春节期间烟花爆竹燃放对PM_(2.5)水溶性离子的影响

Influence of Fireworks and Firecrackers on the Water-solubleIons of PM_(2.5) during the Spring Festival

对2021年2月13日18日(农历腊月二十二-次年正月初七)时段内湖南省益阳市、岳阳市、长沙市、株洲市常规参数及PM_(2.5)水溶性离子进行监测,研究春节期间四城市的PM_(2.5)与水溶性离子变化趋势及烟花爆竹燃放对PM_(2.5)和水溶性离子的影响。结果表明,PM_(2.5)浓度变化趋势在春节期间呈“前期高、后期低”的特点,四城市中的峰值出现在长沙市12日3:00,浓度高达461μg/m^(3);受烟花爆竹燃放影响,在PM_(2.5)水溶性离子中,SO_(4)^(2-)、Mg^(2+)、Cl^(-)、K^(+)浓度与占比高值时段与烟花爆竹集中燃放时段对应,在相关性分析中,4种水溶性离子在春节期间相关性系数均在85%以上;烟花爆竹燃放对株洲市PM_(2.5)的贡献最大,贡献值和贡献率分别为3778.44μg/m^(3)、88.51%。

Monitor the general parameters and water-soluble ions of PM_(2.5)in Yiyang,Yueyang,Changsha,and Zhuzhou in Hunan Province during the period from February 13th to 18th,February 13,2021,study the changing trend of PM_(2.5)and water-soluble ions in the four cities during the Spring Festival and the impact of fireworks and firecrackers on PM_(2.5)and water-soluble ions.The results showed that the change trend of PM_(2.5)concentration during the Spring Festival was“high in the early period and low in the latter period”.The peak in the four cities appeared at 3:00 on the 12th in Changsha City,with a concentration as high as 461μg/m^(3).Affected by the discharge of fireworks,among the water-soluble ions of PM_(2.5),the time period when the concentration and proportion of SO_(4)^(2-),Mg^(2+),Cl^(-),and K^(+)are high corresponds to the period of concentrated discharge of fireworks and firecrackers.In the correlation analysis,the correlation coefficients of 4 water-soluble ions during the Spring Festival both were above 85%,the discharge of fireworks and firecrackers contributes the most to PM_(2.5)in Zhuzhou City,with the contribution value and contribution rate of 3778.44μg/m^(3)and 88.51%,respectively.