Colorimetric Determination of Oxidizable Carbon in Acid Soil Solutions
- Richmond J. Bartlett and
- Donald S. Ross
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.
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