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https://www.readbyqxmd.com/read/29146079/occurrence-of-chlorinated-volatile-organic-compounds-vocs-in-a-sanitary-sewer-system-implications-for-assessing-vapor-intrusion-alternative-pathways
#1
Mohammadyousef Roghani, Olivia P Jacobs, Anthony Miller, Evan J Willett, James A Jacobs, C Ricardo Viteri, Elham Shirazi, Kelly G Pennell
Sewer systems have been recently recognized as potentially important exposure pathways to consider during vapor intrusion assessments; however, this pathway has not been well-characterized and there is need for additional information about the occurrence of volatile organic compounds (VOCs) in sewer systems. This paper reports the results of sewer gas sampling conducted in a sanitary sewer over the years of 2014-2017. Sewer gas samples were collected and analyzed using several different techniques, including TO-15 (grab), TO-17 (passive), Radiello® (passive) and a novel continuous monitoring technique, the Autonomous Rugged Optical Multigas Analyzer (AROMA)...
November 13, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29129997/trichloroethylene-induced-alterations-in-dna-methylation-were-enriched-in-polycomb-protein-binding-sites-in-effector-memory-cd4-t-cells
#2
Kathleen M Gilbert, Sarah J Blossom, Brad Reisfeld, Stephen W Erickson, Kanan Vyas, Mary Maher, Brannon Broadfoot, Kirk West, Shasha Bai, Craig A Cooney, Sudeepa Bhattacharyya
Exposure to industrial solvent and water pollutant trichloroethylene (TCE) can promote autoimmunity, and expand effector/memory (CD62L) CD4(+) T cells. In order to better understand etiology reduced representation bisulfite sequencing was used to study how a 40-week exposure to TCE in drinking water altered methylation of ∼337 770 CpG sites across the entire genome of effector/memory CD4(+) T cells from MRL+/+ mice. Regardless of TCE exposure, 62% of CpG sites in autosomal chromosomes were hypomethylated (0-15% methylation), and 25% were hypermethylated (85-100% methylation)...
July 2017: Environmental Epigenetics
https://www.readbyqxmd.com/read/29129777/trichloroethylene-metabolite-s-1-2-dichlorovinyl-l-cysteine-induces-lipid-peroxidation-associated-apoptosis-via-the-intrinsic-and-extrinsic-apoptosis-pathways-in-a-first-trimester-placental-cell-line
#3
Elana R Elkin, Sean M Harris, Rita Loch-Caruso
Trichloroethylene (TCE), a prevalent environmental contaminant, is a potent renal and hepatic toxicant through metabolites such as S-(1, 2-dichlorovinyl)-l-cysteine (DCVC). However, effects of TCE on other target organs such as the placenta have been minimally explored. Because elevated apoptosis and lipid peroxidation in placenta have been observed in pregnancy morbidities involving poor placentation, we evaluated the effects of DCVC exposure on apoptosis and lipid peroxidation in a human extravillous trophoblast cell line, HTR-8/SVneo...
November 9, 2017: Toxicology and Applied Pharmacology
https://www.readbyqxmd.com/read/29128723/copper-mediated-reductive-dechlorination-by-green-rust-intercalated-with-dodecanoate
#4
Li-Zhi Huang, Zhou Yin, Nicola G A Cooper, Weizhao Yin, Emil Tveden Bjerglund, Bjarne W Strobel, Hans Christian B Hansen
A layered Fe(II)-Fe(III) hydroxide (green rust, GR) was intercalated with dodecanoate (known as GRC12) and then amended with Cu(II) (GRC12(Cu)) before reaction with chloroform (CF), carbon tetrachloride (CT), trichloroethylene (TCE) or tetrachloroethylene (PCE). Reduction of CT by GRC12(Cu) was 37 times faster than with GRC12 alone before the active Cu species was consumed. The Cu mediated reaction followed the dichloroelimination pathway as observed for GRC12 alone, with carbon monoxide (82.5%) and formate (26...
