title: Levels, profiles and source identification of PCDD/Fs in farmland soils of Guiyu, China.
abstract: The present study finished the first comprehensive survey of polychlorinated dibenzo-p-dioxin and dibenzofurans (PCDD/Fs) in farmland soils of Guiyu, China. Guiyu was a major electronic wastes (EWs) dismantling area, but primitive and crude EWs disposal manner had led to severe PCDD/Fs pollution there. Twenty-three farmland soil samples covering the entire Guiyu region were analyzed. Toxic equivalent quantities (I-TEQs) of soils in EWs disposal areas were 5.7-57pg TEQ g(-1), and the total concentrations of tetra- to octa-homologues were 2816-17738pgg(-1). The SL district was a heavily contaminated area, and the neighboring SMP town was influenced by Guiyu. EWs disposal might be the source of PCDD/Fs. The homologue profiles were of three types, representing different disposal manner of EWs. Tetrachlorodibenzo-p-dioxins (TCDDs) and octachlorodibenzo-p-dioxin (OCDD) could be used as indicators for source identification, open thermal disposal of EWs was inclined to lead to formation of TCDDs, OCDD was a product of non-thermal processes.
authors: State Environmental Protection Key Laboratory of Dioxin Pollution Control, National Research Center for Environmental Analysis and Measurement, Beijing, China.
authors: Pengjun
authors: P
authors: Xu
authors: Bu
authors: B
authors: Tao
authors: Nan
authors: N
authors: Li
authors: Li
authors: L
authors: Qi
authors: Yue
authors: Y
authors: Ren
authors: Zhiguang
authors: Z
authors: Zhou
authors: Lifei
authors: L
authors: Zhang
authors: Aimin
authors: A
authors: Liu
authors: Yeru
authors: Y
authors: Huang
mesh_terms: D000383:Agriculture / Q000706:statistics & numerical data*; D001572:Benzofurans / Q000032:analysis* / Q000737:chemistry; D002681:China; D003625:Data Collection; D000072338:Dibenzofurans, Polychlorinated; D000072317:Polychlorinated Dibenzodioxins / Q000031:analogs & derivatives* / Q000032:analysis / Q000737:chemistry; D025341:Principal Component Analysis; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis* / Q000737:chemistry
chemical_list: D001572:Benzofurans; D000072338:Dibenzofurans, Polychlorinated; D000072317:Polychlorinated Dibenzodioxins; D012987:Soil; D012989:Soil Pollutants