Describe the 3 types of membranes commonly used to separate the test solution from the internal...

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Chemistry

Describe the 3 types of membranes commonly used to separate thetest solution from the internal reference electrode.

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Different membrane materials have proved to give optimal responses for certain species For example a glass membrane is unsurpassed for measuring H activity pH This ISE may be referred to as a glass or pH electrode Liquid membrane electrodes have nonglass solidstate crystals or pellets as the membrane component of the electrode This approach has proved effective for numerous cations and anions The most successful example is the excellent electrode for fluoride ion which is based on a crystal of LaF3 doped with EuII to create crystal defects to improve conductivity Gassensing electrodes or combination electrodes that respond to the concentration of gases dissolved in aqueous solution The electrodes consist of an ionselective electrode usually pH in contact with a thin layer of solution that is held in place with a membrane permeable to the desired gas such as NH3 or CO2 When the gas passes through the membrane the change of pH in the thin layer of solution is sensed by the glass membrane pH electrode Other combination electrodes consist of an enzyme immobilized on an ISE The ISE is chosen to respond to a product of the enzymesubstrate reaction and the selectivity is provided by the enzyme You can read the text below for more information about the membranes and electrodes Source NMSU a The Silver Silver Chloride Single Junction Reference Electrode The most common and simplest reference system is the silver silver chloride single junction reference electrode This generally consists of a cylindrical glass tube containing a 4 Molar solution of KCl saturated with AgCl The lower end See Answer

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