FIELD: chemistry.
SUBSTANCE: invention can be applied in oil and fat inductry. Method involves oil or fat sampling and sample mixing with reagent. Reagent including 0.1-0.3 parts of molar triethanolamine solution and 0.01-0.03 parts of molar solution of strong base and strong acid in aqueous isopropyl alcohol solution of 50% concentration is used. Oil or fat sample is mixed with reagent for not more than 5 minutes, and pH of obtained mix is defined after mixing. pH value is used to calculate hydrogen ion concentration, and acid value of oil or fat is defined by calibration line designed in 'oil or fat acid value to hydrogen ion concentration in the mix coordinates.
EFFECT: enhanced precision and rate of defining acid value in fats.
1 dwg, 1 tbl, 2 ex
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