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https://www.readbyqxmd.com/read/28063657/persistent-organic-pollutants-pops-in-the-atmosphere-of-three-chilean-cities-using-passive-air-samplers
#1
Karla Pozo, Germán Oyola, Victor H Estellano, Tom Harner, Anny Rudolph, Petra Prybilova, Petr Kukucka, Ondrej Audi, Jana Klánová, America Metzdorff, Silvano Focardi
In this study passive air samplers containing polyurethane foam (PUF) disks were deployed in three cities across Chile; Santiago (STG) (n=5, sampling sites), Concepciόn (CON) (n=6) and Temuco (TEM) (n=6) from 2008 to 2009. Polychlorinated biphenyls (PCBs) (7 indicator congeners), chlorinated pesticides hexachlorocyclohexanes (HCHs), dichlorodiphenyl trichloroethanes (DDTs) and flame retardants such as polybrominated diphenyl ethers (PBDEs) were determined by gas chromatography coupled mass spectrometry (GC/MS)...
January 4, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28056452/concentrations-of-organophosphorus-polybromobenzene-and-polybrominated-diphenyl-ether-flame-retardants-in-human-serum-and-relationships-between-concentrations-and-donor-ages
#2
Peng Li, Jun Jin, Ying Wang, Jicheng Hu, Meng Xu, Yiming Sun, Yulong Ma
Organophosphorus flame retardants, polybromobenzenes, and polybrominated diphenyl ethers (PBDEs) were determined in pooled human serum samples collected in an area in which these chemicals are produced in North China. Tri (2-chloroethyl) phosphate (TCEP) was found at a higher concentration than the other chemicals, and the mean TCEP concentration was 480.4 ng/g lipid. This is the first time TCEP has been detected in human serum from China. The PBDE concentration in serum was found to have decreased between 2007 and 2013...
December 27, 2016: Chemosphere
https://www.readbyqxmd.com/read/28034497/vertical-distribution-of-dehalogenating-bacteria-in-mangrove-sediment-and-their-potential-to-remove-polybrominated-diphenyl-ether-contamination
#3
Ying Pan, Juan Chen, Haichao Zhou, Shazia Farzana, Nora F Y Tam
The removal and degradation of polybrominated diphenyl ethers (PBDEs) in sediments are not clear. The vertical distribution of total and dehalogenating bacteria in sediment cores collected from a typical mangrove swamp in South China and their intrinsic degradation potential were investigated. These bacterial groups had the highest abundances in surface sediments (0-5cm). A 5-months microcosm experiment also showed that surface sediments had the highest rate to remove BDE-47 than deeper sediments (5-30cm) under anaerobic condition...
December 26, 2016: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28034496/antioxidative-response-of-kandelia-obovata-a-true-mangrove-species-to-polybrominated-diphenyl-ethers-bde-99-and-bde-209-during-germination-and-early-growth
#4
Shazia Farzana, Juan Chen, Ying Pan, Yuk-Shan Wong, Nora Fung Yee Tam
A 3-months microcosm experiment with mangrove sediment spiked with PBDEs and planted with propagules of Kandelia obovata was conducted to investigate PBDE toxicity and antioxidative responses of the germinated seedlings. BDE-99 suppressed germination rate, leaves formation and growth of mangrove seedlings. The leaves and roots of BDE-99 treated seedlings had significantly higher superoxide (O2(-)) release, malondialdehyde (MDA) and total polyphenol (TP) content, and peroxidase (POD) activity than the control...
December 26, 2016: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28031414/inhibition-of-the-human-abc-efflux-transporters-p-gp-and-bcrp-by-the-bde-47-hydroxylated-metabolite-6-oh-bde-47-considerations-for-human-exposure
#5
Satori A Marchitti, Christopher S Mazur, Caleb M Dillingham, Swati Rawat, Anshika Sharma, Jason Zastre, John F Kenneke
High body burdens of polybrominated diphenyl ethers (PBDEs) in infants and young children have led to increased concern over their potential impact on human development. PBDE exposure can alter the expression of genes involved in thyroid homeostasis, including those of ATP-binding cassette (ABC) transporters, which mediate cellular xenobiotic efflux. However, little information exists on how PBDEs interact with ABC transporters such as P-glycoprotein (P-gp) and breast cancer resistance protein (BCRP). The purpose of this study was to evaluate the interactions of 2,2',4,4'-tetrabromodiphenyl ether (BDE-47) and its hydroxylated metabolite 6-OH-BDE-47 with P-gp and BCRP, using human MDR1- and BCRP-expressing membrane vesicles and stably transfected NIH-3T3-MDR1 and MDCK-BCRP cells...
