Estimation and characterization of PCDD/Fs, dl-PCBs, PCNs, HxCBz and PeCBz emissions from magnesium metallurgy facilities in China.
Magnesium production is considered to be one potential source of unintentional persistent organic pollutants (unintentional POPs). However, studies on the emissions of unintentional POPs from magnesium metallurgy are still lacking. Emissions of unintentional POPs, such as polychlorinated dibenzo-p-dioxins/dibenzofurans (PCDD/Fs), dioxin-like polychlorinated biphenyls (dl-PCBs), polychlorinated naphthalenes (PCNs), hexachlorobenzene (HxCBz) and pentachlorobenzene (PeCBz) are covered under the Stockholm Convention. In this study, these emissions were investigated through a magnesium smelting process. Stack gas and fly ash samples from a typical magnesium plant in China were collected and analyzed to estimate the emissions of unintentional POPs from magnesium metallurgy. Emissions factors of 412 ng TEQ t(-1) for PCDD/Fs, 18.6 ng TEQ t(-1) for dl-PCBs, 3329 μg t(-1) for PCNs, 820 μg t(-1) for HxCBz, and 1326 μg t(-1) for PeCBz were obtained in 2009. Annual emissions from magnesium metallurgy in China were estimated to be 0.46 g WHO-TEQ for PCDD/Fs and dl-PCBs, 1651 g for PCNs, 403 g for HxCBz and 653 g for PeCBz, respectively.
State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
Zhiqiang
Z
Nie
Minghui
M
Zheng
Wenbin
W
Liu
Bing
B
Zhang
Guorui
G
Liu
Guijin
G
Su
Pu
P
Lv
Ke
K
Xiao
D000393:Air Pollutants / Q000032:analysis*; D001572:Benzofurans / Q000032:analysis; D002681:China; D002722:Chlorobenzenes / Q000032:analysis; D060729:Coal Ash / Q000032:analysis; D000072338:Dibenzofurans, Polychlorinated; D004784:Environmental Monitoring; D005740:Gases / Q000032:analysis; D006581:Hexachlorobenzene / Q000032:analysis; D008274:Magnesium / Q000737:chemistry*; D008669:Metallurgy; D009281:Naphthalenes / Q000032:analysis; D011078:Polychlorinated Biphenyls / Q000032:analysis; D000072317:Polychlorinated Dibenzodioxins / Q000031:analogs & derivatives / Q000032:analysis
D000393:Air Pollutants; D001572:Benzofurans; D002722:Chlorobenzenes; D060729:Coal Ash; D000072338:Dibenzofurans, Polychlorinated; D005740:Gases; D009281:Naphthalenes; D000072317:Polychlorinated Dibenzodioxins; D006581:Hexachlorobenzene; C003060:pentachlorobenzene; D011078:Polychlorinated Biphenyls; D008274:Magnesium