Download or read book Assessment of Concentrations of Polybrominated Diphenyl Ether Flame Retardants in Indoor Environments in Australia written by Leisa Toms and published by . This book was released on 2006 with total page 57 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Assessment of Concentrations of Polybrominated Diphenyl Ether Flame Retardants in Aquatic Environments in Australia written by Leisa Toms and published by . This book was released on 2006 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Assessment of Concentrations of Polybrominated Diphenyl Ether Flame Retardants in the Australian Population written by Leisa Toms and published by . This book was released on 2006 with total page 71 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Brominated Flame Retardants written by Ethel Eljarrat and published by Springer. This book was released on 2011-04-15 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt: Brominated flame retardants are one of the last classes of halogenated compounds that are still being produced worldwide and used in large quantities in many applications. They are used in plastics, textiles, electronic circuitry, and other materials to prevent fires. This volume covers the state-of-the-art of the analysis, fate and behaviour of brominated flame retardants. Experts in the field provide an overview of the compounds’ physico-chemical properties and uses, their occurrence in the environment and biota, advanced chemical analytical methods, degradation studies, toxicological effects and human exposure. This book is a valuable and comprehensive source of information for environmental scientists interested in brominated flame retardant issues, and for authorities and producers.

Download or read book Global Contamination Trends of Persistent Organic Chemicals written by Bommanna G. Loganathan and published by CRC Press. This book was released on 2011-08-09 with total page 658 pages. Available in PDF, EPUB and Kindle. Book excerpt: Environmental pollution by man-made persistent organic chemicals (POCs) has been a serious global issue for over half a century. POCs are prevalent in air, water, soil, and organisms including wildlife and humans throughout the world. They do not degrade and cause long-term effect in organisms. Exposure to certain POCs may result in serious environmental and health effects including birth defects, diminished intelligence and certain types of cancers. Therefore, POCs have been the subject of an intensive regional, national and international effort to limit their production, use, and disposal of these chemical stocks. Trend monitoring studies are essential to make clear the behavior and fate of these compounds and to protect our environment and living resources. Global Contamination Trends of Persistent Organic Chemicals provides comprehensive coverage of spatial and temporal trends of classical and emerging contaminants in aquatic, terrestrial, and marine ecosystems, including the Arctic and Antarctic ecosystems. Compiled by an international group of experts, this volume covers: Spatial and temporal trends of polychlorinated biphenyls (PCBs), chlorinated pesticides, polychlorinated naphthalenes (PCNs), polychlorinated dibenzo-p-dioxins/furans (PCDD/DFs), polybrominated diphenyl ethers (PBDEs), hexabromocyclododecanes (HBCDs), perfluorinated compounds (PFCs), synthetic musks, polynuclear aromatic hydrocarbons (PAHs), and octyl- and nonylphenols Environmental and biological matrices used for the trend studies were atmosphere, water, soil, sediment, bivalve mollusks, fish, marine mammals, terrestrial mammals, and human breast milk Spatial and temporal trend studies presented from Australia, Brazil, China, Estonia, Ghana, Hong Kong, India, Italy, Japan, Korea, Norway, Poland, Sweden, the United States, coastal and open ocean environments, and the Arctic and Antarctic regions POCs have been the subject of an intensive regional, national, and international effort to limit their production and use, and to mitigate the disposal of these chemicals. Since POCs are prevalent in air, water, soil, and tissues of organisms (including wildlife and humans) throughout the world and do not degrade, they cause long-term effects in organisms. Trend monitoring studies are essential to make clear the behavior and fate of these compounds and to protect our environment and living resources. Relevant to professionals and students alike, Global Contamination Trends of Persistent Organic Chemicals facilitates the understanding of environmental and biological behavior of these chemicals and the development of strategies for protecting the global environment for future generations.

