Emerson Solu Comp Xmt-P-FF/FI Manuale delle Istruzioni Scaricare il pdf (Pagina 140)

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The essential element of the glass electrode is a pH-sen-

sitive glass membrane. An electrical potential develops at

glass-liquid interfaces. The potential at the outside surface

depends on the pH of the test solution. The potential at

the inside surface is fixed by the constant pH of the filling

solution. Overall, the measuring electrode potential

depends solely on the pH of the test solution.

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For the glass electrode to work, the glass must be hydrat-

ed. An ion exchange mechanism involving alkalai metals

and hydrogen ions in the hydrated layer is responsible for

the pH response of the glass.

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Emerson Solu Comp Xmt-P-FF/FI Manuale delle Istruzioni Pagina 140

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