Based On Heilongjiang University Station To Study The Characteristics Of Urban Atmospheric Phthalate Pollution

In this study,atmospheric particulate matter is taken as the research object to study the concentration level and particle size distribution characteristics of Phthalate Esters?PAEs?in urban atmospheric particulate matter.At the sampling station of Heilongjiang University in Harbin,from March 2018 to March 2019,a total of 60samples of PM_2.5 and PM₁₀ and 232 samples of particle size fraction were collected and selected by gas chromatography-mass spectrometry?GC-MS?.6 kinds of PAEs for analysis and detection,Based on the samples from the sampling station of Heilongjiang University,the variation of PAEs in the atmospheric particulates in the Harbin area with time and season and the distribution in the particle size were studied.The pollution characteristics of PAEs were determined by factors such as particulate matter,temperature and relative humidity in the environment.Analysis of the effects and enrichment patterns and sources of possibility.The study found that:1.The main PAEs pollutants in the atmospheric particulates in the study area are DEHP and DBP.2.There is a less significant positive correlation between the concentration of?₆PAEs in the particles of the study area and the humidity and temperature,and there is a less significant negative correlation between the concentration of particulate matter.3.In the sample of the size fraction,the total concentration of particulate matter in summer is lower.From the beginning of autumn heating,the concentration of particulate matter began to rise.Overall,the concentration was higher from October to March of the following year.4.In the particle size distribution of the particles,the concentration of particles of grade 0?d>9.0?m?is the highest,and the concentration of particles with large particle size is high,and the mass concentration of atmospheric particles is roughly coarse in the sampling period.Fine particle size bimodal distribution.5.BBP and DBP are more easily enriched in coarse particles and become smaller as the particle size becomes smaller.DEP is more easily enriched in fine particles,and the content decreases with the decrease of particle size.The distribution of DiBP is at both ends.The trend is higher in grade 1?5.8-9.0?m?and grade 6?0.7-1.1?m?.6.?₆PAEs in particles with a particle size greater than 1.1?m are more likely to accumulate in summer,increase with increasing temperature,and have the lowest concentration in winter at low temperatures.?₆PAEs in the particle size range of 0.4-1.1?m are more likely to accumulate in spring and lowest in winter.7.Through correlation analysis and principal component analysis of single component PAEs in PM_2.5 and PM₁₀,the probability of PAEs in the sampling area particles has a relatively close source of pollution,and the main source of pollution is daily commodity and personal care products.