Download or read book Exposure of Humans to Polybrominated Diphenyl Ethers PBDEs Via Residential Indoor Environment in the U S written by Hua He and published by . This book was released on 2012 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Assesment of Concentrations of Polybrominated Diphenyl Etherflame Retardants in Aquatic Environments in Australia written by Leisa Toms and published by . This book was released on 2006 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Assessing Polybrominated Diphenyl Ethers PBDEs in Indoor Environments written by Jinyu Yang and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Assessing Exposure to Polybrominated Diphenyl Ethers PBDEs in the Home Environment written by Joseph Gardner Allen and published by . This book was released on 2008 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Polybrominated diphenyl ethers (PBDEs) are a class of toxic fire retardant compounds commonly used in household furniture and electronics. Human exposure to PBDEs primarily occurs in the indoor environment and levels in household dust have been linked to PBDE levels in breast milk. Further investigation of the home environment was necessary to improve our understanding of how PBDE sources contribute to personal exposure via both air and dust. In our first paper, we reported the first personal air concentrations of PBDEs in a non- occupational setting, and the first air concentrations in the United States. Further, we reported on BDE 209, a congener not widely reported in air. Concentrations of PBDEs were higher in personal air than in area air, particularly for the less volatile compounds, consistent with a personal cloud effect. We found that inhalation exposure may account for up to 22% of BDE 209 exposure in adults, far higher than previously estimated. Our second paper evaluated factors critical to assessing exposure to PBDEs in house dust. Concentrations of PBDEs in dust did not exhibit temporal variability over an 8-month period suggesting that cross-sectional sampling may be representative of exposure. Researcher-collected dust was up to 3.3 times higher, on average, than dust from the home vacuum bag. Concentrations of PBDEs in dust were significantly higher in the main living area compared with the bedroom, indicating spatial heterogeneity within homes. PBDE concentrations in air and dust were correlated, but only for the pentaBDE congeners and not decaBDE. Lastly, two dust exposure metrics (ng/g and ng/m 2) were strongly correlated, suggesting similar dust loadings across homes in our sample. In our final paper, we used X-ray fluorescence (XRF) to quantify bromine in consumer products and then relate those measures to room-specific concentrations of PBDEs in dust. In the validation phase, we demonstrated that XRF is a reliable predictor of bromine in products compared with GC/MS. In the field study phase, we found associations between XRF-measured bromine content in furniture and pentaBDE concentrations in dust from the same room. We also found that XRF-measured bromine levels in televisions were associated with decaBDE concentrations in dust, with the number of residents acting as an effect modifier.

Download or read book Emerging Halogenated Flame Retardants in the Environment written by and published by Elsevier. This book was released on 2020-02-14 with total page 387 pages. Available in PDF, EPUB and Kindle. Book excerpt: Analysis and Fate of Emerging Brominated and Fluorinated Organic Pollutants, Volume 87 in the Comprehensive Analytical Chemistry series, contains a wide range of topics on flame retardants in the environment, specifically focusing on halogenated flame retardants. New chapters in this release include an Introduction of emerging halogenated flame retardants in the environment, Analysis of emerging halogenated flame Retardants in environment, Toxicity of emerging halogenated organic chemicals, Occurrence and fate of emerging halogenated flame retardants in environment, Emerging halogenated flame retardants in indoor environment, Food contamination on emerging halogenated flame retardants, Human exposure to emerging halogenated flame retardants, and much more. Provides the current research results on emerging halogenated flame retardants Contains all research subjects about emerging halogenated flame retardants, from analysis to human exposure Presents critical information on halogenated flame retardants

