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Heavy Metals Bioavailability on Sediments of the Baotou Section of the Yellow River

Author: FanQingYun
Tutor: HeJiang
School: Inner Mongolia University
Course: Ecology
Keywords: Heavy metal Bioavailability Sediment Exposure experiment Yellow River
CLC: X522
Type: PhD thesis
Year: 2008
Downloads: 502
Quote: 4
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Abstract


Natural water body is one of the main ecosystems of heavy-metal contamination the water sediments contaminated by heavy metals has been hailed as a \The economic development of the basin is the current trend of development, environmental issues have become a \The process of urbanization and industrialization exacerbated the crisis of human living environment, almost all rivers, lakes and oceans are suffering from various degrees of pollution, and the world of heavy metals as an important indicator of water quality monitoring and evaluation. Baotou City is a typical heavy industrial city along the Yellow River Basin, and industrial waste water in the city is typical and representative of the Yellow River water weight metal pollution. Previous studies have shown that the morphological analysis of the potential hazards of heavy metal pollution in the sediments of the the bioaccessibility basis for identifying the premise. Natural water body is a complex system containing a variety of ions, to carry out multi-ions coexistence system in line with the actual situation of the natural water body in the competitive adsorption of heavy metals in natural sediment dynamics and competitive adsorption on heavy metals into the research reveals the heavy metal pollution mechanism more practical significance. The micro-ecosystem the exposed experiment and AVS method, combined with the concentration of heavy metals in the pore water, to determine the bioavailability of the Yellow River water weight metal integrated system solutions contribute to the research questions. Proceed from the mechanism and the effects of heavy metal pollution of the Yellow River water to explore the relationship between the Yellow River sediment heavy metal fraction distribution and bioavailability and toxicity of heavy metals in the migration and transformation of waters of the Yellow River, revealing, and predict the bioavailability and toxicity of heavy metals in the Yellow River sediment , identifies the potential hazards of heavy metal pollution in the Yellow River sediments, not only for the Baotou section of the Yellow River water weight metal pollution prevention countermeasures and scientific basis, as well as to protect the water quality of the Yellow River and the city industrial wastewater rivers provide reference for the study of heavy metal pollution. In this study, environmental geochemistry, biogeochemistry, pollution ecology and modern sedimentology theory and method to heavy metal geochemical characteristics and bioavailability of the main line, respectively in 2004 and 2005 by the blight, HSBC level three water-phase system acquisition Baotou section of the Yellow River dry tributary of the nine sections of the overlying water, pore water, suspended solids and sediment cores from samples captured Baotou section of the Yellow natural fish samples, a total of 17,287 laboratory tests data. Depth multi-ion system in line with the Yellow actual competitive adsorption and migration and transformation mechanisms, water pollution characteristics of heavy metals, heavy metals in the water - sediment. Fish microecosystem response relationship as well as the wild economic fish heavy metals rich heavy metal set of laws. The exposure experiment study conducted for the first time receiving a large number of urban industrial wastewater Baotou section of the Yellow River the fish microecological system, biogeochemical cycles and ecological risk assessment has accumulated a large amount of basic data for the heavy metal bioavailability. In addition, in view of the South China Sea, Lake and the Yellow deposition homology and inheritance, to carry out the Environmental geochemistry of heavy metals in the sediments of the lake water of the South China Sea. In this study achieved the following major achievements and progress. For the first time to carry out the Yellow River in the fish microecological system exposure experiment, identifies the water - sediment system and heavy metals in fish response relationship, building a penalty of knowledge of toxic metals in the water environment of heavy metals in fish tissues and organs provide a new effective way to draw on the regression model, the relationship between the biological monitoring of heavy metal pollution. The first comprehensive evaluation of the degree of pollution of Baotou section of the Yellow fish the obtained Harengula sub> carp> flower fish bones amblycephala> stick flower fish> Yellow River carp> Squaliobarbus> perch Sleeper> The snake Squalidus sequence of heavy metal pollution levels. Innovation fish sediment sub-form of enrichment factor concept expanded pollutants Bioconcentration Mechanism of ideas. Found that the specific laws of the dry season, the Yellow River sediments as a source of heavy metal sinks, wet period. Sediment Quality Criteria for Metals, identifies the potential risk of the Yellow River sediments. The study reveals that the Baotou City industrial wastewater discharge an important contribution to the superposition of the pollution of the Yellow River in weight metal. The experimental Pb 2 > Cu 2 >> Zn 2 > Cd 2 competitive adsorption sequence and Cd> Zn> Cu> Pb ability to release sequence. The research is of great significance in revealing the mechanisms of migration and transformation of heavy metals in the water - sediment system. The study confirmed that the South China Sea, Lake and Yellow River has significant deposition of homology and inheritance. Surface sediment pore water Cu and Cd, particularly Cu characteristics of the overlying water from interstitial water diffusion and migration significantly. The important bridge channel sediment pore water from the heavy metals from sediments overlying water upward migration process. The general freshwater lakes, the vertical distribution of AVS in the sediments of the South China Sea Lake maxima Down maxima phenomenon. AVS is a key factor to control the Nanhai Lake Heavy Metal precipitation, organic complexing agent is a dominant factor promoting Cu diffusion and migration to the aqueous phase. 6 introduces the concept of the effect of heavy metal species distribution space, space effect theory to explain the transformation of the water quality in the South China Sea Lake Cu pollution and water of the Yellow River sediments heavy metal source / sink function mechanism.

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CLC: > Environmental science, safety science > Environmental pollution and its prevention > Water pollution and its control > River
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