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Flame study

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https://www.readbyqxmd.com/read/29787900/associations-between-prenatal-and-childhood-pbde-exposure-and-early-adolescent-visual-verbal-and-working-memory
#1
Whitney J Cowell, Amy Margolis, Virginia A Rauh, Andreas Sjödin, Richard Jones, Ya Wang, Wanda Garcia, Frederica Perera, Shuang Wang, Julie B Herbstman
BACKGROUND: Prenatal and childhood exposure to polybrominated diphenyl ether (PBDE) flame retardants has been inversely associated with cognitive performance, however, few studies have measured PBDE concentrations in samples collected during both prenatal and postnatal periods. METHODS: We examined prenatal (cord) and childhood (ages 2, 3, 5, 7 and 9 years) plasma PBDE concentrations in relation to memory outcomes assessed between the ages of 9 and 14 years...
May 19, 2018: Environment International
https://www.readbyqxmd.com/read/29787899/dermal-contact-with-furniture-fabrics-is-a-significant-pathway-of-human-exposure-to-brominated-flame-retardants
#2
Mohamed Abou-Elwafa Abdallah, Stuart Harrad
Despite extensive application in consumer products and concerns over their adverse health effects, how external exposure to brominated flame retardants (BFRs) contributes to their human body burdens is not yet fully understood. While recent studies focused on inadvertent indoor dust ingestion and diet as potential major pathways of exposure, dermal uptake has been largely overlooked. We provide the first experimentally-based assessment of dermal uptake of BFRs via contact with indoor dust and flame-retarded furniture fabrics...
May 19, 2018: Environment International
https://www.readbyqxmd.com/read/29784341/middle-distillates-hydrogen-content-via-gc%C3%A3-gc-fid
#3
Petr Vozka, Huaping Mo, Pavel Šimáček, Gozdem Kilaz
Liquid transportation fuels in the middle distillate range contain thousands of hydrocarbons making the predictions and calculations of properties from composition a challenging process. We present a new approach of hydrogen content determination by comprehensive two-dimensional gas chromatography with flame ionization detector (GC×GC-FID) using a weighted average method. GC×GC-FID hydrogen determination precision was excellent (0.005 wt% repeatability). The method accuracy was evaluated by high-resolution nuclear magnetic resonance (NMR) technique, which is non-biased, measures the H signal directly and was independently validated by controls in the current study...
August 15, 2018: Talanta
https://www.readbyqxmd.com/read/29783866/effect-of-the-flame-retardant-tris-1-3-dichloro-2-propyl-phosphate-tdcpp-on-na-k-atpase-and-cl-transport-in-hela-cells
#4
Simona Latronico, Maria Elena Giordano, Emanuela Urso, Maria Giulia Lionetto, Trifone Schettino
Tris (1, 3-dichloro-2-propyl) phosphate (TDCPP) is one of the most diffused phosphorus flame retardants in the environment and is highly persistent and abundant in residential dust samples. To date the cellular targets and mechanisms underlying its toxic effects are not completely understood. The aim of this work was to study the effects of TDCPP on ion transport mechanisms fundamental for the cellular ionic homeostasis, such as Na+ -K+ -ATPase and Cl- transport. HeLa cells were used as experimental model. TDCPP showed a dose-dependent effect on cell viability in cells exposed for 24h as assessed by MTT test (IC50 = 52...
May 21, 2018: Toxicology Mechanisms and Methods
https://www.readbyqxmd.com/read/29782897/metal-concentrations-in-fillet-and-gill-of-parrotfish-scarus-ghobban-from-the-persian-gulf-and-implications-for-human-health
#5
Yadolah Fakhri, Narottam Saha, Ali Miri, Aziz Rahimizadeh, Laleh Roomiani, Mansour Ghaderpoori, Mahmoud Taghavi, Hassan Keramati, Zohreh Bahmani, Bigard Moradi, Nazak Amanidaz
Despite the benefits of seafood's consumption, the bioaccumulation of metals in fish can endanger consumers' health. This study analyzed lead (Pb), mercury (Hg), Arsenic (As), and Cadmium (Cd) concentrations in fillet and gill of parrotfish (Scarus ghobban) using flame atomic adsorption spectroscopy (FAAS). The potential non-carcinogenic and carcinogenic health risks due to consumption of Scarus ghobban fillet were assessed by estimating average target hazard quotient (THQ) and total target hazard quotient (TTHQ) and Incremental Lifetime Cancer Risk cancer risk (ILCR) of the analyzed metals...
