Instrument for measurement of the organic carbon content of wate

Details Instrument for measurement of the organic carbon content of wate Instrument for measurement of the organic carbon content of wate

1984-01-10

1986-12-02

Richman, Barry S.

Chemical apparatus and process disinfecting, deodorizing, preser

Analyzer, structured indicator, or manipulative laboratory...

Means for analyzing liquid or solid sample

422 68, G01N 2707

Patent

active

046264132

ABSTRACT:
Apparatus 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.

REFERENCES:
patent: 3738812 (1973-06-01), Berry et al.
patent: 3958941 (1976-05-01), Regan
patent: 4140018 (1979-02-01), Maldcarelli et al.
patent: 4227151 (1980-10-01), Ellis et al.
patent: 4272679 (1981-06-01), Blades
patent: 4293522 (1981-10-01), Winkler
patent: 4304996 (1981-12-01), Blades
patent: 4357668 (1982-11-01), Schwartz et al.
patent: 4418566 (1983-12-01), Beck et al.
Stephen J. Poirier et al., "A New Approach to the Measurement of Organic Carbon" Reprint for American Laboratory, Dec., 1978.
"Photochem Organic Carbon Analyzers", Sybron Corporation Analytical Products.

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