Abstract:
In order to investigate the possible changes of enviromental persistent organic pollutant (POPs) pollution properties during the industrial restructuring in typical e-waste dismantling areas, dioxins (PCDD/Fs), co-planar polychlorinated biphenyls (dl-PCBs) and polybrominated diphenyl ethers (PBDEs) in surface sediments from streams in Taizhou were sampled and analyzed with gas chromatography/high resolution mass spectrometry (GC/HRMS). In addition, the possible sources were also investigated by principal component analysis (PCA). The mean concentrations in Jiaojiang River and Jinqingzha Harbor were 3.18 and 1.91 ng/kg(WHO
2005-TEQ) for 2378-PCDD/Fs, 0.26 and 0.62 ng/kg(WHO
2005-TEQ) for dl-PCBs, 22.5 and 19.7 μg/kg for PBDEs, which were at the medium level of POPs in surface sediments in China and the world, and much lower than those in heavily polluted places as other e-waste dismantling sites. The results show that PCDD/Fs in surface sediment in Taizhou mainly originate from coal burning. dl-PCBs can be attributed to the residue of technical PCB products in the history or e-waste dismantling activities. PBDEs sources include the use of technical PBDEs products and the e-waste dismantling activities. YTZ site is close to a discharge port of a chemical engineering industrial zone; its PCDD/Fs and dl-PCBs concentrations were as high as 6.54×10
4 and 7.84×10
3 ng/kg, respectively. The possible sources are the secondary metallurgy or chemical waste recycling. This implies that new POPs emission sources may appear, and much more attention should be paid during industrial restructuring in the e-waste dismantling area. Some surface sediments have total toxic equivalent quantities exceeding the interim sediment quality guidelines (ISQGs) suggested by Canadian Environmental Council and United States Environmental Protection Agency, indicating ecological risks in Taizhou.