Diffusion of Chloride Ions in Soils: Ⅱ. Kinetic and Thermodynamic CharacteristicsEnglish Full Text
XU MINGGANG; ZHANG YIPING and LIU WEINING (Department of Soil Science and Agrochemistry, Northwestern Agricultural University, Yangling, Shaanxi 712100 China)
Abstract: The amounts of chloride ions diffused in four soils of different textures at the same water content under different temperature and at varied time were measured by the diffusion cell method using 36Cl-labelled CaCl2 solution. Five kinetic models were used to fit the dynamic process of the diffusion of chloride ions in the soils. It was found that Elovich equation or power function equation was the best model to describe the process. The pseudothermodynamic parameters, i. e. the net reaction energyl the activation entropy,activation enthalpy and activation free energy of the diffusion, were derived from the absolute reaction-rate theory. The results showed that these parameters decreased in the order of loessal soil ＞ black in soil ＞lou soil ＞ yellow cinnamon soil, which indicated that the force and the heat-energy barrier to be overcome for diffusion decreased, the diffusion rate increased and the disorder of the soil-solution-ion system due to diffusion decreased successively with the texture becoming heavier in the four soils.
- Series：
(D) Agriculture
- Subject：
Fundamental Science of Agriculture; Agronomy
- Classification Code：
S153
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