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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 14, Number 4
BKCSDE 14(4)
April 20, 1993 

Complexation of Cadmium(Ⅱ) with Soil Fulvic Acid
Me Hae Lee, Se Young Choi, Hichung Moon*
Cadmium(Ⅱ) complexation by a well characterized soil fulvic acid (FA) from the Okchun Metamorphic Belt were studied at pH of 6.0 in 0.1 M NaClO4 using the ultrafiltration technique. The conditional stability constants thus obtained were log K= 3.90±0.15 and 3.99±0.12 L·mol-1 at fulvic acid concentrations of 101 and 226 mg·L-1 respectively. When free cadmium ion concentration was measured directly using an ion selective electrode, log K of 4.12±0.03 L·mol-1 was obtained. These results show that fulvic acid forms predominately 1 : 1 complex with Cd2+ ions. The maximum binding ability of this polyelectrolyte material was 0.886 mmol Cd/g FA. The average gram formula weight of fulvic acid was estimated to be 1130 daltons.
453 - 457
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