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Phosphorus release potential and pollution characteristics of sediment in downstream Nansi Lake, China |
Zhijian LI1,2, Qinyan YUE1(), Baoyu GAO1, Yanwen WANG1, Qing LIU3 |
1. Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan 250100, China; 2. School of Light Chemistry and Environment Engineering, Shandong Polytechnic University, Jinan 250353, China; 3. Weishan Environment Protection Bureau, Weishan 277600, China |
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Abstract The research aimed to evaluate present and potential phosphorous pollution due to high sedimentary phosphorus load and release from sediment, when external phosphorus was reduced in downstream Nansi Lake. Pollution load of the sediment and overlying water was investigated. Kinetics and isotherms of adsorption/release of sedimentary phosphorus were studied to determine equilibrium phosphate concentration (EPC0) and release potential. Kinetics of phosphorus adsorption on sediment and release from sediment were well described by both the pseudo-first-order rate equation and the pseudo-second-order rate equation, but more appropriate to the pseudo-second-order rate equation with the adsorption/release capacity more close to the measured values, suggesting that the processes were chemically rate controlled and dependent on adsorption capacity. Soluble reactive phosphorus (SRP) sorption isotherms on sediment were best fitted by the modified Langmuir model indicating a monolayer adsorption. By comparing EPC0 and SRP of water, the status (adsorption, releasing or in equilibrium) of sediment phosphorus could be determined. The sediments at site S1, S3, S4, S5, and S7 where the EPC0s were greater than the SRPs, had a potential to release phosphorus into the water column. However, those sediments at S9, S10, and S12, where the EPC0s were approximately equal to the SRPs, were in impermanent equilibrium with overlying water in status of phosphorus, the sediments can be likely to release phosphorus to the water column once the equilibrium was broken. Therefore, sedimentary phosphorus can be a secondary pollution source in downstream Nansi Lake.
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Keywords
Nansi Lake
sediment
phosphorus
release potential
equilibrium phosphate concentration
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Corresponding Author(s):
YUE Qinyan,Email:qyyue@sdu.edu.cn, marine1001@gmail.com
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Issue Date: 01 April 2012
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