Formation of PCDD/Fs and PCBs in the process of production of 1,4-dichlorobenzene
In: Chemosphere, Jg. 57 (2004-12-08), Heft 10, S. 1317-1323
academicJournal
Zugriff:
The occurrence and distribution of polychlorinated dibenzo-p-dioxins (PCDDs), polychlorinated dibenzofurans (PCDFs) and polychlorinated biphenyls (PCBs) in a typical process of production of 1,4-dichlorobenzene (p-DCB) were investigated systematically in this study. P5CDFs and H6CDFs were the main congeners of PCDD/Fs, while only low levels of other PCDD/Fs were detected in the samples. The concentrations of PCBs were up to 4614ng/g in the semi-manufactured products, and 1797ng/g in the product p-DCB. It was also found that high chlorinated PCB congeners increased with the further chlorination. The levels of PCDD/Fs decreased obviously in the purification process, while PCBs could not be removed effectively. Polychlorophenols and other important dioxin precursors (1,4-dichloro-2-phenoxybenzene and 2-phenyl-2′,5,5′-trichlorophenol) were also analyzed. Polychlorophenols which ortho- and para-positions of the hydroxyl were substituted by chlorine were the main congeners. In addition, a possible pathway of the formation of PCDD/Fs and PCBs in the production of p-DCB was presented. The results of this article suggest that re-estimation on the risk of using p-DCB products, especially the products for daily use such as mothballs, is expected. [Copyright &y& Elsevier]
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Formation of PCDD/Fs and PCBs in the process of production of 1,4-dichlorobenzene
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Autor/in / Beteiligte Person: | Liu, Wenbin ; Zheng, Minghui ; Wang, Dongsheng ; Xing, Ying ; Zhao, Xingru ; Ma, Xiaodong ; Qian, Yong |
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Zeitschrift: | Chemosphere, Jg. 57 (2004-12-08), Heft 10, S. 1317-1323 |
Veröffentlichung: | 2004 |
Medientyp: | academicJournal |
ISSN: | 0045-6535 (print) |
DOI: | 10.1016/j.chemosphere.2004.09.024 |
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