Chlorinated Dibenzo-p-Dioxin and Dibenzofuran Congener and Homologue Distributions in Tree Bark from Sauget, Illinois, U.S.

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• 作者：Mark H. Hermanson ; Glenn W. Johnson
• 刊名：Environmental Science & Technology
• 出版年：2015
• 出版时间：January 20, 2015
• 年：2015
• 卷：49
• 期：2
• 页码：855-862
• 全文大小：444K
• ISSN：1520-5851

文摘

Polychlorinated dibenzo-p-dioxins (PCDD) and dibenzofurans (PCDF) are ubiquitous urban/industrial contaminants found in tree bark, which acts as a long-term passive atmospheric sampler. Twenty seven bark samples (tree age 8鈥?2 years) were collected from residential and industrial areas near Sauget, IL to identify the trends of 2,3,7,8-Cl PCDD & PCDF congener distributions, toxic equivalents (TEQ), and PCDD & PCDF homologue distributions. The Sauget area is heavily industrialized, with a long history of chlorine production, and is the largest single contributor to air pollution exposure risk in St. Louis. Analysis of seven 2,3,7,8 Cl-substituted PCDD and 10 PCDF congeners showed 鈭慞CDD₇ ranging from 2214 to 71821 pg g^鈥? lipid and 鈭慞CDF₁₀ from 355 to 13707 pg g^鈥? lipid, the highest in trees <20 years old in both cases. OctaCCD and octaCDF respectively dominated 鈭慞CDD₇ (89% average) and 鈭慞CDF₁₀ (57% average). The 2,3,7,8-Cl congener profiles showed slight differences among samples showing that all were affected by similar sources but at different magnitudes. 鈭慣EQ ranged from 35 to 624 pg g^鈥? lipid, dominated by 1,2,3,7,8-PeCDD (average = 41.3% of total TEQ). Tetra-Cl through hepta-Cl homologues were dominated by non-2,3,7,8-Cl compounds for both CDD and CDF. Homologue profiles for 26 samples had a 鈥渟ink鈥?profile dominated by octaCDD, whereas one sample showed effects of a local source.