• 关键词：多环芳烃  长江  沉积物再悬浮  释放动力学  再悬浮模拟装置

• 基金项目：国家重点基础研究发展计划(973)项目(No. 2003CB415204);国家自然科学基金(No. 40701166)

• 冯精兰
• 1. 河南师范大学化学与环境科学学院,黄淮水环境与污染防治教育部重点实验室,河南省环境污染控制重点实验室,新乡 453007;
  2. 北京师范大学环境学院,水环境模拟国家重点实验室,北京 100875

• 王丽霞
• 中国科学院东北地理与农业生态研究所,长春 130012

• 翟梦晓
• 河南师范大学化学与环境科学学院,黄淮水环境与污染防治教育部重点实验室,河南省环境污染控制重点实验室,新乡 453007

• 孙剑辉
• 河南师范大学化学与环境科学学院,黄淮水环境与污染防治教育部重点实验室,河南省环境污染控制重点实验室,新乡 453007

• 摘要：采用沉积物再悬浮模拟装置进行了再悬浮过程中多环芳烃(PAHs)的释放动力学实验,研究了长江水系武汉段7种沉积物中PAHs的释放动力学特征,并考察了沉积物组成对PAHs释放动力学的影响.结果表明,不同剪应力作用下的沉积物再悬浮过程中,不同性质沉积物中PAHs向上覆水体的释放均符合一级动力学方程,且释放过程分为两个阶段,第1阶段的释放速率大于第2阶段的释放速率,2~3环PAHs的释放速率大于4环PAHs;0.5 N·m^-2剪应力作用下PAHs的释放速率大于0.2 N·m^-2下的释放速率,且对于2~3环PAHs的影响更明显;不同性质沉积物再悬浮过程中,PAHs的释放速率与沉积物的组成特征无显著的相关性.

• Abstract：Release kinetics of PAHs during the resuspension of sediment samples at Wuhan section of Yangtze River were determined using a particle entrainment simulator (PES). The relationship between the sediment composition and release characteristics of PAHs was also investigated. The results showed that release of PAHs into overlying water during sediment resuspension followed first-order reaction kinetics. The release rate constants for the initial phase (0~1 h) were greater than those for the second phase (1~12 h) and the release rate constants of 2~3-ring PAHs were greater than those of 4-ring PAHs. The release rates of PAHs increased with the increasing shear stress. The release rate constants of PAHs under 0.5 N·m^-2 were greater than those under 0.2 N·m^-2. Resuspension energy had larger effect on the release of 2~3-ring PAHs. There was no significant correlation between release rate constants and sediment compositional characteristics.

• Key words：Polycyclic aromatic hydrocarbons  Yangtze River  Sediment resuspension  Release kinetics  Particle entrainment simulator

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