80 V, mpH=2,0 ≈ 2 at E = 0.05 V) attest that the coverage of the gold surface with intermediate complexes does not exceed one mono layer.

AB - Results of in situ radiotracer and voltammetric studies on the formation of surface ad-layers in the course of Cr(VI) reduction on gold electrode, and a novel detection and calculation method for the quantitative evaluation of the surface excess of radio labelled Cr species via measurement of the intensity of low energy X-rays (E = 4.90 ke V) emitted by 51Cr are presented. From the experimental results can be concluded: - The electro-reduction of Cr(VI) particles presumably proceeds via a ce (chemical-electron-transfer) mechanism and yield a gold surface covered with intermediate surface ad-layer containing Cr(VI) species and added anions (HSO4-/SO42-, CIO4-). - The extent and mechanism of ad-layer formation are affected by the pH of solution. - The maximum surface excess of Cr-containing species (ΓpH=0 = 1,2×10-9 mol·cm-2, ΓpH=2,0 = 1,6×10-9 mol·cm-2), as well as the molar ratio between the Cr species and HSO4-/SO42- ions (mpH=0 ≈ 6 at E = 0,80 V, mpH=2,0 ≈ 2 at E = 0.05 V) attest that the coverage of the gold surface with intermediate complexes does not exceed one mono layer.

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