Instrument for measurement of the organic carbon content of water
January 10, 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 3738812 Apparatus for measuring content of organic carbon Programmable action sampler system Measurement and monitoring of the electrical conductivity of liquor samples Ultraviolet radiation sensor Electrophotolysis oxidation system for measurement of organic concentration in water Water sterilizer and organic matter measurement instrument Base line correction method and apparatus Gas analyzing techniques Patent #: 4418566 InventorsAssigneeApplicationNo. 06/569678 filed on 01/10/1984US Classes:422/78, Including means for pyrolysis, combustion, or oxidation422/82.02Resistance or conductivityExaminersPrimary: Richman, Barry S.Assistant: Gzybowski, Michael S. Attorney, Agent or FirmInternational ClassesG01N 27/06 (20060101)G01N 33/18 (20060101) AbstractApparatus and methods for measurements of total organic carbon content of water, particularly of low relative organic content, is described which features a single sample cell for exposure of a sample to ultraviolet radiation comprising electrodes for measuring the resistivity 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 porportional to the first time derivative of the resistivity at a time when the second time derivative reaches zero, indicating that the oxidation reaction is complete, from the overall conductivity measurement, the remainder being equal to the contribution of conductivity made by the organic content to the water.Other References
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