长春市大气颗粒汞及其干沉降通量

在1999-07～2000-01,监测了长春市5个功能区及一个对照点的大气颗粒汞浓度.非采暖期,市区颗粒汞浓度范围为0.022ng·m^-3～0.398ng·m^-3,平均为0.145 ng·m^-3,对照点平均为0.084ng·m^-3.采暖期,市区颗粒汞浓度范围为0.148ng·m^-3～1.984ng·m^-3,平均为0.461ng·m^-3,对照点平均为0.211ng·m^-3.采暖期颗粒汞浓度平均超出非采暖期2倍以上.燃煤与地面扬尘是大气颗粒汞的2个主要来源.地面扬尘对颗粒汞的贡献约占8%～30%.应用理论模型估算汞的干沉降通量,市区颗粒汞干沉降通量为43.06μg·(m2·a)^-1,对照点为21.28ng·(m²·a)^-1.

Atmospheric Particulate Mercury Concentration in Changchun City and Its Dry Deposition Flux

From July 1999 to January 2000, the particulate mercury(Hg(p)) concentration of five function sites and one contrast site were determined. In non-heating time, the particulate mercury concentration in urban atmosphere ranged from 0.022 to 0.398 ng.m-3 with an average of 0.145 ng.m-3 and the contrast site with an average of 0.084 ng.m-3. In heating time, the Hg(p) concentration in urban was in the range of 0.148-1.984 ng.m-3 with an average of 0.461 ng.m-3 and with an average of 0.211 ng.m-3 in the contrast site. The Hg(p) concentration in heating time was two times higher than that of non-heating time. Coal fire and wind-blown soil material were the two important sources of Hg(p). Wind-blown soil material contributed 7.9%-38.5% of the Hg(p) with an average of 24.1% in urban. Use theory model to estimate the dry deposition flux with the results of 43.06 micrograms.(m2.a)-1 in urban and 21.28 micrograms.(m2.a)-1 in the contrast site.