October 23, 2016: Toxicological Sciences: An Official Journal of the Society of Toxicology
https://www.readbyqxmd.com/read/28024741/characterization-of-pbdes-and-novel-brominated-flame-retardants-in-seawater-near-a-coastal-mariculture-area-of-the-bohai-sea-china
#6
Yan Wang, Xiaowei Wu, Hongxia Zhao, Qing Xie, Minmin Hou, Qiaonan Zhang, Juan Du, Jingwen Chen
The concentrations and distributions of PBDEs and novel brominated flame retardants (NBFRs) in dissolved phase of surface seawater near a coastal mariculture area of the Bohai Sea were investigated. The total concentrations of PBDE and NBFRs were in the range of 15.4-65.5 and 2.12-13.6ng/L, respectively. The highest concentration was discovered in the water near an anchorage ground, whereas concentrations in water samples from offshore cage-culture area were not elevated. Relatively high concentrations of BDE28, 99, and 100 were discovered in the medium range of distance from shore, where is the path of tidal or coastal current...
December 23, 2016: Science of the Total Environment
https://www.readbyqxmd.com/read/28019099/emissions-of-selected-semivolatile-organic-chemicals-from-forest-and-savannah-fires
#7
Xianyu Wang, Phong Thai, Marc Mallet, Maximilien Desservettaz, Darryl W Hawker, Melita Keywood, Branka Miljevic, Clare Paton-Walsh, Michael J Gallen, Jochen F Mueller
The emission factors (EFs) for a broad range of semivolatile organic chemicals (SVOCs) from subtropical eucalypt forest and tropical savannah fires were determined for the first time from in-situ investigations. Significantly higher (t test, P < 0.01) EFs (µg kg-1 dry fuel, gas + particle-associated) for polycyclic aromatic hydrocarbons (∑13 PAHs) were determined from the subtropical forest fire (7,000 ± 170) compared to the tropical savannah fires (1,600 ± 110), due to the approximately 60 fold higher EFs for 3-ring PAHs from the former...
December 26, 2016: Environmental Science & Technology
https://www.readbyqxmd.com/read/28006755/partitioning-of-polybrominated-biphenyl-ethers-from-mother-to-fetus-and-potential-health-related-implications
#8
Mei-Yun Zheng, Xing-Hong Li, Yun Zhang, You-Lin Yang, Wen-Yue Wang, Yuan Tian
Presently, knowledge on the partitioning of polybrominated biphenyl ethers (PBDEs) from mother to fetus and the relationship between PBDE exposure and the levels of thyroid hormones (THs) needs to be extended further. In the present study, we investigated the concentrations of PBDEs in paired mother-fetus samples from 72 pregnant women in Wenling, China. The detection of PBDE concentration suggested that the expectant women living in Wenling for over 20 years might be highly exposed to PBDEs, which is largely ascribed to e-waste recycling activities in the local environment...
December 10, 2016: Chemosphere
https://www.readbyqxmd.com/read/28006665/alteration-of-thyroid-hormone-concentrations-in-juvenile-chinook-salmon-oncorhynchus-tshawytscha-exposed-to-polybrominated-diphenyl-ethers-bde-47-and-bde-99
#9
Mary R Arkoosh, Ahna L Van Gaest, Stacy A Strickland, Greg P Hutchinson, Alex B Krupkin, Joseph P Dietrich
Polybrominated diphenyl ethers (PBDEs) have been used as flame-retardants in consumer products and are currently detected in salmon globally. The two most predominant PBDE congeners found in salmon are BDE-47 (2,2',4,4'-tetrabromodiphenyl ether) and BDE-99 (2,2',4,4',5-pentabromodiphenyl ether). In the present study, groups of juvenile Pacific Chinook salmon were fed five environmentally relevant concentrations of either BDE-47 (0.3-552 ng total PBDEs/g food), BDE-99 (0.3-580 ng total PBDEs/g food), or nearly equal mixtures of both congeners (0...
December 8, 2016: Chemosphere
https://www.readbyqxmd.com/read/28003438/bde-47-and-bde-49-inhibit-axonal-growth-in-primary-rat-hippocampal-neuron-glia-co-cultures-via-ryanodine-receptor-dependent-mechanisms
#10
Hao Chen, Karin M Streifel, Vikrant Singh, Dongren Yang, Linley Mangini, Heike Wulff, Pamela J Lein
Polybrominated diphenyl ethers (PBDEs) are widespread environmental contaminants associated with adverse neurodevelopmental outcomes in children and preclinical models; however, the mechanisms by which PBDEs cause developmental neurotoxicity remain speculative. The structural similarity between PBDEs and non-dioxin-like (NDL) polychlorinated biphenyls (PCBs) suggests shared toxicological properties. Consistent with this, both NDL PCBs and PBDEs have been shown to stabilize ryanodine receptors (RyRs) in the open configuration...
