NH4OH; Na2C2H3O2; Ni(NH4)2(SO4)2*6H2O in water Electrochem. Process; electrochem. depn. from soln. of Ni(NH4)2(SO4)2*6H2O, ZnSO4*H2O (Ni:Zn=1:4 molar ratio), NaC2H3O2 at room temp., pH=9.0-9.5 adjusted with NH4OH;

heating ZnSO4*H2O at >240 °C;;

removal of water at 238 °C;;

in water

in water byproducts: BaSO4; Ba(NCS)2*3H2O and ZnSO4*H2O stirred in H2O; ppt. filtered off, water removed from filtrate by heating, residue driedat 80°C; detd. by XRD;