Sedimentary PBDEs in urban areas of tropical Asian countries

Kwan, Charita S.; Takada, Hideshige; Mizukawa, Kaoruko; Saha, Mahua; Rinawati,; Santiago, Evangeline C.

doi:10.1016/j.marpolbul.2013.09.023

Cited by 34 publications

(15 citation statements)

References 39 publications

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“…The DBDPE concentrations in marine sediments of northern China were at a moderate level, comparatively. There was no doubt that BDE 209 was the predominate congener of PBDEs found in the samples similar to the data reported in other studies (Kwan et al, 2013;Moon et al, 2012), and it accounted for 90.1 ± 11.3% of all the PBDEs congeners detected in all the sediments (except those from site Y8 where BDE 209 was not detected). The detection frequency of BDE 209 in all sediments was 98.0%.…”

Section: Concentrations and Comparisons With Other Studiessupporting

confidence: 88%

Polybrominated diphenyl ethers (PBDEs) and alternative brominated flame retardants (aBFRs) in sediments from four bays of the Yellow Sea, North China

Zhen

Tang

Xie

et al. 2016

Environmental Pollution

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a b s t r a c tThe distribution characteristics and potential sources of polybrominated diphenyl ethers (PBDEs) and alternative brominated flame retardants (aBFRs) were investigated in 54 surface sediment samples from four bays (Taozi Bay, Sishili Bay, Dalian Bay, and Jiaozhou Bay) of North China's Yellow Sea. Of the 54 samples studied, 51 were collected from within the four bays and 3 were from rivers emptying into Jiaozhou Bay. Decabromodiphenylethane (DBDPE) was the predominant flame retardant found, and concentration ranged from 0.16 to 39.7 ng g À1 dw and 1.13e49.9 ng g À1 dw in coastal and riverine sediments, respectively; these levels were followed by those of BDE 209, and its concentrations ranged from n.d. to 10.2 ng g À1 dw and 0.05e7.82 ng g À1 dw in coastal and riverine sediments, respectively. The levels of DBDPE exceeded those of decabromodiphenyl ether (BDE 209) in most of the samples in the study region, whereas the ratio of DBDPE/BDE 209 varied among the four bays. This is indicative of different usage patterns of brominated flame retardants (BFRs) and also different hydrodynamic conditions among these bay areas. The spatial distribution and composition profile analysis indicated that BFRs in Jiaozhou Bay and Dalian Bay were mainly from local sources, whereas transport from Laizhou Bay by coastal currents was the major source of BFRs in Taozi Bay and Sishili Bay. Both the P PBDEs and P aBFRs (sum of pentabromotoluene (PBT), 2,3-diphenylpropyl-2,4,6-tribromophenyl ether (DPTE), pentabromoethylbenzene (PBEB), and hexabromobenzene (HBB)) were at low concentrations in all the sediments. This is probably attributable to a combination of factors such as low regional usage of these products, atmospheric deposition patterns, coastal currents transportation patterns, and degradation processes for higher BDE congeners. This paper is the first study that has investigated the levels of DBDPE in the coastal sediments of China's Yellow Sea.

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Section: Concentrations and Comparisons With Other Studiessupporting

confidence: 88%

Polybrominated diphenyl ethers (PBDEs) and alternative brominated flame retardants (aBFRs) in sediments from four bays of the Yellow Sea, North China

Zhen

Tang

Xie

et al. 2016

Environmental Pollution

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“…They were also found in Hanoi road dust, at concentrations comparable to those from Chinese cities (Anh et al, 2018). Furthermore, a large PBDE monitoring study focusing on sediment samples collected from urban canals or rivers in Lao PDR, Cambodia, Vietnam, India, Indonesia, Thailand, the Philippines, Malaysia and Japan, including four samples from Hanoi, claimed that there was a relationship between the gross domestic product (GDP) per capita in emergent countries and SPBDE concentrations in urban river sediments (Kwan et al, 2013). The predominant congener in this study was BDE209 (43-97% of SPBDE), which was not analyzed in HCMC samples.…”

