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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 1, Number 3
March 20, 1980 

Complexes of Polyvalent Metal Ions (Ⅶ). Complexes of Cadmium, Cobalt and Nickel with Hydroxycarboxylic Acids in Aqueous, Ethanol-Water and Acetone-Water Solutions
Sang Up Choi, Joon Kil Kang
Solutions of Cd2+, Co2+ and Ni2+ were mixed with the solutions of hydroxycarboxylic acids such as salicylic, lactic and mandelic acids in the presence of cation exchange resin at room temperature. The distribution ratios of the metal ions between resin and solution were measured, using radioactive metal ions as tracer. From the observed variation of the distribution ratios with the acid anion concentrations, it was concluded that Cd2+, Co2+ and Ni2+ formed the one-to-one complexes with salicylate, lactate and mandelate ions in aqueous, 20 % ethanol-water and 20 % acetone-water solutions. The results of the present study indicated that the relative stabilities of the metal-acid complexes in solution increased in the order: Cd2+ < Co2+ < Ni2+ complexes. Salicylate < lactate < mandelate complexes. Aqueous < mixed solvent systems.
105 - 109
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