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Soil Science Society of America Journal Abstract -

Colorimetric Determination of Oxidizable Carbon in Acid Soil Solutions


This article in SSSAJ

  1. Vol. 52 No. 4, p. 1191-1192
    Received: May 26, 1987

    * Corresponding author(s):
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  1. Richmond J. Bartlett  and
  2. Donald S. Ross
  1. Department of Plant and Soil Science, Univ. of Vermont, Burlington, VT 05405



A simple and sensitive method is described that determines, colorimetrically, oxidizable organic matter in solutions from acid soils. It relies on measuring the loss of color by a Mn(III)-pyrophosphate complex as Mn(III) becomes reduced by organic C in the presence of concentrated H2SO4. The method is applicable to 1-mL samples containing 0.08 to 4.0 µmol of organic C and is practically free of interferences in aerobic solutions.

Research supported by the Vermont Agric. Exp. Stn., Univ. of Vermont. This research was supported in part by grants from the Electric Power Res. Inst., contract RP2365, ALBIOS project, and by the U.S. Dep. of Energy, DE-AS05-83ER60179.

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