Association of alkylammonium salts in low-polarity solvents

29 binary alkylammonium salts (AS), used for extraction and separation of rare and radioactive elements, were taken as examples to show that in the region of high dilutions the concentration dependences of solvent activity is reproduced by mA2/lnfS=A''√mA + B''mA equation much better, than by mA2/lnfS=A' + B'mA equation. A', B', A'', B'' parameters for considered systems were found. Expression for calculating coefficients of AS activity, obtained in result of analytical integration of Giibs-Duhem equation, was suggested