Comparison of extractable soil carbon and dissolved organic carbon by their molecular characteristics

Abstract

The aim of this study was to compare the molecular characteristics of extractable soil carbon from biotopes of the Rašelinik watershed and dissolved organic carbon (DOC) from Rašelinik creek, by using the 0.1M pyrophosphate, 0.01M CaCl2 and Britton-Robinson buffer as extraction agents. The molecular weight Mr and weight-average molecular weight Mw, determined by the low pressure size exclusion chromatography, increased in the following sequence: humic substances (HS) in CaCl2 < aquatic HS