WANG Hong-yu1, LI Jin-juan1,*, SUN Zhe1, ZHAO Xiao-yun1, YUAN Xu2
(1.College of Resources and Environmental Engineering, Guizhou University, Guiyang 550003, China;
2.Quality and Safety Supervision, Inspection and Testing Center of Agricultural Products in Guizhou Province, Guiyang 550004, China)
Abstract：Dustfall samples were collected at urban and background sites monthly in Guiyang, Zunyi, and Anshun in 2012, the contents of Cr, As, Cd, Pb and Hg in the dustfall samples were determined by means of microwave digestion and ICP-MS, and their sources and contributions were analyzed. The results showed that the content of Pb was highest among the five heavy metals in dustfall, and that of Hg was lowest. In comparison with the background of soil, the contents of the four heavy metals were obviously higher as a whole except for Cr. The contents of Cd and Hg changed obviously with the seasons, those of Cr and Pb showed no trend of seasonal variation. The total amount of the five heavy metals in dustfall in Anshun City was highest in summer, which was higher in urban site than in background site, whereas that in Zunyi and Guiyang was highest in winter, the content in the background site in autumn and winter was higher than that in the urban site. The results of correlation coefficients and principal component analysis showed that heavy metal pollution in dustfall in Guiyang, Zunyi, Anshun cities were mainly affected by coal-combustion , and the contribution rates were 61%, 35 % and75%, respectively. In addition, the contribution rate of transportation dust in Anshun City reached 50%, and that of aeolian dust in Zunyi City accounted for 21%. In comparison with other cities, the contents of As, Cd, Hg and Pb in dustfall in the study cities were relatively high except for Cr.
Key words：dustfall; heavy metal pollution; typical acid-rain area; principal component analysis (PCA); source contribution
EARTH AND ENVIRONMENT Vol. 42, No.6, Tot No.302, 2014, Page 750-756
