LIN Xiangnan1, DONG Xian1,2, CHEN Zhuo1,2
(1. School of Chemistry and Materials Science, Guizhou Normal University, Guiyang 550001, China;
2. Guiyang key Laboratory of Atmospheric Fine Particles and Air Pollution Chemistry, Guiyang 550001, China)
Abstract: PM2.5 sample had been collected at urban sites in Guiyang from September 2015 to August 2016. The temporal and spatial characteristics, enrichment and seasonal variation characteristics of 8 carcinogenic harmful elements’ mass concentrations were analyzed with AAS, AFS and Mercury Analyzer and their possible sources were tested using the enrichment factor method. The order of the concentrations of five carcinogenic harmful elements Pb, Cr (Ⅵ), As, Cd and Hg is Cr (Ⅵ) >> As> Hg> Cd> Pb, and the concentrations of As and Cr are higher than their reference limit of China's Ambient Air Quality Standard. Higher enrichment factors of Cd, Hg, Pb and Se were found. In addition to Co, other seven carcinogenic heavy metals enrichment factors EF >10, and Cd, Hg, Pb and Se are significantly enriched, and may be mainly derived from coal and motor vehicle exhaust emissions. Winter enrichment factors are higher than other seasons.
Key words: PM2.5; carcinogenic heavy metals; enrichment; source
EARTH AND ENVIRONMENT Vol.47, No.3, Tot No.329, 2019, Page 254-260
