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VERSION:2.0
PRODID:-//Memento EPFL//
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SUMMARY:POPs in the environment in China
DTSTART:20081202T070000
DTSTAMP:20260415T082825Z
UID:87c257247eea226e242bd8840a281771a29ac4be0e1994edab5927d5
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr Lina Yu\, Chinese Academy of Science\, Beijing\nOrganic hal
 ogens have long been recognized to be severe environmental pollutants\, be
 cause of their persistence\, bioaccumulation and potential hazardous impac
 t on human health. In this study\, a large scale network of 31 passive air
  sampling sites was used to better understand the atmospheric distribution
 s of organic halogens across China. EOCl\, EOBr\, EOI\, and PCBs in the at
 mospheric samples were determined by a hybrid NAA method combined ith GC-M
 S. EOCl\, EOBr\, EOI\, and PCBs exhibited a huge urban-rural gradient. The
  highest values were detected in the areas of high usage and emission\, wh
 ich were linked to the local urbanization with relatively rapid economic d
 evelopment of China. The results clearly indicate that these pollutants ma
 inly come from industrial pollution. \nHigher EOCl contents in traffic are
 as show that exhaust emissions from vehicles is another main source of org
 anochlorines in air. The relative proportions of the known organochlorines
  (84 PCB congeners) to total EOCl are less than 1.0%\, which implies that 
 most of EOCl measure in air are unknown. PCBs are dominated by di-CB (mean
 : 41%) and tri-CB (mean: \n43%). No systematic distribution differences of
  PCB congeners in the sampling locations are found\, which suggest that at
 mospheric contamination of PCBs in China are still controlled by primary s
 ources\, rather than secondary sources.
LOCATION:BCH 5312
STATUS:CONFIRMED
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