Chengdu Local Environment Of Heavy Metal Pollution Characteristics And Biological Validity Analysis

With the development of economy and the improvement of people's living standard, the city industry rapid development and the rising number of vehicles, the harmfulness of heavy metal pollution produced in imperceptible in permeate every tache in life. Heavy metal elements on the dangers of environmental produce includes many things, for example: the environmental behaviors, heavy metal migration capacity, heavy metal biological effectiveness, etc. These dangers not only depend on heavy metals in environment, and how much of the total depends largely on existing in the environment of heavy metal elements form. And heavy metal form, space and time factor by meteorological factors, natural geochemical factors, but also by the influence of human production activities, heavy metal elements in different forms into the urban environment, ecological system in different conditions in various environmental factors under the influence between migration, enrichment and transformation. Therefore pollution characters is more complicated. In this paper, with A set of Chengdu points east west, to set up two monitoring spot B collected the atmospheric particulate, water, soil and plants as A sample, determination and simulation soak test according to the method of combining the chemical speciation of heavy metals and amount of the study area analysis result, the heavy metals pollution situation, metal change shape characteristics, metal bioavailability systematically studied, the results of the study indicate that:Research area in total suspended particle, soil heavy metal pollution distribution characteristics, namely, a similar law of relatively serious, cadmium pollution of the concentration of the elements in soil over national secondary standard two times; In particulate concentrations more than in atmospheric environment quality level 4 standards. Second pollution is manganese, lead and zinc. Water pollution is a serious is lead and manganese, while the rain, these two kinds of heavy metal element content exceeded the national level 4 standards. Through the analysis of the sample that amount can be heavy metal cadmium, lead, manganese and zn pollution is ignored; Through the heavy metal elements variation coefficient research shows that cadmium, copper, mercury and chromium is affected by exogenous that heavy metal element in the study area by human factors effect pollution is very strong; Through the correlation between the heavy metal elements that, cadmium, copper, lead and zinc is taller, the correlation between the pollution source that the homology of their bigger.The study area speciation analysis of heavy metals in. Total suspended particulates by soaking speciation analysis before knowable, lead and manganese chemical form for: can exchange state > organic configuration and residual > carbonate and normal oxidation state; Copper and zinc chemical form for: machine configuration and residual state > exchange state > carbonate and oxidation state; Cadmium chemical form for: exchange state > carbonate and oxidation state > organic configuration and residual condition. Again through rivers water immersion particulate, different pH value of acid rain soaked particulate simulates that with pH value, test the increase of lead can exchange state decrease the proportion of zinc and cadmium, but each chemical form with pH percentage small changes. Under the condition of river water immersion in the total content of copper in particle has dropped slightly, lead total content has dropped slightly, but lead can exchange state content, the elements become less by not stable state turned to stable state, and greatly reduce the particles in the lead in river water toxic. And zinc carbonate and oxidation state but increases, organic configuration and residual mode content decreased, making the water environment of zinc toxic increase; Through the river water immersion soil morphology analysis can know, cadmium and manganese these metals can exchange state percentage is bigger, pollution the risk is very big, should be strictly controlled. Lead, copper and zinc present in most states, can exchange state residue and less pollution risk levels are relatively low.The study area validity analysis of heavy metals in biology. Total suspended particles from the single factor pollution index can be seen in the zinc and cadmium, lead, copper and manganese total suspended particles in the atmosphere there is pollution, but also by zinc and cadmium and lead the three most prominent performance of heavy metal elements. Its heavy metal element availability for the creatures sort: cadmium > manganese > lead > copper > zinc, migration coefficient sort: cadmium > manganese > lead > zinc > copper. Predictably cadmium and lead pollution is very serious; The single factor assessment from soil can know, all sampling points by zinc and cadmium soil all the serious pollution. From the biological available coefficient, migration coefficient analysis knowable cadmium, lead and manganese is higher. And the numerical copper in transfer coefficient is the biggest, followed cadmium, however not use state copper accounting for a large proportion of not using state, cadmium small proportion, so the dangers of cadmium is the greatest. Generally speaking, regional cadmium, lead and zinc, the pollution prevention and control should be taken seriously in the heavy metal pollution aspect to comprehensive consideration of the heavy metal amount and heavy metal element of the form, etc.