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https://www.readbyqxmd.com/read/28803190/legacy-and-new-halogenated-persistent-organic-pollutants-in-polar-bears-from-a-contamination-hotspot-in-the-arctic-hudson-bay-canada
#1
R J Letcher, A D Morris, M Dyck, E Sverko, E J Reiner, D A D Blair, S G Chu, L Shen
A large and complex suite of 295 legacy and new halogenated persistent organic pollutants (POPs) were investigated in fat or liver tissue samples of polar bears collected in 2013-2014 from Southern (SHB) and Western (WHB) subpopulations of the Canadian Arctic contaminants hotspot of Hudson Bay. A total of 210 POPs were detected and/or quantifiable with some frequency in all fat or liver samples. POP profile and concentration differences were investigated both within (e.g. age and sex) and between the two subpopulations...
August 10, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28802206/perfluoroalkyl-substance-exposure-and-urine-cc16-levels-among-asthmatics-a-case-control-study-of-children
#2
Yang Zhou, Wen-Wen Bao, Zhengmin Min Qian, Sarah Dee Geiger, Katelyn L Parrish, Bo-Yi Yang, Yungling Leo Lee, Guang-Hui Dong
BACKGROUND: Studies have reported an association between serum perfluoroalkyl substances (PFASs) and asthma. However, few studies have examined the possible associations between PFASs and the 16-kDa club cell secretory protein (Clara) (CC16) level, a prominent biomarker of asthma, among adolescents. METHODS: We recruited a total of 231 asthmatic children and 225 non-asthmatic controls in the Genetic and Biomarkers study for Childhood Asthma (GBCA) in northern Taiwan from 2009 to 2010...
August 9, 2017: Environmental Research
https://www.readbyqxmd.com/read/28800519/emerging-poly-and-perfluoroalkyl-substances-in-the-aquatic-environment-a-review-of-current-literature
#3
REVIEW
Feng Xiao
Poly- and perfluoroalkyl substances (PFASs) comprise a group of synthetic organic surfactants with a wide range of industrial and commercial applications. A few PFASs such as perfluorooctane sulfonate (PFOS) and perfluorooctanoate (PFOA) are now known to be ubiquitously present in the aquatic environment. They have become a global concern because of the toxicity and bioaccumulative properties. With the increasing availability of high-resolution mass spectrometers, many novel PFASs have been identified. Studies published between 2009 and 2017 have discovered 455 new PFASs (including nine fully and 446 partially fluorinated compounds), 45%, 29%, 17%, and 8% of which are anions, zwitterions, cations, and neutrals, respectively...
July 15, 2017: Water Research
https://www.readbyqxmd.com/read/28800414/global-distribution-of-perfluorochemicals-pfcs-in-potential-human-exposure-source-a-review
#4
REVIEW
Jun-Meng Jian, Ying Guo, Lixi Zeng, Liu Liang-Ying, Xingwen Lu, Fei Wang, Eddy Y Zeng
Human exposure to perfluorochemicals (PFCs) has attracted mounting attention due to their potential harmful effects. Breathing, dietary intake, and drinking are believed to be the main routes for PFC entering into human body. Thus, we profiled PFC compositions and concentrations in indoor air and dust, food, and drinking water with detailed analysis of literature data published after 2010. Concentrations of PFCs in air and dust samples collected from home, office, and vehicle were outlined. The results showed that neutral PFCs (e...
August 8, 2017: Environment International
https://www.readbyqxmd.com/read/28783897/gonadal-intersex-in-smallmouth-bass-micropterus-dolomieu-from-northern-indiana-with-correlations-to-molecular-biomarkers-and-anthropogenic-chemicals
#5
Ahmed Abdel-Moneim, Daragh Deegan, Jiejun Gao, Chloe De Perre, Jarrod S Doucette, Byron Jenkinson, Linda Lee, Maria S Sepúlveda
Over the past decade, studies have shown that exposure to endocrine disrupting chemicals (EDCs) can cause gonadal intersex in fish. Smallmouth bass (Micropterus dolomieu) males appear to be highly susceptible to developing testicular oocytes (TO), the most prevalent form of gonadal intersex, as observed in various areas across the U.S. In this study, prevalence and severity of TO was quantified for smallmouth bass sampled from the St. Joseph River in northern Indiana, intersex biomarkers were developed, and association between TO prevalence and organic contaminants were explored...
