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Temperature-dependent restructuring of fractal humic acids: A proton-dependent process
AbstractHumic acid particles stored at low temperature (4°C) show a fractal dimension of 1.8. When the temperature is increased to 22°C the fractal dimension () of the particles in solution increases with time and becomes constant at after 34 h. This is shown by small angle neutron scattering (SANS) on D2O solutions with an acidity corresponding to pH 5.0 and 0.1 M ionic strength. This observation can be explained by the assumption that the low-temperature aggregation proceeds via cluster-cluster interaction and that the clusters formed restructure at higher temperature to form more compact particles. Electromotive force measurements show that this restructuring is accompanied by a fast release of protons followed by a slow consumption of protons. In agreement with the SANS data, the slow uptake of protons relaxes with a value of tau = 22 h, corresponding to 63.2% transformation. The implication of the present results for the transport of water and ions in the soil is discussed.
Temperature-dependent restructuring of fractal humic acids: A proton-dependent process
AbstractHumic acid particles stored at low temperature (4°C) show a fractal dimension of 1.8. When the temperature is increased to 22°C the fractal dimension () of the particles in solution increases with time and becomes constant at after 34 h. This is shown by small angle neutron scattering (SANS) on D2O solutions with an acidity corresponding to pH 5.0 and 0.1 M ionic strength. This observation can be explained by the assumption that the low-temperature aggregation proceeds via cluster-cluster interaction and that the clusters formed restructure at higher temperature to form more compact particles. Electromotive force measurements show that this restructuring is accompanied by a fast release of protons followed by a slow consumption of protons. In agreement with the SANS data, the slow uptake of protons relaxes with a value of tau = 22 h, corresponding to 63.2% transformation. The implication of the present results for the transport of water and ions in the soil is discussed.
Temperature-dependent restructuring of fractal humic acids: A proton-dependent process
Österberg, Ragnar (author) / Szajdak, Lech (author) / Mortensen, Kell (author)
Environmental International ; 20 ; 77-80
1993-11-30
4 pages
Article (Journal)
Electronic Resource
English
Temperature-dependent restructuring of fractal humic acids: a proton-dependent process
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