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The Impact of Intermetallic Compounds Cu x Zn in the Determination of Free Zn 2+ Concentration with AGNES
Author(s) -
Chito Diana,
Galceran Josep,
Companys Encarnació
Publication year - 2010
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201000078
Subject(s) - intermetallic , materials science , chemistry , nuclear chemistry , metallurgy , analytical chemistry (journal) , environmental chemistry , alloy
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.