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https://www.readbyqxmd.com/read/27932217/highly-efficient-and-stable-zr-doped-nanocrystalline-pbo2-electrode-for-mineralization-of-perfluorooctanoic-acid-in-a-sequential-treatment-system
#1
Zesheng Xu, Yanxin Yu, Han Liu, Junfeng Niu
Zr-doped nanocrystalline PbO2 (Zr-PbO2) film electrodes were prepared at different bath temperatures. The Zr-PbO2 electrode doped at 75°C (75-Zr-PbO2) featured high oxygen evolution overpotential, large effective area and good electrocatalytic performance. The oxygen evolution potential and the effective area of 75-Zr-PbO2 achieved 1.91V (vs. SCE) and 9.1cm(2), respectively. The removal efficiency and the defluorination ratio of PFOA reached 97.0% and 88.1% after 90min electrolysis. The primary mineralization products (i...
December 5, 2016: Science of the Total Environment
https://www.readbyqxmd.com/read/27927675/is-body-mass-index-associated-with-patellofemoral-pain-and-patellofemoral-osteoarthritis-a-systematic-review-and-meta-regression-and-analysis
#2
Harvi F Hart, Christian J Barton, Karim M Khan, Henrik Riel, Kay M Crossley
BACKGROUND: Patellofemoral pain (PFP) occurs frequently, and may be related to patellofemoral osteoarthritis (PFOA). Obesity is associated with increased risk of knee OA. This systematic review involves a meta-regression and analysis to determine the relationship between body mass index (BMI) and PFP and PFOA, and to determine the link between BMI and interventional outcomes. METHODS: We searched seven electronic databases and reference lists of relevant papers and systematic reviews, for cross-sectional, prospective, human-based observational and interventional studies reporting BMI in individuals with PFP or PFOA compared to healthy controls...
December 7, 2016: British Journal of Sports Medicine
https://www.readbyqxmd.com/read/27927583/quantitative-bias-analysis-for-epidemiological-associations-of-perfluoroalkyl-substance-serum-concentrations-and-early-onset-of-menopause
#3
Christopher D Ruark, Gina Song, Miyoung Yoon, Marc-André Verner, Melvin E Andersen, Harvey J Clewell, Matthew P Longnecker
An association between increased serum concentrations of perfluoroalkyl substances (PFAS) such as perfluorooctane sulfonate (PFOS) and perfluorooctanoate (PFOA) and early menopause has been reported (Knox et al., 2011; Taylor et al., 2014). This association may be explained by the fact that women who underwent menopause no longer excrete PFAS through menstruation. Our objective was to assess how much of the epidemiologic association between PFAS and altered timing of menopause might be explained by reverse causality...
December 5, 2016: Environment International
https://www.readbyqxmd.com/read/27924715/perfluoroalkyl-acids-pfaas-and-anthropometric-measures-in-the-first-year-of-life-results-from-the-duisburg-birth-cohort
#4
Eman Alkhalawi, Monika Kasper-Sonnenberg, Michael Wilhelm, Wolfgang Völkel, Jürgen Wittsiepe
In the context of the Duisburg Birth Cohort, this retrospective cohort study provides results of internal exposure to perfluorooctanoic acid (PFOA), perfluorooctanesulfonic acid (PFOS), and perfluorohexanesulfonic acid (PFHxS) in 156 mother-child pairs, and investigates whether and to what extent in utero exposure of these chemicals at German background levels exerts an effect on newborn and infant weight and length, and weight in relation to length expressed by ponderal index, in order to examine whether any reduction in weight is disproportionate to length...
2016: Journal of Toxicology and Environmental Health. Part A
https://www.readbyqxmd.com/read/27917506/comparative-in-vitro-toxicity-assessment-of-perfluorinated-carboxylic-acids
#5
Cecon T Mahapatra, Nur P Damayanti, Samuel C Guffey, Jennifer S Serafin, Joseph Irudayaraj, Maria S Sepúlveda
Perfluoroalkyl and polyfluoroalkyl substances (PFASs) are synthetic fluorinated compounds that are highly bioaccumulative and persistent organic pollutants. Perfluorooctanoic acid (PFOA), an eight-carbon chain perfluorinated carboxylic acid, was used heavily for the production of fluoropolymers, but concerns have led to its replacement by shorter carbon chain homologues such as perfluorohexanoic acid (PFHxA) and perfluorobutanoic acid (PFBA). However, limited toxicity data exist for these substitutes. We evaluated the toxicity of PFOA, PFHxA and PFBA on a zebrafish liver cell line and investigated the effects of exposure on cell metabolism...
