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《Research of Environmental Sciences》 2010-12
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Research on Sediment Oxygen Demand and Related Factors for Strong Reductive Sediments in Urban Rivers

MA Xiao-lei1,2,XU Ji-rong1,3,ZHANG De-min2,GAO Hua-sheng1,CHEN He-ping1 1.Faculty of Architectural Civil Engineering and Environment,Ningbo University,Ningbo 315211,China 2.College of Life Science and Biotechnology,Ningbo University,Ningbo 315211,China 3.South China Sea Institute of Oceanography,Chinese Academy of Sciences,Guangzhou 510301,China  
Water and sediment samples were collected from urban rivers of four different pollution levels in the city of Ningbo during July to August,2009.SOD(sediment oxygen demand) for each sample was tested using a homemade SOD device equipped with multi-electrodes and tubes.Water quality and physical-chemical index of the sediments from all stations were also analyzed.The SOD per area unit were between 13.8 mg /(m2.h) and 9.4 × 104 mg /(m2.h),and SOD per mass unit was 87.0 mg /(kg.h) in Station 2(ST2).It was clearly shown that there was a significant correlation between water temperature and the concentration of ammonia nitrogen in the sediment with SOD.However,there was no significant correlation between organic matter,DO(dissolved oxygen) and CODin in bottom-layer water with SOD.It was found that sediments from apparently heavily polluted stations appeared to have a strong "instantaneous oxygen consumption"phenomenon,which might be one of the main factors causing anoxia in the waters.
【Fund】: 国家自然科学基金项目(40676073)
【CateGory Index】: X522
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