in water ZnSO4 was dissolved in H2O and to it was added ammonium acetate followed by acetic acid; mixture was heated to 60°C and 2-methyl-8-quinolinol was slowly added with const. stirring; ppt. was digested on a water bath, allowed to stand for 1 h, filtered through sintered glass crucible, washed with hot H2O and dried in oven at 160°C;