Research on the acid rain under the short-term environment control measures of the Youth Olympic Games

Abstract:

Northern China emits the most part of acid pollution of the whole nation but turns out to be in a light acid precipitation extent. Research shows that it is the carbonate particles from dust that neutralize the acid in the rainfall. Construction in southern China becomes more and more active so that alkaline dusts from construction are receiving an increasing attention. Nanjing hosts the Youth Olympic Games in 2015，and implements a strict plan to control the emission of construction dust. Thus, The Youth Olympic Games provides a good opportunity to analyze the neutralization of alkaline dusts emitted from construction in Nanjing. Experiment is conducted by collecting the total of rainfall events from June to September in 2015, besides, TSP (total suspended particles) before and after each rainfall events is collected due to find the collaboration with rainfall. Ca²⁺,Mg²⁺,K⁺,Na⁺,Sr²⁺,F^-,Cl^-,SO₄^2-,NO₃^- concentrations in rain water and water soluble fraction of TSP are analyzed using ICP-OES and ICS in Nanjing University. Results showed that Ca²⁺and SO₄^2- makes the major part of total ions, indicating the fact that Nanjing is suffering from a severe acid rainfall and alkaline dusts which mainly consist of Ca²⁺ neutralize a large number of acid particles. pH of rainfall has a good correlation with the flux of TSP. pH of rainfall keeps falling as the YOG plan starts and picking up after the YOG, which indicates that the declination of artificial alkaline dust in TSP reduces the neutralization on the acid rainfall.