Andrzej Lewenstam | AGH University of Science and Technology (original) (raw)

Papers by Andrzej Lewenstam

Research paper thumbnail of The Role of Surface Processes in Signal Formation with Solid- State Ion-Selective Electrodes — Chloride Interference on Copper Ion-Selective Electrode

Springer eBooks, 1990

Although there is no doubt that surface science is a discipline on its own, in practically orient... more Although there is no doubt that surface science is a discipline on its own, in practically oriented electroanalytical chemistry it is mostly an auxiliary force to establish the mechanism of electrode signal. A recent, rapid development of electroanalytical sensors provided the evidence that to get more incisive knowledge of surface-located signal forming processes it is necessary to set a new or to improve existing analytical procedures. Therefore the inspection of surface processes by suitable methods seems to be an indispensable feature of electroanalytical chemistry of today.

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Research paper thumbnail of Diffusion-layer model for copper solid-state chalcocite membrane electrode; sensitivity to copper(II) ions

Talanta, Sep 1, 1976

The diffusion-layer model for the chalcocite (Cu(2)S) membrane electrode is discussed. It is equi... more The diffusion-layer model for the chalcocite (Cu(2)S) membrane electrode is discussed. It is equivalent to a simpler model based on exchange reactions at the electrode surface. The chalcocite is sensitive to copper(I) and copper(II) ions and the theoretically predicted response is in good agreement with experimental data. The membrane is a conductor, but this does not significantly affect its function as an ion detector. The limitation of the electrode is the membrane solubility as shown when Cu(II) ions in contrast to copper(I) ions are strongly complexed.

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Research paper thumbnail of Diffusion Transport in Electrochemical Systems: A New Approach to Determining of the Membrane Potential at Steady State

Defect and Diffusion Forum, Mar 1, 2009

Ionic concentrations and electric field space profiles in one dimensional membrane are described ... more Ionic concentrations and electric field space profiles in one dimensional membrane are described using Nernst-Planck-Poisson (NPP) equations. The usual assumptions for the steady state NPP problem requires knowledge of the boundary values of the concentrations and electrical potential difference. In analytical chemistry the potential difference may not be known and its theoretical prediction from the model is desirable. The effective methods of the solution to the NPP equations are presented. The Poisson equation is solved without widely used simplifications such as the constant field or the electroneutrality assumptions. The first method uses a steady state formulation of NPP problem. The original system of ODEs is turned into the system of non-linear algebraic equations with unknowns fluxes of the components and electrical potential difference. The second method uses the time-dependent form of the Nernst-Planck-Poisson equations. Steady-state solution has been obtained by starting from an initial profiles, and letting the numerical system evolve until a stationary solution is reached. The methods have been tested for different electrochemical systems: liquid junction and ion selective electrodes (ISEs). The results for the liquid junction case have been also verified with the approximate solutions leading to a good agreement. Comparison with the experimental results for ISEs has been carried out.

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Research paper thumbnail of Studies of quaternary ammonium ion interference on potassium ion-selective electrodes

Fresenius Journal of Analytical Chemistry, 1993

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Research paper thumbnail of Potentiometric method for the determination of calcium in blood serum

Analytica Chimica Acta, 1990

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Research paper thumbnail of Sensors and signals

Analytical Proceedings, 1991

... Michael EG Lyons, Cormac H. Lyons, Declan E. McCormack," Thomas J. McCabe an... more ... Michael EG Lyons, Cormac H. Lyons, Declan E. McCormack," Thomas J. McCabe and William Breen* Physical Chemistry Laboratory, University of Dublin, Trinity College, Dublin 2, Ireland John F. Cassidy Chemistry Department, Dublin Institute of Technology, Kevin Street ...

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Research paper thumbnail of Ion-selective electrode control based on coulometrically determined stability constants of biologically important calcium and magnesium complexes

Analytica Chimica Acta, Feb 1, 1993

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Research paper thumbnail of Electrochemical Impedance Spectroscopy (EIS) of ion sensors

Journal of Electroanalytical Chemistry, Nov 1, 2011

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Research paper thumbnail of Electrodissolution of synthetic covellite in hydrochloric acid

Journal of Applied Electrochemistry, May 1, 1982

ABSTRACT

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Research paper thumbnail of Potentiometric selectivity of p-doped polymer films

Analytica Chimica Acta, Feb 1, 2000

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Research paper thumbnail of Interpretation of selectivity coefficients of solid-state ion-selective electrodes by means of the diffusion-layer model

Talanta, 1977

On the basis of a diffusion-layer model the selectivity coefficients of solid-state electrodes ha... more On the basis of a diffusion-layer model the selectivity coefficients of solid-state electrodes have been interpreted. In the Nernst equation the concentration of the principal ion may be expressed in terms of the diffusion coefficients D(B), D(C) and the equilibrium constant K of the reaction AB + C right harpoon over left harpoon AC + B where AB represents the membrane material and C the interfering ion, in the form of an equation: [B](0)=KD (B)KD (B) + D (C)[B] + KD (C)KD (B) + D (C)[C] where the concentration with subscript "0" denotes the surface concentration directly influencing the electrode potential, and [B] and [C] are bulk concentrations of the species indicated. The differences between various literature data can be explained on the basis of this model.

