Regularities of extracting humic acids from soils using sodium pyrophosphate solutions

L. G. Bakina, V. F. Drichko, N. E. Orlova

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Regularities of extracting humic acids from different soil types (soddy-podzolic soil, gray forest soil, and all chernozem subtypes) with sodium pyrophosphate solutions at different pH values (from 5 to 13) have been studied. It is found that, regardless of soil type, the process occurs in two stages through the dissociation of carboxylic groups and phenolic hydroxyls, each of which can be described by a logistic function. Parameters of the logistic equations approximating the extraction of humic acids from soils at different pH values are independent of the content and composition of humus in soils. Changes in the optical density of humic acids extracted from soils using sodium pyrophosphate solutions with different pH values are described in the first approximation by the Gaussian function. The optically densest humic acids are extracted using sodium pyrophosphate solutions at pH 10. Therefore, it is proposed to use an extract with pH 10 for the characterization of organic matter with the maximum possible degree of humification in the given soil.

Original languageEnglish
Pages (from-to)210-217
Number of pages8
JournalEurasian Soil Science
Volume50
Issue number2
DOIs
StatePublished - 1 Feb 2017

Scopus subject areas

  • Soil Science
  • Earth-Surface Processes

Keywords

  • Greyzemic Phaeozem
  • Haplic Chernozems (Pachic)
  • humic acids
  • organic matter
  • Umbric Retisols (Abruptic)

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