Exploring the environmental fate of novel brominated flame retardants in a sediment-water-mudsnail system: Enrichment, removal, metabolism and structural damage

Wang, Yawen; Ling, Siyuan; Lü, Cong; Jiang, Lingling; Zhou, Shanqi; Fu, Mengru; Zhang, Wei; Lin, Kuangfei; Zhou, Bingsheng

doi:10.1016/j.envpol.2020.114924

Cited by 23 publications

(6 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The physicochemical properties and biotransformation capacity have been suggested as important factors that can influence the compound-specific trophodynamic behavior of NBFRs in the aquatic food web. , It was reported that NBFRs with higher Log K OW values have greater bioaccumulation capacity than those with lower Log K OW values. , However, great uncertainty exists in evaluating the trophodynamics when only the hydrophobicity of NBFRs is used for the evaluation. , The trophic magnification factors (TMFs) of BFRs (including NBFRs) in a food web from the Bohai Sea were found to exhibit a trend of first-rising-and-then-falling against their Log K OW values . Previous studies have also found slight biotransformation of several NBFRs in fish and marine mammals, ,− thereby affecting the trophic transfer behaviors of NBFRs in the food web . The biotransformation rates of some specific NBFRs in fish at high trophic levels (TLs) were consistent with their trophic transfer potentials in the aquatic food web of Taihu Lake .…”

Section: Introductionmentioning

confidence: 99%

Novel Brominated Flame Retardants (NBFRs) in a Tropical Marine Food Web from the South China Sea: The Influence of Hydrophobicity and Biotransformation on Structure-Related Trophodynamics

Hou

Huang

Pan

et al. 2022

Environ. Sci. Technol.

View full text Add to dashboard Cite

The increasing discharge and ubiquitous occurrence of novel brominated flame retardants (NBFRs) in aquatic environments have initiated intense global concerns; however, little information is available regarding their structure-related trophodynamics in marine food webs. In this study, a tropical marine food web including 29 species (18 fish and 11 invertebrate species) was collected from coral reef waters of the Xisha Islands, the South China Sea, for an analysis of 11 representative NBFRs. The mean ∑NBFR concentrations generally increased in the following sequence: sea cucumbers (0.330 ng/g lw) < crabs (0.380 ng/g lw) < shells (2.10 ng/g lw) < herbivorous fishes (2.30 ng/g lw) < carnivorous fishes (4.13 ng/g lw), with decabromodiphenyl ethane (DBDPE) and hexabromobenzene (HBB) as the predominant components. Trophic magnification was observed for all of the investigated NBFRs, with trophic magnification factors (TMFs) ranging from 1.53 (tetrabromobisphenol A bis(dibromopropyl ether)) to 5.32 (HBB). Significant negative correlations were also found between the TMFs and the tested in vitro transformation clearance rates (CL in vitro ) for the target NBFRs except for bis(2-ethylhexyl)-3,4,5,6-tetrabromo-phthalate (TBPH) (p < 0.05). Multiple linear regression analysis confirmed that the transformation rate is a more powerful predictor for TMFs than the hydrophobicity of NBFRs in this marine food web.

show abstract

Section: Introductionmentioning

confidence: 99%

Novel Brominated Flame Retardants (NBFRs) in a Tropical Marine Food Web from the South China Sea: The Influence of Hydrophobicity and Biotransformation on Structure-Related Trophodynamics

Hou

Huang

Pan

et al. 2022

Environ. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…PBBz, TeBBz, and TrBBz were reported to be the step-by-step debromination products of HBBz under abiotic/biotic degradation/metabolism conditions. 13 , 49 , 50 No significant correlation was found between the concentrations of PBBz/TeBBz/TrBBz and HBBz in either porpoise or dolphin blubber samples, suggesting that the source of TrBBz/TeBBz/PBBz and HBBz is different in the investigated samples, and the debromination of HBBz may not be the main source of PBBz, TeBBz, and TrBBz in the investigated marine mammals. PBBz is widely used in polymeric materials, electronic equipment, and household furniture and has become ubiquitous in the aquatic environment and biota owing to relatively high bioaccumulation potential, while reports on the direct production and use of TrBBz and TeBBz are lacking.…”

Section: Resultsmentioning

confidence: 84%

“…Combined with HBBz quantified via target analysis, in total, four bromobenzenes were found in the cetacean bubbler samples in this study. PBBz, TeBBz, and TrBBz were reported to be the step-by-step debromination products of HBBz under abiotic/biotic degradation/metabolism conditions. ,, No significant correlation was found between the concentrations of PBBz/TeBBz/TrBBz and HBBz in either porpoise or dolphin blubber samples, suggesting that the source of TrBBz/TeBBz/PBBz and HBBz is different in the investigated samples, and the debromination of HBBz may not be the main source of PBBz, TeBBz, and TrBBz in the investigated marine mammals. PBBz is widely used in polymeric materials, electronic equipment, and household furniture and has become ubiquitous in the aquatic environment and biota owing to relatively high bioaccumulation potential, while reports on the direct production and use of TrBBz and TeBBz are lacking. ,, The developed industry and high population density of the PRD may promote the wide production and use of PBBz, and the presence of PBBz in marine mammals can mainly be attributed to the direct emission from the PRD rather the degradation/debromination of HBBz.…”

Section: Resultsmentioning

confidence: 85%

Temporal Trends and Suspect Screening of Halogenated Flame Retardants and Their Metabolites in Blubbers of Cetaceans Stranded in Hong Kong Waters during 2013–2020

Wang

Ruan

Jin

et al. 2023

Environ. Sci. Technol.

