lecture17 - 1-115-5 Glass Electrodes1-21-3The two silver...

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Unformatted text preview: 1-115-5 Glass Electrodes1-21-3The two silver electrodesmeasure the voltage across the glass membrane1-4Because [Cl] is fixed in each compartment and because [H+] is fixed on the inside of the glass membrane, the only variable is the pHof analytesolution outside the glass membrane. The voltage of the ideal pHelectrodechanges by 59.16 mV for every pH-unit change of analyteactivity at 25C.1-5Commercial pH glass electrode1-6Glass structureSiO4 irregular tetrahedra1-7Glass membrane1-815-6 Ion Selective Electrodes1-91-10Analytesin Table 15-4are part of the critical care profile of blood chemistry. Every analytein the table can be measured by electrochemical means. Ion-selective electrodesare the method of choice for Na+, K+, Cl, pH, and PCO2. The Chem 7 test constitutes up to 70% of tests performed in the hospital lab. It measures Na+, K+, Cl, total CO2, glucose, urea, and creatinine, four of which are analyzed with ion-selective electrodes.1-11An electrodeintended to measure ion A also responds...
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This note was uploaded on 07/23/2010 for the course CHM 3120 taught by Professor Harrison during the Fall '08 term at University of Florida.

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lecture17 - 1-115-5 Glass Electrodes1-21-3The two silver...

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