glass electrode

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glass electrode

[¦glas i′lek‚trōd]
(physical chemistry)
An electrode or half cell in which potential measurements are made through a glass membrane, which acts as a cation-exchange membrane; thus, the potential arises from phase-boundary and diffusion potentials which, depending on the composition of the glass, are logarithmic functions of the activity of the cations such as H+, Na+, or K+of the solutions in which the electrode is immersed.