| 长江口沉积物对磷酸盐吸附的等温模型 |
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| 引用本文： | 李敏,王光谦,倪晋仁,韦鹤平.长江口沉积物对磷酸盐吸附的等温模型[J].清华大学学报(自然科学版),2005(9). |
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| 作者姓名： | 李敏 王光谦 倪晋仁 韦鹤平 |
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| 作者单位： | 清华大学水利水电工程系水沙科学教育部重点实验室 北京100084
(李敏，王光谦)，北京大学环境工程系 北京100871
(倪晋仁)，同济大学环境科学与工程学院污染控制与资源化国家重点实验室 上海200092(韦鹤平) |
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| 基金项目： | 国家“九七三”重点基础研究项目(2003CB415206) |
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| 摘 要： | 采用恒温摇床振荡吸附法研究了长江口水域几个污水排放口附近悬浮沉积物对磷酸盐的吸附等温模型。结果表明,L angm u ir吸附等温模型适用于描述细颗粒含量较高的沉积物对磷酸盐的吸附;细颗粒含量低的沉积物对磷酸盐的等温吸附数据则符合指数形式,理论分析表明,这是由于水相磷酸盐浓度较高时,HPO42-与海水中的C a2 离子生成C aHPO4沉淀引起沉积物的表观吸附量增加所致。
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| 关 键 词： | 沉积物 长江口 磷酸盐 吸附等温模型 |
Adsorption isotherm model of phosphate by suspended sediments from Changjiang Estuary |
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| LI Min,WANG Guangqian,NI Jinren,WEI Heping.Adsorption isotherm model of phosphate by suspended sediments from Changjiang Estuary[J].Journal of Tsinghua University(Science and Technology),2005(9). |
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| Authors: | LI Min WANG Guangqian NI Jinren WEI Heping |
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| Institution: | LI Min~1,WANG Guangqian~1,NI Jinren~2,WEI Heping~3 |
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| Abstract: | Adsorption experiments using a shaking table at constant temperature were used to study the adsorption of phosphate by suspended sediments from outfalls in the Changjiang Estuary. The results show that the adsorption in sediments with a high content of fine particles fit the Langmuir model better than the Freundlich and Temkin model while the exponential equation is useful for interpreting the adsorption on sediments with a low content of fine particles. According to an analysis based on precipitation theory, the exponent isotherm model of some sediment samples are caused by the precipitation of CaHPO_4 from Ca~(2 and HPO~~(2-__4 for high phosphate concentration in the liquid phase. |
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| Keywords: | sediment Changjiang Estuary phosphate adsorption isotherm model |
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