PROCESS AND APPARATUS FOR DETERMINING OXYGEN COMSUMPTION OR GAS PRODUCTION IN CHEMICAL REACTIONS

摘要

1377044 Measuring absorption or evolution of gas BAYER A G 16 Jan 1973 [19 Jan 1972] 2187/73 Heading G1B A method for measuring the amount of gas evolved or absorbed by a system which is present in a sealed measuring vessel comprises compensating for the pressure changes produced in the vessel by the system by supplying to or removing from the vessel sufficient gas to restore the pressure to its previous level, the gas being supplied or removed in a plurality of portions of equal volume, all measured at the same pressure and temperature and in which the number of portions is counted. As applied to measuring the biological oxygen demand of sewage, a vessel 1 is connected by a three-way cock 5 to an oxygen reservoir 7 or a manometer 10 provided with contacts 25 and 26; a change of level from 25 to 26 represents one volume unit of oxygen added and the necessary number of such units is counted.