Determining the concentration of a biocide additive in a liquid

摘要

A method and a kit for testing the biocide concentration of a liquid containing a biocide of the type which breaks down in acidic aqueous solution to liberate formaldehyde. A strong aqueous acid is added to the liquid, and a modified Schiff's reagent is also added. Time is given for color to develop, and then the color intensity of the solution is read. In instances where oil-water emulsions or latices are involved, the emulsion is broken before adding the Schiff's reagent.