A study of elements flux and sources from atmospheric bulk deposition in the Chengdu Economic Region
In this project, from 2004 to 2005, 28 samplers collected bulk atmospheric samples, both dry and wet, on the agricultural lands in the Chengdu Economic Region (CER) of Sichuan. The samples were filtered and divided into soluble and insoluble fractions; both were analyzed for B, Mo, Mn, Zn, As, Cd, Hg, Pb, K, Ca, Na and Mg. The annual deposition flux of these 12 elements was calculated. The flux of the 4 hazardous elements, As, Cd, Hg and Pb, are 2. 77 mg · m-2 · a-1, 1. 77 mg · m-2 · a-1 , 0. 10 mg · m-2 · a-1 and 45. 95 mg · m-2 · a-1, respectively. Principal component analysis (PCA) via SPSS was employed for the total depositions and it demonstrates that the main components are Hg, Pb, Zn, Cd, Mo and As, which explains the status quo of atmospheric pollution. PCA analysis on total depositions, explains 94. 88 % of the total variance and three groups of variables are identified. Correlation between element deposition flux and element content in soil was processed, and it shows significant correlation coefficient for both Pb and Hg, which indicates that the soil Pb and Hg contamination are attributed to atmospheric bulk deposition, whereas for other elements more complicated sources need to be considered. Comparison of the deposition flux of elements was carried out and it shows relatively big differences between districts, especially for the significantly heavy loadings of As, Cd, Hg, Pb into Chengdu and Deyang, pointing out that the sources of atmospheric metal pollutants are related to the types and quantities of local enterprises.
atmospheric bulk depositionmetal elementfluxsourceChengdu Economic Region
NETL
NSTL
万方数据
维普
