Characteristics of Ammonium Nitrogen Adsorption on Salinized Fluvo-Aquic Soils in Coastal Dry Croplands
In the coastal area of northern Jiangsu Province,the salinized fluvo-aquic soil has been amended for a long period through implementing of cultivating measures.It is pivotal to elucidate the characteristics of ammonium nitrogen adsorption on the salinized fluvo-aquic soil for control of nitrogen loss risk.Typical salinized fluvo-aquic soil samples were collected to conduct the laboratory experiments on ammonium nitrogen adsorption.The processes of adsorption isotherm were described,and effects of initial concentration and pH were revealed.Subsequently,kinetic and thermodynamic characteristics were illuminated.Results showed that equilibrium adsorption of ammonium nitrogen is in accordance with Langmuir isotherm,indicating the adsorption mode is mainly the single molecular layer electrical adsorption.The adsorption process fits the Elovich equation well.Increases in the initial concentration and pH of solutions and decrease in temperature could enhance the adsorption amount of ammonium nitrogen,while suppress adsorption rates.The thermodynamic parameter estimation reveals that the adsorption is an exothermic process.Higher energy barrier needs to be overcome as initial concentration rises.
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