| 苏州城市河道底泥对磷酸盐的吸附与释放特征 |
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| 引用本文： | 冯海艳,李文霞,杨忠芳,阮晓红,刑雅囡.苏州城市河道底泥对磷酸盐的吸附与释放特征[J].地学前缘,2006,13(1):113-118. |
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| 作者姓名： | 冯海艳 李文霞 杨忠芳 阮晓红 刑雅囡 |
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| 作者单位： | 1. 中国地质大学(北京)地球科学与资源学院,北京,100083
2. 河海大学,环境科学与工程学院,南京,210098 |
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| 摘 要： | 为了探讨苏州古城区河道底泥对磷酸盐的吸附-释放特征,文中分别从改变上覆水的pH值、底泥吸附-释放动力学和等温吸附实验三个方面进行了研究。结果表明:(1)随着上覆水pH值的增大,苏州河道底泥对磷的吸附量逐渐减小;(2)底泥对磷的吸附过程是一个复合动力学过程,通常包括快吸附和慢吸附两个过程。底泥对磷的快速吸附在2h内快速进行,之后为慢吸附过程,到6h左右,基本达到一种动态吸附平衡;底泥对磷释放的动力学过程也包括快释放和慢释放过程。底泥释放磷在1·5h内快速进行,之后进入慢释放过程,磷酸盐含量基本稳定,达到释放平衡;(3)底泥具有较大的吸附磷的能力。随着上覆水的磷酸盐浓度增高,底泥吸附磷酸盐的量也增加。上覆水与底泥的比值越大,底泥对磷的吸附率越小。
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| 关 键 词： | 磷酸盐 底泥 吸附 释放 |
| 文章编号： | 1005-2321（2006）01-0113-06 |
| 收稿时间： | 2005-10-09 |
| 修稿时间： | 2005-11-21 |
Characteristics of adsorption and desorption of phosphate by sediments in the Suzhou River, East China |
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| FENG Hai-yan,LI Wen-xia,YANG Zhong-fang,RUAN Xiao-hong,XING Ya-nan.Characteristics of adsorption and desorption of phosphate by sediments in the Suzhou River, East China[J].Earth Science Frontiers,2006,13(1):113-118. |
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| Authors: | FENG Hai-yan LI Wen-xia YANG Zhong-fang RUAN Xiao-hong XING Ya-nan |
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| Institution: | 1. School of Earth Science and Resources, China University of Geosciences , Beij ing 100083, China; 2. College of Environmental Science and Engineering, Hohai University, Nanjing 210098 ,China |
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| Abstract: | The characteristics of adsorption and desorption of phosphate by sediments in the Suzhou River, East China are investigated. These include the effect of pH of overlying water on adsorption, adsorption and desorption kinetics, and isothermal adsorption. The results are as follows: (1) With an increase of the pH value of the overlying water, the adsorption capacity of phosphate in sediment decreases. (2) The kinetics of phosphate adsorption and desorption exhibit a complex behaviour, including a fast and a slow adsorption and desorption process. The fast phosphate adsorption process lasts 2 hours, then the slow process lasts about 6 hours before reaching the adsorption equilibrium. The fast phosphate desorption process occurs within 1.5 hours, then the slow phosphate desorption process takes place, and the desorption equilibrium reaches a relatively stable concentration of PO4-P. (3) The sediment has a strong phosphate adsorption ability. With an increase of PO4-P concentration, the PO4-P adsorption capacity on sediment increases. The higher the proportion of water to sediment, the lower the phosphate absorption capacity on sediment would be. |
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| Keywords: | phosphate sediment adsorption desorption |
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