ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 14, Number 1
JKCSEZ 14(1)
February 20, 1970 

Formation of the complexes of manganese, zinc and cobaltous ions with citrate ions in aqueous, ethanol-water (20% by volume) and acetone-water (20% by volume) solutions was studied at room temperature by the equilibrium exchange technique. The pH of the solutions was controlled to 7.0-7.4, and the ionic strength of the solutions was kept at approximately 0.10. The results of the present study indicated that both Mn++ and Zn++ formed one to one citrate-compexes, [M Cit]-, in all the solvent systems examined, and that Co++ formed one to one citrate-complex in aqueous solution but formed both one to one citrate-complex, [Co Cit]-, and one to two citrate-complex, [Co Cit2]4-, in the mixed solvent systems mentioned above. It was also observed that the citrate-complexes of the transition metals examined were more stable in the mixed solvent systems than in water.