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Li Z.-G.,Shenzhen Environmental Monitoring Center Station | Zhou Z.-H.,Shenzhen Environmental Monitoring Center Station | Li S.-A.,Shenzhen Environmental Monitoring Center Station | Liu D.-Q.,Shenzhen Environmental Monitoring Center Station
Zhongguo Huanjing Kexue/China Environmental Science | Year: 2011

Air samples of thirteen sampling sites in Shenzhen were collected by the active high volume air sampler during December 2009 to January 2010 and June 2010. The PAHs in both air phase and particulates phase were analyzed, and the results showed that the concentrations of ∑PAHs in winter ranged from 17.9 to 92.3ng/m3, with average concentration of 45.3ng/m3, whereas in summer, the ∑PAHs concentrations scanned from 8.64 to 96.3ng/m3, with average concentration of 32.2ng/m3. The three to four rings PAHs occupied large proportion in all samples, which accounted for at least 75%. The concentration correlation analysis of monomers and ∑PAHs in two sampling periods demonstrated that the correlation in summer was better than that in winter. And the PAHs pollutants resources in winter were more complex than that in summer. The conclusion were also proved by the diagnostic ratio method, the oil and coal combustion, moter vehicles emission were the main resources in winter, but the main source in summer was only the motor vehicles emission. The toxic equivalence factor (TEF) and canceraganic risk assessment showed that the pollution of PAHs in Shenzhen city was still under a low level in comparison with other cities in China. Source


He L.,Shenzhen Environmental Monitoring Center Station | Li Z.-G.,Shenzhen Environmental Monitoring Center Station | Liu D.-Q.,Shenzhen Environmental Monitoring Center Station | Li S.-A.,Shenzhen Environmental Monitoring Center Station | Zhou Z.-H.,Shenzhen Environmental Monitoring Center Station
Zhongguo Huanjing Kexue/China Environmental Science | Year: 2012

Air samples of five sampling sites in Shenzhen were collected by the active Hi-Vol air sampler during 2011 Shenzhen Universiade. The PAHs in both air phase and particulates phase were analyzed, and the statistically reductions for all PAHs during the Shenzhen Universiade by all kinds of air quality protection measures relative to the summer of 2010 were studied. The concentrations of ∑PAHs in Shenzhen Universiade ranged from 15.80 to 62.09 ng/m3 (average: 30.77 ng/m3), a reduction of 28% compared with the summer of 2010. The 3-ring and 4-ring PAHs are the main monomers, which accounted for 88%. It is indicated that vehicle exhaust was the major PAHs source, but the PAHs contribution rate of Diesel car and coal combustion increased during Shenzhen Universiade by the diagnostic ratio method. ∑BaPeq was reduced by 36% compared with the summer of 2010, the concentration of BaP and ∑BaPeq in five sites were below our country's limited standard. The study of the inhalation cancer risk showed that the PAHs inhalation exposure lead to 7.3 cancer cases per million people in the summer of 2010, whereas the cases decreased to 3.8 in Shenzhen Universiade, a reduction of 48%. Source


Li Z.-G.,Shenzhen Environmental Monitoring Center Station | Zhou Z.-H.,Shenzhen Environmental Monitoring Center Station | Gu T.-F.,Shenzhen Environmental Monitoring Center Station | Li S.-A.,Shenzhen Environmental Monitoring Center Station | And 2 more authors.
Zhongguo Huanjing Kexue/China Environmental Science | Year: 2011

Air samples of thirteen sampling sites in Shenzhen were collected by Hi-vol air sampler during December 2009~January 2010 and June 2010, and mass concentrations of 16 organochlorine pesticides (OCPs) were analyzed. The main OCPs pollutions were DDTs, lindane, heptachlor, chlordane, hexacholrobenzene in winter, which accounted for 87% in total OCPs, whereas in the summer, the DDTs, chlordane, lindane were the most abundant compounds in the atmosphere which accounted for 89%. The concentrations of OCPs in thirteen sampling sites spanned the range of 742~3522 pg/m3 and 507~2197 pg/m3, and the average concentrations were 1769 pg/m3, 1163 pg/m3 respectively. There was "new" DDT input in Shenzhen, and technical DDT was suggested to be the important DDT source. The observed high level of HCH and Chlordane could be related to the current use of lindane as well as chlordane for termite control. Source

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