The Impact of Intermetallic Compounds CuxZn in the Determination of Free Zn2+ Concentration with AGNES

Intermetallic compounds can interfere the determination of free Zn with AGNES (Absence of Gradients and Nernstian Equilibrium Stripping). The “trajectory” (plot of the retrieved currents in front of the deposition times) diverges from the “reference current” (i.e. that unaffected by the interference...

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Published inElectroanalysis (New York, N.Y.) Vol. 22; no. 17-18; pp. 2024 - 2033
Main Authors Chito, Diana, Galceran, Josep, Companys, Encarnació
Format Journal Article
LanguageEnglish
Published Weinheim WILEY-VCH Verlag 01.09.2010
WILEY‐VCH Verlag
Subjects
AGNES
Amalgams
Copper
Deposition
Intermetallic compounds
Intermetallic phases
Intermetallics
Steady state
Stripping
Thermodynamic models
Zinc
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Summary:Intermetallic compounds can interfere the determination of free Zn with AGNES (Absence of Gradients and Nernstian Equilibrium Stripping). The “trajectory” (plot of the retrieved currents in front of the deposition times) diverges from the “reference current” (i.e. that unaffected by the interference) at a critical time and eventually reaches steady state. Most experimental AGNES results are interpreted with a thermodynamic model, while others require kinetic considerations. We identify safe conditions for AGNES measurements and show that free Zn can be determined with the simplest implementation provided that total Cu concentration is less than 45 times that of free Zn.
Bibliography:ArticleID:ELAN201000078
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SourceType-Scholarly Journals-1
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content type line 23
ISSN:1040-0397
1521-4109
1521-4109
DOI:10.1002/elan.201000078