December 5, 2016: Journal of Applied Toxicology: JAT
https://www.readbyqxmd.com/read/27914867/new-hbm-values-for-emerging-substances-inventory-of-reference-and-hbm-values-in-force-and-working-principles-of-the-german-human-biomonitoring-commission
#6
REVIEW
Petra Apel, Jürgen Angerer, Michael Wilhelm, Marike Kolossa-Gehring
The German Human Biomonitoring Commission (HBM Commission) derives health-related guidance values (Human Biomonitoring assessment values, HBM values) according to the procedures described in the HBM Commission's position papers. Since the last adaption of the methodology in 2014, the HBM Commission has established a series of new HBM values, mainly on the basis of internationally agreed TDI/RfD values, or of toxicologically well- founded points of departure observed in animal studies. The derivation of these new HBM values for HBCDD, triclosan, 2-MBT, PFOA and PFOS as well as for the metabolites of glycol ethers, of Hexamoll(®) DINCH(®), DPHP, DEHTP, NMP, NEP, and 4-MBC is specified, and the HBM values are presented together with already established HBM values for other substances...
September 17, 2016: International Journal of Hygiene and Environmental Health
https://www.readbyqxmd.com/read/27905562/occurrence-temporal-trends-and-half-lives-of-perfluoroalkyl-acids-pfaas-in-occupational-workers-in-china
#7
Jianjie Fu, Yan Gao, Lin Cui, Thanh Wang, Yong Liang, Guangbo Qu, Bo Yuan, Yawei Wang, Aiqian Zhang, Guibin Jiang
Paired serum and urine samples were collected from workers in a fluorochemical plant from 2008 to 2012 (n = 302) to investigate the level, temporal trends, and half-lives of PFAAs in workers of a fluorochemical plant. High levels of perfluorohexane sulfonate (PFHxS), perfluorooctanoic acid (PFOA), and perfluorooctanesulfonate (PFOS) were detected in serum with median concentrations of 764, 427, and 1725 ng mL(-1), respectively. The half-lives of PFAAs in workers were estimated by daily clearance rates and annual decline rates of PFAAs in serum by a first-order model...
December 1, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27901621/perfluorooctanoic-acid-induces-mitochondrial-dysfunction-in-mc3t3-e1-osteoblast-cells
#8
Eun Mi Choi, Kwang Sik Suh, Sang Youl Rhee, Seungjoon Oh, Jeong-Taek Woo, Sung Woon Kim, Young Seol Kim, Youngmi Kim Pak, Suk Chon
Perfluorooctanoic acid (PFOA), a stable organic perfluorinated compound, is an emerging persistent organic pollutant, found widely in human and wildlife populations. Recent evidence suggests that exposure to environmental toxicants can be associated with higher risks of osteoporosis and fractures. We studied the cellular toxicology of PFOA in MC3T3-E1osteoblast cells. To examine the effect of PFOA, we measured cell viability, reactive oxygen species (ROS), mitochondrial superoxide, and mitochondrial parameters including adenosine triphosphate (ATP) level, mitochondrial membrane potential (MMP), cardiolipin content, and cytochrome c release in MC3T3-E1 cells...
November 30, 2016: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/27888120/gestational-exposure-to-perfluorooctanoic-acid-pfoa-alterations-in-motor-related-behaviors
#9
David R Goulding, Sally S White, Sandra J McBride, Suzanne E Fenton, G Jean Harry
Perfluoroalkyl and polyfluoroalkyl substances are used in commercial applications and developmental exposure has been implicated in alterations in neurobehavioral functioning. While associations between developmental perfluorooctanoic acid (PFOA) exposure and human outcomes have been inconsistent, studies in experimental animals suggest alterations in motor related behaviors. To examine a dose-response pattern of neurobehavioral effects following gestational exposure to PFOA, pregnant CD-1 mice received PFOA (0, 0...
November 22, 2016: Neurotoxicology
https://www.readbyqxmd.com/read/27887832/perfluoroalkyl-acids-pfaas-in-the-pra-and-kakum-river-basins-and-associated-tap-water-in-ghana
#10
David K Essumang, Albert Eshun, Jonathan N Hogarh, John K Bentum, Joseph K Adjei, Junya Negishi, Shihori Nakamichi, Md Habibullah-Al-Mamun, Shigeki Masunaga
Perfluoroalkyl acids (PFAAs) are persistent environmental pollutants that have been detected in various media including human serum. Due to concerns regarding their bioaccumulation and possible negative health effects, an understanding of routes of human exposure is necessary. PFAAs are recalcitrant in many water treatment processes, making drinking water a potential source of human exposure. This study presents the first report on contamination from PFAAs in river and drinking water in Ghana. The targeted PFAAs were perfluoroalkyl carboxylic acids (PFCAs) with C4-14 carbon chain and perfluoroalkane sulphonic acids (PFSAs) with C6, 8, 10...
