| 其他摘要 | The soil as an important natural resources is related to survival and human development, and is also one of the important elements of the ecological environment. With the rapid development of economic, the problems between resource and environmental are increasingly prominent, a variety of environmental problems have emerged. Which the PAHs (polycyclic aromatic hydrocarbons) of organic contaminants is widespread and difficultly biodegradable in the natural environment. Because of high detection rate of hydrophobic organic pollutants and polycyclic aromatic hydrocarbon pollutants in natural environment, and the higher concentration of the ecological environment, PAHs constitutes a potential threat to the safety and human health of agricultural products. Karst is the largest and the most basic situation in the province of Guizhou. The study of Karst soil organic pollutants has practical significance ,especially，the relationship of soil organic matter and mineral components which has important implications for soil has been a focus in the field of soil science and the environment. Soil organic matter as an important part of soil and functional units, including humciacids(HA), fulvicacids(FA) and humin. Soil organic matter is a major component of soil adsorption of organic contaminants , which has an important influence for distribution and migration of organic pollutants in the natural environment . One of the important migration and transformation of hydrophobic organic compounds is the adsorption of polycyclic aromatic hydrocarbons analytical role in soil and sediment behavior in the environment . Actually, the result of joint action between the organic matter, minerals and complex is soil adsorption and desorption of organic pollutants. Adsorption of organic pollutants / desorption properties of soil properties can react a certain natural environment. So by studying the distribution of organic pollutants in the law and characteristics of these components , we can get a meaningful Conclusion between soil and organic pollutants . This article is based on the soil of Karst region , yellow soil (HRT), calcareous soil (SHT) and purple soil (ZST) selected to the research object , By establishing the model of organic pollutants in the laboratory, in case of adsorption / desorption .soil samples including original , water treatment simulation test soil samples and conduct acid soil samples Through the establishment of different concentrations of organic pollutants in the observation of adsorption analytical laboratory tests to obtain the Karst soil under different treatment of phenanthrene adsorption / desorption isotherm data.Indirectly reflect the chemical speciation of karst soil organic matter , preliminary inquiry the initial relative position and explore the relationship between soil organic matter and soil minerals. And put forward the research problems and the future direction of development. The major findings of this study are as following: 1. Based on the three kinds of soils selected, enhanced adsorption phenomenon of the acid-treated samples were not observed significantly after acid treatment, the self-protection mechanisms of soil organic matter under karst parcels is the formation of Ca+ humic acid calcium but not by calcium carbonate, 2. Karst soils covered in different terms of forest, the adsorption hysteresis organic pollutants more exist in the yellow loam and limestone soil covered by forest, and far below the low vegetation cover soil, we can explain that it’s the same grade in terms of three soils lime yellow loam soil with organic matter contained, Obviously, it is not the same with the grade of purple soil organic matter, the possibility of higher organic matter exist. |
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