Reference electrode

Details Reference electrode Reference electrode

1992-07-10

1994-08-02

Tung, T.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204416, G01N 2730

Patent

active

053343050

ABSTRACT:
An internal liquid for a reference electrode containing lithium chloride (LiCl) and ammonium nitrate (NH.sub.4 NO.sub.3) in a dissolved state at a ratio [NH.sub.4 NO.sub.3 ]/[LiCl].gtoreq. 4. Internal liquid also contains AgCl to saturation for use with an Ag--AgCl internal electrode, and is in a gellated state or impregnated in a highly water-absorbent synthetic resin. It is used in conjunction with a comparison electrode or an internal reference electrode for an ion-selective electrode.
Drying up of the internal liquid in the gellated state is minimized so that the function of the internal liquid as a liquid bridge may be displayed for a prolonged period of time. If the ionic concentration of the liquid under examination is changed, liquid potential difference remains substantially unchanged to provide a stable reference electrical potential.

REFERENCES:
patent: 3103480 (1963-09-01), Watanabe et al.
patent: 3455793 (1969-07-01), Watanabe et al.
patent: 3833495 (1974-09-01), Grubb
patent: 4390406 (1983-06-01), Kato et al.
patent: 5066383 (1991-11-01), Yamaguchi et al.
Orion Research Inc. Newsletter/Specific Electrode Technology, vol. 1, No. 4, Sep. 1969, pp. 21-23.
Burrows et al. J. Electrochem. Soc.: Electrochemical Science, Apr. 1968, pp. 365-367.

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