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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Chromium

Citations 2

"Flow Injection Analysis Of Fluoride In Electroplating Baths With Potentiometric Detection"
Fresenius J. Anal. Chem. 1998 Volume 362, Issue 2 Pages 230-233
R. Pérez-Olmos, M. B. Etxebarria, J. L. F. C. Lima, M. C. B. S. M. Montenegro

Abstract: A high dispersion FIA system with a fluoride-selective and a double junction reference electrode in cascade arrangement was developed for the determination of F- in chromium electroplating baths. The analyzes of seven synthetic baths prepared in the laboratory and two samples provided by the industry gave results with a mean recovery value of 100.5% and a mean variation coefficient of 1.6%. These data are better than those obtained by the EDTA complexometric titration, the reference technique, with a mean recovery of 94.0% and a mean variation coefficient of 7.5%. The sampling rate for the FIA manifold was 20 samples per h.
Fluoride Electrode Potentiometry Dilution Dispersion Method comparison

"Flow Injection Determination Of Chromium(VI) In Chromium-plating Electrolytes"
Zavod. Lab. 1994 Volume 60, Issue 8 Pages 10-11
Gur'ev, I.A.;Kalugin, A.A.;Zyuzina, L.F.;Lazareva, O.P.

Abstract: Sample (135 µL) was diluted 100 fold. A 0.1 M solution of Mohr's salt was titrated with a 0.1 M solution of K2Cr2O7 at 97% (lower solution), the sample solution and a standard solution with a concentration of 10 M (upper solution) were introduced consecutively into the flow injection system. The system consisted of a peristaltic pump, plastic pipes 1 mm in diameter, a potentiometric cell containing Pt and AgCl electrodes, a pH meter, a millivoltmeter and a potentiometer. The flow rate was 0.8 ml/min. The reaction coil was 33 cm long. The interfering effect of Fe(III) ions was eliminated by the addition of 85% H3PO4 in a ratio of 3:1. The content of Cr(VI) was calculated by a formula from the height of the peaks. The method was used to analyze the electrolyte solution from a chromium-plating bath. The results agreed with data produced by titrimetry. It was possible to determine Cr(VI) at concentrations of 0.1-100 M. The RSD (n = 5) was 0.07.
Chromium(VI) Potentiometry Method comparison Interferences