• 关键词：水溶性有机物  释放动力学  沉积物  草甸沼泽土

• 基金项目：国家杰出青年基金, 国家自然科学基金

• 林滨
• 北京大学城市与环境学系, 北京 100871

• 陶澍
• 北京大学城市与环境学系, 北京 100871

• 刘晓航
• 北京大学城市与环境学系, 北京 100871

• 摘要：模拟研究了沉积物与草甸沼泽土中水溶性天然有机物从固相向水相释放的动力学过程，探讨了流速、温度和pH条件对土壤和沉积物中水溶性有机物释放速度的影响。研究结果表明：上述过程可以用滞膜模型（单膜）加以描述，释放为典型的一级动力学过程，且草甸沼泽土中水溶性有机物的释放较沉积物快。流速、温度、pH及固相的结构特征是影响水溶性有机物释放速率的重要因素。

• Abstract：Release process and kinetics of naturally occurring water soluble organic compounds from sediment and riverside wetland soil were investigated. The influences of flow velocity, temperature, and pH value on the kinetics were discussed. The results demonstrated that the release of the material is a typical first order process, which can be well characterized by a stagnant film model. Due to the porous texture of the wetland soil, the release coefficient of it is much higher than that of the sediment. The release process could be speeded up by increasing the flow rate or pH value. The optimal temperature for the release is around 20℃.

• Key words：soluble organic carbon  release kinetics  sedimentm  soil.

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