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sediment pollution and its effect on fish through food chain in the Yangtze River

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International Journal of sediment Research 2008年第4期23卷 338-347页

作者： Yujun YI 1,Zhaoyin WANG 2,Kang ZHANG 3,Guoan YU 4,and Xuehua DUAN 51 Dr.,Lecturer,State Key Laboratory of Hydroscience,School of Environment,Beijing Normal University,Beijing 100875,China2 Prof.,State Key Laboratory of Hydroscience and Engineering,Tsinghua University,Beijing 100084,China 3 Ph.D.,State Key Laboratory of Hydroscience and Engineering,Tsinghua University,Beijing 100084,China 4 Ph.D.,State Key Laboratory of Hydroscience and Engineering,Tsinghua University,Beijing 100084,China 5 Ph.D.,State Key Laboratory of Hydroscience and Engineering,Tsinghua University,Beijing,100084,China Dr. Lecturer State Key Laboratory of Hydroscience School of Environment Beijing Normal University Beijing 100875 China Prof. State Key Laboratory of Hydroscience and Engineering Tsinghua University Beijing 100084 China Ph. D. State Key Laboratory of Hydroscience and Engineering Tsinghua University Beijing 100084 China Ph. D. State Key Laboratory of Hydroscience and Engineering Tsinghua University Beijing 100084 China

Suspended sediment adsorbs pollutants from flowing water in rivers and deposits onto the bed. However, the pollutants accumulated in the river bed sediment may affect the bio-community through food chain for a long period of time. To study the problem the concentration of heavy metals (Cr, Cd, Hg, Cu, Fe, Zn, Pb and As) in water, sediment, and fish/invertebrate were investigated in the middle and lower reaches of the Yangtze River during 2006-2007. The concentrations of heavy metals were 100-10,000 times higher in the sediment than in the water. Benthic invertebrates had relatively high concentrations of heavy metals in their tissues due to their proximity to contaminated sediments. Benthic invertivore fish had moderately high concentrations of heavy metals whereas phytoplanktivore fish, such as the silver carp, accumulated the lowest concentration of heavy metals. The concentrations of Cu, Zn, and Fe were higher than Hg, Pb, Cd, Cr, and As in the tissue samples. The concentration of heavy metals was lower in the river sediments than in the lake sediments. Conversely, the concentration of heavy metals was higher in river water than in lake water. While a pollution event into a water body is often transitory, the effects of the pollutants may be long-lived due to their tendency to be absorbed in the sediments and then released into the food chain. The heavy metals were concentrated in the following order: bottom material > demersal fish and benthic fauna > middle-lower layer fish > upper-middle layer fish > water.

关键词： sediment pollution Heavy metal Fish Invertebrate Yangtze River

A long-term record of land use change impacts on sediments in Oualidia lagoon,Morocco

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International Journal of sediment Research 2014年第1期29卷 1-10页

作者： Mehdi MAANAN Ana Carolina RUIZ-FERNNDEZ Mohamed MAANAN Paul FATTAL Bendahhou ZOURARAH Mohamed SAHABI Géolittomer UMR 6554 LETG Université de Nantes Marine Geosciences Laboratory URAC 45Earth Sciences departmentFaculty of Sciences Universidad Nacional Autónoma de México.Instituto de Ciencias del Mary Limnología

An integrated approach,involving land use patterns and heavy metal contents of the surficial and cored sediment,was proposed to detect the characteristic spatial and temporal scale of point and non-point source human disturbances on the Oualidia lagoon in *** and description of the temporal and spatial distributions of the main contamination sources of heavy metals are analyzed using statistics and GIS *** results show that surficial sediments are highly enriched in heavy metals compared to their preindustrial background ***-use types affected lagoon sediment pollution in different ways:1) agricultural areas had the highest potential for sediment contamination by heavy metals,particularly Pb,Cu and Hg,2) Ni and Cr are the main pollutants originating from urban sewage and 3) oyster farming and traditional land uses such as salt flats,pastures showed low levels of others *** enrichment factors(normalized by Al) obtained from the sediment cores indicated that the lagoon is(strongly/moderately) polluted by all metals which were attributed to agricultural activities and wastewater discharges from urbanized areas.

关键词： Land use change(LUC) Geographical information systems(GIS) sediment pollution Risk assessment

Fractionation of heavy metals in shallow marine sediments from Jinzhou Bay,China

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Journal of Environmental Sciences 2010年第1期22卷 23-31页

作者： Shaofeng Wang, Yongfeng Jia, Shuying Wang, Xin Wang, He Wang, Zhixi Zhao, Bingzhu LiuKey Laboratory of pollution Ecology and Environmental Engineering, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China. Key Laboratory of pollution Ecology and Environmental Engineering Institute of Applied Ecology Chinese Academy of Sciences Shenyang 110016 China

This work investigated the distribution and speciation of Cd, Cu, Pb, Fe and Mn in the shallow sediments of Jinzhou Bay, Northeast China, which has been heavily contaminated by nonferrous smelting activities. The concentrations of Cd, Cu and Pb in sediments were found to be 100, 13 and 7 times, respectively, being higher than the national guideline （GB 18668-2002）. Sequential extraction test showed that 39%-61% of Cd were exchangeable fractions, indicating that Cd in the sediments posed a high risk to local environments. While Cu and Pb were at moderate risk levels. According to the relationships between percentage of metal speciation and total metal concentration, it was concluded that the distributions of Cd, Cu and Pb in some geochemical fractions were dynamic in the process of pollutants migration and the stability of metals in sediments of Jinzhou Bay decreased in the order of Pb 〉 Cu 〉 Cd.

