Characterization of phosphorus sorption on the sediments of Yangtze River Estuary and its adjacent areas |
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| Authors: | Xiaoyan Cao Xiaoyue Liu Jiamei Zhu Lisha Wang Sumei Liu Guipeng Yang |
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| Institution: | 1. Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education of China, China;2. Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, China;3. College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China |
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| Abstract: | This paper studied the kinetics, isotherm and thermodynamics of phosphorus sorption onto the sediments of the Yangtze River estuary and its adjacent waters, as well as the sediments' compositions and physicochemical properties. The process could be described well by a two-compartment first order equation. The sorbed phosphorus mainly consisted of Ex-P and Fe-P, with Ex-P being the dominant. The equilibrium isotherms could be fitted well with a modified Langmuir equation. The calculations of the thermodynamic parameters indicated that the process was spontaneous and exothermic. The CEC and the fractions of clay, calcite and organic matter were correlated with the sorption parameters, while the surface proton charge of the sediments was significantly negatively correlated with them. Considering the kinetics and phosphorus forms changes during the process, the sorption in our study could be considered that the physical process plays an important role. |
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| Keywords: | Phosphorus Fractions Sorption Isotherms Surface property |
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