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This article in SSSAJ

  1. Vol. 47 No. 5, p. 898-902
     
    Received: June 8, 1982
    Published: Sept, 1983


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doi:10.2136/sssaj1983.03615995004700050011x

Trace Metal Chemistry in Arid-Zone Field Soils Amended with Sewage Sludge: III. Effect of Time on the Extraction of Trace Metals1

  1. Garrison Sposito,
  2. C. S. LeVesque,
  3. Joseph P. LeClaire and
  4. A. C. Chang2

Abstract

Abstract

The surface horizons of two arid-zone field soils that either had received amendments of composted sewage sludge annually since 1975, or had received amendments of liquid sludge between 1976 and 1978, were fractionated by sequential extraction for 4 years annually, beginning in 1979, to compare the solid-phase forms of Ni, Cu, Zn, Cd, and Pb. The total concentration of each trace metal in the soils continually receiving composted sludge increased with time, whereas the total concentration of the metals in the soil that had received liquid sludge until 1978 did not increase with time. Regardless of the time variation of total metal concentration, the percentages of the metals in either the EDTA (ethylenedinitrilote-traacetic acid)-extractable fraction or the HNO3-extractable fraction often tended to increase with time in the soils. This trend was more evident in the lighter-textured field soil receiving composted sludge. It was concluded that the observed increase in EDTA-extractable trace metals with time could be the result of the formation of trace metal carbonates accompanying the gradual mineralization of the organic matter in the applied sludge in the soil environment.

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