Download or read book Assessing Exposure to Polybrominated Diphenyl Ethers and Polyfluorinated Compounds from Diet and the Indoor Environment written by Alicia June Fraser and published by . This book was released on 2010 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: This dissertation examines exposure of the general population to two classes of persistent organic pollutants, polybrominated diphenyl ethers (PBDEs) and polyfluorinated compounds (PFCs), both of which are used in consumer products. Exposure is known to occur in the indoor environment and via diet, though the relative contribution of different exposure pathways and microenvironments to human body burdens is poorly understood. Chapter 2 investigates the association between diet and serum concentrations of PBDEs in the general U.S. population The study sample consists of 1,971 participants of the 2003-2004 National Health and Nutrition Examination Survey. Using both a 24-hour food recall and a 1-year food frequency questionnaire, food categories were examined as predictors of five PBDEs (BDE-28, 47, 99, 100, and 153), and their sum (ΣPBDE) while adjusting for age, sex, race/ethnicity, income, and BMI. Consumption of poultry and red meat contributed significantly to PBDE body burdens and vegetarians had 25% lower ΣPBDE serum concentrations than omnivores. Chapters 3 and 4 investigate the role of indoor air and dust exposure to PFC body burdens among 31 individuals living and working in Boston, MA. Week-long, active air samples were collected from participant offices while dust samples were collected from offices, homes, and vehicles. Air samples were measured for the volatile PFC precursor compounds fluorotelomer alcohols (FTOHs), sulfonamides (FOSAs), and sulfonamidoethanols (FOSEs). Dust samples were analyzed for 19 PFCs, including perfluorooctanoate (PFOA), perfluorooctane sulfonate (PFOS), FTOHs, FOSAs, and FOSEs. Serum samples were also collected from participants and analyzed for eight PFCs including PFOA and PFOS. FTOH concentrations in office air, particularly 8:2-FTOH, were much higher than FOSAs and FOSEs, and varied by building with the highest levels observed in a newly constructed and newly furnished building. FTOHs in air were significantly associated with PFOA in serum. PFOS in serum was not associated with air levels of FOSAs/FOSEs. PFC concentrations in dust varied by microenvironment and, in general, were found to be highest in offices and not associated with PFCs in serum. In conclusion, diet is an important exposure pathway for PBDEs, and office air may be an important contributor to PFOA body burden.

Download or read book Inhalation Exposure Pathways for Polybrominated Diphenyl Ethers written by Scot Waye and published by . This book was released on 2008 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many chemicals off-gas or leech into indoor environments from sources such as consumer products, furnishings, and building materials. An understanding of the pathways from the sources to human exposure is vital in order to implement control strategies and lower exposure. Objects containing Brominated flame retardants (BFRs), one class of semivolatile organic compounds (SVOCs), burn more slowly during combustion. BFRs, especially polybrominated diphenyl ethers (PBDEs), are used in electronic devices including casings and circuit boards. Heat from internal circuitry increases the BFR vapor pressure and the partition coefficient, enhancing its transport out of the substrate and into the indoor environment. In this work, a computer tower in an office setting provides a case study to examine the emissions of, and exposure to, PBDEs. the case of a computer tower, the cooling fan increases the mass transfer coefficient, further increasing emissions. During computer use, the emission rate of PBDEs from the interior of the case is more than double the emission rate from the exterior of the case due to elevated internal temperatures and higher mass transfer due to the cooling fan. The concentration of PBDEs in the room air increases 40 - 80% for every 5°C increase inside the computer case, depending on the PBDE congener. Such enhanced emissions are a concern since recent studies have shown adverse health effects of PBDEs on human health. The major contributions of this work are: A model was developed that is useful for SVOC emissions for various heat and mass transfer situations, including diffusion through the slab and convective boundary conditions on each side of the slab, which may be simplified if the situation warrants; A systematic propagation of the uncertainties and variability of the model parameters was accomplished by using a Monte Carlo method for the input of the parameters into the model; A polydisperse indoor particle distribution was used as a sink, identifying the size-discretized particle phase PBDE concentration; An exposure assessment showed that the inhalation pathway for PBDEs in the gas and particulate phases is relevant and that the particulate phase exposure is dominant.