July 31, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28780137/the-effect-of-drinking-water-contaminated-with-perfluoroalkyl-substances-on-a-10-year-longitudinal-trend-of-plasma-levels-in-an-elderly-uppsala-cohort
#6
Jordan Stubleski, Samira Salihovic, P Monica Lind, Lars Lind, Linda Dunder, Philip McCleaf, Karin Eurén, Lutz Ahrens, Magnus Svartengren, Bert van Bavel, Anna Kärrman
BACKGROUND: In 2012, drinking water contaminated with per- and polyfluoroalkyl substances (PFASs), foremost perfluorooctanesulfonic acid (PFOS) and perfluorohexanesulfonic acid (PFHxS) at levels over 20ng/L and 40ng/L, respectively, was confirmed in Uppsala, Sweden. OBJECTIVES: We assessed how a longitudinally sampled cohort's temporal trend in PFAS plasma concentration was influenced by their residential location and determined the plausible association or disparity between the PFASs detected in the drinking water and the trend in the study cohort...
August 3, 2017: Environmental Research
https://www.readbyqxmd.com/read/28754927/perfluoroalkyl-substances-in-human-bone-concentrations-in-bones-and-effects-on-bone-cell-differentiation
#7
A Koskela, J Koponen, P Lehenkari, M Viluksela, M Korkalainen, J Tuukkanen
Perfluoroalkyl substances (PFAS), including two most commonly studied compounds perfluorooctane sulfonate (PFOS) and perfluorooctanoic acid (PFOA), are widely distributed environmental pollutants, used extensively earlier. Due to their toxicological effects the use of PFAS is now regulated. Based on earlier studies on PFOA's distribution in bone and bone marrow in mice, we investigated PFAS levels and their possible link to bone microarchitecture of human femoral bone samples (n = 18). Soft tissue and bone biopsies were also taken from a 49-year old female cadaver for PFAS analyses...
July 28, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28752755/oil-repellent-antifogging-films-with-water-enabled-functional-and-structural-healing-ability
#8
Fuchang Xu, Xiang Li, Yang Li, Junqi Sun
Healable oil-repellent antifogging films are fabricated by layer-by-layer assembly of hyaluronic acid (HA) and branched poly(ethylenimine) (bPEI), followed by immersion in aqueous solutions of perfluorooctanesulfonic acid potassium salt (PFOS). The loading of PFOS endows the HA/bPEI films with oil repellency, while maintaining its original hydrophilicity. The resulting films have an excellent antifogging ability, and various organic liquids can easily slide down the slightly tilted films (<10°) without any residue...
July 28, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28750732/ni-functionalized-submicron-mesoporous-silica-particles-as-a-sorbent-for-metal-affinity-chromatography
#9
Dmitry A Kurdyukov, Ekaterina N Chernova, Yana V Russkikh, Daniil A Eurov, Vasily V Sokolov, Anna A Bykova, Vladimir V Shilovskikh, Olga A Keltsieva, Eugenii V Ubyivovk, Yuri A Anufrikov, Anna V Fedorova, Artem A Selyutin, Nicolay G Sukhodolov, Ekaterina P Podolskaya, Valery G Golubev
In this research, a novel IMAC sorbent with high specificity for chlorine-containing compounds was developed. Ni-functionalized monodisperse spherical mesoporous silica particles of 500±25nm diameter were synthesized and their metal affinity properties were studied with the use of diclofenac as the model substance. The particles were aggregatively stable in the pH range of 3-12. The sorbent demonstrated a high adsorption capacity (0.60±0.06μg of DCF per 1mg of the sorbent) and high adsorption/desorption rate (20 and 5min was enough for the sorbent saturation and desorption of DCF, correspondingly)...
July 15, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28747671/erratum-perfluorooctanesulfonate-pfos-induced-sertoli-cell-injury-through-a-disruption-of-f-actin-and-microtubule-organization-is-mediated-by-akt1-2
#10
Ying Gao, Haiqi Chen, Xiang Xiao, Wing-Yee Lui, Will M Lee, Dolores D Mruk, C Yan Cheng
A correction to this article has been published and is linked from the HTML version of this paper. The error has been fixed in the paper.