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Research paper thumbnail of Fully automated potentiometric determination of ionized magnesium in blood serum

Analytica Chimica Acta, 1990

ABSTRACT Basic observations leading to the successful application of magnesium ion-selective elec... more ABSTRACT Basic observations leading to the successful application of magnesium ion-selective electrodes for the automated determination of ionized magnesium in undiluted serum are discussed. The principles of the method are described and the first numerical results are reported.

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Research paper thumbnail of Factors Affecting the Potentiometric Response of All-Solid-State Solvent Polymeric Membrane Calcium-Selective Electrode for Low-Level Measurements

Analytical Chemistry, Oct 1, 2004

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Research paper thumbnail of Elimination of ionic interferences in the determination of sulphates in water using the lead-sensitive ion-selective electrode

Analyst, 1976

ABSTRACT

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Research paper thumbnail of Conducting polymer-based ion-selective electrodes

Analytica Chimica Acta, Apr 1, 1996

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Research paper thumbnail of Electrochemical Properties of the Poly(3,4-ethylenedioxythiophene) Doped with Taurine Ligands

Electroanalysis, Nov 19, 2012

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Research paper thumbnail of Design and pitfalls of ion selective electrodes

Scandinavian Journal of Clinical & Laboratory Investigation, 1994

Design of ion-selective electrodes (ISEs) currently used in clinical analysis is presented. The t... more Design of ion-selective electrodes (ISEs) currently used in clinical analysis is presented. The theory of these sensors is outlined. Problems specific for the application of ISEs in clinical analysis are discussed.

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Research paper thumbnail of Galvanic cell without liquid junction for potentiometric determination of copper

Analytica Chimica Acta, Jul 1, 2007

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Research paper thumbnail of Direct Potentiometric Determination of Hydrogen Carbonate in Mineral Waters

Electroanalysis, Nov 2, 2016

Properties of membranes based on quaternary ammonium salts as an ion‐exchanger were investigated.... more Properties of membranes based on quaternary ammonium salts as an ion‐exchanger were investigated. The analytical performance of electrodes was studied by potentiometric measurements. All developed electrodes showed a near‐Nernstian response. However, the best analytical properties were observed for the electrode with DOS plasticizer. The influence of sample matrix components was estimated by Plackett‐Burman experimental design. The effect of five different potential interferents – concentration of anions, which usually exist in mineral water – was examined. The proposed potentiometric sensor was successfully applied for the determination of hydrogen carbonate (bicarbonate) in mineral water samples.

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Research paper thumbnail of Selectivity coefficients of ion-selective magnesium electrodes used for simultaneous determination of magnesium and calcium ions

Talanta, Dec 1, 2011

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Research paper thumbnail of The Role of Surface Processes in Signal Formation with Solid- State Ion-Selective Electrodes — Chloride Interference on Copper Ion-Selective Electrode

Springer eBooks, 1990

Although there is no doubt that surface science is a discipline on its own, in practically orient... more Although there is no doubt that surface science is a discipline on its own, in practically oriented electroanalytical chemistry it is mostly an auxiliary force to establish the mechanism of electrode signal. A recent, rapid development of electroanalytical sensors provided the evidence that to get more incisive knowledge of surface-located signal forming processes it is necessary to set a new or to improve existing analytical procedures. Therefore the inspection of surface processes by suitable methods seems to be an indispensable feature of electroanalytical chemistry of today.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Diffusion-layer model for copper solid-state chalcocite membrane electrode; sensitivity to copper(II) ions

Talanta, Sep 1, 1976

The diffusion-layer model for the chalcocite (Cu(2)S) membrane electrode is discussed. It is equi... more The diffusion-layer model for the chalcocite (Cu(2)S) membrane electrode is discussed. It is equivalent to a simpler model based on exchange reactions at the electrode surface. The chalcocite is sensitive to copper(I) and copper(II) ions and the theoretically predicted response is in good agreement with experimental data. The membrane is a conductor, but this does not significantly affect its function as an ion detector. The limitation of the electrode is the membrane solubility as shown when Cu(II) ions in contrast to copper(I) ions are strongly complexed.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Diffusion Transport in Electrochemical Systems: A New Approach to Determining of the Membrane Potential at Steady State

Defect and Diffusion Forum, Mar 1, 2009

Ionic concentrations and electric field space profiles in one dimensional membrane are described ... more Ionic concentrations and electric field space profiles in one dimensional membrane are described using Nernst-Planck-Poisson (NPP) equations. The usual assumptions for the steady state NPP problem requires knowledge of the boundary values of the concentrations and electrical potential difference. In analytical chemistry the potential difference may not be known and its theoretical prediction from the model is desirable. The effective methods of the solution to the NPP equations are presented. The Poisson equation is solved without widely used simplifications such as the constant field or the electroneutrality assumptions. The first method uses a steady state formulation of NPP problem. The original system of ODEs is turned into the system of non-linear algebraic equations with unknowns fluxes of the components and electrical potential difference. The second method uses the time-dependent form of the Nernst-Planck-Poisson equations. Steady-state solution has been obtained by starting from an initial profiles, and letting the numerical system evolve until a stationary solution is reached. The methods have been tested for different electrochemical systems: liquid junction and ion selective electrodes (ISEs). The results for the liquid junction case have been also verified with the approximate solutions leading to a good agreement. Comparison with the experimental results for ISEs has been carried out.