May 18, 2018: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/29781773/a-comparison-of-total-inward-leakage-measured-using-sodium-chloride-nacl-and-corn-oil-aerosol-methods-for-air-purifying-respirators
#6
Samy Rengasamy, Ziqing Zhuang, George Niezgoda, Gary Walbert, Robert Lawrence, Brenda Boutin, Judith Hudnall, William P Monaghan, Michael Bergman, Colleen Miller, James Harris, Christopher Coffey
The International Organization for Standardization (ISO) standard 16900-1:2014 specifies the use of sodium chloride (NaCl) and corn oil aerosols, and sulfur hexafluoride gas for measuring total inward leakage (TIL). However, a comparison of TIL between different agents is lacking. The objective of this study was to measure and compare TIL for respirators using corn oil and NaCl aerosols. TIL was measured with 10 subjects donning two models of filtering facepiece respirators (FFRs) including FFP1, N95, P100, and elastomeric half-mask respirators (ERs) in NaCl and corn oil aerosol test chambers, using continuous sampling methods...
May 21, 2018: Journal of Occupational and Environmental Hygiene
https://www.readbyqxmd.com/read/29778830/wearable-camera-derived-microenvironments-in-relation-to-personal-exposure-to-pm-2-5
#7
Maëlle Salmon, Carles Milà, Santhi Bhogadi, Srivalli Addanki, Pavitra Madhira, Niharika Muddepaka, Amaravathi Mora, Margaux Sanchez, Sanjay Kinra, V Sreekanth, Aiden Doherty, Julian D Marshall, Cathryn Tonne
Data regarding which microenvironments drive exposure to air pollution in low and middle income countries are scarce. Our objective was to identify sources of time-resolved personal PM2.5 exposure in peri-urban India using wearable camera-derived microenvironmental information. We conducted a panel study with up to 6 repeated non-consecutive 24 h measurements on 45 participants (186 participant-days). Camera images were manually annotated to derive visual concepts indicative of microenvironments and activities...
May 17, 2018: Environment International
https://www.readbyqxmd.com/read/29778681/portable-x-ray-fluorescence-for-the-detection-of-pop-bfrs-in-waste-plastics
#8
Martin Sharkey, Mohamed Abou-Elwafa Abdallah, Daniel S Drage, Stuart Harrad, Harald Berresheim
The purpose of this study was to establish the efficacy of portable X-ray fluorescence (XRF) instrumentation as a screening tool for a variety of end of life plastics which may contain excess amounts of brominated flame retardants (BFRs), in compliance with European Union (EU) and United Nations Environment Programme (UNEP) legislative limits (low POP concentration limits - LPCLs). 555 samples of waste plastics were collected from eight waste and recycling sites in Ireland, including waste electrical and electronic equipment (WEEE), textiles, polyurethane foams (PUFs), and expanded polystyrene foams...
May 17, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29778164/monitoring-of-943-organic-micropollutants-in-wastewater-from-municipal-wastewater-treatment-plants-with-secondary-and-advanced-treatment-processes
#9
Juan Wang, Zhe Tian, Yingbin Huo, Min Yang, Xingcan Zheng, Yu Zhang
To perform a systematic survey on the occurrence and removal of micropollutants during municipal wastewater treatment, 943 semi-volatile organic chemicals in 32 wastewater samples including influents of secondary treatments, secondary effluents and final effluents (effluents of advanced treatments), which were collected from seven full-scale municipal wastewater treatment plants (MWTPs) in China, were examined by gas chromatography-mass spectrometry (GC-MS) coupled with an automated identification and quantification system with a database (AIQS-DB)...
May 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/29777525/preconcentration-and-determination-of-trace-nickel-and-cobalt-in-milk-based-samples-by-ultrasound-assisted-cloud-point-extraction-coupled-with-flame-atomic-absorption-spectrometry
#10
Nuket Kartal Temel, Kadriye Sertakan, Ramazan Gürkan
In this study, ultrasound-assisted cloud point extraction (UA-CPE) method was developed for the determination of Ni(II) and Co(II) in milk-based products. After extraction and preconcentration, the Ni(II) and Co(II) contents of samples were determined by flame atomic absorption spectrometry (FAAS). After their complexation with hydroxy naphthol blue (HNB) in the presence of cationic surfactant, CTAB at pH 4.0, the Ni(II) and Co(II) were taken within the micellar phase of nonionic surfactant, TX-114. The micellar phase containing the analytes were diluted to a volume of 0...
