التفاصيل البيبلوغرافية
| العنوان: |
Levels of polychlorinated biphenyls in 1,4-dichlorobenzene mothballs. |
| المؤلفون: |
Liu Wen-bin1, Zheng Ming-hui1 zhengmh@mail.rcees.ac.cn, Xing Ying1, Wang Dong-sheng1, Zhao Xing-ru1, Gao Li-rong1 |
| المصدر: |
Journal of Environmental Sciences (IOS Press). Jan2005, Vol. 17 Issue 1, p113-114. 2p. |
| مصطلحات موضوعية: |
*CHEMICAL industry, POLYCHLORINATED biphenyls, AROMATIC compounds, ORGANOCHLORINE compounds, CHLORINATION, BENZENE |
| مستخلص: |
Although polychlorinated biphenyls (PCBs) are globally recognized pollutant, an understanding of their resources as by-products in chemical industry is poorly investigated. This paper presents data from a study that was conducted in order to determine the extent of PCBs in 1,4-dichlorobenzene (p-DCB) mothballs. Total PCBs and dioxin-like PCBs were detected in five mothball samples. Total PCB concentrations ranged from 328 ng/g to 1798 ng/g, while the levels of WHO-TEQ were between 0.16 pg/g and 13 pg/g. Mean concentrations of total PCBs and WHO-TEQ in the samples were 724 ng/g and 3.2 pg/g, respectively. The highest level of PCB congeners was that of trichlorinated biphenyls (537 ng/g), which maybe due to the relatively low chlorination in the process of p-DCB production. A mechanism of the formation of PCBs from polychlorinated benzene in the presence of chlorine is also suggested. The results suggested that re-estimation on the risk of p-DCB products, especially the products for daily use such as mothballs, is expected. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
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