November 22, 2016: Science of the Total Environment
https://www.readbyqxmd.com/read/27886542/occurrence-of-perfluoroalkyl-substances-in-cord-serum-and-association-with-growth-indicators-in-newborns-from-beijing
#11
Yu Shi, Lin Yang, Jingguang Li, Jianqiang Lai, Yuxin Wang, Yunfeng Zhao, Yongning Wu
Perfluoroalkyl substances (PFASs), a group of environmental pollutants, persistently exist in the environment. To investigate the associations between PFASs levels in cord serum and birth weight, birth length and ponderal index, we measured PFASs in cord serum samples from 170 infants from Feb. 2012 to Jun. 2012 in Beijing, China. The mean concentrations in cord serum samples for perfluorooctanoic acid (PFOA), perfluorooctane sulfonic acid (PFOS), perfluorohexane sulfonic acid (PFHxS), perfluorononanoic acid (PFNA), perfluorodecanoic acid (PFDA) and perfluoroundecanoic acid (PFUnA) were 1...
November 22, 2016: Chemosphere
https://www.readbyqxmd.com/read/27884404/exposure-to-perfluoroalkyl-substances-and-thyroid-function-in-pregnant-women-and-children-a-systematic-review-of-epidemiologic-studies
#12
REVIEW
Virginia Ballesteros, Olga Costa, Carmen Iñiguez, Tony Fletcher, Ferran Ballester, Maria-Jose Lopez-Espinosa
INTRODUCTION: Thyroid hormones (THs) are especially important for brain maturation and development during the fetal period and childhood. Several epidemiological studies have assessed the possible association between exposure to perfluoroalkyl substances (PFAS) and thyroid outcomes during the early stages of life. We aimed to review this evidence. METHODS: We conducted a systematic review in compliance with the PRISMA Statement (search conducted in PubMed and Embase, as well as in the citations of the selected articles)...
November 21, 2016: Environment International
https://www.readbyqxmd.com/read/27875720/multi-generational-xenoestrogenic-effects-of-perfluoroalkyl-acids-pfaas-mixture-on-oryzias-latipes-using-a-flow-through-exposure-system
#13
Jin Wuk Lee, Jae-Woo Lee, Yu-Jin Shin, Ji-Eun Kim, Tae-Kwon Ryu, Jisung Ryu, Jaean Lee, Pilje Kim, Kyunghee Choi, Kyunghwa Park
To elucidate the multi-generational estrogenic potential of Perfluoroalkyl acids (PFAAs) mixture, vitellogenin (VTG) expression, growth indices, histological alteration, fecundity, hatching rate, larval survival rate, and sex ratio of Japanese medaka (Oryzias latipes) were investigated by exposing the fish to a mixture of perfluorooctane sulfonate (PFOS), perfluroroctanoic acid (PFOA), perfluorobutane sulfonate (PFBS), and perfluorononanoic acid (PFNA) for three generations (238 days). Mixture composition is in the ratio of 1:1:1:1...
November 19, 2016: Chemosphere
https://www.readbyqxmd.com/read/27871799/molecular-mechanisms-of-pfoa-induced-toxicity-in-animals-and-humans-implications-for-health-risks
#14
REVIEW
Kan Li, Peng Gao, Ping Xiang, Xuxiang Zhang, Xinyi Cui, Lena Q Ma
As an emerging persistent organic pollutant (POP), perfluorooctanoate (PFOA) is one of the most abundant perfluorinated compounds (PFCs) in the environment. This review summarized the molecular mechanisms and signaling pathways of PFOA-induced toxicity in animals and humans as well as their implications for health risks in humans. Traditional PFOA-induced signal pathways such as peroxisome proliferating receptor alpha (PPARα), constitutive androstane receptor (CAR), farnesoid X receptor (FXR), and pregnane-X receptor (PXR) may not be important for PFOA-induced health effects on humans...
November 18, 2016: Environment International
https://www.readbyqxmd.com/read/27837466/thyroid-disruption-by-perfluorooctane-sulfonate-pfos-and-perfluorooctanoate-pfoa
#15
REVIEW
F Coperchini, O Awwad, M Rotondi, F Santini, M Imbriani, L Chiovato
BACKGROUND: Perfluorooctane sulfonate (PFOS) and perfluorooctanoate (PFOA) are two fluorinated compounds widely used in industry because of their useful chemical characteristics. They were identified as endocrine disruptors due to their ability to interfere with thyroid function. The resistance of PFOA and PFOS to environmental degradation, their bio-accumulation in food chains, and their long half-life raised concern in the scientific community, and several studies were performed with the aim to establish the real dangerousness of these compounds for the human health...
