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环境科学学报 2012
Particle-bound PCDD/Fs, PBDD/Fs and TBBPA in the atmosphere around an electronic waste dismantling site in Guiyu, China
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Abstract:
A short-term sampling scheme was conducted to investigate the levels of particle-bound polychlorinated dibenzo-p-dioxins / dibenzofurans (PCDD/Fs), polybrominated dibenzo-p-dioxins / dibenzofurans (PBDD/Fs) and tetrabromobisphenol A in the atmosphere around an electronic waste dismantling area in Guiyu, China. The concentration of 2,3,7,8-PCDD/Fs and 2,3,7,8-PBDD/Fs were 126.54~524.78 pg·m-3 and 376.42~566.76 pg·m-3, respectively. The mean toxic equivalent (TEQ) values were 16.29 pg·m-3 and 91.28 pg·m-3, respectively, which were 1~4 orders of magnitude higher than those of other cities in the world. The PBDD/Fs pollution was much more serious than PCDD/Fs. Profiles of total native PCDD/F homologues in the air of Guiyu differed from typical urban air patterns reported in the literature, and the concentration of homologues decreased with the increase of the degree of chlorination. The concentration range of TBBPA was 66.01~95.04 ng·m-3, and PBDD/F concentration had obvious regressive relationship with the TBBPA content in the particles (r=0.69). Our preliminary inhalation risk assessment showed that residents in Guiyu were at a high dioxins exposure risk. The total dioxins intake doses far exceeded the tolerable daily intake limit (1~4 pg of W-TEQ·kg-1·d-1) suggested by WHO.