Section: Spahsmentioning

confidence: 96%

Where has the pollution gone? A survey of organic contaminants in Ho Chi Minh city / Saigon River (Vietnam) bed sediments

et al. 2019

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A wide range of persistent organic chemicals, including polychlorinated biphenyls (PCBs), polycyclic aromatic hydrocarbons (PAHs), some insecticides, as well as polybrominated diphenyl ethers (PBDEs) and some perfluoroalkyl substances (PFASs) were analyzed in 17 bed sediments collected along the Saigon River and at adjacent canal mouths from upstream to downstream in Ho Chi Minh City (Vietnam). Concentrations were rather low for PAHs, as well as for legacy PCBs and dichloro-diphenyl-trichlorethane and metabolites (DDTs), or below detection limits for several PFASs and all PBDEs measured. Several insecticides (chlorpyrifos-ethyl, and the pyrethroids cypermethrin and λ-cyhalothrin) displayed rather high concentrations at a few sites within the city. There was no distinct upstreamdownstream trend for PAHs, (DDTs) or PCBs. Although adjacent canal sediments tended to be more contaminated than Saigon River sediments, the differences were not significant. Emissions are almost certainly substantial for PAHs, and probably also for other contaminants such as PBDEs and some PFASs. During the dry season, contaminants are presumably stored in the city, either in canals or on urban surfaces. Heavy rainfall during the monsoon period carries away contaminated particle flows into the canals and then the Saigon River. The strong tidal influence in the river channel hinders the accumulation of contaminated particles. Contaminated deposits should accordingly be investigated further downstream in depositional environments, such as the mangrove.

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“…PBDE congeners are extremely persistent in soil and water, with half lives ranging from 10 to over 20 years, depending on the type of congener (Andrade et al 2010;Kim et al 2006). As a consequence, PBDEs have been detected globally in a variety of environmental samples, including air, soil, sediment, water, and biota (Jorundsdottir et al 2013;Kwan et al 2013;Stahl et al 2013;Syed et al 2013;Yang et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Characterization of the molecular degradation mechanism of diphenyl ethers by Cupriavidus sp. WS

Wang

Bai

Wang

et al. 2015

Environ Sci Pollut Res

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Commonly used flame retardants, such as polybrominated diphenyl ethers, are extremely persistent in the environment, causing serious environmental risks. Certain strains of bacteria are able to degrade several low brominated congeners of PBDEs aerobically. However, the aerobic degradation pathway is not yet well understood, particularly at the genetic level. In this study, we isolated Cupriavidus sp. WS from the environment that could degrade diphenyl ether (DE), 4-bromodiphenyl ether, and 4,4'-bromodiphenyl ether. DE was completely degraded in 6 days without any detectable end-product. Using transposon mutagenesis, several DE degradation-deficient mutants were obtained. Knocking out bphA1, bphA2, and bphA3 eliminated the ability of the Cupriavidus sp. WS bacterium to degrade DE, indicating that the bph genes play a crucial role in DE degradation by this strain. The specific roles of bphA, bphB, and bphC were identified by systematically expressing these genes in Escherichia coli. The dihydrodiol product of BphA was dehydrogenated into 2,3-dihydroxydiphenyl ether by BphB. 2,3-Dihydroxydiphenyl ether was then decomposed into phenol and 2-pyrone-6-carboxylic acid by BphC. Thus, BphA, BphB, and BphC act sequentially in the aerobic degradation of DE, 4-bromodiphenyl ether, and 4,4'-dibromodiphenyl ether by the Cupriavidus sp. WS bacterium.

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Sedimentary PBDEs in urban areas of tropical Asian countries

Cited by 34 publications

References 39 publications

Polybrominated diphenyl ethers (PBDEs) and alternative brominated flame retardants (aBFRs) in sediments from four bays of the Yellow Sea, North China

Polybrominated diphenyl ethers (PBDEs) and alternative brominated flame retardants (aBFRs) in sediments from four bays of the Yellow Sea, North China

Where has the pollution gone? A survey of organic contaminants in Ho Chi Minh city / Saigon River (Vietnam) bed sediments

Characterization of the molecular degradation mechanism of diphenyl ethers by Cupriavidus sp. WS

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