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
Website: @unf

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Classification: Industrial -> electroplating solution -> silver

Citations 2

"Closed-loop Recirculating Manifold For Matrix Isolation In Flow Injection - Flame Atomic Absorption Spectrometry. Analysis Of Silver Electrolysis Solutions"
Talanta 1992 Volume 39, Issue 11 Pages 1525-1530
Ebenezer Debrah and Julian F. Tyson*Michael W. Hinds,

Abstract: Two flow injection procedures were investigated for the determination of trace amounts of Cu, Fe, Ni and Zn in Ag electrolysis solution by matrix removal of the Ag by precipitation and retention on an online filter. A single-line manifold gave acceptable results for limited periods, but for prolonged operation it was necessary to remove the Ag. This was achieved with a closed-loop recirculating manifold (described) in which Ag was precipitated as AgCl and retained on a filter of nylon fibers. After injection of the sample for AAS analysis, the filter was rapidly regenerated by flushing with NH3 solution Good recoveries (>95%) were obtained for Cu, Fe, Ni and Zn from solution containing 100 g L-1 of Ag, with >95% of the Ag being retained on the filter. Calibration graphs were rectilinear from 0 to 30 mg L-1 for all four metals and the coefficient of variation (n = 4) was 4%, except for Ni (9.8%). The effect of various operating parameters and optimization of experimental conditions were investigated. Two flow injection procedures were studied for the determination of some elements in Ag electrolysis solutions, for which the problem of the formation of Ag acetylide needs to be addressed. A single line manifold was found to give acceptable results for limited time periods, but for prolonged operation it was necessary to remove the Ag. This was achieved with a recirculating reactor in which the Ag was pptd. as the chloride and retained on a filter of nylon fibers. Good recoveries of Cu, Fe, Ni, and Zn from solutions containing up to 100 g/L. Ag were obtained with over 95% of the Ag retained on the filter. The filter was regenerated rapidly by flushing with NH3 solution
Copper Iron Nickel Zinc Spectrophotometry Closed loop Matrix removal Precipitation Filter Optimization

"Ionometric Determination Of Thiocyanate By The Method Of Additions In Continuous-flow Analysis"
J. Anal. Chem. 1992 Volume 47, Issue 4 Pages 608-612
Evsevleeva, L.G.;Urusov, Y.I.;Petrukhin, O.M.;Borzitsky, Y.A.

Abstract: Continuous-flow analysis measurements were made with a SCN--selective electrode composed of a membrane prepared from PVC powder (0.1 g), dibutyl phthalate (0.3 ml), tetradecylammonium thiocyanate (40 mg) and THF (6 ml). The electrode was calibrated against a standard KSCN solution. The parallel addition method was used; a single measurement took ~8 s. A method has been developed for the determination of SCN- ions by standard addition in continuous-flow. The anal. output is 420 measurements per h. The reproducibility is 0.3 mV. The method was applied to the determination of SCN- in model sample and Ag-plating solution
Thiocyanate ion Electrode Standard additions calibration