Tianjin Geochemistry Of Heavy Metals In The Surface Water And Sediment

With the rapid growth of population, the acceleration of industrialization and urbanization, water pollution has become a global concern.2010State of the Environment data shows that surface water in China’s seven major river systems overall is lightly polluted, many lakes and reservoirs are eutrophicated. At the same time, Hebei has promulgated Regulations to reduce pollutant emissions, Henan has issued a Water Pollution Control Ordinance, Guizhou has developed major pollutants, the total emissions of the crucial work of administrative accountability and a series of decrees are issued to protect existing surface water resources.For the Tianjin area, water shortages and water pollution are both serious. Both the formation of the interaction and the vicious cycle had a great impact on industrial and agricultural production as well as living condition. However, researches on the problems are still relatively backward. Now we can not completely grasp the transformation processes of pollutants in surface water, the ability of self-purification of surface water bodies, as well as contaminants in the sediment enrichment and secondary pollution, which caused a series of related questions.Part of the same chemical properties, heavy metals due to the micro part of the similarity of the atomic structure of this thesis study Tianjin surface water dissolved and deposited the total amount of heavy metals, and forms of heavy metals content in stream sediments and to understand them rivers in Tianjin in Tianjin, the distribution of surface water dissolved and features, lakes and reservoirs and the distribution of characteristics of the total sewage in the river sediments, and various forms of content distribution law. And comparative analysis of on Tianjin rivers, lakes and reservoirs, and heavy metals in sewage river in various forms provides a viable scientific basis for hope that the water environment governance and decision-making.Tianjin, rivers, reservoirs, lakes and Sewage River, three surface water bodies, various forms of heavy metal, the following preliminary conclusions: Tianjin range of rivers, reservoirs are subject to different degrees of pollution, water complex environmental issues. Upstream freshwater resources closure, most of the year resulting in lower reaches of major rivers runoff supplement, and Tianjin part of the river during the rainy season in the drying state, shipping complete loss of function, a substantial decline in capacity and self-purification capacity of rivers and lakes River Water Environment upstream and the large number of sewage pollution increased, the majority of water quality indicators have been more than five types of water bodies, water function is declining.Tianjin surface2of this study of dissolved heavy metal content in addition to Yuqiao Reservoir is generally higher than the national secondary standard, and presents for the direction of the river into a positive correlation between the junctions-of the rivers, heavy metal pollutants are generally higher. The surface state of dissolved heavy metals and alkalinity were significantly related to the alkalinity of the higher body of water, heavy metal contamination is more serious.12rivers in Tianjin, the content of dissolved heavy metals exceeded the fishery water quality standard limits and irrigation water quality standards limits, is not suitable for fish farming and irrigation.The problem of pollution of surface water body is mainly concentrated in the border of the provinces and cities, especially in the region’s rivers River as the natural border of the provinces and cities, pollutants from upstream areas, showing the provinces and cities at the junction of serious pollution problem, but cleaning up wider issues involved.Found that the total depth is proportional to the dissolved heavy metals in lakes and reservoirs. The deeper the water depth, the higher the total amount of dissolved heavy metals.The totals of heavy metals in river sediments of the Haihe River are higher than those in the other basins, significantly higher than the background value of soil and stream sediment average exposure to polluted state. Multi-element evaluation of each sampling point in surface sediments, heavy metals, composite pollution:Cd> Hg> As> Zn> Pb> Cr> Cu. Total heavy metal content in the surface sediments of the confluence of the rivers Tianjin is relatively high, and with the direction of the river, the change of the total amount of heavy metals in surface sediments are relatively flat, heavy metal contamination in the sediments is not the case, but Tianjin’s overall surface water is very serious. In Tianjin rivers, lakes and reservoirs in the form of heavy metals in surface sediments of the sewage in the river as a whole are consistent. Heavy metals of As, Co, Cu, Zn in rivers, lakes, reservoirs, sewage are the residual fractions. The pollution caused by man is less serious.Mn acid dissolved the proportion of heavy metals in rivers, lakes and reservoirs Drainage River. Of Pb, the acid dissolved in surface sediments and reduced the proportion of sewage rivers> river lakes and reservoirs. Display Pb comes mainly from the outside source pollution-man-made pollution in surface sediments from the river surface sediments in the heavy metals Mn and Sewage River.