ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIonic additives for ion-selective electrodes based on electrically charged carriersUlrich. Schaller, Eric. Bakker, Ursula E. Spichiger, and Ernoe. PretschCite this: Anal. Chem. 1994, 66, 3, 391–398Publication Date (Print):February 1, 1994Publication History Published online1 May 2002Published inissue 1 February 1994https://pubs.acs.org/doi/10.1021/ac00075a013https://doi.org/10.1021/ac00075a013research-articleACS PublicationsRequest reuse...

ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTLarge Improvement of the Lower Detection Limit Ion-Selective Polymer Membrane ElectrodesTomasz Sokalski, Alan Ceresa, Titus Zwickl, and Ernö PretschView Author Information Department Organic Chemistry Swiss Federal Institute Technology (ETH) CH-8092 Zürich, Switzerland Cite this: J. Am. Chem. Soc. 1997, 119, 46, 11347–11348Publication Date (Web):November 19, 1997Publication History Received20 August 1997Revised8 October 1997Published online19...

A thin aqueous layer is formed between the polymeric ion-selective membrane and an inner gold electrode. Its composition can be altered upon sample changes, which leads to drifting potentials. It shown by theory experiment that interfering ions enter much faster than primary ones. Measurement protocols with equal contact times for reconditioning solution therefore not eliminate effect of changes in solution. The formation film corresponding drifts solid-contacted electrodes avoided creating...

This article reviews recent advances in the field of potentiometric solvent polymeric membrane electrodes. These sensors have found widespread applications a variety fields, especially area clinical diagnostics. Emphasis is given on discussion theoretical and practical limits ionophore-based ion-selective electrodes, with special focus electrode sensitivities, characterization selectivities dramatic improvements detection limits. Advances ionophore design underlying model assumptions are...

The influence of the composition internal electrolyte solution on response Pb2+- and Ca2+-selective membrane electrodes is investigated. It shown that lower detection limit improved by generating, in membrane, ionic gradients lead to a flux primary ions toward inner reference solution. If ion too strong, it may cause analyte depletion at surface and, as consequence, apparent super-Nernstian response. Such are not adequate measure low activities but can be used determine unbiased selectivity...

Submicromolar to picomolar lower detection limits have recently been obtained with various polymer membrane ion-selective electrodes by minimizing biases due ion fluxes through the membrane. For best performance, compositions of and inner solution should be optimized for each application. Given number parameters adjusted, it has difficult find a target sample. In this paper, much simplified more practical steady-state model zero-current is derived, which based on measurable parameters. The...

The processes determining the lower detection limit of carrier-based ion-selective electrodes (ISEs) are described by a steady-state ion flux model under zero-current conditions. Ion-exchange and coextraction equilibria on both sides membrane induce concentration gradients within organic phase and, through resulting fluxes, influence limit. latter is shown to improve considerably when very small decreasing primary toward inner electrolyte solution created. By merely altering electrolyte,...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNeutral carrier based calcium(2+)-selective electrode with detection limit in the sub-nanomolar rangeUrs. Schefer, Daniel. Ammann, Ernoe. Pretsch, Urs. Oesch, and Wilhelm. SimonCite this: Anal. Chem. 1986, 58, 11, 2282–2285Publication Date (Print):August 1, 1986Publication History Published online1 May 2002Published inissue 1 August 1986https://pubs.acs.org/doi/10.1021/ac00124a036https://doi.org/10.1021/ac00124a036research-articleACS...