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A new model for soil water vapor sorption isotherms considering adsorption and condensation
Soil Science Society of America Journal ( IF 2.9 ) Pub Date : 2020-10-21 , DOI: 10.1002/saj2.20181
Chong Chen 1 , Emmanuel Arthur 2 , Hu Zhou 3, 4 , Xiang Wang 1 , Jianying Shang 1 , Kelin Hu 1 , Tusheng Ren 1
Affiliation  

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 (0.08–0.72 g g−1), clay mineralogy (montmorillonite, kaolinite, and mixed clay samples), and organic C contents (0.001–0.070 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 organic C. The model parameter S0 had the potential for deriving cation exchange capacity, specific surface area, and clay content. The C/S0 values could potentially be used as a proxy of the dominant clay mineral type in a sample.

中文翻译:

考虑吸附和凝结的土壤水蒸气吸附等温线新模型

建立了一个基于Do和Do(2000)模型的新模型,以描述包括吸附和冷凝过程在内的土壤水蒸气吸附等温线(SWSI)。使用33个土壤样品的SWSI值对模型性能进行了评估,这些样品具有广泛的粘土含量(0.08–0.72 gg -1),粘土矿物学(蒙脱石,高岭石和混合粘土样品)和有机碳含量(0.001–0.070 gg)-1)。新模型对测量的SWSI产生了令人满意的拟合,平均相对百分比偏差模量小于6.2%。对于给定的粘土矿物类型,吸附位点和冷凝能力随粘土含量的增加而增加。在给定的粘土含量下,吸附位置的数量为蒙脱土样品(ML)>混合粘土样品(MX)>高岭土样品(KA),且ML和MX的缩合能力均低于KA。对于低粘土含量(<0.12 gg -1)和相似粘土矿物学的土壤,其吸附位点和缩合能力与有机碳成正相关。模型参数S 0具有推导阳离子交换能力,比表面积和重整性的潜力。粘土含量。该ç/ S 0值有可能用作样品中主要粘土矿物类型的替代。
更新日期:2020-10-21
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