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https://www.readbyqxmd.com/read/28224793/a-never-ending-story-of-per-and-polyfluoroalkyl-substances-pfass
#1
Zhanyun Wang, Jamie C DeWitt, Christopher P Higgins, Ian T Cousins
More than 3000 per- and polyfluoroalkyl substances (PFASs) are, or have been, on the global market, yet most research and regulation continues to focus on a limited selection of rather well-known long-chain PFASs, particularly perfluorooctanesulfonate (PFOS), perfluorooctanoic acid (PFOA) and their precursors. Continuing to overlook the vast majority of other PFASs is a major concern for society. We provide recommendations for how to proceed with research and cooperation to tackle the vast number of PFASs on the market and in the environment...
February 22, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28217711/source-attribution-of-poly-and-perfluoroalkyl-substances-pfass-in-surface-waters-from-rhode-island-and-the-new-york-metropolitan-area
#2
Xianming Zhang, Rainer Lohmann, Clifton Dassuncao, Xindi C Hu, Andrea K Weber, Chad D Vecitis, Elsie M Sunderland
Exposure to poly and perfluoroalkyl substances (PFASs) has been associated with adverse health effects in humans and wildlife. Understanding pollution sources is essential for environmental regulation but source attribution for PFASs has been confounded by limited information on industrial releases and rapid changes in chemical production. Here we use principal component analysis (PCA), hierarchical clustering, and geospatial analysis to understand source contributions to 14 PFASs measured across 37 sites in the Northeastern United States in 2014...
September 13, 2016: Environmental Science & Technology Letters
https://www.readbyqxmd.com/read/28211329/first-report-of-perfluoroalkyl-substances-in-south-african-odonata
#3
Velesia Lesch, Hindrik Bouwman, Ayako Kinoshita, Yasuyuki Shibata
Perfluorinated substances are global and ubiquitous pollutants. However, very little is known about these substances in invertebrates, and even less in terrestrial invertebrates in particular. We analysed adult male dragonflies from six sites in South Africa for perfluoroalkyl substances (PFASs), including perfluorooctanesulfonic acid (PFOS), perfluorooctanoic acid (PFOA), perfluorononanoic acid (PFNA), perfluorodecanoic acid (PFDA), perfluro-n-undecanoic acid (PFUnA), perfluoro-n-dodecanoic acid (PFDoA), perfluorohexanoic acid (PFHxA), and perfluorohexane sulfonic acid (PFHxS)...
February 4, 2017: Chemosphere
https://www.readbyqxmd.com/read/28202359/preliminary-assessment-on-the-bioaccessibility-of-contaminants-of-emerging-concern-in-raw-and-cooked-seafood
#4
Ricardo N Alves, Ana L Maulvault, Vera L Barbosa, Sara Cunha, Christiaan J A F Kwadijk, Diana Álvarez-Muñoz, Sara Rodríguez-Mozaz, Òscar Aznar-Alemany, Ethel Eljarrat, Damià Barceló, Margarita Fernandez-Tejedor, Alice Tediosi, António Marques
A preliminary assessment of the bioaccessibility of contaminants of emerging concern (CeCs), including perfluorinated compounds (PFCs; i.e. PFOS and PFUnA), brominated flame retardants (BFRs; i.e. BDE47, BDE100, α-HBCD) and pharmaceuticals and personal care products (PPCPs; i.e. venlafaxine, methylparaben and UV-filter OC) was performed in seafood species available in the European markets. Additionally, the effect of steaming on CeCs bioaccessibility was also investigated for the first time. Overall, steaming affected differentially contaminants' concentrations, for instance, decreasing PFOS levels in flounder, but increasing both BDE47 and BDE100...
February 13, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/28192988/accumulation-of-perfluoroalkylated-substances-in-oceanic-plankton
#5
Paulo Casal, Belén González-Gaya, Yifeng Zhang, Anthony J F Reardon, Jonathan W Martin, Begoña Jiménez, Jordi Dachs
The bioaccumulation of perfluoroalkylated substances (PFASs) in plankton has previously been evaluated only in freshwater and regional seas, but not for the large oligotrophic global oceans. Plankton samples from the tropical and subtropical Pacific, Atlantic and Indian Oceans were collected during the Malaspina 2010 circumnavigation expedition, and analyzed for 14 ionizable PFASs, including perfluorooctanoate (PFOA), perfluorooctane sulfonate (PFOS) and their respective linear and branched isomers. PFOA and PFOS concentrations in plankton ranged from 0...
