Spectroscopic in Situ Imaging of Acid Coextraction Processes in Solvent Polymeric Ion-Selective Electrode and Optode Membranes

Lindner, Ernő; Zwickl, Titus; Bakker, Eric; Lan, Bui Thi Thu; Tóth, Klára; Pretsch, Ernö

doi:10.1021/ac970952w

Cited by 57 publications

(42 citation statements)

References 24 publications

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“…With the help of these molecules, one could look into the bulk of solvent polymeric membranes during potentiometric [63,64], chronoamperometric or chronopotentiometric experiments and image concentration profiles in situ with high spatial and temporal resolution (spectro-electrochemical microscopy) [65]. The combination of electrochemical and optical information helped to interpret non-idealities in the potentiometric responses, suppress or tailor the undesirable transport across sensor membranes, and estimate the residual lifetime of chronically implanted sensors.…”

Section: New Approach For Monitoring Concentration Profiles Ion Ion-smentioning

confidence: 99%

“…Under such conditions the primary ion leakage from the membrane due to ion-exchange or coextraction processes [63] can significantly increase the solution concentration in the boundary solution layer while the membrane concentrations remain virtually unchanged. The increase in the vicinity of a lead selective membrane was verified experimentally at the first time by SECM [78].…”

Section: Perspectivesmentioning

confidence: 99%

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To the Memory of Ernő Pungor: A Subjective View on the History of Ion‐Selective Electrodes

Lindner

Tóth

2009

Electroanalysis

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In the Mátrafüred 08 Symposium on Electrochemical Sensors a session was dedicated to the memory of late Professor Ernő Pungor, the founder and long-term organizer of the Má trafüred conference series. We all remember him as an inventive scientist with an enthusiastic and witty personality, rich in ideas. Ernő Pungor left his mark in science and on many scientists worldwide. With this contribution, the authors would like to pay tribute to him and acknowledge his outstanding contributions to analytical chemistry, but especially his pioneering works in the field of ion-selective electrodes.

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Section: New Approach For Monitoring Concentration Profiles Ion Ion-smentioning

confidence: 99%

Section: Perspectivesmentioning

confidence: 99%

To the Memory of Ernő Pungor: A Subjective View on the History of Ion‐Selective Electrodes

Lindner

Tóth

2009

Electroanalysis

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“…Not only thermodynamic parameters but also time-dependent processes in the bulk and at the phase boundaries of solvent polymeric ISE membranes have been studied thoroughly [33][34][35]. The diffusion coefficients of relevant components have been determined as a function of the membrane composition [36][37][38].…”

Section: Fundamental Understandingmentioning

confidence: 99%

The new wave of ion-selective electrodes

Pretsch

2007

TrAC Trends in Analytical Chemistry

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141

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During the last decade, the capabilities of potentiometric analysis have changed fundamentally in that the lower limit of detection (LOD) of ion-selective electrodes (ISEs) has improved by a factor of up to one million and the discrimination factor of interferences from ions by up to one billion. These spectacular improvements are related to the control of ion fluxes through the ion-selective membrane. Nowadays, ISEs can be used for trace measurements in environmental samples. However, by reducing the volume of the samples, the LOD in terms of the amount of analytes has been reduced to the attomole range. This is promising for bioanalysis using metal nanoparticle labels. Other recent progress includes the excellent fundamental understanding of the working mechanism, the introduction of a novel kind of calibration procedure that reduces the demands on signal stability and reproducibility, and the advent of pulsed amperometric methods.

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“…Later studies on the distribution of membrane components as a result of anion coextraction (Donnan failure) (21) were based on research microscopes equipped with CCD camera. Thus, spectropotentiometry evolved as an imaging technique for the study of transport processes related to cation (22) and anion (23) interference in H 1 -selective solvent polymeric membranes containing a suitable pH-sensitive chromoionophore. The basic idea has been the use of an ISM ring sandwiched between two optical windows.…”

mentioning

confidence: 99%

“…The concentration profiles of protonated and unprotonated forms of the chromoionophore were recorded in real-time at a nominal resolution of 2.25 lm (at 10-fold magnification of the microscope), which allowed for the first time the interpretation of potential transients on the basis of membrane composition changes. In addition, spectropotentiometry has been used for imaging the chro-moionophore-mediated water transport (24) and the optical determination of the diffusion coefficients of complexed and uncomplexed chromoionophores (22,23).…”

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confidence: 99%

Multispectral imaging of ion transport in neutral carrier‐based cation‐selective membranes

Gyurcsányi¹,

Lindner²

2006

Cytometry Pt A

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Background:High‐resolution spectroscopic imaging of the cross section of ion‐selective membranes during real‐time electrochemical measurements is termed spectroelectrochemical microscopy (SpECM). SpECM is aimed for optimizing the experimental conditions in mass transport controlled ion‐selective electrode (ISE) membranes for improved detection limit.Methods:The SpECM measurements are performed in a thin layer electrochemical cell. The key element of the cell is a membrane strip spacer ring assembly which forms a two compartment electrochemical cell. The cell is placed onto the stage of a microscope and the membrane strip is positioned in the center of the field of view. A slice of the image is focused onto the entrance slit of the imaging spectrometer.Results:SpECM has been used for the determination of the diffusion coefficients of different membrane ingredients and for the quantitative assessment of the charged site concentrations in ISE membranes and membrane plasticizers. In addition, changes in the concentration profiles of the ionophore (free and complexed) and charged mobile sites inside the ISE membranes are documented upon the application of large external voltages.Conclusions:This account demonstrates the power and advantages of SpECM, a multispectral imaging method for investigations of mass transport processes in ISE membranes during electrochemical measurements. © 2006 International Society for Analytical Cytology

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Spectroscopic in Situ Imaging of Acid Coextraction Processes in Solvent Polymeric Ion-Selective Electrode and Optode Membranes

Cited by 57 publications

References 24 publications

To the Memory of Ernő Pungor: A Subjective View on the History of Ion‐Selective Electrodes

To the Memory of Ernő Pungor: A Subjective View on the History of Ion‐Selective Electrodes

The new wave of ion-selective electrodes

Multispectral imaging of ion transport in neutral carrier‐based cation‐selective membranes

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