Abstract
Samples of kaolin amended with different amounts of humic acid extracted from a Cambic Areosol under forest are investigated. We measure water vapour adsorption isotherms and mercury intrusion pore size distributions. Experimental adsorption isotherms are analyzed by means of Frenkel–Hill–Halsey (FHH) type equation. This analysis leads to the determination of the surface fractal dimension. The fractal dimensions obtained from adsorption isotherms are next compared with those resulting from the analysis of mercury intrusion data. The calculations performed indicate consistently fractally rough surface structure for all the samples. However, the changes of the surface properties of the samples are not proportional to the amount of humic acid added. The fractal dimension is the highest for untreated kaolin, attains a minimum for samples with a small amount of humic acid added and smoothly increases to a constant value, which is significantly lower than that characteristic for pure humic acid.
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