Characterization of aryl hydrocarbon receptor agonists in sediments of Wenyu River, Beijing, China

WATER RESEARCH

卷:43

Article

Luo, Jianping¹  Ma, Mei¹  Zha, Jinmiao¹  Wang, Zijian¹ 

[1] Chinese Acad Sci, State Key Lab Environm Aquat Chem, Ecoenvironm Sci Res Ctr, Beijing 100085, Peoples R China

关键词: Ah-agonist;    PCDD/Fs;    PCBs;    PAHs;    H4IIE;    Sediment;   

DOI  :  10.1016/j.watres.2009.03.015

来源: Elsevier

【 摘 要 】

Aryl hydrocarbon receptor agonistic (Ah-agonistic) effects of 23 sediments from Wenyu River in Beijing, China were evaluated using the H4IIE cell bioassay. Five samples were selected for chemical analysis of most concerned Ah-agonists, i.e. polychlorinated dibenzo-p-dioxins (PCDDs), dibenzofurans (PCDFs), biphenyls (PCBs), and polycyclic aromatic hydrocarbons (PAHs). All raw sediment extracts induced significant Ah-agonistic effects, and the bioassay-derived 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) equivalents of raw extracts (TEQ(raw)s) ranged from 8.5 to 336.0 pg/g dry weight (dw). Chemical analysis-derived TEQs (TEQ(chem)s) ranged from 20.5 to 64.8 pg/g dw. When raw extracts were purified by sulphuric acid silica gel column to derive acid stable fraction, the TCDD equivalents in this fraction (TEQ(stable)s) ranged from 2.7 to 63.8 pg/g dw. PCBs, PCDDs and PCDFs contributed about 51.4-72.1%, 1.2-7.3%, and 16.4-34.8% of TEQ(stable)s, respectively, and the sum was 69.1-108.6%. Therefore, about 65.0% of TEQ(raw)s could be attributed to acid labile fraction and only 3.3-9.6% to PAHs. These observations suggested that acid stable fraction and labile fraction contributed together to total Ah-agonistic effects in the sediments, and PCBs and PCDFs might be the two main components in acid stable Ah-agonists. The proposed approach using both H4IIE cell bioassay and chemical analysis could be used for characterization and prioritization of Ah-agonists in river sediments and helpful to the following progression of ecological remediation. (C) 2009 Elsevier Ltd. All rights reserved.

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