Instrument for measurement of the organic carbon content of water
Patent 4666860 Issued on May 19, 1987. Estimated Expiration Date: 
August 2, 2004. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
August 2, 2004. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3287088 3535087 3738812 3854877 Apparatus for measuring content of organic carbon Programmable action sampler system Measurement and monitoring of the electrical conductivity of liquor samples Electrophotolysis oxidation system for measurement of organic concentration in water Base line correction method and apparatus Gas analyzing techniques Patent #: 4418566 InventorsAssigneeApplicationNo. 06/635551 filed on 08/02/1984US Classes:436/146, In an aqueous solution (e.g., TOC, etc.)422/78, Including means for pyrolysis, combustion, or oxidation436/905PHOTOCHEMICAL ACTIVATION OF REACTIONSExaminersPrimary: Richman, Barry S.Assistant: Gzybowski, Michael S. Attorney, Agent or FirmInternational ClassesG01N 27/06 (20060101)G01N 33/18 (20060101) AbstractApparatus and methods for measurement of total organic carbon content of water, particularly of low relative organic content, are described which feature a single sample cell for exposure of a static sample to ultraviolet radiation 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.Other References
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