Ion-selective electrode

Chemistry: electrical and wave energy – Apparatus – Electrolytic

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204416, 204435, G01N 2726

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active

054178363

ABSTRACT:
An ion-selective electrode comprises, in order of enumerating from the measured-ion contact side: a solid electrolyte as an ion-sensitive membrane; an ionic bridge layer; and, an internal electrode. The bridge layer is prepared by mixing a salt mixture with an electrically conductive resin composition at a ratio of 1:2 to 3:1 in weight, determined after heat treatment. The salt mixture is prepared by mixing silver halide with sodium phosphate at a ratio of from 9:1 to 3:7 in weight. The electrode is very small in voltage fluctuation detected among products; easily downsized to be capable of measuring a very small amount of a sample solution; and useful in measuring activity of ion species such as Na-ion.

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Fabry et al., "Internal Ionic Bride for Ion Solid State Sensors", Proc. of the 2nd Int. Meeting on Chemical Sensors, Bordeaux 1986, 5-02, pp. 473-476. no month available.
Fabry et al., "Nasicon, An Ionic Conductor for Solid-State, Na.sup.+ -Selective Electrode", Sensors and Actuators, 15 (1988) 33-49. no month available.
H. Y-P. Hong, "Crystal Structures and Crystal Chemistry in the System Na.sub.1+x Zr.sub.2 Si.sub.x P.sub.3-x O.sub.12 ", Mat. Res. Bull. vol. 11, Pergamon Press, Inc. 1976, pp. 173-182. no month availiable.

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