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Flame study

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https://www.readbyqxmd.com/read/28636346/halogenated-flame-retardants-in-predator-and-prey-fish-from-the-laurentian-great-lakes-age-dependent-accumulation-and-trophic-transfer
#1
Guanyong Su, Robert J Letcher, Daryl McGoldrick, Sean M Backus
The identification, persistence, accumulation and trophic transfer of 25 polybrominated diphenyl ether (PBDE) congeners, 23 non-PBDE halogenated flame retardants (NPHFRs), 4 polybrominated-diphenoxybenzenes (PB-DiPhOBzs) and 6 methoxylated (MeO-) PB-DiPhOBzs were investigated in predator and prey fish collected in 2010 from sites in the North American Great Lakes of Ontario (n=26) and Erie (n=39). Regardless of locations or species, 20 PBDEs and 12 NPHFRs were quantifiable in at least one of the 65 analyzed samples, and polybrominated-1,4-diphenoxybenzenes (PB-DiPhOBzs) and MeO-PB-DiPhOBzs were not detectable in any of analyzed samples...
June 21, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28636053/evidence-of-bad-recycling-practices-bfrs-in-children-s-toys-and-food-contact-articles
#2
A Guzzonato, F Puype, S J Harrad
Brominated flame retardants (BFRs) have been used intentionally in a wide range of plastics, but are now found in an even wider range of such materials (including children's toys and food contact articles) as a result of recycling practices that mix BFR-containing waste plastics with "virgin" materials. In this study Br was quantified in toy and food contact samples on the assumption that its concentration can be used as a metric for BFR contamination. Subsequently, compound specific determination of BFRs was performed to evaluate the validity of the aforementioned assumption, crucial to render rapid, inexpensive, in situ Br determination in non-laboratory environments (such as waste handling facilities) a viable option for sorting wastes according to their BFR content...
June 21, 2017: Environmental Science. Processes & Impacts
https://www.readbyqxmd.com/read/28635272/efficient-flame-retardant-and-smoke-suppression-properties-of-mg-al-layered-double-hydroxide-nanostructures-on-wood-substrate
#3
Bingtuo Guo, Yongzhuang Liu, Qi Zhang, Fengqiang Wang, Qingwen Wang, Yixing Liu, Jian Li, Haipeng Yu
Improving the flame retardancy of wood is an imperative, yet highly challenging step in the application of wood in densely populated spaces. In this study, Mg-Al layered double hydroxide (LDH) coating was successfully fabricated on a wood substrate to confer flame-retardant and smoke-suppression properties. The chemical compositions and bonding states characterized by energy-dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy confirmed the coating constituents of Mg-Al LDH. The coating evenly covered the sample wood surfaces and provided both mechanical enhancement and flame-retardancy effects...
June 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28633947/occurrence-and-spatial-distribution-of-organophosphorus-flame-retardants-and-plasticizers-in-the-bohai-and-yellow-seas-china
#4
Mingyu Zhong, Jianhui Tang, Lijie Mi, Fei Li, Runmei Wang, Guopei Huang, Huifeng Wu
Seawater samples from 50 sites in the BS and YS were collected to investigate the spatial distribution of 7 OPs. Concentrations of the total OPs (ƩOPs) in the BS and YS ranged from 8.12ngL(-1) to 98.04ngL(-1) with a geometric mean (GM) of 23.70ngL(-1). Tris(1-chloro-2-propyl) phosphate (TCPP) was the dominant compound, followed by tris(2-chloroethyl) phosphate (TCEP) and triphenylphosphine oxide (TPPO). The ƩOPs together with the most commonly detected individual OPs (TCPP, TCEP, tris(1,3-dichloro-2-propyl) phosphate (TDCPP), tri-iso-butyl phosphate (TiBP), triphenyl phosphate (TPhP), and TPPO) tended to decrease from nearshore to offshore and from the surface to the bottom seawaters, indicating major land-based sources...
June 17, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28633110/emerging-contaminants-related-to-the-occurrence-of-forest-fires-in-the-spanish-mediterranean
#5
Julian Campo, María Lorenzo, Erik L H Cammeraat, Yolanda Picó, Vicente Andreu
Forest fires can be a source of contamination because, among others, of the use of chemicals to their extinction (flame retardants, FRs), or by the production of Polycyclic Aromatic Hydrocarbons (PAHs) derived from high temperature alteration of organic matter. Up to our knowledge, this study is the first to assess the direct (PAHs 16 on the USA EPA's priority list), and indirect [tri- to hepta- brominated diphenyl ethers (PBDEs), organophosphorus flame retardants (PFRs) and perfluoroalkyl substances (PFASs)] contamination related to forest fires...
