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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Wladyslaw W. Kubiak

Abbrev:
Kubiak, W.W.
Other Names:
Address:
Faculty of Material Science and Ceramics, Academy of Mining and Metallurgy, al. Mickiewicza 30, PL-30-059 Krakow, Poland
Phone:
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Fax:
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Citations 5

"Flow Injection Analysis With Detection At Mercury Drop Electrode In The Presence Of Surfactants"
Talanta 1994 Volume 41, Issue 8 Pages 1319-1325
Wladyslaw W. Kubiak* and Zyqmunt Kowalski,

Abstract: Carrier solutions of 0.5 M KNO3 of pH 4.5 at 0.71 ml/min were injected with 20-200 mL 0-9 mM Cd(II) in the same electrolyte, and the metal detected by pulse amperometry vs. SCE and a coiled Mo wire auxiliary electrode using a hanging Hg drop initially polarized at -0.5 V and with an applied -300 mV potential pulse. Parallel experiments were performed with sample and carrier solutions containing 10 g/l fumed SiO2 of particle size 0.3-1.17 mm, in the presence of 0-200 ppm Triton X-100. Optimum conditions were obtained with SiO2 present in both sample and carrier solution. Calibration graphs were linear up to 90 mM Cd(II), with a detection limit of 2.2 mM Cd(II). Applications to the anodic-stripping voltammetry of 1 mM Cd(II) and Pb(II), and the adsorptive-stripping voltammetry of 5 mM riboflavin are given as examples.
Cadmium(2+) Lead(2+) Amperometry Voltammetry Electrode Surfactant Triton X Optimization

"Separation Of The Depolarizer From Surface-active Substances In The Tubes Of A Flow Injection System"
Electroanalysis 1997 Volume 9, Issue 10 Pages 781-787
Wladyslaw W. Kubiak*, Miroslaw M. Strozik

Abstract: The possibility to separate depolarizer and surfactant bands directly in a flow injection system is reported. Transport of a surfactant is according to an adsorptive or a hydrodynamic mechanism. In the former case a surfactant is transported slower than a depolarizer whereas in the latter case it is transported faster than a depolarizer. Theoretical background for both mechanisms is provided. The influence of sample volume, mixing coil parameters (tube length and inner diameter), tube material and flow rate on the separation process is discussed. The separation process dependence on the flow rate may provide the basis of surface active substances characterization. Such characteristics for several surfactants are presented. Under optimized conditions the parameters of the calibration plots for a depolarizer in the absence and presence of surfactant are statistically equivalent. 18 References
Surfactants Cadmium Amperometry Optimization Theory

"Use Of Mercury Drop Electrodes For Polarographic Measurements In Flowing Solutions"
Electroanalysis 1989 Volume 1, Issue 5 Pages 379-388
Wladyslaw W. Kubiak

Abstract: The use of dropping mercury, hanging mercury drop, and static mercury drop electrodes in flow analysis and liquid chromatography is reviewed. Theoretical considerations (particularly flow rate dependence), measuring techniques, designs of flow-through detectors, and methods of oxygen removal in flow systems are discussed. A brief guide to flow applications of mercury electrodes is also given.

"Use Of Fumed Silica To Remove Surfactant Interferences In Continuous-flow Polarographic Measurements"
Anal. Chem. 1989 Volume 61, Issue 14 Pages 1598-1600
Wladyslaw W. Kubiak and Zygmunt Kowalski

Abstract: The flow system used comprised a solution reservoir, a pump and a flow detector with dropping-mercury electrode, Ag - AgCl reference electrode and stainless-steel auxiliary electrode. Additions of Triton X-100 and fumed silica were made to the reservoir containing sample solution and measurements were made in chronoamperometric, polarographic and amperometric modes. The effect of drop time and flow velocity on the current was studied. Addition of fumed silica to solution containing a surfactant removed interference, although more silica was needed for flow systems than for static systems.
Amperometry Polarography Electrode Surfactant Triton X Interferences

"Flow Injection Analysis As A Tool For Studying Polymer Modified Electrodes"
Anal. Chim. Acta 1996 Volume 329, Issue 1 Pages 181-189
Wladyslaw W. Kubiak*, and Joseph Wang

Abstract: A FIA system was described for studying the permeation, selectivity and dynamic properties of polymer films deposited on a glassy C disc electrode. The FIA system was equipped with a 500 µL injection loop and a thin-layer amperometric detector fitted with two glassy C electrodes (3 mm diameter), a Ag/AgCl (3 M NaCl) reference electrode and a steel auxiliary electrode. One of the glassy C electrodes was coated a polymer film, e.g., cellulose acetate, Nafion, polypyrrole, polyaniline or polyvinylpyridine. Several different test substances were injected into a 0.1 M phosphate buffer carrier stream of pH 7.4 and the responses obtained from the coated and uncoated working electrodes were compared. The advantages of the flow injection manifold are discussed; equations are derived to support the discussion.
Amperometry Electrode Electrode Electrode Electrode Electrode Electrode Detector