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 determinated. 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 [similar to] 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% [similar to] 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 μg · (m2 · a)-1 in urban and 21.28 μg · (m2 · a)-1 in the contrast site.