Colorimetric Determination of Oxidizable Carbon in Acid Soil Solutions

摘要: 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 C presence concentrated H2SO4. The applicable to 1-mL samples containing 0.08 4.0 μmol practically free interferences aerobic solutions.