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

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.

¹ Contribution from the Dep. of Soil and Environmental Sciences, University of California, Riverside, CA 92521.

² Professor of Soil Science, Research Associate IV, Research Associate II, and Graduate Research Assistant, respectively.

Received for publication September 24, 1980. Accepted for publication August 26, 1981.

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