Heavy metal levels and chemical speciation in PM-2.5 of Guangzhou, China
The PM2.5 samples used in this study were collected from different spatial positions, the roadside (RS) and the building roof (BR), in Guangzhou city from October 29th to November 8<th> of 2006. The total concentration of 12 target elements in particle samples were quantified by acid digestion method, and the chemical speciation of these elements were extracted with a sequential extraction procedure (SEP), which divides heavy metals into four different chemical fractions. The experimental results showed that the daily average concentration of PM2.5 were much higher than outdoor PM2.5 standard (0. 065mg·m <3>) recommended by US-EPA, and the particle contents of PM2.5 at the BR were significantly higher than that of the RS and high correlation was found between them. Total concentrations of 12 elements were quite high in PM2.5, and with an order of AI>Fe>Zn>Pb>Cu>Mn> As>Cr>Ni>Cd>Mo>Co. According to the data of chemical speciation analysis, Zn is relatively high in the soluble and exchangeable fraction, Pb in the carbonates, oxides and reducible fraction, Fe and Co in the bound to organic matter, oxidisable and sulphidic fraction, and Al in the residual fraction. Assuming that the mobility and bioavailability are related to the solubility of geochemical forms of the metals, the apparent mobility and potential metal bioavaiability of these metals in PM2.5 is: Zn≈Mo>As≈Cd>Mn≈Ni>Cu≈Co>Cr≈ Pb>Fe≈Al.
air pollution chemical speciation fine particles heavy metal PM 2.5
X. D. Feng Z. Dang W. L. Huang C. Yang
School of Environmental Science and Engineering, South China University of Technology, Guangzhou, 51 Department of Environmental Sciences, Rutgers University, New Brunswick, New Jersey, 08901-8551, USA
国际会议
第九届痕量元素生物地球化学国际会议(9th International Conference on the Biogeochemistry of Trace Elements)
北京
英文
967-968
2007-07-15（万方平台首次上网日期，不代表论文的发表时间）