Based On The Heilongjiang University Station, The Particle Size Distribution Of Organochlorine Pesticides In Atmospheric Particulate Matter Was Studied

This paper focuses on the particle size distribution characteristics of atmosphericparticulates and organochlorine pesticides(OCPs),from December 2016 to may 2017,325 TSP and sub-particle size samples were collected in Heilongjiang university workstation.Based on the samples collected from Heilongjiang university station,the distribution of atmospheric particulate matter OCPs in particle size with time,weather and other changes in Harbin was studied,and its enrichment law and possible sources were analyzed.The conclusions are as follows:(1)By analyzing the particle size classification of atmosph-eric particles in the research area,we can know that the total mass concentration of particles is less influenced by the weather,but the weather has a larger influence on the particle size distribution,and particles have a certain correlation with air quality index(AQI).(2)Through the detection and analysis of collected samples,it can be known that Endosulfan,HCHs and DDTs are the main OCPs pollutants in atmospheric particles in the research area.(3)Through the inspection and analysis of TSP samples in the air,it can be known that the mass concentration range of total OCPs in TSP is 82.39-15266.47 pg / m,and the distribution of pollutants in different weather is rainy days < sunny days < cloudy days-sunny days < cloudy days with the increase of temperature,the concentrations of pollutants will reach the peak in cloudy weather,and the erosion of rain is conducive to reducing the pollution content of HCHs,DDTs and Endosulfan in atmospheric particles.(4)HCHs,DDTs and Endosulfan are more likely to be enriched in fine particles in the samples with different particle sizes.(5)Through the analysis and comparison with the concentrations of OCPs in domestic and foreign cities,it can be known that the HCHs pollution in the air of the research area is relatively light,the DDTs pollution content in China is at a lower level,and Endosulfan pollution is at a higher level than that in other cities.(6)Through source analysis of main OCPs in atmospheric particulates in the research area,it can beknown that there is no input of HCHs in the research area,and the HCHs existing in the air should come from the volatilization of local environmental media and soil and water,and most HCHs have stabilized in the form of ?-HCHs after long-term degradation.Indicating that the use of industrial DDTs is the main source of OCPs in the air of the research area;There is no new source of Endosulfan in the study area,and the residual Endosulfan in the air comes from historical residues and volatilization of residual Endosulfan on the soil surface.