Abstract
Soil is a system exhibiting strong electrostatic field in aqueous solution, even though it is electrically neutral macroscopically. Therefore, the gradient of electric potential will be the main driving forces for ions transportation, adsorption/desorption in the soil. In this chapter, we will firstly discuss the theoretical descriptions for mass diffusion in a system with multi-potential fields. Based on macroscopic thermodynamic analysis, a generalized linear theory for describing non-linear diffusion in external fields and non-ideal systems, such as soil, can be established, and this theory included: a generalized linear flux equation for non-linear diffusion; an apparent mass conservation equation and a generalized linear non-steady state equation for non-linear diffusion. This section is critical in ion diffusion/adsorption study in soil, because in this theory the coupling diffusion with multiple driving forces in soil have been unified to a single force: the apparent concentration gradient, and which changes the complex non-linear diffusion problem of ions in soil to linear. In the second section, we will discuss the electrostatic field effect from surface charges of soil particles on ion exchange equilibrium. In this section, we will show that, the electrostatic adsorption of cations in soil can be treated as a diffusion process driven by the apparent concentration gradient of ions in the external electric field from soil particle surface. Therefore the electrostatic adsorption/desorption process and the diffusion process in the electric field of soil are essentially the same process, and can be treated as one. Based on this concept, new ion equilibrium distribution equations for describing ion exchange equilibrium can be obtained, and those equation clearly show how the surface charges, the electric field strength, ionic volume and ionic interaction in soil solution influence the exchange. In the last section, we will discuss the electrostatic field effect from surface charges of soil particles on ion adsorption/diffusion kinetics. In this section, we will show that, the electric field in the soil exerts a significant influence on ion adsorption and diffusion kinetics. By considering the electric field from soil particle surface, new exact kinetic equations for describing cation adsorption can be developed. The new equations show that, when both strong force adsorption and weak force adsorption coexist in an exchange experiment, the initial stage of strong force adsorption can be described by the zero-order kinetics. The adsorption then shifts to the first-order kinetics of the weak force adsorption. The new kinetic equations are mathematically precise, and they were derived from the actual physical mechanism of cation adsorption. Thus, those new equations are fundamentally different from the classic apparent kinetic equations. All the parameters in the new equations have definite physical significance. Therefore, using the new equations, some important dynamic and thermodynamic parameters in cation exchange can be estimated from the experimental data.
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Li, H., Li, R., Liu, X., Hou, J. (2013). The Electrostatic Field Effect from Surface Charges on Ion Diffusion/Adsorption in Soil. In: Xu, J., Sparks, D. (eds) Molecular Environmental Soil Science. Progress in Soil Science. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-4177-5_9
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