Pollution Characteristics And Health Risk Assessment Of Water-soluble Inorganic Ion In Atmospheric Fine Particles In Xing Tai

At present,atmospheric fine particles have become the main pollutants in the air of most cities.Not only will it cause photochemical pollution to reduce atmospheric visibility,it may also threaten our lives and health,will cause people to suffer from cardiovascular diseases,respiratory diseases and even increase the mortality of these diseases.Therefore,it is of great significance to study the pollution characteristics of water-soluble inorganic ions in atmospheric fine particles and their risks to human health.In this study,TH-159 series intelligent medium-flow particle samplers were selected,and sampling locations were selected in the Xingtai area without interference from other pollution sources.From July 2018 to April 2019,a total of 4 months of PM_2.5 samples were collected to represent the pollution situation in each season of spring,summer,autumn and winter,and a total of 116 valid samples were collected.Firstly,the mass concentration of fine particles was calculated by using the membrane weighing method.An ion chromatograph model Dionex ICS-1000 was used to analyze the eight water-soluble inorganic ions in the sample,and the daily average concentration of each ion component was calculated.After analyzing and calculating the daily average concentration of ions to describe the seasonal variation characteristics of each inorganic ion concentration,and then using SPSS software for correlation analysis and principal component analysis of each ion,the main source of fine particles in the study area can be obtained.The research finally took three anions Cl^-,NO₃^-and SO₄^2-as the research object,and determined the final relationship model by regression analysis of the concentration of these three ions and the concentration of fine particles,and then calculated the anion between 2013-2018 Annual average concentration,to study its relationship with respiratory disease mortality.Correlation analysis of 8 kinds of water-soluble inorganic ions shows that the correlation coefficients of Ca²⁺and Mg²⁺are very high,indicating that they are from the same source,and NH₄⁺has a high correlation with NO₃^-and SO₄^2-,suggesting the three have the same origin.Afterwards,it was obtained by PCA source analysis method that the main source of fine particulate matter in spring is motor vehicle source,the main source of fine particulate matter in summer is industrial source and biomass combustion source,and the main source of fine particles in autumn is dust and biomass combustion source,and the fine particles in winter mainly come from industrial sources.Using the existing data to analyze the correlation between each ion and fine particle concentration,the first three inorganic ions with significant correlation were selected for the curve regression analysis,the model with the highest fitting degree was selected,and the average annual PM_2.5concentration of 2013-2018 was substituted,and the annual average concentration of the three ions with high correlation in fine particles was obtained,and then the analysis showed that the mortality of Cl^-,NO₃^-,SO₄^2-and respiratory diseases were all positively correlated,the ion concentration decreased,the mortality of respiratory diseases also decreased,on the contrary,the higher ion concentration,the mortality of respiratory diseases also increased.