PBBs, PBDEs, and PCBs levels in hair of residents around e-waste disassembly sites in Zhejiang Province, China, and their potential sources

This study was conducted to explore the exposure potential of Chinese residents to PBBs, PBDEs, and PCBs in e-waste disassembly sites in Zhejiang province. The contents of 23 PBB congeners, 12 PBDE congeners, and 27 PCB congeners in hair and in their potential sources, including soil and e-waste, were measured via GC-MS. The levels of PHAHs in the three subfamilies (i.e., the PBBs, PBDEs, and PCBs) were all considerably higher (P<0.05) in hair samples collected from the disassembly sites than from the control site. The highest levels of PBBs (57.77 ng g(-1) dw), PBDEs (29.64 ng g(-1) dw), and PCBs (181.99 ng g(-1) dw) in hair were all found in those from the disassembly site Xinqiu, which are respectively 2, 2, and 10 times more than those observed in hair from the control site Yandang. Among the three subfamilies of PHAHs, PCBs were the most predominant pollutants detected. PBBs, which have very limited information available in China, can be detected at a comparable level with PBDEs in these samples in the study. Therefore, these observations suggested that more attention should be given over the potential for environmental or occupational exposure to PHAHs present in e-waste. By and large, the PHAH levels measured in the hair samples were consistent with those detected in the soil. Hair analysis could thus be a valid screening tool for assessing human PHAHs exposure in and around e-waste disassembly sites.