The growth of fractal humic acids: cluster correlation and gel formation
The growth of humic acids, prepared by a gentle method from two different kinds of soils (I and II), has been studied using small-angle neutron scattering at an acidity corresponding to pH 5.0 and 0.10 M ionic strength (NaCl). Humic acids aggregate either to large clusters with a fractal dimension o...
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| Veröffentlicht in: | Radiation and environmental biophysics 1994-09, Vol.33 (3), p.269-276 |
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| container_title | Radiation and environmental biophysics |
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| creator | Osterberg, R Mortensen, K |
| description | The growth of humic acids, prepared by a gentle method from two different kinds of soils (I and II), has been studied using small-angle neutron scattering at an acidity corresponding to pH 5.0 and 0.10 M ionic strength (NaCl). Humic acids aggregate either to large clusters with a fractal dimension of 2.3 and an average diameter of 1720 A (I) or to clusters with an average diameter of 700 A (II). After storage for 2 days at 4 degrees C, the latter aggregates (II) formed a gel. In a step toward gelation, we observed cluster-cluster interaction from the neutron-scattering data in the form of a correlation peak. These differences in size can be explained by assuming that the smaller particles (II) are trapped into a nonequilibrium state characterized by the temperature-solvent condition. The importance of a humic acid gel network for the conservation of water and nutrients in the environment is discussed. |
| doi_str_mv | 10.1007/BF01212682 |
| format | Article |
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| fulltext | fulltext |
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| ispartof | Radiation and environmental biophysics, 1994-09, Vol.33 (3), p.269-276 |
| issn | 0301-634X 1432-2099 |
| language | eng |
| recordid | cdi_proquest_miscellaneous_76926595 |
| source | MEDLINE; SpringerNature Journals |
| subjects | Gels Humic Substances - chemistry Neutrons Soil - analysis Water Supply - analysis |
| title | The growth of fractal humic acids: cluster correlation and gel formation |
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