Some thermodynamic properties of NHk fixation by loess soil in plowing and clay layers are discussed.The. results indicate that the four ion adsorption equations commonly used can describe the properties of NHk fixati...Some thermodynamic properties of NHk fixation by loess soil in plowing and clay layers are discussed.The. results indicate that the four ion adsorption equations commonly used can describe the properties of NHk fixation in these soils under constant temperature. Among the four adsorption equations, the singlesurface Langmuir equation is the best. When the concentration of NH4Cl solution is 10-1 mol below, the Freundlich equation can be used.The changes of apparent standard free energy (△Go), enthalpy (△Ho) and entropy (△So) illustrate that NHk fixation in soil is an endothermic adsorption and spontaneous reaction, and the process can be enhanced by a higher temperature and clay content in soil.The "proper value of NHk fixation by soil (K1×qm) increased with increasing clay content and temperature. The heat of NHk fixation in soil (Qm) confirms the conclusions made in this paper.展开更多
Effects of temperature and drying and wetting alternation(DWA)on ammonium fixation in manured loessial soil were studied by means of Batch Equilibrium with Varying concentration solutions of ammonium chloride,ammonium...Effects of temperature and drying and wetting alternation(DWA)on ammonium fixation in manured loessial soil were studied by means of Batch Equilibrium with Varying concentration solutions of ammonium chloride,ammonium fixation time,and soil clay contents.The purpose of the research was to find out the pattern of ammonium fixation ted by the varying factors.The results showed a remarkable variation in ammonium fixation.Fixed ammonium increased with temperature and treatments of DWA.The ammonium fixation in manured loessial soil was characterized by the effect of temperature and DWA.展开更多
文摘Some thermodynamic properties of NHk fixation by loess soil in plowing and clay layers are discussed.The. results indicate that the four ion adsorption equations commonly used can describe the properties of NHk fixation in these soils under constant temperature. Among the four adsorption equations, the singlesurface Langmuir equation is the best. When the concentration of NH4Cl solution is 10-1 mol below, the Freundlich equation can be used.The changes of apparent standard free energy (△Go), enthalpy (△Ho) and entropy (△So) illustrate that NHk fixation in soil is an endothermic adsorption and spontaneous reaction, and the process can be enhanced by a higher temperature and clay content in soil.The "proper value of NHk fixation by soil (K1×qm) increased with increasing clay content and temperature. The heat of NHk fixation in soil (Qm) confirms the conclusions made in this paper.
文摘Effects of temperature and drying and wetting alternation(DWA)on ammonium fixation in manured loessial soil were studied by means of Batch Equilibrium with Varying concentration solutions of ammonium chloride,ammonium fixation time,and soil clay contents.The purpose of the research was to find out the pattern of ammonium fixation ted by the varying factors.The results showed a remarkable variation in ammonium fixation.Fixed ammonium increased with temperature and treatments of DWA.The ammonium fixation in manured loessial soil was characterized by the effect of temperature and DWA.