November 11, 2016: Journal of Endocrinological Investigation
https://www.readbyqxmd.com/read/27834049/spatio-temporal-dynamics-of-per-and-polyfluoroalkyl-substances-pfass-and-transfer-to-periphytic-biofilm-in-an-urban-river-case-study-on-the-river-seine
#16
Gabriel Munoz, Lise C Fechner, Emmanuel Geneste, Patrick Pardon, Hélène Budzinski, Pierre Labadie
This study addresses the spatio-temporal dynamics of per and polyfluoroalkyl substances (PFASs) in a highly urbanized freshwater hydrosystem, the Seine River (NW France). The distribution of PFASs between water, sediment, and periphytic biofilm was investigated at three sampling sites along a longitudinal gradient upstream and downstream from the Paris urban area. Seasonal variability was assessed through four sampling campaigns performed under contrasting hydrological conditions. In the dissolved phase, ∑PFASs fluctuated between 2 and 9 ng L(-1) upstream and 6-105 ng L(-1) downstream from Paris...
November 10, 2016: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/27832320/activation-of-nuclear-receptor-car-by-an-environmental-pollutant-perfluorooctanoic-acid
#17
Taiki Abe, Mirei Takahashi, Makoto Kano, Yuto Amaike, Chizuru Ishii, Kazuhiro Maeda, Yuki Kudoh, Toru Morishita, Takuomi Hosaka, Takamitsu Sasaki, Susumu Kodama, Atsushi Matsuzawa, Hiroyuki Kojima, Kouichi Yoshinari
Perfluorocarboxylic acids (PFCAs) including perfluorooctanoic acid (PFOA) are environmental pollutants showing high accumulation, thermochemical stability and hepatocarcinogenicity. Peroxisome proliferator-activated receptor α is suggested to mediate their toxicities, but the precise mechanism remains unclear. Previous reports also imply a possible role of constitutive androstane receptor (CAR), a key transcription factor for the xenobiotic-induced expression of various genes involved in drug metabolism and disposition as well as hepatocarcinogenesis...
November 10, 2016: Archives of Toxicology
https://www.readbyqxmd.com/read/27830527/effects-of-different-waveforms-on-the-performance-of-active-capillary-dielectric-barrier-discharge-ionization-mass-spectrometry
#18
Morphy C Dumlao, Dan Xiao, Daming Zhang, John Fletcher, William A Donald
Active capillary dielectric barrier discharge ionization (DBDI) is emerging as a compact, low-cost, and robust method to form intact ions of small molecules for detection in near real time by portable mass spectrometers. Here, we demonstrate that by using a 10 kHz, ~2.5 kVp-p high-voltage square-wave alternating current plasma, active capillary DBDI can consume less than 1 μW of power. In contrast, the power consumed using a sine and triangle alternating current waveform is more than two orders of magnitude higher than that for the square waveform to obtain a similar voltage for plasma generation...
November 9, 2016: Journal of the American Society for Mass Spectrometry
https://www.readbyqxmd.com/read/27824939/factors-associated-with-maternal-serum-levels-of-perfluoroalkyl-substances-and-organochlorines-a-descriptive-study-of-parous-women-in-norway-and-sweden
#19
Hilde B Lauritzen, Tricia L Larose, Torbjørn Øien, Jon Ø Odland, Margot van de Bor, Geir W Jacobsen, Torkjel M Sandanger
INTRODUCTION: Perfluoroalkyl substances (PFASs) and organochlorines (OCs) are ubiquitous and persistent in the environment and proposed endocrine disrupting chemicals (EDCs). They can be transferred across the placenta during pregnancy, and studies suggest that the prenatal period may be particularly sensitive for influences on fetal growth and development. Several studies have investigated socio-demographic and pregnancy related factors associated with maternal serum PFAS and OC levels, but few studies have been conducted in time periods with increasing emissions of PFASs and recent emissions of OCs...
2016: PloS One
https://www.readbyqxmd.com/read/27810540/perfluorinated-alkyl-substances-pfass-in-northern-spain-municipal-solid-waste-landfill-leachates
#20
I Fuertes, S Gómez-Lavín, M P Elizalde, A Urtiaga
Landfill leachates have been recognized as significant secondary sources of poly- and perfluoroalkyl substances (PFASs). This study presents data on the occurrence and concentration of 11 perfluoroalkyl carboxylates (PFCAs) and 5 perfluoroalkyl sulfonates (PFSAs) in leachates from 4 municipal solid waste landfill sites located across northern Spain. To the best of our knowledge, this is the first report of the presence of PFASs in Spanish landfill leachates. Two of the landfill sites applied on-site treatment using membrane bioreactors (MBR), and its effect on PFASs occurrence is also reported...
October 28, 2016: Chemosphere
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