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學院發表文章

A new model for soil water vapor sorption isotherms considering adsorption and condensation

發布日期:2021-04-30瀏覽次數:信息來源:土(tu)地科學(xue)與(yu)技術學(xue)院(yuan)

Chong Chen   Emmanuel Arthur   Hu Zhou   Xiang Wang   Jianying Shang   Kelin Hu   Tusheng Ren

Abstract

A new model, which was based on the Do and Do (2000) model, was developed to describe soil water vapor sorption isotherms (SWSIs) including both adsorption and condensation processes. The model performance was evaluated using measured SWSIs of 33 soil samples with a wide range of clay contents (0.08 to 0.72 g g-1), clay mineralogy (montmorillonite, kaolinite, and mixed clay samples), and organic carbon contents (0.001 to 0.070 g g-1). The new model produced satisfactory fits to measured SWSIs, with the mean relative percentage deviation modulus less than 6.2%. For a given clay mineral type, the adsorption sites and condensation capacity increased with increasing clay content. At a given clay content, the number of adsorption sites was in the order of montmorillonitic samples (ML) > mixed clay samples (MX) > kaolinitic samples (KA), and the condensation capacities of ML and MX were lower than that of KA. For soils with low clay content (< 0.12 g g-1) and similar clay mineralogy, the adsorption sites and condensation capacities were positively related to soil organic carbon (SOC). The model parameter S 0 had the potential for deriving cation exchange capacity (CEC), specific surface area (SSA), and clay content. The C/S 0 values could potentially be used as a proxy of the dominant clay mineral type in a sample.


A new model for soil water vapor sorption isotherms considering adsorption and condensation.pdf

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