Complexation of Cadmium(Ⅱ) with Soil Fulvic Acid : Effect of pH and Fulvic Acid Concentration

풀빅산과 카드뮴(Ⅱ)과의 착화합 반응 : 풀빅산의 농도와 pH의 영향

  • 최세영 (한국과학기술원 화학과) ;
  • 정근호 (한국과학기술원 화학과) ;
  • 전송희 (한국과학기술연구원 화학과) ;
  • 문희정 (한국과학기술원 화학과)
  • Published : 19940800


The complexation of cadmium(II) with a well characterized local soil fulvic acid was investigated at different solution pH and fulvic acid concentration using ion selective electrode. The stability constants were determined using a continuous distribution model based on Scatchard Plot; this model takes into consideration the diversitv of cation binding sites on a naturally occurring organic macromolecules even if the nature of the binding sites may not be known. The mean value of $logKi(\mu)$ was found to increase at higher pH(pH 4.0: ${\mu}=3.79{\pm}0.74$ l\;mol^{-1}; pH 6.0: ${\mu}=4.51{\pm}0.78$ l\;mol^{-1}$), and in more dilute fulvic acid concentration([FA] = 50 mgl$^{-1}: {\mu}=4.16{\pm}0.60$ l\;mol^{-1}; [FA]=151 mgl$^{-1}:{\mu}=3.75{\pm}0.5\;l\;mol^{-1}$). The intrinsic constant(logKint) for binding at the strongest site was measured to be around $4.72\;l\;mol^{-1}$ at both pH4.0 and 5.0, but was found to be increased to $6.03\;l\;mol^{-1}$ when pH was 6.0.



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