A method of purifying ZnSO4 by ion exchange resin is described. The nitroso-R=salt is selected as the anionic complex-formation agent, with the help of which heavy metal ions in ZnSO4 solution are seperated out by the anion exchanger. The properties of some resins from different manufacturers, the amonnt of anionic complex-formation agent to be applied, the condition under which ion exchange takes place and the regeneration of resin are presented. Results of testing of the final product by different methods are given.lon exchanger may also be utilized for the purification of chlorides of Zn, Mg, Ca, Sr, Ba, -Na, etc., and some of the sulfates.