Effects of carbonaceous materials on microbial bioavailability of 2,2′,4,4′-tetrabromodiphenyl ether (BDE-47) in sediments

JOURNAL OF HAZARDOUS MATERIALS

卷:312

Article

Zhu, Baotong¹  Wu, Shan²  Xia, Xinghui¹  Lu, Xiaoxia³  Zhang, Xiaotian¹  Xia, Na¹  Liu, Ting¹ 

[1] Beijing Normal Univ, Sch Environm, State Key Lab Water Environm Simulat, Beijing 100875, Peoples R China

[2] Guangdong Inst Ecoenvironm & Soil Sci, Guangdong Key Lab Agr Environm Pollut Integrated, Guangzhou 510650, Guangdong, Peoples R China

[3] Peking Univ, Coll Urban & Environm Sci, Beijing 100871, Peoples R China

关键词: Polybrominated diphenyl ethers;    Carbonaceous materials;    Desorption;    Bioavailability;    Microorganisms;   

DOI  :  10.1016/j.jhazmat.2016.03.065

来源: Elsevier

【 摘 要 】

In this study, we investigated the influence of various types of carbonaceous materials (CMs) on the bioavailability of 2,2',4,4'-tetrabromodiphenyl ether (BDE-47) to polybrominated diphenyl ether (PBDE)degrading microorganisms in CM -amended sediments. The microbial debromination ratio of BDE-47 was reduced by 92.8%-98.2% in the 5.0% CM -amended sediment compared with in sediment without CM amendment after 100 d of anaerobic incubation. The concentrations of lower brominated products also decreased when the content of CMs increased from 0.2% to 5.0%. The inhibitory effects of CMs on BDE-47 debromination were CM content- and characteristic -specific. The reciprocals of BDE-47 debromination ratios and lower brominated product concentrations showed positive linear correlations with CM contents in sediments (p <0.01), and the slopes of linear regression fitting generally correlated with specific surface areas (SSAs) of CMs. Desorption of BDE-47 from CMs indicated the declined desorbing fraction of BDE-47 was responsible for the reduction in BDE-47 bioavailability to microorganisms, thus decreasing its debromination in sediments amended with CMs. This study revealed that CM amendment could reduce the PBDE bioavailability to PBDE-degrading microorganisms in sediments, and it is expected to help deepen our understanding of the environmental behaviors and risks of PBDEs. (C) 2016 Elsevier B.V. All rights reserved.

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