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Research paper thumbnail of Studies of quaternary ammonium ion interference on potassium ion-selective electrodes

Fresenius Journal of Analytical Chemistry, 1993

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Research paper thumbnail of Potentiometric method for the determination of calcium in blood serum

Analytica Chimica Acta, 1990

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Sensors and signals

Analytical Proceedings, 1991

... Michael EG Lyons, Cormac H. Lyons, Declan E. McCormack," Thomas J. McCabe an... more ... Michael EG Lyons, Cormac H. Lyons, Declan E. McCormack," Thomas J. McCabe and William Breen* Physical Chemistry Laboratory, University of Dublin, Trinity College, Dublin 2, Ireland John F. Cassidy Chemistry Department, Dublin Institute of Technology, Kevin Street ...

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Research paper thumbnail of Ion-selective electrode control based on coulometrically determined stability constants of biologically important calcium and magnesium complexes

Analytica Chimica Acta, Feb 1, 1993

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Electrochemical Impedance Spectroscopy (EIS) of ion sensors

Journal of Electroanalytical Chemistry, Nov 1, 2011

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Electrodissolution of synthetic covellite in hydrochloric acid

Journal of Applied Electrochemistry, May 1, 1982

ABSTRACT

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Potentiometric selectivity of p-doped polymer films

Analytica Chimica Acta, Feb 1, 2000

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Interpretation of selectivity coefficients of solid-state ion-selective electrodes by means of the diffusion-layer model

Talanta, 1977

On the basis of a diffusion-layer model the selectivity coefficients of solid-state electrodes ha... more On the basis of a diffusion-layer model the selectivity coefficients of solid-state electrodes have been interpreted. In the Nernst equation the concentration of the principal ion may be expressed in terms of the diffusion coefficients D(B), D(C) and the equilibrium constant K of the reaction AB + C right harpoon over left harpoon AC + B where AB represents the membrane material and C the interfering ion, in the form of an equation: [B](0)=KD (B)KD (B) + D (C)[B] + KD (C)KD (B) + D (C)[C] where the concentration with subscript "0" denotes the surface concentration directly influencing the electrode potential, and [B] and [C] are bulk concentrations of the species indicated. The differences between various literature data can be explained on the basis of this model.

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Research paper thumbnail of Fully automated potentiometric determination of ionized magnesium in blood serum

Analytica Chimica Acta, 1990

ABSTRACT Basic observations leading to the successful application of magnesium ion-selective elec... more ABSTRACT Basic observations leading to the successful application of magnesium ion-selective electrodes for the automated determination of ionized magnesium in undiluted serum are discussed. The principles of the method are described and the first numerical results are reported.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Factors Affecting the Potentiometric Response of All-Solid-State Solvent Polymeric Membrane Calcium-Selective Electrode for Low-Level Measurements

Analytical Chemistry, Oct 1, 2004

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Elimination of ionic interferences in the determination of sulphates in water using the lead-sensitive ion-selective electrode

Analyst, 1976

ABSTRACT

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Conducting polymer-based ion-selective electrodes

Analytica Chimica Acta, Apr 1, 1996

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Electrochemical Properties of the Poly(3,4-ethylenedioxythiophene) Doped with Taurine Ligands

Electroanalysis, Nov 19, 2012

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Design and pitfalls of ion selective electrodes

Scandinavian Journal of Clinical & Laboratory Investigation, 1994

Design of ion-selective electrodes (ISEs) currently used in clinical analysis is presented. The t... more Design of ion-selective electrodes (ISEs) currently used in clinical analysis is presented. The theory of these sensors is outlined. Problems specific for the application of ISEs in clinical analysis are discussed.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Galvanic cell without liquid junction for potentiometric determination of copper

Analytica Chimica Acta, Jul 1, 2007

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Direct Potentiometric Determination of Hydrogen Carbonate in Mineral Waters

Electroanalysis, Nov 2, 2016

Properties of membranes based on quaternary ammonium salts as an ion‐exchanger were investigated.... more Properties of membranes based on quaternary ammonium salts as an ion‐exchanger were investigated. The analytical performance of electrodes was studied by potentiometric measurements. All developed electrodes showed a near‐Nernstian response. However, the best analytical properties were observed for the electrode with DOS plasticizer. The influence of sample matrix components was estimated by Plackett‐Burman experimental design. The effect of five different potential interferents – concentration of anions, which usually exist in mineral water – was examined. The proposed potentiometric sensor was successfully applied for the determination of hydrogen carbonate (bicarbonate) in mineral water samples.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Selectivity coefficients of ion-selective magnesium electrodes used for simultaneous determination of magnesium and calcium ions

Talanta, Dec 1, 2011

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