December 20, 2016: Toxicological Sciences: An Official Journal of the Society of Toxicology
https://www.readbyqxmd.com/read/28000443/predictors-of-serum-polybrominated-diphenyl-ether-pbde-concentrations-among-children-aged-1-5-years
#11
Lyndsey A Darrow, Melanie H Jacobson, Emma V Preston, Grace E Lee, Parinya Panuwet, Ronald E Hunter, M Elizabeth Marder, Michele Marcus, Dana B Barr
Serum concentrations of PBDEs were measured using gas chromatography-tandem mass spectrometry in 80 children aged 15-71 months. Demographic and behavioral data were collected on parental questionnaires; a research nurse recorded anthropometric measures and insurance status. For a subset of children (n = 17), PBDEs were measured in house dust and child handwipes sampled during a home visit. In linear and Tobit regression, log-transformed PBDE congeners were modeled as a function of child characteristics, including neighborhood-level socioeconomic indicators...
January 3, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/27999788/environmental-characteristics-of-polybrominated-diphenyl-ethers-in-marine-system-with-emphasis-on-marine-organisms-and-sediments
#12
REVIEW
Ying Zhang, Weiliang Wang, Jinming Song, Zongming Ren, Huamao Yuan, Huijun Yan, Jinpeng Zhang, Zhen Pei, Zhipeng He
Polybrominated diphenyl ethers (PBDEs), due to their widespread usage as flame retardants and their lipophilicity and persistence, have become ubiquitous in the environment. It is urgent to understand the environmental characteristics of PBDEs in marine system, but they have attracted little attention. We summarize the available data and analyze the regional distributions, controlling factors, and congener patterns of PBDEs in marine and associated environmental matrixes worldwide. Based on meta-analysis, after separating the estuarial sites from the marine sites, ignoring the extraordinary sample sites such as those located just near the point source, the PBDE concentration levels are still in the same order of magnitude from global scale...
2016: BioMed Research International
https://www.readbyqxmd.com/read/27993048/kinetics-of-brominated-flame-retardant-bfr-releases-from-granules-of-waste-plastics
#13
Bingbing Sun, Yuanan Hu, Hefa Cheng, Shu Tao
Plastic components of e-waste contain high levels of brominated flame retardants (BFRs), whose releases cause environmental and human health concerns. This study characterized the release kinetics of polybrominated diphenyl ethers (PBDEs) from millimeter-sized granules processed from the plastic exteriors of two scrap computer displays at environmentally relevant temperatures. The release rate of a substitute of PBDEs, 1,2-bis(2,4,6-tribromophenoxy)ethane (BTBPE), from the waste plastics, was reported for the first time...
December 20, 2016: Environmental Science & Technology
https://www.readbyqxmd.com/read/27989386/halogenated-flame-retardants-in-bobcats-from-the-midwestern-united-states
#14
Esmarie Boyles, Hongli Tan, Yan Wu, Clayton K Nielsen, Li Shen, Eric J Reiner, Da Chen
In response to the restrictions of polybrominated diphenyl ether (PBDE) flame retardants in various consumer products, alternative halogenated flame retardants have been subjected to increased use. Compared to aquatic ecosystems, relatively little information is available on the contamination of alternative flame retardants in terrestrial ecosystems, especially with regards to mammalian wildlife. In this study we used a top terrestrial carnivore, the bobcat (Lynx rufus), as a unique biomonitoring species for assessing flame retardant contamination in the Midwestern United States (U...
February 2017: Environmental Pollution
https://www.readbyqxmd.com/read/27959529/correlation-between-atmospheric-boundary-layer-height-and-polybrominated-diphenyl-ether-concentrations-in-air
#15
Nguyen Thanh Dien, Yasuhiro Hirai, Shin-Ichi Sakai
In this study, we aim to determine the correlation between the height of the atmospheric boundary layer (ABL) and the concentrations of polybrominated diphenyl ether (PBDE) congeners, in an effort to improve comprehension of the atmospheric behavior of PBDEs. We used the PBDE data in air (n = 298), which were measured by the Japan Ministry of Environment (JMOE) at 50 sites across Japan during the period 2009-2012. The height of the ABL, which directly affects the PBDE concentrations in the near-surface air, was estimated by employing data retrieved from the Japanese global reanalysis (JRA-55) database, using the parcel and Richardson number method...