February 14, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28192935/pre-polarized-hydrophobic-conducting-polymer-solid-contact-ion-selective-electrodes-with-improved-potential-reproducibility
#6
Ning He, Soma Papp, Tom Lindfors, Lajos Höfler, Rose-Marie Latonen, Róbert E Gyurcsányi
Electrically conducting polymers (ECPs) are one of the most popular types of materials to interface ion-selective membranes (ISMs) with electron-conducting substrates to construct solid-contact ion-selective electrodes (SCISEs). For optimal ion-to-electron transduction and potential stability, the p-doped ECPs with low oxidation potentials such as PPy need to be generally in their conducting form along with providing a sufficiently hydrophobic interface to counteract the aqueous layer formation. The first criterion requires that the ECPs are in their oxidized state, but the high charge density of this state is detrimental for the prevention of the aqueous layer formation...
February 9, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28187362/6-2-chlorinated-polyfluorinated-ether-sulfonate-a-pfos-alternative-induces-embryotoxicity-and-disrupts-cardiac-development-in-zebrafish-embryos
#7
Guohui Shi, Qianqian Cui, Yitao Pan, Nan Sheng, Sujie Sun, Yong Guo, Jiayin Dai
As an alternative to perfluorooctanesulfonate (PFOS), 6:2 chlorinated polyfluorinated ether sulfonate (commercial name: F-53B) has been used as a mist suppressant in Chinese electroplating industries for over 30 years. It has been found in the environment and fish, and one acute assay indicated F-53B was moderately toxic. However, the toxicological information on this compound was incomplete and insufficient for assessment of their environment impact. The object of this study was to examine the developmental toxicity of F-53B using zebrafish embryos...
February 3, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28185155/perfluoroalkyl-acids-pfaas-in-water-and-sediment-from-the-coastal-regions-of-shandong-peninsula-china
#8
Yi Wan, Shiliang Wang, Xuezhi Cao, Yuanxin Cao, Lu Zhang, Hui Wang, Jinfeng Liu
Perfluoroalkyl acids (PFAAs) have been observed in various environmental matrices globally in recent years. In this study, the levels, spatial distribution tendencies, and partitioning characteristics of the target 12 PFAAs were investigated in water and sediment from the coastal regions of Shandong peninsula in China, and two sediment core samples were also collected to study the vertical and historical variation of PFAAs. The ranges (means) of total PFAA concentrations were 23.69-148.48 ng/L (76.11 ng/L) in the water and 1...
March 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28171771/association-of-perfluoroalkyl-substances-exposure-with-impaired-lung-function-in-children
#9
Xiao-Di Qin, Zhengmin Min Qian, Shyamali C Dharmage, Jennifer Perret, Sarah Dee Geiger, Steven E Rigdon, Steven Howard, Xiao-Wen Zeng, Li-Wen Hu, Bo-Yi Yang, Yang Zhou, Meng Li, Shu-Li Xu, Wen-Wen Bao, Ya-Zhi Zhang, Ping Yuan, Jia Wang, Chuan Zhang, Yan-Peng Tian, Min Nian, Xiang Xiao, Wen Chen, Yungling Leo Lee, Guang-Hui Dong
Previous studies have demonstrated associations between serum levels of perfluoroalkyl substances (PFASs) and asthma or asthma related-biomarkers. However, no studies have reported a possible relationship between PFASs exposure and lung function among children. The objective of the present study is to test the association between PFASs exposure and lung function in children from a high exposure area by using a cross-sectional case-control study, which included 132 asthmatic children and 168 non-asthmatic controls recruited from 2009 to 2010 in the Genetic and Biomarkers study for Childhood Asthma...
February 4, 2017: Environmental Research
https://www.readbyqxmd.com/read/28160993/three-cycles-of-human-biomonitoring-in-flanders-time-trends-observed-in-the-flemish-environment-and-health-study
#10
Greet Schoeters, Eva Govarts, Liesbeth Bruckers, Elly Den Hond, Vera Nelen, Stefaan De Henauw, Isabelle Sioen, Tim S Nawrot, Michelle Plusquin, Annette Vriens, Adrian Covaci, Ilse Loots, Bert Morrens, Dries Coertjens, Nicolas Van Larebeke, Sam De Craemer, Kim Croes, Nathalie Lambrechts, Ann Colles, Willy Baeyens
To follow time trends in exposure to environmental chemicals, three successive campaigns of the Flemish Environment and Health Study (FLEHS) have recruited and sampled in total 5825 participants between 2002 and 2014. Cord samples from newborns, urine and blood samples from 14 to 15 years old adolescents and from adults between 50 and 65 years old were analysed in geographical representative samples of the Flemish population. The data of the different campaigns were considered per age group and per biomarker after adjustment for predefined covariates to take into account differences in characteristics of the study populations over time...
