Effect of secondary transformation state of peaty-moorsh soils on adsorption isotherm water vapour

• Autorzy: Sokolowska Z. , Hajnos M. , Matyka-Sarzynska D. , Gawlik J.
• Języki publikacji: EN

Abstrakty

EN

Water vapour adsorption on peat-moorsh soils in various phases of the moorshing process was investigated. The soil material represented two kinds of moorsh: peaty moorsh (Z1) and proper moorsh (Z3) characterizing different classes of peat transformation, i.e., weakly secondary transformed (W1=0.41-0.50), medium secondary transformed (W1=0.51-0.60), strongly secondary transformed (W1=0.61-0.70), very strongly secondary transformed (W1=0,7l-0.80) and completely degraded (W1>0.80). The Brunauer-Emmet and Teller (BET) equation was used to analyse the experimental adsorption results and to calculate the specific surface area from both adsorption and desorplion isotherms. Generally, the values of the specific surface area obtained from desorption isotherms were higher than those obtained from sorption curves. The shape of all curves was similar; i.e., all the curves belonged to the same class of isotherms according to the BE T classification. The values of the correlation coefficient, R, indicated that the BET equation provided a good fit to the experimental data. For all studied samples the BET specific surface area estimated from the sorption isotherm ranged between 250 and 340 m2 g¯1 and between 320-460 m2 ¯1, if the desorption isotherms were used. The average BET specific surface area for the samples of the peaty moorsh (Zi) and the proper moorsh (Z3) were similar. The relationship between surface area and water holding capacity index W1, characterising the state of the secondary transformation was found.

Słowa kluczowe

EN

degradation; peat-moorsh soil; secondary transformation; adsorption; peat soil; soil degradation; transformation; soil; water vapour; specific surface area; habitat condition; agrophysics; plant material

• Wydawca: -
• Czasopismo: Acta Agrophysica
• Rocznik: 2000
• Tom: 26
• Opis fizyczny: p.41-49,fig.

Twórcy

autor

Sokolowska Z.

• Polish Academy of Sciences, Doswiadczalna 4, 20-290 Lublin 27, Poland

autor

Hajnos M.

autor

Matyka-Sarzynska D.

autor

Gawlik J.

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