Comparison of the composition of humic and fulvic acids prepared by the IHSS method and NAGOYA method
| Autor: | Shozo Kuwatsuka, Shigemitsu Arai, Kazuhito Itoh, Akira Watanabe |
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| Rok vydání: | 1994 |
| Předmět: | |
| Zdroj: | Soil Science and Plant Nutrition. 40:601-608 |
| ISSN: | 1747-0765 0038-0768 |
| DOI: | 10.1080/00380768.1994.10414299 |
| Popis: | The composition of humic acids (HAs) and fulvic acids (FAs) prepared by the NAGOYA (Nagoya University) method and the IHSS (International Humic Substances Society) method was investigated using an an do soil and a brown forest soil. Extraction with a smaller volume of 0.1 N NaOH in the IHSS method yielded HAs containing larger amounts of 0, carboxyl groups, alcoholic hydroxyl groups, hexoses, and uronic acids than those prepared by the NAGOYA method. The contents of C, carbonyl groups, and amino acids were higher in the HAs obtained by the NAGOYA method. The relative content of aromatic C was higher in the HAs prepared by the NAGOYA method, especially in the ando soil. The FAs prepared by the IHSS method contained smaller amounts of H, N, alcoholic hydroxyl groups, saccharides, and amino acids than the F As obtained by the N AGOY A method, mainly due to the XAD-8 treatment in the IHSS method. The saccharide and amino acid contents in the XAD-8-adsorbed fractions obtained from the FAs prepared by ... |
| Databáze: | OpenAIRE |
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