METHOD AND DEVICE FOR THE DETERMINATION OF FILM FORMING AMINES IN A LIQUID

A photometric method for determination of a film forming amine in a liquid, comprises a) providing a buffer solution of a weak acid having a pKa≥4.5 and a strong acid having a pKa≤1; b) diluting an aliquot of the buffer solution with water, and determining the pH of said diluted buffer solution; c) adding reagent to said diluted buffer solution and measuring an initial absorbance of said diluted buffer/reagent solution; d) preparing a sample solution by adding liquid containing the film forming amine to an aliquot of the buffer solution and measuring the pH of the sample solution; e) adjusting the pH of the sample solution to match the pH of the diluted buffer solution by adding strong acid; and f) adding said reagent to the pH adjusted sample solution to form a colored complex, and measuring the absorbance of the resulting solution a photometer.