Regularities of extracting humic acids from soils using sodium pyrophosphate solutions
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 stage...
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| Veröffentlicht in: | Eurasian soil science 2017-02, Vol.50 (2), p.210-217 |
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| creator | Bakina, L. G. Drichko, V. F. Orlova, N. E. |
| description | 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. |
| doi_str_mv | 10.1134/S1064229316120036 |
| format | Article |
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The optically densest humic acids are extracted using sodium pyrophosphate solutions at pH 10. 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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. 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| subjects | Decomposing organic matter Earth and Environmental Science Earth Sciences Extraction processes Forest soils Geotechnical Engineering & Applied Earth Sciences Humic acid Humic acids Humification Humus Phenols Phosphates Sodium Soil Chemistry Soil sciences Soil types |
| title | Regularities of extracting humic acids from soils using sodium pyrophosphate solutions |
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