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This article in SSSAJ

  1. Vol. 46 No. 2, p. 265-270
     
    Received: Sept 24, 1980


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doi:10.2136/sssaj1982.03615995004600020010x

Trace Metal Chemistry in Arid-zone Field Soils Amended with Sewage Sludge: II. Comparative Study of the Fulvic Acid Fraction1

  1. Garrison Sposito,
  2. Kenneth M. Holtzclaw,
  3. C. S. LeVesque and
  4. Cliff T. Johnston2

Abstract

Abstract

The elemental composition, infrared spectrum, and proton titration curve were determined for (i) the fulvic acid fraction of a Domino soil which had received applications of composted sewage sludge for three years in a field experiment, and (ii) a commercially available fulvic acid extracted from a spodosol. Data showed that the Domino fulvic acid more resembled a typical sludge-derived fulvic acid than a fulvic acid extracted from natural soil organic matter. The distinguishing features of the Domino fulvic acid which led to this conclusion were: (i) a high total sulfur (S) content and the presence of sulfonyl groups, (ii) a significant content of anionic surfactants and S-containing amino acids, (iii) a low glucosamine/galactosamine ratio, and (iv) more than two classes of acidic functional groups. However, the Domino fulvic acid had a much larger content of carboxyl and other acidic functional groups than a typical sludge-derived fulvic acid, evidently because of partial oxidation of the sludge in the Domino soil.

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