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Ion selective electrode Ion selective electrode ion-selective electrode Ion selective electrode is a kind of membrane potential measured using the ion activity or concentration of electrochemical sensors, Apple M6091 Battery when tested it with contact solution ions in the sensitive film and its interface to generate the solution with the ion activity directly related to the membrane potential. With this type of electrode selectivity, a short characteristics of a balanced world, is the potential of analysis most frequently used indicator electrode. Laptop Battery Laptop Battery Laptop Battery Laptop Battery Ion selective electrode is different from the classical electrode, the former membrane potential electrode membrane surface by the balance of ion exchange, while the latter is the electrode potential redox potential 1. Ion selective electrode can be divided into the following types: (see photo) Ion selective electrode is a half-cell (sensing electrode) Acer Laptop Battery to be and appropriate composition of a complete reference electrode electrochemical cell. Under normal circumstances, internal and external reference electrode potential and liquid junction potential remains unchanged, the battery electromotive force change fully reflected in the ion-selective electrode membrane potential changes, it can be directly used for potential measurement solution in a the instructions of a specific ion activity electrode. Characterization of basic properties of ion selective electrode selective parameters, measurement of dynamic range, response speed, accuracy, stability and longevity. Sensitive ion selective electrode membrane is a selective membrane penetration of different ions through a relatively selective. Selective electrode, said with a selection coefficient Kij, Kij smaller the better, generally require less of their value in the 10-3. Measurement dynamic range as widely as possible, most of the electrode response range Acer BTP-43D1 ACER Laptop Battery DELL Laptop Battery HP Laptop Battery TOSHIBA Laptop Battery Battery for individual electrodes over 10-7mol / L. Response time refers to the electrode contacts from the beginning to the solution to stabilize the potential value (± 1mV) of the time, solid-state electrode response time of a few milliseconds, membrane electrode is usually from a few seconds to minutes. Theoretical calculations show that for a price of ions, 1mV measurement error are ± 4% relative error of concentration, ionic valence increases, the error is also multiplied. Stability, including drift and repeatability, good performance electrode in 10-3mol / L solution, the potential drift of less than 24 hours 2mV. Repeatability is defined as 25 ± 2 ? when the electrode by the 10-3mol / L solution, go to the 10-2mol / L solution,Acer TravelMate 220 Battery transferred back and forth three times the average deviation of measured potential. Ion selective electrode life is to maintain its Nernst electrode function of time, usually between several days to several years. Ion selective electrode Ion simple equipment, easy on-site analysis of automatic and continuous monitoring and field. Colored solution and turbidity can be used for the solution, generally without chemical separation, simple and fast. Can identify the presence of different ions form. In anion analysis has obvious advantages. Has been widely used in various industrial analysis, clinical testing, pharmaceutical analysis, environmental monitoring and other fields is to study thermodynamics, kinetics, coordination chemistry tools.
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