Monitoring Of Atmospheric Deposition And Source Analysis Of Pollutants In Anqing City

The atmosphere is called the third environment of human beings as protection umbrella of the earth.Atmospheric environment influenced the life of human beings.The quality of the atmosphere environment directly affects the production and life of human beings.The issue of the atmosphere environment has been paid more and more attention by the government and the society.Affected by human activities,all kinds of gaseous,liquid,and solid contaminants in the air by atmospheric precipitation and reach the surface dust,affect human health,pollution of surface water,soil,endangering ecological system stability and security,therefore,monitoring atmospheric precipitation and analysis pollution source can analyze the atmospheric environmental quality,reveal atmospheric environmental problems,To provide data and practical support for winning the battle to protect the blue sky in the region.Anqing is located in the southwest of Anhui Province and the north bank of the Yangtze River.Anqing is also an important node city in the regional integration construction of the Yangtze River Delta.The industry is dominated by new energy vehicles,new chemical materials,high-end equipment manufacturing,energy conservation and environmental protection,biomedicine,textile and clothing,etc.The factory and city are integrated,and the air environment control has a long way to go.At the symposium on regional integration in the Yangtze River Delta held in Anhui Province,General Secretary Xi Jinping proposed that protection and restoration of the ecological environment of the Yangtze River should be given a prominent position,and serious efforts should be made to rectify prominent ecological and environmental problems,so as to consolidate the foundation for green development in the Yangtze River Delta region.As a whole the Yangtze river delta regional ecological environment protection cooperation mechanism,coordination promote regional ecological zone from spreading,anqing city problems facing serious challenges for the control of air pollution,based on this,this study in anqing city set up three atmospheric precipitation sampling points,seven atmospheric dust sampling points,collected precipitation and dustfall samples from January 2019 to December 2020.Through the analysis of precipitation sample composition,the spatial and temporal variation characteristics of precipitation composition were revealed.The transport trajectory and potential source area of atmospheric particulate matter were analyzed by using the HYSPLIT backward trajectory model.Based on the Sr-Nd-Pb isotope tracer system,the source of dust fall in Anqing City was studied,the main findings are as follows:（1）In the precipitation of Anqing,the main cations are NH₄⁺and Ca²⁺,and the main anions are SO₄^2-and NO₃^-.（2）The spatial and temporal variation of precipitation components in Anqing city is obvious.The ion concentration is high in winter and spring and low in summer and autumn.In space,it is high in the southwest and low in the northeast.The frequency and intensity of acid rain decreased significantly with time.（3）The transport trajectory of pollutants in spring,summer,autumn and winter in Anqing showed obvious seasonal changes.In summer,it is mainly affected by the airflow from the South China Sea and the East China Sea,and the air quality is good,and the corresponding average PM₁₀ and PM_2.5 concentrations are low.In winter,spring and autumn,the average concentrations of PM₁₀ and PM_2.5 were relatively high due to the combined action of continental airflow and oceanic airflow over the northeast path.（4）The distribution and change of PSCF and CWT of PM₁₀ and PM_2.5 in Anqing were similar.The PSFC and CWT values were the largest in winter and the smallest in summer.The two high values of PSFC and CWT were mainly distributed in the belt areas around Anqing,such as the eastern part of Hubei,the northern part of Jiangxi and the southern part of Hunan,and the belt areas along the Yangtze River in Anhui and Jiangsu,and the northern part of Zhejiang.（5）The main influencing factor of dust fall is the disturbance of human life and production activities.The contribution rate of human Pb ranged from 54.3%to 65.0%.The variation range of ²⁰⁶Pb/²⁰⁷Pb is 1.1259～1.1647,and the variation range of208Pb/207Pb is 2.4280～2.4555,The range of⁸⁷Sr/⁸⁶Sr is 0.7090～0.7102 andεNd（0）is-13.41～-12.24,indicating the nearness of dust fall.