University of North Florida
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Stuart Chalk, Ph.D.
Department of Chemistry
University of North Florida
Phone: 1-904-620-1938
Fax: 1-904-620-3535
Email: schalk@unf.edu
Website: @unf

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Electrode

Classification: Electrode -> mercury -> gold coated

Citations 1

"Flow Injection Analysis With Tensammetric Detection For The Determination Of Detergents"
Anal. Chim. Acta 1984 Volume 156, Issue 1 Pages 71-76

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M. Bos, J. H. H. G. van Willigen and W. E. van der Linden

Abstract: The sample (60 µL of, e.g., aqueous production-control solution or sewage) is injected into a carrier stream (5 mM in a surfactant), which is subsequently mixed with 0.1 M Na2SO4 and passed into a detector cell equipped with a mercury-coated gold electrode, an uncoated gold counter-electrode and a silver - AgCl reference electrode. The change in capacitance of the electrical double layer of the working electrode is measured at -0.85 V (except for benzalkonium chloride, for which the applied potential is -0.40 V). Calibration graphs are non-linear and are best approximated by use of polynomial or cubic spline functions. The method is applicable to both ionic and non-ionic surfactants in the range 10 to 100 µM, with relative errors of ~±4%. Sixty samples can be analyzed in 1 h.
Benzalkonium chloride Surfactants Industrial Waste