July 26, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28743395/biomonitoring-of-fluoroalkylated-substances-in-antarctica-seabird-plasma-development-and-validation-of-a-fast-and-rugged-method-using-on-line-concentration-liquid-chromatography-tandem-mass-spectrometry
#11
Gabriel Munoz, Pierre Labadie, Emmanuel Geneste, Patrick Pardon, Sabrina Tartu, Olivier Chastel, Hélène Budzinski
We report on a fast, accurate and rugged analytical procedure to determine a wide span of perfluoroalkyl and polyfluoroalkyl substances (PFASs) in seabird plasma. The 26 investigated compounds included perfluoroalkyl carboxylates (C5-C14 PFCAs), perfluoroalkyl sulfonates (C4, C6, C7, C8, C10 PFSAs), perfluorooctane sulfonamide (FOSA) and N-alkyl derivatives (MeFOSA, EtFOSA), N-alkyl perfluorooctane sulfonamido acetic acids (MeFOSAA, EtFOSAA), fluorotelomer sulfonates (4:2 FTSA, 6:2 FTSA, 8:2 FTSA), polyfluoroalkyl phosphate diesters (diPAPs) and perfluorooctane sulfonamide phosphate diester (diSAmPAP)...
July 10, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28738507/gender-specific-associations-between-serum-isomers-of-perfluoroalkyl-substances-and-blood-pressure-among-chinese-isomers-of-c8-health-project-in-china
#12
Wen-Wen Bao, Zhengmin Min Qian, Sarah Dee Geiger, Echu Liu, Yimin Liu, Si-Quan Wang, Wayne R Lawrence, Bo-Yi Yang, Li-Wen Hu, Xiao-Wen Zeng, Guang-Hui Dong
Previous studies have demonstrated associations of perfluoroalkyl substances (PFASs), a group of highly persistent chemicals ubiquitous in wildlife and humans, with hypertension, but the relationships are mixed. Furthermore, academic literature on the relationship between isomers of PFASs and blood pressure (BP) and hypertension in populations from a higher pollution area is scant. We studied 1612 Chinese adults, ages 22-96years old, from Shenyang, China, utilizing high performance liquid chromatography-mass spectrometry to analyze isomers of perfluorooctanesulfonate (PFOS), perfluorooctanoate (PFOA), and other PFASs in blood serum...
July 18, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28733818/occurrence-and-distribution-of-six-selected-endocrine-disrupting-compounds-in-surface-and-groundwaters-of-the-romagna-area-north-italy
#13
Emanuela Pignotti, Marinella Farré, Damià Barceló, Enrico Dinelli
Endocrine disrupting compounds (EDCs) are a wide group of contaminants of emerging concern known to be harmful for organisms. The aim of the study was to assess the occurrence and distribution of six EDCs (estrone-E1, ß-estradiol-E2, 17α-ethinylestradiol-EE2, bisphenol A-BPA, perfluooctanoic acid-PFOA, perfluorooctane sulfonate-PFOS) in the Apenninic rivers and groundwaters of the Romagna area (North of Italy). Groundwaters were unaffected by EDC contamination, while all classes of compounds were detected at concentrations above the method quantification limit (MQL) in the majority of the river bodies...
July 21, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28732399/analysis-of-emerging-organic-contaminants-in-water-fish-and-suspended-particulate-matter-spm-in-the-joint-danube-survey-using-solid-phase-extraction-followed-by-uhplc-ms-ms-and-gc-ms-analysis
#14
Robert Loos, Simona Tavazzi, Giulio Mariani, Gert Suurkuusk, Bruno Paracchini, Gunther Umlauf
In the third Joint Danube Survey (JDS3), emerging organic contaminants were analysed in the dissolved water phase of samples from the Danube River and its major tributaries. Analyses were performed using solid-phase extraction (SPE) followed by ultra-high-pressure liquid chromatography triple-quadrupole mass spectrometry (UHPLC-MS-MS) and gas chromatography-mass spectrometry (GC-MS). The polar organic compounds analysed by UHPLC-MS-MS were 1H-benzotriazole, methylbenzotriazoles, carbamazepine, 10,11-dihydro-10,11-dihydroxy-carbamazepine, diclofenac, sulfamethox-azole, 2,4-D (2,4-dichlorophenoxyacetic acid), MCPA (2-methyl-4-chlorophenoxyacetic acid), metolachlor, cybutryne (irgarol), terbutryn, DEET (N,N-diethyl-m-toluamide), and several perfluoroalkyl acids (C6-C9; C8=perfluorooctanoic acid (PFOA)) and perfluorooctansulfonic acid (PFOS)...
July 17, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28724225/seasonal-variations-in-the-occurrence-of-perfluoroalkyl-substances-in-water-sediment-and-fish-samples-from-ebro-delta-catalonia-spain
#15
Emanuela Pignotti, Gemma Casas, Marta Llorca, Anil Tellbüscher, David Almeida, Enrico Dinelli, Marinella Farré, Damià Barceló
The main objective of this study was to assess the concentration levels and the seasonal variations of 13 poly- and perfluoroalkyl substances (PFASs) in different compartments (water, sediments and fish) of the Ebro Delta (NE Spain) and surrounding coastal areas. Perfluorooctanoic acid (PFOA) was the most frequently detected compound in waters and sediments. Perfluorocarboxylic acids (PFCAs) were the compounds found at the highest concentrations in water samples. On the other hand, sediments were more enriched in perfluorooctanesulfonate (PFOS) (range<1...
