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.

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References in periodicals archive

The conventional methods using glass electrodes for pH measurements are bigger in size, highly sensitive to temperature changes and are less sensitive compared to the technique of using ISFET [25].

Development of smart device for detection of microbial biofilm formation

Flat glass pH sensors must be mounted at least 5[degrees] above horizontal so the liquid in the glass electrode is always in contact with the glass interior.

Using pH & conductivity measurement for stock prep and wet end control: as paper mills have begun closing their water systems, the need for conductivity monitoring has increased. Careful sensor selection and placement are critical to accurate control

By the fall of 1937, Beckman and his team at NTL had greatly improved their own manufactured glass electrodes. Sales and profits of the meter soared despite the Great Depression of the 1930s.

Arnold O. Beckman: One Hundred Years of Excellence

Due to the presence of perchlorate ions in the system, the internal solution of the combined glass electrode (KCl) was substituted by NaCl = 3.00 mol [L.sup.-1] solution, in order to prevent KCl[O.sub.4] precipitation in the electrode membrane.

Potentiometric Study of Azide Complexes of Iron(III) in Water/THF Medium

Aqueous solution of sodium 3,4(methylenedioxy)cinnamate 0.10 mol [L.sup.-1] was prepared from 3,4-(methylenedioxy)cinnamic acid suspension by treatment with sodium hydroxide 0.10 mol [L.sup.-1], whose pH was adjusted around 7.5 using a pH-meter with a combined glass electrode. Aqueous solution of the bivalent metal ion was prepared by dissolving the respective chloride.

Synthesis and preliminary characterization of manganese 3,4-(methylenedioxi)cinnamate compound: a simple approach to improve electroanalytical application after incorporation to the carbon paste electrode

For manual determination the Metrohm 691 meter with a combined glass electrode assembly, Dosimat dispensing unit and titration stand are used, whilst for automated analyses the Titro processor or Titrino ranges of titrators are recommended by Metrohm UK Ltd of Unit 2, Topangel, Buckingham Industrial Park, Buckingham, tel: 0128 082 4824.

Metrohm's Potentiometric and Photometric Analysis