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雾天气下气态总汞的浓度较高.基于大气汞的化学反应,建立汞的迁移转化动力学方程,采用吉尔方法开展雾环境气溶胶内部化学组分演化过程的研究,并定量分析气溶胶粒径、环境气态汞浓度对气溶胶化学组分浓度的影响.研究结果表明:在近一天的时间演化中,气态和液态臭氧浓度整体上呈现降低的趋势.对于粒径为1um、0.01um的气溶胶,演化初期气态臭氧的浓度分别降低0.703%和0.237%;而气溶胶内部二价汞的浓度相差不大;对于100um与1um的气溶胶,其粒径相差100倍,但气溶胶内部二价汞的浓度相差不足2倍,说明粒径小的气溶胶更容易富集汞.此外,环境气态汞Hg0的浓度较大时,气溶胶内部所吸收的液态Hg0浓度也随之增大;液态汞浓度达到最大值的时间约为演化12小时后,即一天中12点至16点期间气溶胶内部液态汞的浓度最高.
In the foggy weather, the concentration of total mercury in the atmosphere is higher.According to the chemical reaction of atmospheric mercury, the kinetic equation of mercury migration and transformation is established, and the evolution of mercury aerosol internal chemical composition is studied by using the Jier method, and the aerosol particles Diameter and ambient mercury concentrations on aerosol chemical composition.The results show that: in nearly one day time evolution, the concentration of gaseous and liquid ozone shows a downward trend overall.For the particle size of 1um, 0.01um of gas The concentration of gaseous mercury in the aerosol decreased by 0.703% and 0.237%, respectively, while the concentration of bivalent mercury in aerosol did not change much. For the 100um and 1um aerosols, the particle size difference was 100 times, but the internal bivalence The difference of mercury concentration is less than 2 times, which shows that aerosols with small particle size are more likely to be enriched in mercury. In addition, the concentration of Hg0 in the aerosol increases with the concentration of Hg0 in the environment; Concentrations reached a maximum at approximately 12 hours after evolution, with the highest concentration of liquid mercury in the aerosol during the day between 12 and 16 o’clock.