Analysis on pollution characteristics of five water-soluble ions in atmospheric PM2.5 in urban areas of Hohhot from 2020 to 2022

Abstract

Abstract: Objective To investigate the pollution levels of five water-soluble fine particulate matter（PM_2.5） ions,including NO₃^-,NH₄⁺,F^-,Cl^- and SO₄^2-,in the atmosphere of Hohhot urban area from 2020 to 2022,evaluate the comprehensive status of pollution control according to the characteristics of pollution sources. Methods The 252 days of atmospheric PM_2.5 samples collected from the 10th to the 16th of each month from 2020 to 2022 were taken as the research object. The average mass concentrations of NO₃^-,NH₄⁺,F^-,Cl^- and SO₄^2- were measured,which are the five typical inorganic ions in atmospheric PM_2.5 in urban areas of Hohhot from 2020 to 2022. Results The average concentrations of five typical inorganic ions in atmospheric PM_2.5 in Hohhot from 2020 to 2022 were 4.56 μg/m³ for NO₃^-,2.83 μg/m³ for NH₄⁺,0.10 μg/m³ for F^-,0.86 μg/m³ for Cl^- and 4.05 μg/m³ for SO₄^2-. There were statistically significant differences in the mass concentration of Cl^-,NH₄⁺ and NO₃^- among years（χ²=8.13,10.24,9.79,all P<0.05）,and there were statistically significant differences in the mass concentration of NO₃^-,SO₄^2-,NH₄⁺ and Cl^- among seasons（χ²=26.34,29.88,27.65,68.01,all P<0.05）. NO₃^-,SO₄^2- and NH₄⁺ were highly correlated and tend to bind to produce NH₄NO₃,（NH₄）₂SO₄ and （NH₄）HSO₄. Moreover,SO₄^2- and NO₃^- could be completely neutralized by NH₄⁺,and SO₄^2- was more prone to secondary oxidation than NO₃^-. Conclusion From 2020 to 2022,Hohhot has a good atmospheric PM_2.5 and water-soluble ion concentration level,a large pressure on the comprehensive status of exhaust emissions,and excellent environmental atmospheric control.

Key words: Water-soluble ions, Fine particulate matter, Pollution characteristics, Hohhot

CLC Number:

R122.1

YAN Aiyun, ZHANG Haiyan, CAI Yu, TU Ya, WANG Pujun. Analysis on pollution characteristics of five water-soluble ions in atmospheric PM_2.5 in urban areas of Hohhot from 2020 to 2022. [J]OCCUPATION AND HEALTH, 2024, 40(17): 2400-2404.

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Analysis on pollution characteristics of five water-soluble ions in atmospheric PM_2.5 in urban areas of Hohhot from 2020 to 2022

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