January 3, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/27939082/bioconcentration-of-polybrominated-diphenyl-ethers-and-organochlorine-pesticides-in-algae-is-an-important-contaminant-route-to-higher-trophic-levels
#16
Yao-Wen Qiu, Eddy Y Zeng, Hanlin Qiu, Kefu Yu, Shuqun Cai
Persistent organic pollutants (POPs) present in water may be bioconcentrated in phytoplankton and further transferred into higher trophic levels. In the present study, seawater, sediment, phytoplankton and macroalgae (Ulva lactuca L.) samples were collected from two estuarine bays in South China and analyzed for 24 polybrominated diphenyl ethers (PBDEs) and 22 organochlorine pesticides (OCPs). The concentrations of PBDE congeners except BDE-209 were low in both phytoplankton and Ulva. BDE-209 was the predominant congener in phytoplankton and Ulva, accounting for 89...
February 1, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/27907097/levels-of-selected-persistent-organic-pollutants-pcb-pbde-and-pesticides-in-honey-bee-pollen-sampled-in-poland
#17
Marek Łukasz Roszko, Marta Kamińska, Krystyna Szymczyk, Renata Jędrzejczak
Chemical plant protection is a commonly discussed factor potentially responsible for decline in pollinators and other beneficial insect populations. Various groups of chemicals including persistent organic pollutants could impact a bee colony's welfare and are reported to be present in bee tissue and apiary products. The aim of this work was to evaluate the presence of selected persistent organic pollutant and pesticide residues in bee pollen originating from different geographical regions of Poland. Pesticide residues were identified in 60% of tested bee pollen samples...
2016: PloS One
https://www.readbyqxmd.com/read/27900722/atmospheric-deposition-of-pbdes-and-dps-in-dongjiang-river-basin-south-china
#18
Xiaowei Wu, Yan Wang, Minmin Hou, Chunling Luo, Hongxia Zhao, Gan Zhang
The atmospheric deposition fluxes of polybrominated diphenyl ethers (PBDEs) and Dechlorane Plus (DPs) in Dongjiang River Basin of the Pearl River Delta in South China were investigated during winter and summer, respectively. The total deposition fluxes varied from 4.74 to 27.0 ng/m(2)/day for PBDEs and 8.77 to 206 ng/m(2)/day for DPs, respectively. The fractions of anti-DP to the total DPs (f anti) varied from 0.28 to 0.63 (mean = 0.43 ± 0.06), i.e., generally lower than those in commercial products, which might be attributed to the different environmental fates of the two isomers...
November 30, 2016: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/27898327/effects-of-three-different-embryonic-exposure-modes-of-2-2-4-4-tetrabromodiphenyl-ether-on-the-path-angle-and-social-activity-of-zebrafish-larvae
#19
Bin Zhang, Xiaoling Chen, Ruijie Pan, Ting Xu, Jing Zhao, Wenping Huang, Youyu Liu, Daqiang Yin
The toxicological research of polybrominated diphenyl ethers (PBDEs) has focused on its neurotoxicity; however, many questions still remain. For example, behavioral effects other than basic locomotion are seldom reported. To further evaluate the neurobehavioral toxicity of 2, 2', 4, 4'-tetrabromodiphenyl ether (BDE-47), a typical PBDE congener in animal tissues, we employed three different exposure modes, namely, continuous, early pulse, and interval exposure, to investigate the path angle and social activity changes of zebrafish larvae exposed to BDE-47 using automated equipment (Zebrabox)...
February 2017: Chemosphere
https://www.readbyqxmd.com/read/27885579/an-integrated-assessment-of-pollution-and-biological-effects-in-flounder-mussels-and-sediment-in-the-southern-baltic-sea-coastal-area
#20
Henryka Dabrowska, Orest Kopko, Kari K Lehtonen, Thomas Lang, Ilona Waszak, Maija Balode, Evita Strode
Organic and metal contaminants and biological effects were investigated in flounder, mussels, and sediments in the southern Baltic Sea coastal area in order to assess environmental quality status in that area. Four sites were selected, including two within the Gulf of Gdańsk (GoG). In biota and sediment at each site, DDTs dominated over PCBs and PBDEs were the least abundant among organic contaminants. Their concentrations decreased progressively outward from GoG. Among metal contaminants, the levels of Hg, Pb, and Cd were elevated in GoG...
November 24, 2016: Environmental Science and Pollution Research International
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