May 18, 2018: Biological Trace Element Research
https://www.readbyqxmd.com/read/29774514/summary-of-historical-terrestrial-toxicity-data-for-the-brominated-flame-retardant-tetrabromobisphenol-a-tbbpa-effects-on-soil-microorganisms-earthworms-and-seedling-emergence
#11
Klaus P Rothenbacher, Alison M Pecquet
This article summarizes historical and recent research on the terrestrial toxicology of tetrabromobisphenol A (TBBPA). Despite its ubiquitous use and presence in the environment, little published data is available to evaluate the terrestrial ecotoxicity of TBBPA. The purposes of this paper are to enable broad access to a series of TBBPA ecotoxicity tests (nitrogen transformation, earthworm survival/reproduction, and seedling emergence/growth) that were conducted in support of regulatory risk assessments, and to summarize available research in the terrestrial toxicity of TBBPA...
May 17, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29773182/essential-elements-in-synovial-fluid-samples-obtained-from-patients-living-in-northern-poland
#12
Pawel Konieczynski, Grzegorz Szreder, Ewelina Tamowska, Marek Wesolowski
Many people after 50 year of life suffer pains caused by osteoarthritis (OA), which make their life difficult and painful. There is a probable association of OA with the concentration of certain elements in body fluids. Therefore the aim of the study was to relate the level of essential elements in synovial fluids of patients with OA with the treatment using antiarthritic drugs. Thus, flame-atomic absorption spectrometry was used to determine the concentrations of Fe, Zn, Cu, Mn, Na, K, Ca and Mg in 74 samples of synovial fluids taken from 36 patients...
July 2018: Journal of Trace Elements in Medicine and Biology
https://www.readbyqxmd.com/read/29772226/potential-role-of-peroxisome-proliferator-activated-receptor-gamma-activation-on-serum-visfatin-and-trace-elements-in-high-fat-diet-induced-type-2-diabetes-mellitus
#13
Arshia Tabassum, Syeda Nuzhat Fatima Zaidi, Kausar Yasmeen, Tabassum Mahboob
AIMS: Electrolytes and trace elements dysregulation play an important role in the progression of obesity and diabetes complications. The present study was designed to evaluate the insulin sensitizing effects of peroxisomes proliferators activated receptor gamma (PPAR-γ) agonist on trace elements in obesity induced type 2 diabetes mellitus and correlate with serum visfatin. MATERIALS AND METHODS: Wistar rats were categorized into five groups. Group I served as control; Group II fed on high fat diet (HFD); Group III fed on HFD and treated with rosiglitazone (3 mg/kg) for 7 days; Group IV were T2DM rats induce by HFD and low dose of streptozotocin (i...
May 14, 2018: Life Sciences
https://www.readbyqxmd.com/read/29771111/the-chemical-history-of-a-bubble
#14
Kenneth S Suslick, Nathan C Eddingsaas, David J Flannigan, Stephen D Hopkins, Hangxun Xu
Acoustic cavitation (the growth, oscillation, and rapid collapse of bubbles in a liquid) occurs in all liquids irradiated with sufficient intensity of sound or ultrasound. The collapse of such bubbles creates local heating and provides a unique source of energy for driving chemical reactions. In addition to sonochemical bond scission and formation, cavitation also induces light emission in many liquids. This phenomenon of sonoluminescence (SL) has captured the imagination of many researchers since it was first observed 85 years ago...
May 17, 2018: Accounts of Chemical Research
https://www.readbyqxmd.com/read/29765770/persistent-6-oh-bde-47-exposure-impairs-functional-neuronal-maturation-and-alters-expression-of-neurodevelopmentally-relevant-chromatin-remodelers
#15
Robert G Poston, Carissa J Dunn, Pushpita Sarkar, Ramendra N Saha
Polybrominated diphenyl ethers (PBDEs) are a pervasive class of brominated flame retardants that are present in the environment at particularly high levels, especially in the United States. Their environmental stability, propensity for bioaccumulation, and known potential for neurotoxicity has evoked interest regarding their effects on the developing nervous system. Exposure to PBDEs has been strongly associated with neurodevelopmental disorders. However, the details of their mechanistic roles in such disorders are incompletely understood...
