Research output: Contribution to journal › Article › peer-review
Regularities of extracting humic acids from soils using sodium pyrophosphate solutions. / Bakina, L. G.; Drichko, V. F.; Orlova, N. E.
In: Eurasian Soil Science, Vol. 50, No. 2, 01.02.2017, p. 210-217.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Regularities of extracting humic acids from soils using sodium pyrophosphate solutions
AU - Bakina, L. G.
AU - Drichko, V. F.
AU - Orlova, N. E.
PY - 2017/2/1
Y1 - 2017/2/1
N2 - 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.
AB - 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.
KW - Greyzemic Phaeozem
KW - Haplic Chernozems (Pachic)
KW - humic acids
KW - organic matter
KW - Umbric Retisols (Abruptic)
UR - http://www.scopus.com/inward/record.url?scp=85014706234&partnerID=8YFLogxK
U2 - 10.1134/S1064229316120036
DO - 10.1134/S1064229316120036
M3 - Article
AN - SCOPUS:85014706234
VL - 50
SP - 210
EP - 217
JO - Eurasian Soil Science
JF - Eurasian Soil Science
SN - 1064-2293
IS - 2
ER -
ID: 36815177