What is selectivity coefficient in ion-selective electrode?
The selectivity coefficient is a numerical measure of how well the membrane can discriminate against the interfering ion. To put this in perspective, if an electrode has equivalent responses to the two ions, then kij = 1.0.
What are ion-selective electrodes used for?
Ion-selective electrodes (ISEs) are very similar in use to pH electrodes. They are used for chloride, potassium, calcium, carbon dioxide/carbonate, oxygen, and a variety of other ions. These methods are particularly suited for field analysis and online measurements.
How does a sodium ion-selective electrode work?
The Sodium Ion-Selective Electrode has a solid-state PVC polymer matrix membrane. The electrode is designed for the detection of sodium ions (Na+ ) in aqueous solutions and is suitable for use in both field and laboratory applications. The Sodium Ion is a monovalent cation.
How does a fluoride ion-selective electrode work?
The ion-selective electrode (ISE) typically consists of an inner reference electrode plus a membrane that provides the interface between the sample solution and the ISE. A potential develops across the membrane that depends on the difference in the activity of a specific ion on each side of the membrane.
What is an ion-selective electrode give examples?
Ion selective electrodes or ISE’s are commonly used in environmental, food and agriculture, power plants, research and in clinical applications. Examples include: Fluoride in drinking water, Calcium in beer, Nitrates in plants, Chloride in canned food products, and Calcium in dental studies.
What is direct ion-selective electrode?
Direct and indirect ion selective electrodes (ISEs) are two methods commonly used in biochemistry laboratories in order to measure the electrolytes such as sodium.
Is ion-selective electrode a type of primary reference electrode?
ELECTRODES | Ion-Selective Electrodes An ion-selective electrode (ISE) is an example of an electrochemical sensor utilizing the principle of potentiometry, or measurement of the cell potential (i.e., ISE against a standard reference electrode) at near-zero current.
How electrodes are made selective?
Glass membrane electrodes are formed from special ionically conducting glass. By altering the composition and constituents of the glass, changes can be made to selectivity, chemical resistance, response time, and impedance. The most common glass membrane ion selective electrode is the pH electrode.
Which electrode is ion-selective electrode?
An ion-selective electrode (ISE), also known as a specific ion electrode (SIE), is a transducer (or sensor) that converts the activity of a specific ion dissolved in a solution into an electrical potential. The voltage is theoretically dependent on the logarithm of the ionic activity, according to the Nernst equation.