Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Complexation of Cadmium(II) with Soil Fulvic Acid

  • Me Hae Lee (Department of Chemistry, Korea Advanced Institute of Science and Technology) ;
  • Se Young Choi (Department of Chemistry, Korea Advanced Institute of Science and Technology) ;
  • Hichung Moon (Department of Chemistry, Korea Advanced Institute of Science and Technology)
  • Published : 1993.08.20
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Abstract

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 $NaClO_4$ using the ultrafiltration technique. The conditional stability constants thus obtained were log K= 3.90${\pm}$0.15 and 3.99${\pm}$0.12 $L{\cdot}mol^{-1}$ at fulvic acid concentrations of 101 and 226 mg${\cdot}L^{-1}$ respectively. When free cadmium ion concentration was measured directly using an ion selective electrode, log K of 4.12${\pm}$0.03 $L{\cdot}mol^{-1}$ was obtained. These results show that fulvic acid forms predominately 1 : 1 complex with $Cd^{2+}$ 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.

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