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Title: Evaluation of dioxin-like activities in settled house dust from vietnamese e-waste recycling sites: Relevance of polychlorinated/brominated dibenzo- p -dioxin/furans and dioxin-like PCBs
Authors: Tue, Nguyen M
Suzuki, Go
Takahashi, Shin
Isobe, Tomohiko
Trang, Pham T.K.
Viet, Pham H
Tanabe, Shinsuke
Keywords: Chemically activated LUciferase gene expressions;Control sites;Dioxin-like PCBs;Dl-PCBs;Dust ingestion;Dust samples;e-Waste;House dust
Issue Date: 2010
Publisher: H. : ĐHQGHN
Abstract: Few studies have investigated the human exposure to the ensemble of dioxin-related compounds (DRCs) released from uncontrolled e-waste recycling, especially from a toxic effect standpoint. This study evaluated the TCDD toxic equivalents (TEQs) in persistent extracts of settled house dust from two Vietnamese e-waste recycling sites (EWRSs) using the Dioxin-Responsive Chemically Activated LUciferase gene eXpression assay (DR-CALUX), combined with chemical analysis of PCDD/Fs, DL-PCBs, PBDD/Fs, and monobromo PCDD/Fs to determine their TEQ contribution. The CALUX-TEQ levels in house dust ranged from 370 to 1000 pg g-1 in the EWRSs, approximately 3.5-fold higher than in the urban control site. In EWRS house dust, the concentrations of the unregulated PBDFs were 7.7-63 ng g-1, an order of magnitude higher than those of regulated DRCs (PCDD/Fs and DL-PCBs), and PBDFs were also principal CALUX-TEQ contributors (4.2-22%), comparable to PCDD/Fs (8.1-29%). The CALUX-TEQ contribution of DRCs varied, possibly depending on thermal processing activities (higher PCDD/F-TEQs) and PBDE content in the waste (higher PBDF-TEQs). However, the percentage of unknown dioxin-like activities was high in all dust samples, indicating large contribution from unidentified DRCs and/or synergy among contaminants. Estimates of TEQ intake from dust ingestion suggest that children in the EWRSs may be adversely affected by DRCs from dust. © 2010 American Chemical Society.
Description: Environmental Science and Technology 44(23), pp. 9195-9200
ISSN: 0013936X
Appears in Collections:Bài báo của ĐHQGHN trong Scopus

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