Authors: Jicheng Hu Minghui Zheng Wenbin Liu Changliang Li Zhiqiang Nie Guorui Liu Bing Zhang Ke Xiao Lirong Gao
Publish Date: 2012/09/29
Volume: 20, Issue: 5, Pages: 2905-2911
Abstract
Nine typical waste incinerating plants were investigated for polychlorinated naphthalene PCN contents in their stack gas The incinerators investigated include those used to incinerate municipal solid aviation medical and hazardous wastes including those encountered in cement kilns PCNs were qualified and quantified by isotope dilution high resolution gas chromatography–high resolution mass spectrometry techniques An unexpectedly high concentration of PCNs 13000 ng Nm−3 was found in the stack gas emitted from one waste incinerator The PCN concentrations ranged from 976 to 874 ng Nm−3 in the other waste incinerators The PCN profiles were dominated by lower chlorinated homologues with mono to tetraCNs being the main homologues present Furthermore the relationships between PCNs and other unintentional persistent organic pollutants involving polychlorinated dibenzopdioxins and dibenzofurans polychlorinated biphenyls hexachlorobenzene and pentachlorobenzene were examined to ascertain the closeness or otherwise of their formation mechanisms A good correlation was observed between ΣPCN tetra to octaCN and ΣPCDF tetra to octaCDF concentrations suggesting that a close relationship may exist between their formation mechanisms The results would provide an improved understanding of PCN emissions from waste incineratorsFinancial support for the present work was obtained from the National 973 Program nos 2011CB201500 and 2009CB421606 Knowledge Innovation Program of the Chinese Academy of Sciences KZCX2YWJS406 and National Natural Science Foundation of China no 21037003
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