Abstract
Various methods for improving the lower detection limit of polymeric membrane ion-selective electrodes have been approached recently. The ion-selective electrode with solid-state membrane is described. Tetraphenyl borate as a lipophilic anion, is incorporated into the membrane of the electrode to improve its detection limit and selectivity. The detection limit was significantly lowered where nanomolar quantities were traced. Other favorable characteristics of the electrode are noticeably short response time of 5 seconds and good selectivity over the common interfering chemical species as well as its proven usefulness for determination of the surfactant in miscellaneous samples.
Highlights
IntroductionIon-selective electrodes (ISEs) are typical examples of chemical sensors that use the principle of molecular recognition [1]
Ion-selective electrodes (ISEs) are typical examples of chemical sensors that use the principle of molecular recognition [1].Solid-contact potentiometric ion-selective electrode (SC-ISE), a new generation of ISE, is a promising substitute for conventional liquid-contact ISE, drawing tremendous attention from both the experimental and theoretical scientific communities [2]
These membranes are easy to construct and are better suited for multi-ion sensors because they can be miniaturized and are not restricted to one side of the electrode. These are gaining popularity in various medical, biotechnological, pharmaceutical, and environmental fields. This type of electrode allows for low detection limit which was attributed to the absence of trans membrane ion fluxes [2,3]
Summary
Ion-selective electrodes (ISEs) are typical examples of chemical sensors that use the principle of molecular recognition [1]. SC-ISE use a polymer-coated membrane that has direct contact with the metal substrate, which can be prepared by dipping the metal wire into a PVC cocktail membrane solution to form a bead These membranes are easy to construct and are better suited for multi-ion sensors because they can be miniaturized and are not restricted to one side of the electrode. The required amount of the stock (40% solution) was transferred to a 50.0 mL volumetric flask and diluted to the mark with distilled water to make 0.01 M solutions of HY Different volumes of these solutions equivalent to 1.5×10-8 to 1.0×10-2 M were taken and analysed by the above methods using the present electrode. In the calibration graph method, different amounts of HY were added to 50.0 mL of water comprising a concentration range from 1.5×10-8 to 1.0×10-2 M and the measured potential was recorded using the present electrode. Data were plotted as potential versus logarithm of the HY activity and the resulting graph was used for subsequent determination of the concentration of surfactant samples [19]
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