November 18, 2016: International Journal of Hygiene and Environmental Health
https://www.readbyqxmd.com/read/28160676/spatiotemporal-distribution-and-potential-sources-of-perfluoroalkyl-acids-in-huangpu-river-shanghai-china
#11
Zhuyu Sun, Chaojie Zhang, Hong Yan, Changlai Han, Ling Chen, Xiangzhou Meng, Qi Zhou
Perfluoroalkyl acids (PFAAs) have been found to be ubiquitously disseminated in the environment due to their widespread use in recent decades. In this study, the occurrence and spatiotemporal distribution of PFAAs in the surface water of Huangpu River, Shanghai, China were investigated from 2012 to 2014. The total concentration of 14 PFAAs (ΣPFAAs) ranged from 39.8 to 596.2 ng L(-1), with a mean value of 226.3 ng L(-1). Perfluorooctanoic acid (PFOA) and perfluorooctane sulfonic acid (PFOS) were dominant, with their mean concentrations of 139...
January 27, 2017: Chemosphere
https://www.readbyqxmd.com/read/28157603/efficient-treatment-of-perfluorohexanoic-acid-by-nanofiltration-followed-by-electrochemical-degradation-of-the-nf-concentrate
#12
Álvaro Soriano, Daniel Gorri, Ane Urtiaga
The present study was aimed at the development of a strategy for removing and degrading perfluorohexanoic acid (PFHxA) from industrial process waters at concentrations in the range 60-200 mg L(-1). The treatment train consisted of nanofiltration (NF) separation followed by electrochemical degradation of the NF concentrate. Using a laboratory-scale system and working in the total recirculation mode, the DowFilm NF270 membrane provided PFHxA rejections that varied in the range 96.6-99.4% as the operating pressure was increased from 2...
January 25, 2017: Water Research
https://www.readbyqxmd.com/read/28146072/a-mixture-of-persistent-organic-pollutants-and-perfluorooctanesulfonic-acid-induces-similar-behavioural-responses-but-different-gene-expression-profiles-in-zebrafish-larvae
#13
Abdolrahman Khezri, Thomas W K Fraser, Rasoul Nourizadeh-Lillabadi, Jorke H Kamstra, Vidar Berg, Karin E Zimmer, Erik Ropstad
Persistent organic pollutants (POPs) are widespread in the environment and some may be neurotoxic. As we are exposed to complex mixtures of POPs, we aimed to investigate how a POP mixture based on Scandinavian human blood data affects behaviour and neurodevelopment during early life in zebrafish. Embryos/larvae were exposed to a series of sub-lethal doses and behaviour was examined at 96 h post fertilization (hpf). In order to determine the sensitivity window to the POP mixture, exposure models of 6 to 48 and 48 to 96 hpf were used...
January 29, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28135695/home-produced-eggs-an-important-pathway-of-human-exposure-to-perfluorobutanoic-acid-pfba-and-perfluorooctanoic-acid-pfoa-around-a-fluorochemical-industrial-park-in-china
#14
Hongqiao Su, Yajuan Shi, Yonglong Lu, Pei Wang, Meng Zhang, Andrew Sweetman, Kevin Jones, Andrew Johnson
Dietary intake is considered to be a major pathway of human exposure to perfluoroalkyl acids (PFAAs). Chicken egg is an important contributor to the Chinese diet. In the present study, PFAAs in home produced eggs (HPEs) and commercially produced eggs (CPEs) surrounding a fluorochemical industrial park (FIP) in China were investigated. PFAAs in HPEs decreased with increasing distance from the FIP. HPEs were much more contaminated than CPEs, with PFAAs in CPEs comparable to or lower than those in HPEs from 20km away from the FIP...
January 27, 2017: Environment International
https://www.readbyqxmd.com/read/28135663/high-levels-of-pfos-in-eggs-of-three-bird-species-in-the-neighbourhood-of-a-fluoro-chemical-plant
#15
Ana Lopez-Antia, Tom Dauwe, Johan Meyer, Koen Maes, Lieven Bervoets, Marcel Eens
We studied perfluorooctane sulfonate (PFOS) levels in the eggs of three primarily invertivorous bird species sampled in 2006 near a fluoro-chemical plant: the great tit (Parus major), the northern lapwing (Vanellus vanellus) and the Mediterranean gull (Larus melanocephalus). Our study reported some of the highest PFOS levels ever measured in wildlife to date (i.e. up to 46182ng/g ww in lapwing eggs). A pronounced decrease in PFOS concentration in the Northern lapwing eggs with distance from the fluoro-chemical plant was found...
