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1

Surface fractal dimension of soil materials from pore size distribution data. I. A comparison of two methods of determination

100%
Kozak E., Sokolowska Z., Sokolowski S., Wierzchos J.
Polish Journal of Soil Science
|
1995
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tom 28
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nr 2
77-85
2
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Porozymetria rteciowa na tle innych metod wyznaczania mikrostruktury materialow glebowych

100%
Hajnos M.
Zeszyty Problemowe Postępów Nauk Rolniczych
|
1998
|
tom 461
523-537
Pore size distribution functions obtained from mercury intrusion porosimetry, water potential (pF), and water vapor desorption measurements were calculated and compared for few soil samples differing in granulometric composition, surface area and organic matter content. The pore size distributions calculated for the given sample from various measuring methods differ markedly among others. The highest differences were observed for Othic Podzol, less for Orthic Rendzina and the least for Orthic Luvisol. The variations in pore size characteristics, except of character of soil material, seem to be caused by the assumptions used in pore calculations from particular experimental data and by various ranges of the pores which may be detected by a given method, as well. The full characteristics of the porous system of a porous material may be obtained by comparison of the results obtained using a few methods simultaneously. The use of only one method should not be recommended.
3

Effect of wetting on pore system of soils andminerals as determined by mercury intrusion porosimetry

84%
Jozefaciuk G., Szatanik-Kloc A., Muranyi A.
Polish Journal of Soil Science
|
1998
|
tom 31
|
nr 1
19-24
4
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Wplyw przygotowania probek glebowych materialow porowatych na ich porowatosc oraz wymiar fraktalny

84%
Sokolowska Z., Sokolowski S.
Zeszyty Problemowe Postępów Nauk Rolniczych
|
1998
|
tom 461
539-554
Sodium and calcium forms of montmorillonite and some selected soils formed from loess and from Carpathian flysh were owen dried at 105°C, critical point-dried and freeze-dried. After drying, all samples were outgased up to the pressure 1.3 kPa and next analyzed using mercury intrusion porosimetry. In the case of montmorillonite the average total pore volumes and average pore radii increased depending on applied drying method in following order: owen-drying, critical point drying and freeze-drying. The biggest differences among differently dried samples were observed in the case of sodium montmorillonite. However, in soil material, the total pore volumes for air-dried and owen- dried samples were almost the same. Determined pore size distributions were next used to calculate the surface fractal dimensions. The fractal dimensions for montmorillonite were usually lower than 2, althouh for sodium montmorillonite the values of fractal dimensions higher than 3 were found. For the majority of soil samples the fractal dimensions varied within the range 2 and 3. The results obtained for air-dried soil samples were very similar to those evaluated for owen-dried samples. The influence of drying method on estimated fractal dimensions was evident in the case of monmorillonite and its sodium form, in particular. However, in the latter case the determined fractal dimension (D=4.32) was outside of physically justfied range. In the case of clay minerals, and in the case of swelling clay minerals like montmorillonite in particular, the owen-drying method led to essential changes in the structure of samples. However, the structure changes of the soils owen- dried at 105°C were negligible. Reliability and accuracy of pore size determination are the important factors necessary to correct evaluation of the surface fractal dimension from porosimetric data.
5
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Zastosowanie porozymetrii rteciowej do badan mikrostruktury materialow rolniczych

67%
Konstankiewicz K., Ksiezopolska A., Stawinski J.
Zeszyty Problemowe Postępów Nauk Rolniczych
|
1998
|
tom 461
503-521
The paper discussed the application of mercury porosimetry method to investigations of agricultural materials. Most of these investigations concerned the soil materials. Pores systems of soils were characterized taking into account the pore classifications. The effects of polyamide sorbent on sandy and clay soils microstructure were investigated. Also the influence of mechanical deformations on the dimension of soils particle aggregates and on the microstructure of soil were described. The microporosity of humic fractions (humic acids and ß-humus) and internal porosity of wheat grain and starch extrudates were described.
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