July 14, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28721589/recent-developments-in-polyfluoroalkyl-compounds-research-a-focus-on-human-environmental-health-impact-suggested-substitutes-and-removal-strategies
#16
John Baptist Nzukizi Mudumbi, Seteno Karabo Obed Ntwampe, Tandi Matsha, Lukhanyo Mekuto, Elie Fereche Itoba-Tombo
Between the late 1940s and early 1950s, humans manufactured polyfluoroalkyl compounds (PFCs) using electrochemical fluorination and telomerisation technologies, whereby hydrogen atoms are substituted by fluorine atoms, thus conferring unnatural and unique physicochemical properties to these compounds. Presently, there are wide ranges of PFCs, and owing to their bioaccumulative properties, they have been detected in various environmental matrices and in human sera. It has thus been suggested that they are hazardous...
August 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28712295/closing-the-mass-balance-on-fluorine-on-papers-and-textiles
#17
Alix E Robel, Kristin Marshall, Margaret Dickinson, David Lunderberg, Craig Butt, Graham Peaslee, Heather M Stapleton, Jennifer A Field
Papers and textiles that are treated with per- and polyfluoroalkyl substances (PFASs) are sources of human and environmental exposure. Data for individual PFASs, such as perfluorooctanesulfonate (PFOS) and perfluorooctanoate (PFOA), are not placed into the context of total fluorine for papers and textiles. Gas chromatography-mass spectrometry (GC-MS) and liquid chromatography-tandem mass spectrometry (LC-MS/MS) were used to quantify volatile and ionic PFASs, respectively, and the total oxidizable precursor (TOP) assay was used to quantify precursors that form perfluoroalkyl carboxylates...
July 28, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28709101/the-impact-of-prenatal-perfluoroalkyl-substances-exposure-on-neonatal-and-child-growth
#18
Mei-Huei Chen, Sharon Ng, Chia-Jung Hsieh, Ching-Chun Lin, Wu-Shiun Hsieh, Pau-Chung Chen
BACKGROUND: Perfluoroalkyl substances (PFASs) are wildly distributed environmental pollutants. Laboratory mice exposed prenatally to PFASs develop smaller birth weight but are more likely to become obese in adulthood. The evidences in human studies are still inconclusive. METHODS: The participants were 429 mother-infant pairs from Taiwan Birth Panel Study. These children were followed serially and growth data were collected through face to face interviews and records in Child Healthcare Handbooks until 108months of age...
July 11, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28704677/hydrated-electron-based-decomposition-of-perfluorooctane-sulfonate-pfos-in-the-vuv-sulfite-system
#19
Yurong Gu, Tongzhou Liu, Hongjie Wang, Huili Han, Wenyi Dong
As one of the most reactive species, hydrated electron (eaq(-)) is promising for reductive decomposition of recalcitrant organic pollutants, such as perfluorooctane sulfonate (PFOS). In this study, PFOS decomposition using a vacuum ultraviolet (VUV)/sulfite system was systematically investigated in comparison with sole VUV and ultraviolet (UV)/sulfite systems. A fast and nearly complete (97.3%) PFOS decomposition was observed within 4h from its initial concentration of 37.2μM in the VUV/sulfite system. The observed rate constant (kobs) for PFOS decomposition in the studied system was 0...
July 10, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28704675/effect-of-single-wall-carbon-nanotubes-on-bioconcentration-and-toxicity-of-perfluorooctane-sulfonate-in-zebrafish-danio-rerio
#20
Yaxuan Li, Bin Men, Yi He, Haiming Xu, Meiqi Liu, Dongsheng Wang
The wide application of nanoparticles will lead its release into the aquatic environment, which may alter the bioavailability and toxicity of other contaminants to aquatic organisms. This work aimed to study the effects of perfluorooctane sulfonate (PFOS), single-wall carbon nanotubes (SWCNT), and their mixture on PFOS accumulation, antioxidant defenses and acetylcholinesterase (AChE) activity in zebrafish. The fish was dissected after being exposed (24, 48, 72 and 96h) separately to PFOS, SWCNT and PFOS+SWCNT co-exposure...
July 10, 2017: Science of the Total Environment
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