Resumo

EYHERABIDE, Mercedes; SAINZ ROZAS, Hernán; BARBIERI, Pablo  e  ECHEVERRIA, Hernán Eduardo. COMPARISON OF METHODS FOR DETERMINING SOIL ORGANIC CARBON. Cienc. suelo [online]. 2014, vol.32, n.1, pp.13-19. ISSN 1850-2067.

Beneficial effects of soil organic carbon (COT) on physical, chemical and biological properties, is considered an indicator of soil quality, so it is necessary to determine it accurately. Walkley & Black, modified Walkley & Black and ignition (LOI) with respect to the dry combustion method of Dumas were compared for some soils of the Pampean and extrapampean region. A high correlation between COT determination techniques (r² = 0.98-0.99) was obtained. Correction factor of 1.32, commonly used in the methodology of Walkley & Black to convert readily oxidizable carbon (CFO) in COT was verified. It was observed that the slope of the relationship between the COT determined by LOI and COT determined by the Dumas method (1.697) did not differ in value from 1,724, routinely used for the conversion of COT a MO. Dumas methodology showed greater accuracy and precision with respect to other techniques for determination of COT.

Palavras-chave : Analysis of soil organic matter; wet oxidation; combustion; calcination.

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