关键词： heavy metals sediment pollution fractionation Jinzhou Bay risk assessment

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The settling of resuspended lake sediment related to physicochemical properties of particles of different sizes: Implication for environmental remediation

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International Journal of sediment Research 2021年第4期36卷 542-554页

作者： Zhao Wei Youze Xu Yanyan Zhao Yuanyuan Zhao Leilei Bai Helong Jiang Changhui Wang State Key Laboratory of Lake Science and Environment Nanjing Institute of Geography and Limnology Chinese Academy of Sciences Graduate University of Chinese Academy of Sciences Key Laboratory of Water pollution Control Technology Hunan Research Academy of Environmental Sciences

sediment resuspension is an important way for shallow lake internal pollution to interact with the overlying water column,and the pollution risks are reasonably related to the retention of resuspended sediment particles in overlying *** the current study,the settling of resuspended sediment particles was comprehensively investigated under different disturbances using five urban lake *** results show that the particle size distributions of resuspended sediment from different lakes exhibited similar variations during settling with disturbance,although varied settling times were observed under static *** settling with and without disturbance,sediment particle sizes were mainly within 8-63 μm at the initial stage,and were sediment particle size was divided into sand(> 63 μm),silt(8-63 μm),and very fine silt and clay(sediment settling for different particle sizes could be well described by the first-and second-order kinetic equations,especially when settling was disturbed(r~2=0.727-0.999).The retention of resuspended sediment could be enhanced as particle sizes decreased and disturbance intensities ***,a water elutriation method was successfully optimized,with separation efficiencies of 56.1%-83%,to separate sediment particles into the defined three particle size *** chemical compositions of sediment were found to change with different particle ***,calcium tended to form large-size sediment,while the total contents of aluminum,iron,magnesium,and manganese showed significantly negative correlations with sediment particle sizes(p sediment particle size related settling dynamics and physicochemical properties suggested the necessity on determining the pollution of resuspended sediment at different p

关键词： sediment settling Particle size distribution Physicochemical properties sediment pollution

Relationship of Morpho-sedimentological Variations to the Fate of Hg-and Zn-Polluted sediments in the Contaminated Site of Porto Marghera,Lagoon of Venice,Italy

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Journal of Environmental Protection 2013年第4期4卷 37-49页

作者： Emanuela Molinaroli Alessandro Sarretta Jorge Ade Souza Guimaraes Margherita Botter Daniele Cassin Stefano Guerzoni Dipartimento di Scienze Ambientali Informatica e Statistica Universita Ca’Foscari VeneziaVeneziaItaly CNR—Consiglio Nazionale delle Ricerche ISMAR—Istituto di Scienze MarineBolognaItaly Coastal Planning&Engineering do Brasil Santo Antonio de LisboaFlorianopolisBrasil CNR—Consiglio Nazionale delle Ricerche ISMAR—Istituto di Scienze MarineVeneziaItaly CNR—Consiglio Nazionale delle Ricerche ISMAR—Istituto di Scienze MarineLesinaItaly

New data collected from twenty-six sites during 2008 inthe contaminated Site of National Interest (SIN) of Porto Marghera within the Lagoon of Venice (Italy), which has been affected by the presence of an industrial zone for the last 80 years, were compared with data from a campaign performed in the same site 30 years before (1976-1978). The SIN was found to be heavily polluted in the earlier study, and several tons of Hg and Zn are still stored in soils and industrial channel sediments, potentially affecting the lagoon part of the SIN. Bathymetric variations, grain-size, Hg and Zn content in sediments were analysed. The severe contamination of the late 1970s (Hg 1.7 μg/g;Zn 754 μg/g) had fallen by the late 2000s (Hg 0.9 μg/g;Zn 225 μg/g). The fall in Hg and Zn contamination over the 30-year period was mainly linked to the patterns of geomorphological change inside the SIN that affected two distinct sub-areas: 1) a stable-depositional (SD) area in the Northern part, which exerted a “dilution” effect on contaminants, with significant deposition (~11%) of coarse-grained sediments (63 - 8 μm), and 2) an area characterised by moderate-to-severe-erosion (MSE) to the South, which saw the loss (~13%) of pollutant-bearing fine-grained sediments (sion if hydrodynamic conditions change in the future. This study provides useful support to decision-making systems by helping to select hot-spots for remediation measures.

关键词： Lagoon of Venice sediment pollution Bathymetry Erosion-sedimentation Grain-Size Management Plan