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This article in SSSAJ

  1. Vol. 41 No. 4, p. 736-741
     
    Received: Aug 25, 1975


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doi:10.2136/sssaj1977.03615995004100040025x

Oxidation of Elemental Sulfur in Soils1

  1. Y. M. Nor and
  2. M. A. Tabatabai2

Abstract

Abstract

Studies of oxidation of elemental S in soils showed that thiosulfate and tetrathionate are produced during S oxidation in soils. In this work, unamended and elemental S-amended soils were incubated (30°C) under aerobic conditions for various times. The amounts of S2O3-, S4O6-, and SO4-S produced during incubation were determined. Results showed that S2O32- was produced within the first few days of incubation and that S4O62- accumulated in some soils. The rate of S oxidation increased with increasing incubation temperature (5, 15, and 30°C) and with increasing the rate of S application (50, 100, and 200 µg S/g soil). For 100 µg S/g soil, the rates of oxidation of elemental S in 10 Iowa surface soils ranged from 39 to 75 µg S/g soil after incubation at 30°C for 70 days; rates were more rapid in alkaline soils than in acid soils. There was little change in pH of soils even when the S application rate was increased from 50 to 200 µg S/g soil. The rate of S oxidation was lower in air-dried soils than in field-moist soils.

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