METHOD FOR DETERMINING ACIDITY (PH) OF MILK AND DIARY PRODUCTS Russian patent published in 2003 - IPC

FIELD: food production technology. SUBSTANCE: method involves measuring electromotive force of electrode system having measuring electrode, and chlorosilver reference electrode, reducing pH value under control to 20 C. Then, product temperature is additionally measured. The pH value reduced to 20C C is determined from formula , where pH_r20 is the product pH value at 20C temperature, in pH units; E_es is the electromotive force of electrode system, in mV; E_i and pH_i are the electromotive force isopotential point coordinates, in mV and pH units; S₂₀ is electrode system characteristic steepness at 20 C, S₂₀ = 58,16 mV/pH;, t is the temperature of medium under control, in grades of C; α- is the temperature coefficient of electromotive force; α = 0,198 mV/pH^°C; 0.0128 and 0.003 are the adjustments for milk pH changes depending o temperature calculated from experimental data. EFFECT: high accuracy of measurements.