January 27, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28131474/transcriptome-sequencing-reveals-prenatal-pfos-exposure-on-liver-disorders
#16
Keng Po Lai, Jing Woei Li, Angela Cheung, Rong Li, Md Baki Billah, Ting Fung Chan, Chris Kong Chu Wong
Perfluorooctane sulfonate (PFOS), a hepatic toxicant and a potential hepatocarcinogen, is commonly used in industrial products. The widespread contamination of PFOS in human maternal and cord blood has raised concerns about its potential risks to the fetus. It is believed that adverse environmental exposure during the critical period of embryo development can have long-lasting consequences in later life. In this report, we used transcriptome sequencing, followed by bioinformatics analysis, to elucidate the potential hepatotoxic and hepatocarcinogenic effects of prenatal PFOS exposure in the fetus...
January 25, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28128969/prenatal-exposure-to-perfluoroalkyl-substances-and-body-fatness-in-girls
#17
Terryl J Hartman, Antonia M Calafat, Adrianne K Holmes, Michele Marcus, Kate Northstone, W Dana Flanders, Kayoko Kato, Ethel V Taylor
BACKGROUND: Perfluoroalkyl substances (PFASs) are used in surface coatings that resist stains, grease, and water. METHODS: The association between in utero PFAS exposure and girls' body fatness at age 9 was analyzed in The Avon Longitudinal Study of Parents and Children (UK). Maternal serum [median 15 weeks: interquartile range (IQR) 10 and 28 weeks of gestation] was analyzed for perfluorooctane sulfonate (PFOS), perfluorooctanoate (PFOA), perfluorohexane sulfonate (PFHxS), and perfluorononanoate (PFNA)...
January 27, 2017: Childhood Obesity
https://www.readbyqxmd.com/read/28115654/evaluation-of-serum-lipid-thyroid-and-hepatic-clinical-chemistries-in-association-with-serum-perfluorooctanesulfonate-pfos-in-cynomolgus-monkeys-after-oral-dosing-with-potassium-pfos
#18
Shu-Ching Chang, Bruce C Allen, Kara L Andres, David J Ehresman, Ria Falvo, Anne Provencher, Geary W Olsen, John L Butenhoff
An oral dose study with PFOS was undertaken to identify potential associations between serum PFOS and changes in serum clinical chemistry parameters in purpose-bred young adult cynomolgus monkeys (Macaca fasicularis). While control group (n=6/sex) was sham-dosed with vehicle (0.5% Tween® 20 and 5% ethanol in DI water) during the study, low-dose group (n=6/sex) received one single K(+)PFOS dose (9 mg/kg) and high-dose group (n=6/sex) received three separate K(+)PFOS doses (11 - 17.2 mg/kg). Monkeys were given routine checkups and observed carefully for health problems on a daily basis...
January 23, 2017: Toxicological Sciences: An Official Journal of the Society of Toxicology
https://www.readbyqxmd.com/read/28115121/photochemical-decomposition-of-1h-1h-2h-2h-perfluorooctane-sulfonate-6-2fts-induced-by-ferric-ions
#19
Ling Jin, Chuanjia Jiang, Pengyi Zhang
Perfluorooctane sulfonate (PFOS) had wide applications, such as in the electroplating industry, but its use was restricted in 2009 by the Stockholm Convention, due to its environmental persistence and potential hazards. As the most common PFOS alternative, 1H,1H,2H,2H-perfluorooctane sulfonic acid (6:2FTS) and its salts have been increasingly used. However, little is known about its photochemical decomposition. This paper reports the ferric ion-induced efficient decomposition and defluorination of 6:2FTS under 254nm ultraviolet (UV) irradiation; the underlying mechanisms were also investigated...
January 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28111093/effects-of-perfluorinated-chemicals-on-thyroid-function-markers-of-ovarian-reserve-and-natural-fertility
#20
Natalie M Crawford, Suzanne E Fenton, Mark Strynar, Erin P Hines, David A Pritchard, Anne Z Steiner
Perfluorinated chemicals (PFCs) can act as endocrine-disrupting chemicals, but there has been limited study of their effects on ovarian reserve or fecundability. 99 women, 30-44 years old, without infertility were followed until pregnancy. Initially, serum was evaluated for Antimullerian hormone (AMH), thyroid hormones: thyroid stimulating hormone (TSH), thyroxine (T4), free thyroxine (fT4), and triiodothyronine (T3), and PFCs: perfluorooctanoate (PFOA), perfluorooctane sulfonate (PFOS), perfluorononanoic acid (PFNA), and perfluorohexanesulfonic acid (PFHxS)...
January 19, 2017: Reproductive Toxicology
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