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Colorimetric Determination of Oxidizable Carbon in Acid Soil Solutions
Author(s) -
Bartlett Richmond J.,
Ross Donald S.
Publication year - 1988
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1988.03615995005200040055x
Subject(s) - chemistry , soil water , organic matter , total organic carbon , pyrophosphate , carbon fibers , colorimetric analysis , colorimetry , environmental chemistry , inorganic chemistry , chromatography , organic chemistry , environmental science , soil science , materials science , composite number , composite material , enzyme
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 H 2 SO 4 . 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.