Atmospheric emission of polychlorinated naphthalenes from iron ore sintering processes |
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Authors: | Liu Guorui Zheng Minghui Du Bing Nie Zhiqiang Zhang Bing Liu Wenbin Li Cheng Hu Jicheng |
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Institution: | a State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. P.O. Box 2871, Beijing 100085, China b State Environmental Protection Key Laboratory of Dioxin Pollution, National Research Center for Environmental Analysis and Measurement, Beijing 100029, China |
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Abstract: | Iron ore sintering processes constitute significant sources of dioxins, and studies have confirmed a close correlation between polychlorinated naphthalenes (PCNs) and dioxin formation. Thus, iron ore sintering processes are thought to be a potential source of PCNs, although intensive investigations on PCN emissions from sintering processes have not been carried out. Therefore, the aim of the present study was to qualify and quantify PCN emissions from nine sintering plants operating on different industrial scales. PCN concentrations ranged from 3 to 983 ng m−3 (0.4-23.3 pg TEQPCN m−3) and emission factors ranged from 14 to 1749 μg t−1 (0.5-41.5 ng TEQPCN t−1), with a geometric mean of 84 μg t−1 (2.1 ng TEQPCN t−1). The estimated annual emission of PCNs from sintering processes in China was 1390 mg TEQPCN. These figures will assist in the development of a PCN emissions inventory. Regarding emission characteristics, PCNs mainly comprised low-chlorinated homologs. The ratios of several characteristic PCN congeners were also measured and compared with those from other sources. Taken together, these results may provide useful information for identifying the sources of PCNs produced by iron ore sintering processes. |
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Keywords: | Polychlorinated naphthalenes Emission inventory Iron ore sintering Persistent organic pollutants Stockholm Convention |
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