Download or read book Polybrominated Diphenyl Ethers in South Australian Environment written by Devarajan Shanmuganathan and published by . This book was released on 2010 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Assessment of Polybrominated Diphenyl Ethers and Other Emerging Halogenated Flame Retardants in the Aquatic Environment of China written by and published by . This book was released on 2014 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Environmental Health Perspectives written by and published by . This book was released on 2009-07 with total page 2106 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Human Exposure to Polybrominated Diphenyl Ethers PBDES in the Indoor Environment written by Deborah Jean Watkins and published by . This book was released on 2011 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Polybrominated diphenyl ethers (PBDEs) are a class of brominated flame retardants that have been widely added to consumer products such as polyurethane foam furniture and electronics. Exposure to PBDEs has been associated with adverse effects on neurodevelopment and the endocrine system. House dust and diet are thought to be main sources of PBDE exposure, but the process by which these compounds are released from products and subsequently enter people is somewhat unclear. In addition, PBDE exposure in offices and vehicles has not been well characterized. The objectives of this work were to examine pathways of PBDE exposure in multiple indoor microenvironments among a population of 31 office workers. Associations between concurrent measures of PBDEs in office dust, air, and surface wipes, home dust, vehicle dust, handwipes, and serum were examined. Dietary exposure to PBDEs was also explored using a food frequency questionnaire. In Chapter 2 we report positive correlations between PBDEs in office air, dust, and surface wipes. Associations between the three samples types were influenced by the volatility of individual congeners, as well as characteristics of the surrounding environment. PentaBDEs in handwipes were equally correlated with office air, dust, and surface wipes, suggesting that the office microenvironment is a significant source of PentaBDE exposure among office workers. In Chapter 3 we explore relationships between PBDEs in office dust, handwipes, and serum. We found that handwipes collected in the office microenvironment were correlated with both office dust and serum, providing a link between the office microenvironment and body burden. This suggests that handwipes may provide a measure of personal exposure to PBDEs in the surrounding environment, and exposure likely occurs via hands, either through incidental ingestion or dermal absorption. In Chapter 4 we examine the relative contributions of diet and dust from the home, office, and car microenvironments to PentaBDE body burden. We found that the main living area and bedroom microenvironments of the home were the most predictive of PentaBDE concentrations in serum. Although previous studies found associations between meat and dairy intake and PentaBDE body burden, diet did not predict PentaBDEs in serum in this study population.

Download or read book Polybrominated Diphenyl Ether Flame Retardants in the Antarctic Environment written by Gilvan Takeshi Yogui and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Polybrominated diphenyl ethers (PBDEs) are anthropogenic chemicals whose environmental behavior is similar to the well-known polychlorinated biphenyls (PCBs). Few studies have quantified the amount and distribution of PBDEs in the southern hemisphere and Antarctica. The analyses reported in this dissertation document the levels of PBDEs in lichens, mosses and seabird eggs collected at King George Island, Antarctic Peninsula. The analyses were carried out using Gas Chromatography/Electron Impact-Mass Spectrometry (GC/EI-MS). Employing the ion stacking technique lowered detection limits and ensured instrument selectivity and sensitivity to the compounds of interest. Lichens and mosses absorb PBDEs directly from the atmosphere and their contamination indicates that long-range transport is the primary source of these chemicals to King George Island. The congener patterns of PBDEs in plants indicate that commercial mixtures of Penta-BDE and Octa-BDE have reached Antarctica. Differences in the levels of PBDEs observed in lichens and mosses are probably due to factors that govern the uptake of PBDEs from the atmosphere. Contamination in lichens showed a positive correlation with local precipitation. Conversely, absorption of PBDEs in mosses appears to be controlled by other plant-specific factors. Marine phytoplankton-derived aerosols are hypothesized to play an important role in the atmospheric transport of PBDEs to the Antarctic environment. PBDEs in south polar skua eggs revealed much higher concentration than in penguin eggs. This is likely associated with the northward migration of these seabirds during the non-breeding season. While penguins reside year-round in Antarctica, south polar skuas migrate northward and can be seen in boreal oceans during the austral winter. Distribution of PBDEs in penguin eggs matches the pattern found in local vegetation suggesting a common source for the chemicals. In contrast, the congener pattern of south polar skuas suggests that birds breeding at King George Island are wintering in the northwestern Pacific Ocean. A potential metabolism of PBDEs in penguin eggs during the incubation period seems to be limited. Most congeners were unaltered from source material in the eggs of chinstrap and gentoo penguins. Low levels of PBDEs, short incubation periods and energy constraints may explain these observations.