Nitrate ion selective electrode

Details Nitrate ion selective electrode Nitrate ion selective electrode

1976-11-19

1977-11-22

Kaplan, G. L.

Chemistry: electrical and wave energy

Processes and products

Vacuum arc discharge coating

204 1T, G01N 2730, G01N 2746

Patent

active

040594998

ABSTRACT:
The present invention relates to an electrode for measuring the nitrate concentration in aqueous solutions. The electrode consists of a container with an internal reference system and a membrane which is a combination of an organic nitrate sensor phase of a quaternary ammonium salt as electroactive material, an organophilic, hydrophobic solvent for the quaternary ammonium salt with substantial viscosity and polyvinyl chloride or polyurethane as non-porous material. The quaternary ammonium salt is chosen from the group consisting of: tetraoctyl ammonium nitrate, tetranonyl ammonium nitrate, tetradecyl ammonium nitrate, tetraundecyl ammonium nitrate, tetradodecyl ammonium nitrate, tetratridecyl ammonium nitrate and tetratetradecyl ammonium nitrate; and the solvent consists of dialkylphthalate or a dialkyladipate of a solubility parameter of 9 .+-. 2 (cal/cm.sup.3).sup.1/2.

REFERENCES:
patent: 3483112 (1969-12-01), Ross
patent: 3671413 (1972-06-01), Wise

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