METHOD OF DETERMINING pH OF LOW-BUFFER MAXIMALLY DILUTED CONDENSATE-TYPE AQUEOUS SOLUTIONS Russian patent published in 2016 - IPC G01N21/27 G01N33/18 

FIELD: chemistry.

SUBSTANCE: method includes consecutive procedures for preparing a flow sample by cooling a sample to 10-50°C and reducing pressure to atmospheric pressure, conductometric measurement of electroconductivity (χ^t) and temperature (t) of a straight sample, passing the sample through an H-cationite column, conductometric measurement of electroconductivity (χ^t _H) and temperature (t_H) of an H-cationated sample, reducing the measured electroconductivity values to temperature of 25°C (χ, χ_H), checking accuracy, determining the difference between electroconductivity values of the straight and H-cationated samples (χ-χ_H) and calculating the pH value by solving a system of equations of ionic equlibria of the aqueous solution.

EFFECT: providing a method of determining pH of low-buffer maximally diluted condensate-type aqueous solutions, which provides accurate and fast determination of pH, and is cost-effective and easy to use.

2 tbl, 2 dwg