Investigations on efficiency of refining of acetic acid by normal freezing method with radiotracer technique and neutron activation are presented. Equilibrium distribution coefficient for Zn2+in CH3COOH was determined; the same coefficient was also determined for Cl−but with lower degree of approximation and a “generalized” distribution coefficient for a set of ions was estimated by comparison of radioactivity of original and refined samples of acetic acid after neutron activation in nuclear reactor.