Long-Term Temporal Trends of Polychlorinated Biphenyls and Their Controlling Sources in China
- 13 February 2017
- journal article
- research article
- Published by American Chemical Society (ACS) in Environmental Science & Technology
- Vol. 51 (5), 2838-2845
- https://doi.org/10.1021/acs.est.6b05341
Abstract
Polychlorinated biphenyls (PCBs) are industrial organic contaminants identified as persistent, bioaccumulative, toxic (PBT), and subject to long-range transport (LRT) with global scale significance. This study focuses on a reconstruction and prediction for China of long-term emission trends of intentionally and unintentionally produced (UP) Sigma(7)PCBs (UP PCBs, from the manufacture of steel, cement and sinter iron) and their re-emissions from secondary sources (e.g., soils and vegetation) using a dynamic fate model (BETR-Global). Contemporary emission estimates combined with predictions from the multimedia fate model suggest that primary sources still dominate, although unintentional sources are predicted to become a main contributor from 2035 for PCB-28. Imported e-waste is predicted to play an increasing role until 2020-2030 on a national scale due to the decline of intentionally produced (IP) emissions. Hypothetical emission scenarios suggest that China could become a potential source to neighboring regions with a net output of similar to 0.4 t year(-1) by around 2050. However, future emission scenarios and hence model results will be dictated by the efficiency of control measures.Funding Information
- Norges Forskningsr?d (213577)
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