Patent ID: 9164069
Filing Date: 2015-10-20
Classification: C09K,G01N,Y10T

Abstract:
1. A potentiometric titration method of a mixed acid solution, comprising steps as follows: step 1, preparing an alkali-alcohol solution of a concentration in 0.1˜0.2 mol/L, and titrating the concentration of the alkali-alcohol solution with a basis reagent by using an automatic titrator; step 2, adding a first solvent and a second solvent into a mixed acid solution consisted of nitric acid, phosphoric acid and acetic acid, then stirring the first solvent, the second solvent and the mixed acid solution to form a mixed system, and titrating the mixed system with the alkali-alcohol solution titrated in the step 1 to obtain three equivalence points of the nitric acid, phosphoric acid and acetic acid in the mixed system by using the automatic titrator, wherein a volume ratio of the first solvent to the second solvent is 8˜16:1, the first solvent is ethanol, and the second solvent is ethylene diamine or butylamine; and step 3, according to the principle of mass conservation, measuring a content of each acid in the mixed system with the three equivalence points obtained in the step 2.