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

• Main Authors: RAMMINGER UTE, FANDRICH JORG, NICKEL ULRICH
• Format: Patent
• Language: Chinese; English
• Published: 03.11.2020
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

A photometric method for the determination of a film forming amine in a liquid, comprises the steps of 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 a given volume of water, and determining a pH value of said diluted buffer solution; c) adding a given amount of a reagent to said diluted buffer solution and measuring an initial absorbance of said diluted buffer solution containing the reagent; d) preparing a sample solution by adding a given volume of the liquid containing the film forming amine to an aliquot of the buffer solution and measuring a pH value of the sample solution; e) adjusting the pH value of the sample solution to match with the pH value of the diluted buffer solutionby adding a calculated amount of the strong acid; and f) adding a given amount of said reagent to the pH adjusted sample solution to form a colored complex, and measuring the absorbance of the pH adjusted sample solution cont