Chemistry: analytical and immunological testing – Carbon containing – In an aqueous solution
Patent
1986-12-05
1989-09-19
Richman, Barry S.
Chemistry: analytical and immunological testing
Carbon containing
In an aqueous solution
436152, 42218604, 42218605, 4221863, G01N 3300, B01J 1908
Patent
active
048681270
ABSTRACT:
Apparatus and methods for measurement of total organic carbon content of water, particularly of low relative organic content, are described, featuring a single sample cell for exposure of a static sample to ultraviolet radiation and comprising electrodes for measuring the conductivity of the water. The conductivity is monitored as a function of time and the second time derivative of the conductivity signal is monitored to indicate when the oxidation reaction has been completed. Compensation for the contribution to conductivity of the water sample made by the instrument is achieved by subtracting a quantity proportional to the first time derivative of the conductivity at a time when the second time derivative reaches zero, indicating that the oxidation reaction is complete, from the change in the total conductivity measurement, the remainder being equal to the contribution to conductivity made by oxidation of the organic content of the water. The electrodes may have surfaces of a material which when irradiated by the ultraviolet radiation catalyzes the oxidation reaction. Electrophoresis may also be employed to speed the reaction.
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Blades Frederick K.
Godec Richard D.
Anatel Corporation
Richman Barry S.
Wallen T. J.
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