June 17, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28625681/variation-of-calcium-copper-and-iron-levels-in-serum-bile-and-stone-samples-of-patients-having-different-types-of-gallstone-a-comparative-study
#6
Mustafa Khan, Tasneem Gul Kazi, Hasan Imran Afridi, Sirajuddin, Muhammad Bilal, Asma Akhtar, Sabir Khan, Salma Kadar
BACKGROUND: Epidemiological data among the human population has shown a significantly increased incidence of gallstone (GS) disease worldwide. It was studied that some essential (calcium) and transition elements (iron and copper) in bile play an important role in the development of GS. METHOD: The estimation of calcium, copper and iron were carried out in the serum, gall bladder bile and different types of GS (cholesterol, mixed and pigmented) of 172 patients, age ranged 20-55years...
June 15, 2017: Clinica Chimica Acta; International Journal of Clinical Chemistry
https://www.readbyqxmd.com/read/28624943/hexabromocyclododecane-diastereomers-in-fish-and-suspended-particulate-matter-from-selected-european-waters-trend-monitoring-and-environmental-quality-standard-compliance
#7
Heinz Rüdel, Josef Müller, Jens Nowak, Mathias Ricking, Roland Klein, Matthias Kotthoff
The brominated flame retardant hexabromocyclododecane (HBCD) was monitored in fish and sediment (from one lake) or suspended particulate matter (SPM; from five rivers) at European freshwater sites to study the effects of reduction measures implemented by HBCD producers and users in recent years. Bream (Abramis brama) were sampled annually between 2007 and 2013 in the rivers Götaälv/SE, Rhône/FR, Western Scheldt/NL, Mersey/UK, and Tees/UK and in Lake Belau/DE. Sediment/SPM was taken every second year between 2008 and 2014...
June 17, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28623655/the-thin-layer-microchromatography-%C3%AE-tlc-and-tlc-fid-technique-as-a-new-methodology-in-the-study-of-lubricating-oils
#8
Paulina Nowak, Judyta Kosińska, Marta Glinka, Marian Kamiński
This paper concerns the possibility of using TLC coupled with a flame ionization detector (FID) and micro-TLC (μTLC) asprecursors for microfluidized devices of analytical techniques to identify and determine the presence and content of the petroleum/vegetable oil base in the lubricating oils applied in cutting devices (chainsaws). This research is related to the problem of ensuring, in compliance with the requirements of environmental protection, a sufficient level of biodegradability of lubricating oils emitted to the environment during operation of equipment lubricated with these oils...
June 16, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28621921/a-novel-polymer-aerogel-towards-high-dimensional-stability-mechanical-property-and-fire-safety
#9
Ke Shang, Jun-Chi Yang, Zhijie Cao, Wang Liao, Yu-Zhong Wang, David A Schiraldi
Inorganic silica-based aerogels, earliest and widely-used aerogels, have poorer mechanical properties than their organic substitutes, which are flammable. In this study, a novel polymeric aerogel with high strength, inherent flame retardancy and cost-effectiveness, which is based on poly(vinyl alcohol) (PVA) crosslinked with melamine-formaldehyde (MF), was prepared under aqueous condition with an eco-friendly freeze-drying and post-curing process. Combined with the additional rigid MF network and benifited from the resulting unique infrastructure of inter-crosslinked flexible PVA segments and rigid MF segments, PVA-based aerogels exibited a significantly decreased degradation rate, and sharply decreased peak heat release rate (PHRR) in cone calorimeter tests (by as much as 83%) compared with neat PVA...
June 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28620860/currently-used-organophosphate-and-brominated-flame-retardants-in-the-environment-of-china-and-other-developing-countries-2000-2016
#10
Nadeem Ali, Khurram Shahzad, Muhammad Imtiaz Rashid, Heqing Shen, Iqbal Mohammad Ibrahim Ismail, Syed Ali Musstjab Akber Shah Eqani
This review summarizes the environmental occurrence of new brominated flame retardants (NBFRs) and organophosphate compounds (OPs) in the environment of developing countries since 2000. The ban on the production and use of commercial formulations of polybrominated diphenyl ethers (PBDEs) have paved the way for the high use of NBFRs and OPs in consumer products to fulfill the fire safety regulations. Recent studies have shown that the ever increasing production volumes and extensive use of these chemicals as additive FRs and plasticizers have resulted into their ubiquitous occurrence in all environmental compartments...
