Monitoring And Prediction Of Heavy Metals In Multimedium Of Urumqi And Changji Cities

In recent years,with the rapid implementation of the western development strategy,Urumqi,Changji area,urbanization,industrialization also continue to develop,various c sources of input,the interference of human factors,heavy metals in city environment pollution is becoming more and more serious.However,the monitoring of heavy metals in the urban environment of Urumqi and Changji is still weak,and lack of effective monitoring data,especially for the monitoring of heavy metals in different environmental media.Monitoring and testing method of the existing heavy metals is relatively time-consuming and labor-consuming and not convenient.However,the use of the model to simulate and predict the concentration distribution of pollutants in various environmental media has become the most effective technical tactic,and can greatly reduce the workload.Based on this,this paper takes Urumqi city and Changji city as the study area,to monitor the contaminated situation of heavy metal in various environmental media function area in Urumqi,and set up conventional sampling points in Changji to monitor the pollution situation of heavy metal in Changji of ambient particulate of PM2.5,PM1.Analysis of changes of heavy metals in seasonal and diurnal variation in PM2.5,evaluate health risk of heavy metals in PM1.This paper finally establishes the multimedia equivalent concentration model simulation analysis on distribution of migration of heavy metals in the environment,and to predict the quality level of the concentration of heavy metals in different environmental media,in order to provide methods and technical support for the city environmental monitoring of heavy metals.The main conclusions are as follows:(1)Through the monitoring of heavy metals in different functional areas of Urumqi.Cu,Zn,Cd and Pb have different degrees of pollution in various environmental media.Zn,Cd and Pb are mainly accumulated in the particulate phase with atmospheric and impermeable layers,while Cu is mainly accumulated in the atmosphere and soil.From the different functional areas,the four heavy metals in traffic areas,industrial areas and commercial areas are serious pollution,residential areas and cultural and educational areas are polluted lightly.Regional differences in the source of emissions is the main reason.(2)Through one-year monitoring of heavy metals in atmospheric particulates in Changji.The result shows that the overall performance of concentration of PM2.5 in Changji is winter > spring > autumn > summer.In addition,the average concentration of heavy metals in PM2.5 also showed a significant seasonal variation,the overall concentration is the highest in winter,the second in spring,and the next in autumn and the lowest in summer.The diurnal variation of Cd in the four seasons is similar to that of Pb,and the diurnal variation of Cu is special.(3)Most of the heavy metals in PM1 in Changji are subject to certain human interference.Health risk assessment showed that the health risks of non-carcinogenic heavy metals were within the acceptable range,and the carcinogenic heavy metals As,Cr and Co had a greater risk of cancer,while Cd and Ni had less carcinogenic risk.The health risk of heavy metals showed that the children are higher thn the adults,the adult males is higher than the females.As,Cr and Co in PM1 would cause some loss of life expectancy.Life expectancy loss of the three heavy metals accumulate on adult men,adult women and children were 30.95 d,26.62 d,and 48.46 d,respectively.(4)Compared with the simulated values of heavy metals in different media,Cu and Zn have good agreement,and the simulation value of Cd and Pb is relatively effective and has some reference.However,part of the simulation process needs further improvement.Therefore,it is feasible to simulate the transport of heavy metals in urban multi interface and predict the concentration of heavy metals in urban environment by using the concentration model.