Temporal And Spatial Distribution Of Atmospheric Particle Concentration And Adsorption Mechanism Of Plant Leaf

To explore the concentration of atmospheric particulate matter in the functional areas of urban areas of Taiyuan City,Shanxi Province,the characteristics of temporal and spatial distribution of heavy metals attached to the morphology and particulate matter,this study selected three regions of Wuyi Square,Jin Ci Park and Taiyuan Normal University as the representative samples of three different functional areas in the traffic zone,leisure area and cultural and educational district,in the 2017 the two seasons of autumn and winter compare the of different functional areas PM10 and PM2.5 concentration,single particle morphology and heavy metal composition on the surface of particulate matter.At the same time,based on the study of the dust retention ability of plant leaves in Taiyuan City,the green plants with the best capability of dust retention in urban area are screened out.The research results show thatIn the different functional areas of Taiyuan city,the air pollution of wuyi square(traffic area)is the most serious,among which the average concentration of PM2.5 is 246.96 g/m3,jinci park is 162.98 g/m3,Taiyuan normal is 78.38 g/m3.The average concentration of PM10:wuyi square is 306.34 plus or minus 24.41 g/m3,jin ci park is 180.93 g/m3,Taiyuan normal is 83.38 plus or minus 13.38 g/m3.The pollution of PM10 and PM2.5 at different periods in the three functional areas is shown in the Taiyuan normal college in wuyi square.In wuyi square(traffic area),the concentration of large particles is significantly higher than those of the other two functional areas due to the large traffic flow and the emission of large amount of vehicle exhaust.The average daily concentration of PM10 and PM2.5 in the three functional areas was significantly higher in winter than in autumn.The causes of this situation is the northern winter generally SEM the boiler for heating,which leads to a large number of coal energy,thus exacerbating the atmospheric pollution,at the same time heating period,the weather is dry,less rainfall,solar radiation,atmospheric stability is good,the air flow performance is poor,which does not favor the diffusion of pollutants.The morphology of atmospheric particulates in Taiyuan is mainly composed of dust aggregates,mineral single particles and spherical particles.Wuyi square,park jin temple and Taiyuan normal university fine particulate matter in the atmospheric particles of coarse particles overall 63.5%,39.1%and 27.5%,wuyi square of atmospheric particulates is given priority to with fine particulate matter,EDS quantitative analysis shows that the main pollution is human emission source.Through to the Taiyuan city of 11 kinds of heavy metal element content in atmospheric particulate matter analysis shows that in the fine particulate matter elements of Ca,Al,Fe element,the element B,are relatively high content of zinc element,respectively including 8.243 g/m3,including 5.275 g/m3,including 5.275 g/m3,including 1.575 g/m3,including 1.575 g/m3.The content of Ca element,Mg element,Zn element,A1 element and Fe element in coarse particulate matter is relatively high,which is 13.932 g/m3,7.353 g/m3,4.307 g/m3,5.297 g/m3 and 3.324 g/m3.According to the analysis of heavy metal elements in different functional areas,the heavy metal pollution in wuyi square(traffic area)is serious,and the heavy metal pollution in Taiyuan normal university(wenjiao district)is relatively light.According to the analysis of the contents of heavy metal elements in different periods,its regularity is generally expressed as winter(heating period)higher than autumn(non-heating period),and the distribution characteristics of PM10 and PM2.5 are basically consistent.In this paper,using the method of enrichment factor analysis elements Cd and Pb element,the element zinc enrichment degree is higher,and Cu elements analysis of enrichment factors of heavy metals in different periods can be concluded that most of the degree of enrichment of heavy metals in winter is higher than the autumn,this may be related to the northern winter heating coal,and can be concluded that fine particulate matter on the enrichment factor of the whole is bigger than the coarse particles,the smaller the particle size,elements are easier to be enrichment.Of 9 kinds of plant species collected in Taiyuan city,which Chinese pagoda tree,lobular acacia,dust detentions of pagoda tree,strongest suit for ease of air pollution in taiyuan city tree species,and the gold and silver wood dust detentions and ash is poorer,it is not recommended as the greening tree species of taiyuan city.