[Levels and inhalation exposure analysis of polybrominated diphenyl ethers in atmosphere of Shenzhen]

Objective Concentrations and proliles of 7 polybrominated diphenyl ethers (PBDEs) compounds in ambient air in Shenzhen city were analyzed, and inhalation exposure amount for local resident was concluded firstly domesticly.

7 polybrominated diphenyl ethers compounds (PBDEs) (BDE-28, BD-E-47, BDE-99, BDE-100, BDE-153, BDE-154, BDE-183) in ambient air (including gas phase and particle phase ) were determined by isotope dilution high-resolution gas chromatography/high-resolution double-focusing magnetic mass spectrometer (HRGC/ HRMS) with High volume active air sampler for 11 sampling sites in 6 administrative district in Shenzhen. Furthermore, the inhalation exposure amount for local resident was calculated and concluded using concentration of PBDEs, respiratory rate and gas exchange in the air ratio in Alveolar.

The average concentration of PBDEs in atmosphere samples was 29.03 pg/m, ranged from 8.28-168.86 pg/m, the PBDEs pollution level as higher in rain season than that in dry season. The predominant PBDEs congeners measured in the two periods were BDE-47 and BDE-99, accounted for more than 31 and 16 percent of total concentration, respectively. While the specific profile was found in the dry season, the seven monomer distribution proportion tended to be equal, especially BDE-183 accounted for 17 percent of total concentration. Inhalation exposure amount for local adults and children was 4.72 pg/kg and 10.74 pg/kg respectively.

he levels of PBDEs in atmosphere in Shenzhen are higher than that in United Kingdom, South Korea, Osaka and Kyoto in Japan, however it is lower than the reported levels of Guangzhou and Beijing. Children's breathing exposure amount is higher than that in adults, this circumstances should be paid more attention. Furthermore, the present study provides the important basic data of PBDEs pollution level in Shenzhen and Inhalation exposure amount for local residents firstly.