View full text Add to dashboard Cite

Halogenated flame retardants (HFRs) are a large class of chemical additives intended to meet flammability safety requirements, and at present, they are ubiquitous in the environment. Herein, we conducted the target analysis and suspect screening of legacy and novel HFRs and their metabolites in the blubber of finless porpoises (Neophocaena phocaenoides; n = 70) and Indo-Pacific humpback dolphins (Sousa chinensis; n = 35) stranded in Hong Kong, a coastal city in the South China Sea, between 2013 and 2020. The average concentrations of total target HFRs (ΣHFRs) were 6.48 × 10 3 ± 1.01 × 10 4 and 1.40 × 10 4 ± 1.51 × 10 4 ng/g lipid weight in porpoises and dolphins, respectively. Significant decreasing temporal trends were observed in the concentrations of tetra-/penta-/hexa-bromodiphenyl ethers (tetra-/penta-/hexa-BDEs) in adult porpoises stranded from 2013−2015 to 2016−2020 (p < 0.05), probably because of their phasing out in China. No significant difference was found for the concentrations of decabromodiphenyl ether and hexabromocyclododecane, possibly due to their exemption from the ban in China until 2025 and 2021, respectively. Eight brominated compounds were additionally identified via suspect screening. A positive correlation was found between the concentrations of tetra-BDE and methyl-methoxy-tetra-BDE (Me-MeO-tetra-BDE) (p < 0.05), indicating that the metabolism of tetra-BDE may be a potential source of Me-MeO-tetra-BDE in marine mammals.

show abstract

“…Solvent T1 * sensitizes NBFRs S0 to NBFRs T1 * by energy transfer: Solvent T1 * + NBFRs S0 → NBFRs T1 * + Solvent S0 , where S0 represents the ground state and T1 represents the first excited triaxial state. The reactivity of the light-induced reaction between NBFRs and solvent molecules was judged by comparing the vertical transition energy of Solvent T1 * and NBFRs T1 * [ 40 ]. The subsequent light-induced reactions between NBFRs and solvent molecules are listed in Table 1 .…”

Section: Methodsmentioning

confidence: 99%

Photodegradation Kinetics and Solvent Effect of New Brominated Flame Retardants (NBFRS) in Liquid Medium

Jin

et al. 2022

IJERPH

View full text Add to dashboard Cite

The photolysis of four typical NBFRs, hexabromobenzene (HBB), pentabromotoluene (PBT), pentabromobenzyl acrylateare (PBBA) and pentabromoethylbenzene (PBEB), were explored under different irradiation light wavelengths, initial concentrations and organic solvents. Density functional theory was used for chemical calculation to explore the internal mechanism of solvent effect. All degradation kinetics conformed to the first-order kinetic model. Under different irradiation light wavelengths, the degradation rates were in the following order: 180~400 nm (0.1702~0.3008 min−1) > 334~365 nm (0.0265~0.0433 min−1) > 400~700 nm (0.0058~0.0099 min−1). When the initial concentration varied from 0.25 mg/L to 1 mg/L, the degradation rate decreased from 0.0379~0.0784 min−1 to 0.0265~0.0433 min−1 under 334~365 nm irradiation, which might be attributed to the reduction in light energy received per unit area and competition from intermediate metabolites. In different organic solvents, the degradation rates were in the order of acetone (0.1702~0.3008 min−1) > toluene (0.0408~0.0534 min−1) > n-hexane (0.0124~0.0299 min−1). Quantum chemical calculation and analysis showed that the energy change in electron transfer between solvent and NBFRs was the key factor to solvent effect in the degradation of NBFRs. The active sites and degradation pathways of NBFRs were also speculated, the nucleophilic reaction of the Br atom on a benzene ring was the main process of photodegradation and it was preferential to remove the bromine and then the ethyl group on the benzene ring. Our research will be helpful in predicting and evaluating their photochemical behavior in different environment conditions.

show abstract

Exploring the environmental fate of novel brominated flame retardants in a sediment-water-mudsnail system: Enrichment, removal, metabolism and structural damage

Cited by 23 publications

References 33 publications

Novel Brominated Flame Retardants (NBFRs) in a Tropical Marine Food Web from the South China Sea: The Influence of Hydrophobicity and Biotransformation on Structure-Related Trophodynamics

Novel Brominated Flame Retardants (NBFRs) in a Tropical Marine Food Web from the South China Sea: The Influence of Hydrophobicity and Biotransformation on Structure-Related Trophodynamics

Temporal Trends and Suspect Screening of Halogenated Flame Retardants and Their Metabolites in Blubbers of Cetaceans Stranded in Hong Kong Waters during 2013–2020

Photodegradation Kinetics and Solvent Effect of New Brominated Flame Retardants (NBFRS) in Liquid Medium

Contact Info

Product

Resources

About