Effect of humic acids, sesquioxides and silica on the pore system of silt aggregates measured by water vapour desorption, mercury intrusion and microtomography

摘要: Summary Most of the information on soil aggregation and porosity comes from studies natural in which effects different constituents that form structure overlap. The aim this research was to study these separately well-characterized artificial aggregates order understand them better. To do this, pore system model silt aggregates, amended with amounts humic acids, iron aluminium hydroxides or colloidal silica, investigated at three levels magnification water vapour desorption (nanometre sizes), mercury intrusion (micrometre sizes) microtomography (tens micrometres). Humic acid hydroxide increased aggregate porosities measured by all methods. An increase increasing additions each constituent indicated only desorption. We did not observe any well-defined trends dynamics average radii. surface fractal dimension determined negatively correlated granular media comprises larger voids joined narrower necks; therefore, we attempted relate their sizes a novel approach combined extrusion data. observed decrease size necks give access same constituents. With effect smallest. data showed formation separate concretions silica aggregates.