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Variable surface charge of selected peat materials as determined from back titration

100%

Matyka-Sarzynska D. , Sokolowska Z. , Jozefaciuk G.

tom 26

The surface charge studies were conducted on peat materials at various states of the secondary transformation characterized by W1 index. A back titration method for the determination of the variable surface charge was applied and distribution of the apparent surface dissociation constant for investigated soils were determined. In this method the peat suspensions were titrated with 0.1 N NaOH in IN NaCl solution. For weakly and medium secondary peats positive correlation between quality of the surface charge and the W1 index was found. The best correlation appeared between the surface charge and the summary content of fulvic and humic acids. However, for proper moorsh material two populations can be distinguished. For all samples very strongly acidic surface sites are dominant. Furthermore, the average apparent surface dissociation constant values were similar for all peat-moorsh soils.

Relation between the water capacity index and selected surface properties of peat-muck soils

100%

Sokolowska Z. , Matyka-Sarzynska D. , Hajnos M. , Gawlik J.

tom 36

nr 1

The studies were conducted on peat materials at various states of secondary transformation characterised by the W1 index. The positive correlation between the specific surface area calculated from water vapour adsorption and the water holding capacity index W1 was found. However, no direct relationship between the specific surface area determined from nitrogen adsorption was noticed. The variable surface charge increases with the value of W1 for all samples. The soils investigated are divided into two groups. For investigated soils only the dispersive surface free energy component can be determined. Contact angles were calculated using the component of the surface free energy and water surface tension determined earlier by the Young equation.