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

Abstract

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.

Keywords

References

  1. IUPAC Environmental Analytical and Physical Chemistry Series v.1 Environmental Particles Buffle, J.;van Leeuwen, H. P.
  2. Geochim. Cosmochim. Acta v.41 Reuter, J. H.;Perdue, E. M.
  3. Bull. Korean Chem. Soc. v.14 Lee, M. H.;Choi, S. Y.;Moon, H.
  4. Bull. Korean Chem. Soc. Shin, H. S.;Moon, H.;Yang, H. B.;Yun, S. S.
  5. Bull. Korean Chem. Soc. v.14 Lee, M. H.;Choi, S. Y.;Chung, K. H.;Moon, H.
  6. Anal. Chem. v.50 Brenahan, W. R.;Grant, C. L.;Weber, J. H.
  7. Soil Sci. Soc. Am. J. v.46 Sposito, G.
  8. Geochim. Cosmochim. Acta v.54 Buffle, J.;Altmann, R. S.;Filella, M.;Tessier, A.
  9. Handbook of Proton Ionization Heats and Related Thermodynamic Quantities Christensen, J. J.;Hansen, L. D.;Izatt, R. M.
  10. Critical Stability Constants v.3 Martell, A. E.;Smith, R. M.
  11. Environ, Sci. Technol. v.16 Saar, R. A.;Weber, J. H.
  12. Can. J. Chem. v.57 Saar, R. A.;Weber, J. H.
  13. Environ. Toxicol. Chem. v.5 Giesy, J. P.;Albert, J. J.;Evans, E. W.
  14. Heavy Metal Pollution in Japan Kitagashi, K.;Yamane, I.
  15. Water Res. v.18 Sterritt, R. M.;Lester, J. N.
  16. Geochim. Cosmochim. Acta v.48 Perdue, E. M.;Reuter, J. H.;Parrish, R. S.
  17. Soil Sci. Soc. Am. J. v.48 Fitch, A. H.;Stevenson, F. J.
  18. Anal. Chem. v.62 Susetyo, W.;Dobbs, J. C.;Carreira, L. A.;Azarraga, L. V.;Grimm, D. M.
  19. Environ, Sci. Technol v.17 Perdue, E. M.;Lytle, C. R.
  20. Anal. Chem. v.53 Curtis, M. A.;Witt, A. F.;Schram, S. B.;Roger, L. B.
  21. Soil Sci. v.155 Stevenson, F. J.;Fitch, A. H.;Bara, M. S.