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. 2020 Apr:244:125385.
doi: 10.1016/j.chemosphere.2019.125385. Epub 2019 Nov 18.

Effect of mangrove species on removal of tetrabromobisphenol A from contaminated sediments

Yongcan Jiang  1 , Haoliang Lu  1 , Kang Xia  2 , Qiang Wang  1 , Jinjin Yang  1 , Hualong Hong  1 , Jingchun Liu  1 , Chonglin Yan  3
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Effect of mangrove species on removal of tetrabromobisphenol A from contaminated sediments

Yongcan Jiang et al. Chemosphere. 2020 Apr.

Abstract

The increase levels of tetrabromobisphenol A (TBBPA) in mangrove wetlands is of concern due to its potential toxic impacts on ecosystem. A 93-day greenhouse pot experiment was conducted to investigate the effects of mangrove plants, A. marina and K. obovata, on TBBPA degradation in sediment and to reveal the associated contributing factor(s) for its degradation. Results show that both mangrove species could uptake, translocate, and accumulate TBBPA from mangrove sediments. Compared to the unplanted sediment, urease and dehydrogenase activity as well as total bacterial abundance increased significantly (p < 0.05) in the sediment planted with mangrove plants, especially for K. obovata. In the mangrove-planted sediment, the Anaerolineae genus was the dominant bacteria, which has been reported to enhance TBBPA dissipation, and its abundance increased significantly in the sediment at early stage (0-35 day) of the greenhouse experiment. Compared to A. marina-planted sediment, higher enrichment of Geobater, Pseudomonas, Flavobacterium, Azoarcus, all of which could stimulate TBBPA degradation, was observed for the K. obovata-planted sediment during the 93-day growth period. Our mass balance result has suggested that plant-induced TBBPA degradation in the mangrove sediment is largely due to elevated microbial activities and total bacterial abundance in the rhizosphere, rather than plant uptake. In addition, different TBBPA removal efficiencies were observed in the sediments planted with different mangrove species. This study has demonstrated that K. obovata is a more suitable mangrove species than A. marina when used for remediation of TBBPA-contaminated sediment.

Keywords: Biodegradation; Mangrove wetland; Microbial community structure; Plant-induced; TBBPA.

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Conflict of interest statement

Declaration of competing interest There is no conflict of interest in the submission of this manuscript. The manuscript has been approved by all authors for submission. I would like to declare on behalf of my co-authors that the work described in this manuscript is original research that has not been published previously, and has not been under consideration for publication elsewhere, in whole or in part.

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