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This article in SSSAJ

  1. Vol. 43 No. 6, p. 1148-1155
     
    Received: May 11, 1979
    Accepted: Aug 1, 1979


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doi:10.2136/sssaj1979.03615995004300060018x

Cupric Ion Complexation by Fulvic Acid Extracted from Sewage Sludge-Soil Mixtures1

  1. Garrison Sposito,
  2. Kenneth M. Holtzclaw and
  3. C. S. LeVesque-Madore2

Abstract

Abstract

The complexes formed between Cu2+ and fulvic acid extracted from sewage sludge were investigated by potentiometric titration of K/H fulvate with Cu(ClO4)3 at pH 5 and 25°C, in an ionic medium of 0.1M KClO4. Formation functions, giving the number of moles of Cu2+ bound per mole of K/H fulvate, were calculated from the titration data and plotted against the molar concentration of Cu2+, with the concentration of K/H fulvate being a fixed parameter for each plot. These functions were analyzed by the Scatchard plot method and were interpreted as evidence of: (i) a relatively strong 1:1 complex (log cK = 3.9) that is formed between Cu2+ and the most acidic functional groups in fulvic acid and (ii) a weaker set of complexes (log eK = 2) that is formed between Cu2+ and the more weakly acidic functional groups acting as both unidentate and bidentate ligands.

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