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《Geochimica》 2006-06
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Effect of submerged plant Hydrilla verticillata on sorption kinetics of phosphate in sediments

WANG Sheng-rui1, JIN Xiang-can1, ZHAO Hai-chao2, CUI Zhe3, YAN Chang-zhou1,BU Qing-yun1, CHU Jian-zhou3 and ZHOU Xiao-ning1 1.State Environmental Protection Key Laboratory for Lake Pollution Control, Research Center of Lake Eco-environment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China;2.College of Agronomy, Inner Mongolia Agricultural University, Huhhot 010018, China;3.College of Resources and Environmental Sciences, Agricultural University of Hebei, Baoding 071001, China  
The effects of submerged plant Hydrilla verticillata on the fitting of the sorption kinetics and the sorption rate of phosphate in sediments were investigated in simulating condition through the sorption kinetic experiments.The mechanism of the effects of submerged plant Hydrilla verticillata on the sorption kinetics of phosphate in sediments were also discussed from the point of concentrations of organic matter and Fe, Al oxides.The primary conclusions are as follows.(1)Although the results of the First Order mode was the most significant from the point of model fitting, it could not explain the effects of submerged plant Hydrilla verticillata on the sorption kinetics of phosphate actually.The other three models could do it, and among them the Parabolic Diffusion model is the best, and the other two models are between the above two.The existing of submerged plant Hydrilla verticillata could not affect this trend.(2)The sorption strength and sorption rate of phosphate on sediment, especially the sorption rate within 0.5 h are improved by planting submerged plant Hydrilla verticillata.The contents of organic matter and Fe, Al oxides of sediment are affected by submerged plant, which is one of the important mechanisms of enhancing its ability of phosphate sorption.
【Fund】: 国家重点基础研究发展计划项目(2002CB412304)
【CateGory Index】: X52
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