Levels and isomer profiles of dechlorane plus in Chinese air |
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Authors: | Ren Nanqi Sverko Ed Li Yi-Fan Zhang Zhi Harner Tom Wang Degao Wan Xinnan McCarry Brian E |
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Affiliation: | International Joint Research Center for Persistent Toxic Substances (IJRC-PTS), State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, Heilongjiang, China. |
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Abstract: | The highly chlorinated flame retardant, Dechlorane Plus (DP), was measured in air across 97 Chinese urban and rural sites. DP was detected in 51 of these sites, with a mean air concentration in urban centers (15.6 +/- 15.1 pg m(-3)) approximately 5 times greater than those measured in rural areas (3.5 +/- 5.6 pg m(-3)). These DP levels were likely attributable to local sources rather than trans-boundary influences. Elevated urban levels were measured along the southeastern coast and in south-central China; the highest concentration was observed in the city of Kunming (66 pg m(-3)). Few of the urban samples (7%) and a majority of the rural samples (62%) were below the method detection limit, notably areas in rural central and northeastern China. The mean fractional abundance of the syn-DP isomer (f(syn)) in all samples was 0.33 +/- 0.10, values indistinguishable from that of a commercial mixture (f(syn) = 0.35). This paper represents the first report on DP levels in Chinese air, together with isomeric ratio profiles from urban and rural sites. |
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