Chemistry: electrical and wave energy – Processes and products – Processes of treating materials by wave energy
Patent
1988-06-20
1990-10-30
Niebling, John F.
Chemistry: electrical and wave energy
Processes and products
Processes of treating materials by wave energy
204415, 204418, 20415315, G01N 2746
Patent
active
049666711
ABSTRACT:
A potentiometric electrochemical analysis method, which comprises placing by capillary action an aqueous sample liquid to be tested for the presence of a quantity of an analyte in the sample liquid, in each of two compartments of an electrochemical analysis cell, wherein the aqueous sample liquid so placed in each compartment is in electrochemical contact with one of two electrodes forming part of the cell, wherein the electrodes are insensitive to the analyte, and wherein the compartments are separated by an electroactive barrier which is sensitive to or selective for the analyte, the barrier not being in electrical contact with either electrode except through the medium of the sample liquid, the method further comprising changing the amount of the analyte material in a selected one of the compartments by adding thereto a predefined standard quantity of analyte, measuring the resulting cell potential and determining the concentration of the analyte in the sample liquid, the predefined standard quantity of analyte being allowed to dissolve in the sample liquid from a dry material predosed in one of the compartments, the dry material being free from any electroactive material to which the electrode are sensitive.
REFERENCES:
patent: 3480520 (1969-11-01), Smith
patent: 3865708 (1975-02-01), Light
patent: 4454007 (1984-06-01), Pace
patent: 4668346 (1987-05-01), Entwistle
Durst, "Ion Selective Electrodes", National Bureau of Standards Special Publication 314, (1969), pp. 359-373.
Burns Ian W.
Nylander Claes I.
Hsing Ben C.
Niebling John F.
Unilever Patent Holdings
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