June 16, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28620829/appearance-of-cell-adhesion-factor-in-osteoblast-proliferation-and-differentiation-of-apatite-coating-titanium-by-blast-coating-method
#11
Hirotsugu Umeda, Takamitsu Mano, Koji Harada, Ferdous Tarannum, Yoshiya Ueyama
We have already reported that the apatite coating of titanium by the blast coating (BC) method could show a higher rate of bone contact from the early stages in vivo, when compared to the pure titanium (Ti) and the apatite coating of titanium by the flame spraying (FS) method. However, the detailed mechanism by which BC resulted in satisfactory bone contact is still unknown. In the present study, we investigated the importance of various factors including cell adhesion factor in osteoblast proliferation and differentiation that could affect the osteoconductivity of the BC disks...
August 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28620612/potential-role-of-pet-cats-as-a-sentinel-species-for-human-exposure-to-flame-retardants
#12
Luis A Henríquez-Hernández, Elena Carretón, María Camacho, José Alberto Montoya-Alonso, Luis D Boada, Verónica Bernal Martín, Yaiza Falcón Cordón, Soraya Falcón Cordón, Manuel Zumbado, Octavio P Luzardo
Flame retardants are a wide group of chemicals used by the industry to avoid combustion of materials. These substances are commonly found in plastics, electronic equipment, fabrics, and in many other everyday articles. Subsequently, ubiquitous environmental contamination by these common chemical is frequently reported. In the present study, we have evaluated the level of exposure to polychlorinated biphenyls (PCBs), brominated diphenyl ethers (BDEs), and organophosphorous flame retardants (OPFRs) in pet cats through the analysis of their serum...
2017: Frontiers in Veterinary Science
https://www.readbyqxmd.com/read/28618092/a-platinized-stainless-steel-fiber-with-in-situ-coated-polyaniline-polypyrrole-graphene-oxide-nanocomposite-sorbent-for-headspace-solid-phase-microextraction-of-aliphatic-aldehydes-in-rice-samples
#13
Alireza Ghiasvand, Afagh Nasirian, Samira Koonani, Kolsoum Nouriasl
The surface of a stainless steel fiber was made larger, porous and cohesive by platinizing for tightly attachment of its coating. Then, it was coated by a polyaniline/polypyrrole/graphene oxide (PANI/PP/GO) nanocomposite film using electrochemical polymerization (EP) process. The prepared PANI/PP/GO fiber was used for headspace solid-phase microextraction (HS-SPME) of linear aliphatic aldehydes in rice samples followed by gas-chromatography flame ionization detector (GC-FID) determination. To achieve the highest extraction efficiency, various experimental parameters including extraction time and temperature, matrix modifier, and desorption condition were studied...
June 15, 2017: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/28618081/loss-of-the-ssra-genome-island-led-to-partial-debromination-in-the-pbde-respiring-dehalococcoides-mccartyi-strain-gy50
#14
Chang Ding, Matthew J Rogers, Kun-Lin Yang, Jianzhong He
Polybrominated diphenyl ethers (PBDEs), chemicals commonly used as flame-retardants in consumer products, are emerging persistent organic pollutants that are ubiquitous in the environment. In this study, we report the PBDE-respiring isolate - Dehalococcoides mccartyi strain GY50, which debrominates the most toxic tetra- and penta-BDE congeners (∼1.4 µM) to diphenyl ether within 12 days with hydrogen as the electron donor. The complete genome sequence revealed 26 reductive dehalogenase homologous genes (rdhAs), among which three genes (pbrA1, pbrA2, and pbrA3) were highly expressed during PBDE debromination...
June 15, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/28611054/cooking-methods-for-red-meats-and-risk-of-type-2-diabetes-a-prospective-study-of-u-s-women
#15
Gang Liu, Geng Zong, Frank B Hu, Walter C Willett, David M Eisenberg, Qi Sun
OBJECTIVE: This study examined different cooking methods for red meats in relation to type 2 diabetes (T2D) risk among U.S. women who consumed red meats regularly (≥2 servings/week). RESEARCH DESIGN AND METHODS: We monitored 59,033 women (1986-2012) aged 30-55 years and free of diabetes, cardiovascular disease, and cancer at baseline when information on frequency of different cooking methods for red meats, including broiling, barbequing, roasting, pan-frying, and stewing/boiling, was collected...
