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Abstract

A method for measuring the chemical content of bleaching liquor within the cellulose pulp industry, in which a sample of the bleaching liquor is brought together with one or more reagents, of which at least one is chemiluminescent so as to result in the emission of light, and the intensity of the light is determined as a measurement of the chemical content. The method is characterized in that a constant flow of reagent is advanced continuously through a conduit system and in that a small quantity of sample liquor is introduced sporadically or intermittently into said reagent flow so as to produce a chemiluminescent reaction, and in that the reaction, and therewith the emission of light, is caused to continue for a given period of time such that the light intensity falls within the measuring range of a light responsive device, and in that, with repeated measurements the light intensity is constantly measured after said time interval, and in that measured values of the light intensity are converted to the content of bleaching chemical. The invention also relates to apparatus for carrying out the aforedescribed method.

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First Claim