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- Title
Relating soil specific surface area, water film thickness, and water vapor adsorption.
- Authors
Leão, Tairone Paiva; Tuller, Markus
- Abstract
Estimation of soil specific surface area (SSA) and dry-end water vapor adsorption are important for porous media characterization and for prediction of water and vapor fluxes in arid environments. The objective of the presented study was to model water adsorption, film thickness, and SSA based on the t-curve theory originally developed for N2 adsorption. Data from 21 source soils with clay contents ranging from 0.6 to 52.2% were used to estimate specific surface area based on water retention, a t-curve type method, the linear prediction method, and a simplified monolayer method. The water retention and the t-curve methods were found to be mathematically analogous and were among the most accurate with regard to correlation coefficient (r = 0.97) and root-mean-square error (RMSE = 11.36 × 103 m2/kg) when compared to measurements obtained with the standard ethylene glycol monoethyl ether (EGME) method. The corrected t-curve method significantly overestimated SSA when compared to EGME data. Comparison of all considered methods with N2-BET (BET) measurements disclosed lower correlation coefficients. For soil studies, the vapor adsorption in conjunction with the t-curve or water retention methods should be preferred for SSA estimation as they show much higher correlation with soil clay content and EGME measurements.
- Subjects
SOILS; ADSORPTION (Chemistry); WATER vapor transport; STORM water retention basins; METHOXYETHANOL; CLAY; MATHEMATICAL models
- Publication
Water Resources Research, 2014, Vol 50, Issue 10, p7873
- ISSN
0043-1397
- Publication type
Article
- DOI
10.1002/2013WR014941