June 13, 2017: Diabetes Care
https://www.readbyqxmd.com/read/28609849/legacy-and-emerging-halogenated-flame-retardants-in-the-middle-and-lower-stream-of-the-yellow-river
#16
Xianfa Su, Qilu Li, Jinglan Feng, Liya Guo, Jianhui Sun
Halogenated flame retardants (HFRs), mainly encompassing polybrominated diphenylethers (PBDEs), dechlorane plus (DP) and emerging bromine flame retardants (EBFRs), are widely employed nowadays in daily lives. However, limited knowledge has been gained to date on the concentrations and distributions of HFRs in particular within certain regions. In the present study, legacy and emerging HFRs were systematically measured in suspended particle matter (SPM) and sediments collected in 2014 from the middle and lower reach of the Yellow River in Henan province...
June 9, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28609175/center-for-the-polyurethanes-industry-summary-of-unpublished-industrial-hygiene-studies-related-to-the-evaluation-of-emissions-of-spray-polyurethane-foam-insulation
#17
Richard D Wood
Spray polyurethane foam (SPF) insulation is used as thermal insulation for residential and commercial buildings. It has many advantages over other forms insulation; however, concerns have been raised related to chemical emissions during and after application. The American Chemistry Council's (ACC's) Center for the Polyurethanes Industry (CPI) has gathered previously unpublished industrial hygiene air sampling studies submitted by member companies that were completed during an eight year period from 2007 to 2014...
June 13, 2017: Journal of Occupational and Environmental Hygiene
https://www.readbyqxmd.com/read/28606574/dietary-habits-concentration-of-copper-zinc-and-cu-to-zn-ratio-in-serum-and-ability-status-of-patients-with-relapsing-remitting-multiple-sclerosis
#18
Katarzyna Socha, Elżbieta Karpińska, Jan Kochanowicz, Jolanta Soroczyńska, Marta Jakoniuk, Marianna Wilkiel, Zenon D Mariak, Maria H Borawska
OBJECTIVE: Dietary habits and adequate intake of antioxidants in the diet-for example, copper (Cu) and zinc (Zn)-may be an environmental factor in the occurrence of multiple sclerosis (MS). The aim of this study was to estimate the influence of dietary habits on the concentration of Cu, Zn in the serum, and the effect of Cu-to-Zn ratio on the ability status of patients with relapsing-remitting MS. METHODS: This was an observational case-control study that included 101 individuals with MS and 68 healthy individuals (controls)...
July 2017: Nutrition
https://www.readbyqxmd.com/read/28605836/brominated-flame-retardants-in-marine-environment-focused-on-aquaculture-area-occurrence-source-and-bioaccumulation
#19
Seo-Yeon Gu, Kalu Ibe Ekpeghere, Hee-Young Kim, In-Seok Lee, Da-Hye Kim, Gyojin Choo, Jeong-Eun Oh
Brominated flame retardants (BFRs), including polybrominated diphenyl ethers (PBDEs), tetrabromobisphenol A (TBBPA), and hexabromocyclododecanes (HBCDs), were investigated in bivalve (i.e., oyster (Crassostrea gigas) and mussel (Mytilus coruscus)), sediment, and seawater samples collected from aquaculture areas in South Korea to identify their occurrence, sources, and bioaccumulation. Among the studied chemicals, HBCDs predominated in bivalves and sediment, with concentrations of ND-67.52ng/g lipid weight and 3...
June 6, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28604253/polybrominated-diphenyl-ethers-pbdes-in-u-s-meat-and-poultry-2012-2013-levels-trends-and-estimated-consumer-exposures
#20
Sara J Lupton, Heldur Hakk
Polybrominated diphenyl ethers (PBDEs) are a class of brominated flame retardants whose use has contaminated foods and caused subsequent human exposures. To address the issue of possible human exposure, samples from a 2012-13 U.S. meat and poultry (beef, pork, chicken, turkey) study were analyzed for seven PBDEs. The mean summed concentrations of the 7 BDE congeners (ΣPBDE) from beef, pork, chicken, and turkey were 0.40, 0.36, 0.19, and 0.76 ng/g lipid weight (lw). The range of ΣPBDEs for all meat classes was 0...
June 12, 2017: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
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