January 2018: Environmental Epigenetics
https://www.readbyqxmd.com/read/29765695/influence-of-high-altitude-on-the-burning-behaviour-of-typical-combustibles-and-the-related-responses-of-smoke-detectors-in-compartments
#16
Ran Tu, Yi Zeng, Jun Fang, Yong-Ming Zhang
The effect of altitude on typical combustible burning and related smoke detector response signals was investigated by comparison experiments at altitudes of 40 m and 3650 m based on EN54 standard tests. Point-type light scattering photoelectric smoke detectors and ionization smoke detectors were used for four kinds of EN54 fire tests, including two kinds of smouldering fires with wood (test fire no. 2 in EN54 standard or TF2) and cotton (TF3), and two kinds of flaming fires with polyurethane (TF4) and n -heptane (TF5)...
April 2018: Royal Society Open Science
https://www.readbyqxmd.com/read/29763798/effect-of-blockage-ratios-on-the-characteristics-of-methane-air-explosion-suppressed-by-bc-powder
#17
Ligang Zheng, Gang Li, Yalei Wang, Xiaochao Zhu, Rongkun Pan, Yan Wang
To investigate the effect of blockage ratios on the explosion suppression by powder suppressant, an experimental study was performed to suppress the methane-air explosion in a 5L duct with different blockage ratios and various concentrations of BC dry powder. The results indicate that flames experienced both the spherical and finger-shaped stages. Furthermore, the smoothness of flame front initially decreased and then increased. Flame propagation velocities were higher with larger blockage ratios except for φ = 1...
April 27, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29761355/application-of-triolein-embedded-cellulose-acetate-membrane-tecam-passive-sampler-to-study-phase-distribution-of-hexabromocyclododecanes-hbcds-in-sediment
#18
Jianfeng Tang, Xinhu Li, Xinwei Yu, Gang Li, Sardar Khan, Chao Cai
Hexabromocyclododecanes (HBCDs) are a class of widely used brominated flame retardants (BFRs) that exhibit strong hydrophobicity. The ubiquity and persistence of HBCDs in sediment have attracted significant attention because of public health concerns. The environmental fate and ecological risks of HBCDs closely depend on their phase distribution in sediments. However, little information is available regarding the freely dissolved concentrations (C free ) of HBCDs in sediment porewater. In this study, we developed a method to measure C free of HBCDs in sediment porewater using triolein-embedded cellulose acetate membranes (TECAM)...
May 14, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29757971/comparison-of-the-conventional-and-electroenhanced-direct-immersion-solid-phase-microextraction-for-sampling-of-nicotine-in-biological-fluids-of-the-human-body
#19
Sana Abdolhosseini, Ali Reza Ghiasvand, Nahid Heidari
A stainless steel fiber was made porous and adhesive by platinization and then coated by nanostructured polypyrrole (PPy), using an appropriate electrophoretic deposition (EPD) method. The morphological surface structure and functional groups of the PPy-coated fiber were studied using SEM (Scanning electron microscope) instrument. The prepared fiber was used for comparison of direct immersion (DI) and electroenhanced direct immersion solid-phase microextraction (EE-DI-SPME) of nicotine in human plasma and urine samples followed by gas chromatography flame ionization detector (GC-FID) determination...
May 14, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29756186/polybrominated-diphenyl-ethers-in-cord-blood-and-perinatal-outcomes-from-laizhou-wan-birth-cohort-china
#20
Limei Chen, Caifeng Wang, Yan Zhang, Yijun Zhou, Rong Shi, Chang Cui, Yu Gao, Ying Tian
We explored whether polybrominated diphenyl ethers (PBDEs) exposed in cord blood could have any potential relationship with perinatal outcomes. Participants were pregnant females (n = 222) who were recruited from a prospective birth cohort (Laizhou Wan Birth Cohort, LWBC) between September 2010 and February 2012. We measured eight PBDE congeners (BDE-28, BDE-47, BDE-85, BDE-99, BDE-100, BDE-153, BDE-154, and BDE-183) in cord serum and examined their relationship with perinatal outcomes. The median levels of BDE-28, BDE-47, BDE-85, BDE-99, BDE-100, BDE-153, BDE-154, and BDE-183 were 2...
May 13, 2018: Environmental Science and Pollution Research International
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