Mercury Species in Precipitation
降水中汞的赋存形态

rainfall samples were collected in Beijing.Determination of volatile(Hg0),active(Hg2+)and inactive mercury(Hgre)in water phase and particle of rainfall shown that except for Hg0(w),the amount of rest mercury species during heating periods are higher than that during non heating periods.According to the contents and percentage of all mercury species in rainfall,which were checked by statistical test,the order was Hgre(w)>Hg0(w),Hg2+(w)] in water phase and Hgre(p)>Hg2+(p)>Hg0(p) in particle during non heating period;Hgre(w)>Hg2+(w)>Hg0(w) in water phase and Hgre(p)>Hg2+(p),Hg0(p)] in particle during heating period.In precipitation water,inactive mercury content is highest in both of water phase and particle.During non heating period the content and percentage of particle mercury HgT(p) is higher than soluble mercury HgT(p),but there is not obvious difference between particle and soluble mercury during heating period.The particle mercury Hg0(p) in rainfall plays leading role in migration and transformation of mercury.Heterogeneity phase oxidation of mercury particle may be an dominant process for species transformation of atmospheric mercury.Although there is small part of micro particle in rainfall,it adsorbs more than half of mercury in water phase.The total particle mercury is about more than 75% of total mercury in rainfall.