Abstract:

In order to understand the characteristics of atmospheric heavy metal deposition in Daqing City, 17 deposition samples were collected using passive sampling during April 2008 to April 2009. 17 soil samples in the same places were also collected. The samples were analyzed for heavy metal concentration by Atomic Fluorescence Spectrometry (AFS) and Inductively Coupled Plasma-Atomic Spectrometry (ICP-AES). According to the calculating results, enrichment factors (EF) of Zn, Pb, As, Cd were significantly elevated compared with other elements(Hg, Cd, As, Cr, Ni and Pb). Correlation between deposition flux and content in soil was processed, and it shows significant correlation coefficient for both Zn and Cd, which indicates that the soil Zn and Cd contamination are attributed to atmospheric deposition. Comparison of the flux of heavy metals were carried out and it indicates large differences between districts, pointing out that the sources of atmospheric metal pollutants are related to geographical position, climate, humans population, the types and quantities of local enterprises and other anthropogenic sources.

Key words: atmospheric dry and wet deposition, heavy metals, polluting source, fluxes, Daqing City