Formation Pathways of Mono- to Octa-Chlorinated Dibenzo-p-dioxins and Dibenzofurans in Main Organochemical Industries

• DOI: 10.1021/acs.est.5b02683
• Publication Date: 2015-08-24T19:43:48Z
• Authors: Ying Han; Wenbin Liu; Wenxiao Pan; Pu Wang; Zhenyu Tian; Yuyang Zhao; Mengjing Wang; Xuebin Chen; Xiao Liao; Minghui Zheng
• Keywords: Polychlorinated dibenzofurans; Polychlorinated Dibenzo-p-dioxins

The concentrations and formation pathways of mono- to octa-chlorinated dibenzo-p-dioxins (PCDDs) dibenzofurans (PCDFs) were investigated in main organochemical industries. High levels PCDDs PCDFs detected. total 27 PCDD/F congeners chloranil, 2,4-D, 1,4-dichlorobenzene 5302397 ± 8944449, 20963 15908, 242 67 pg g(-1), respectively, the less-chlorinated 12006 20155, 9536 5594, 195 94 respectively. distribution trends less more chlorinated PCDD/Fs similar different chemical plants because their pathways, which may also be related degree chlorination products purification processes. 1,2,3,4-TeCDF 2,4,8-TrCDF selected as model molecules calculate bond dissociation energy, showing that 2-MCDF, 3-MCDF, 2,8-DCDF are easily formatted shown by analytical results. proposed explain why 2-MoCDF, 2,8-DiCDF, 2,4,8-TrCDF, 2,3,4,7,8-PeCDF dominant is largest contributor I-TEQs most studies.