Biochemical oxygen demand measuring device

Details Biochemical oxygen demand measuring device Biochemical oxygen demand measuring device

1976-03-31

1978-08-08

Tung, T.

Chemistry: electrical and wave energy

Processes and products

Vacuum arc discharge coating

204 1T, 204129, 204231, G01N 2746

Patent

active

041055233

ABSTRACT:
A biochemical oxygen demand measuring device which utilizes the decrease in pressure in an air space above the sample under measurement in a sealed reaction vessel to actuate an oxygen generator which utilizes an electrolysis cell communicating with the reaction vessel. The quantity of oxygen supplied by the oxygen generator is a measurement of the biochemical oxygen demand and is proportional to the quantity of electricity used in the electrolysis cell. Electrical pulses in a chain of constant amplitude and constant duration are applied to the electrolysis cell and the chain of pulses is interrupted by means responsive to the pressure in the reaction vessel to maintain the pressure in the reaction vessel constant. A counter is employed to count the pulses over a period of time as a measurement of the oxygen taken up by the reaction in the pressure vessel. A barometric correction device is employed with a sensing electrode in the electrolysis cell to control the pulses of electrical energy.

REFERENCES:
patent: 3045665 (1962-07-01), Moyat
patent: 3162585 (1964-12-01), DeFord et al.
patent: 3282803 (1966-11-01), Poepel et al.
patent: 3380905 (1968-04-01), Clark
patent: 3403090 (1968-09-01), Tajiri et al.
patent: 3668102 (1972-06-01), Young
patent: 3772176 (1973-11-01), Pippen et al.

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