| Atmospheric particulate pollution has become an important problem in air pollution,it has a wide range of sources and very complex ingredients,especially in which the rich toxic ingredients,great harm to human health.In this paper,four sampling sites were set up in Guiyang city,and PM2.5 samples were collected from August 2015 to July 2016.The concentration level,season and spatial distribution of PM2.5 were studied by gravimetric method.The concentrations of major pollutants such as As,Hg,Se,Pb,Cd,Cr,Co,Ni and mercury,black carbon concentration and total carbon concentration in the PM2.5 samples were analyzed.At the same time,the characteristics and sources of particulate matter were studied.Get the following conclusions:Guiyang PM2.5 concentration ranging from 7?g/m3-219?g/m3,mean 36.64?g/m3;showing significant seasonal variation,namely: winter > spring > autumn > summer.Winter due to increased coal combustion sources,the least amount of precipitation,low temperature,inactive atmosphere convection,.etc resulted in atmospheric particulate matter concentration.Spring's windiness and autumn's biomass burning lead to the concentration take second place.Due to the largest rainfall,strong sun radiation,high air humidity,high temperatures,atmospheric boundary layer thickness,atmospheric stability is poor,strong convection,.etc therefore the atmosphere the particle concentration is the lowest in summer.In the carcinogenic heavy metals in atmospheric particles PM2.5 Guiyang,As and Cris above Environmental Air Quality Standard?GB 3095-2012?annual average concentration limit.Therefore,Guiyang has certain arsenic and chrome pollution.Winter The sampling points of carcinogenic heavy metals concentration in winter is generally higher than that in other seasons because coal is an important source of trace elements in winter particulate matter.Each carcinogenic heavy metal's concentration highest in Baiyun district,is for the reason that Baiyun district is a typical industrial area of Guiyang city.Black carbon of atmospheric particulate matter and PM2.5 were strongly related,illustrating to a great extent PM2.5 and black carbon aerosol particulate matter in the content is relatively low.The correlation between EC and NO2 is 0.699,belonging to the strong correlation.The correlation between EC and CO is 0.404,belonging to the medium relation.The correlation between EC and SO2 is 0.176,belonging to the low relation.To estimate that emissions of NO2 concentration of black carbon aerosol emission may be more value.The correlation between EC and NO2 is 0.660,illustrating that OC and EC have the same sources of pollution.The correlation between OCpri and EC is larger than that between OC and EC,illustrating that OC and EC have the same pollution sources,and there were secondary pollution.According to the OC/EC we can determine the main source of carbon component in Guiyang city atmospheric particulates are motor vehicle emissions,coal gas emissions emissions and household gas emissions.The results of TEM-EDX analysis show that the main types of PM2.5 particles in Guiyang are aluminosilicate/Silica minerals,silica-alumina fly ash,iron oxide particles,sulfate crystals,carbonaceous aerosols and many more.They are Mainly from coal and biomass combustion,motor vehicle emissions and so on. |
PDF Full Text Request