November 6, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29111242/effect-of-field-site-hydrogeochemical-conditions-on-the-corrosion-of-milled-zerovalent-iron-particles-and-their-dechlorination-efficiency
#5
Milica Velimirovic, Melanie Auffan, Luca Carniato, Vesna Micić Batka, Doris Schmid, Stephan Wagner, Daniel Borschneck, Olivier Proux, Frank von der Kammer, Thilo Hofmann
Milled zerovalent iron (milled ZVI) particles have been recognized as a promising agent for groundwater remediation because of (1) their high reactivity with chlorinated aliphatic hydrocarbons, organochlorine pesticides, organic dyes, and a number of inorganic contaminants, and (2) a possible greater persistance than the more extensively investigated nanoscale zerovalent iron. We have used laboratory-scale batch degradation experiments to investigate the effect that hydrogeochemical conditions have on the corrosion of milled ZVI and on its ability to degrade trichloroethene (TCE)...
October 27, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29105474/-preliminary-observation-on-imbalance-degree-of-blood-perfusion-on-the-twelve-yuan-source-points-in-healthy-subjects
#6
Peng-Na Zhao, Yan-Ping Wang, Fei-Fei Gu, Chao-Zheng Li, Yu-Long Wei, Guang-Jun Wang, Wei-Bo Zhang
OBJECTIVE: To lay a foundation for meridian diagnosis by measuring the blood perfusion (BP) on yuan-source points of twelve meridians and calculating the normal range of imbalance degree (IBD) of left and right meridian (IBD-LRM), IBD of exterior-interior meridian (IBD-EIM) and IBD of hand-foot of the same name meridians (IBD-HFM) in healthy subjects. METHODS: BP at yuan-source points of twelve meridians was measured on 31 healthy volunteers by a Laser Doppler Line Scanner (LDLS)...
October 25, 2017: Zhen Ci Yan Jiu, Acupuncture Research
https://www.readbyqxmd.com/read/29104449/application-of-ascorbic-acid-to-enhance-trichloroethene-degradation-by-fe-iii-activated-calcium-peroxide
#7
Xiang Zhang, Xiaogang Gu, Shuguang Lu, Mark L Brusseau, Minhui Xu, Xiaori Fu, Zhaofu Qiu, Qian Sui
The enhancement effect of an environmentally friendly reducing agent, ascorbic acid (AA), on trichloroethene (TCE) degradation by Fe(III)-activated calcium peroxide (CP) was evaluated. The addition of AA accelerated the transformation of Fe(III) to Fe(II), and the complexation of Fe(III)/Fe(II) with AA and its products alleviated the precipitation of dissolved iron. These impacts enhanced the generation of reactive oxygen species (ROSs). Investigation of ROSs using chemical probe tests, electron paramagnetic resonance (EPR) tests, and radical scavenger tests strongly confirm large production of hydroxyl radicals (HO•) that is responsible for TCE degradation...
October 1, 2017: Chemical Engineering Journal
https://www.readbyqxmd.com/read/29104369/an-efficient-catalytic-degradation-of-trichloroethene-in-a-percarbonate-system-catalyzed-by-ultra-fine-heterogeneous-zeolite-supported-zero-valent-iron-nickel-bimetallic-composite
#8
Muhammad Danish, Xiaogang Gu, Shuguang Lu, Mark L Brusseau, Ayyaz Ahmad, Muhammad Naqvi, Usman Farooq, Waqas Qamar Zaman, Xiaori Fu, Zhouwei Miao
Zeolite supported nano iron-nickel bimetallic composite (Z-nZVI-Ni) was prepared using a liquid-phase reduction process. The corresponding surface morphologies and physico-chemical properties of the Z-nZVI-Ni composite were determined using scanning electron microscopy (SEM), transmission electron microscopy (TEM), Energy dispersive X-ray spectra (EDS), Brunauer Emmett Teller (BET) adsorption, wide angle X-ray diffractometry (WA-XRD), and Fourier transform infrared spectroscopy (FTIR). The results indicated high dispersion of iron and nickel nano particles on the zeolite sheet with an enhanced surface area...
February 5, 2017: Applied Catalysis. A, General
https://www.readbyqxmd.com/read/29096957/an-assessment-of-correlations-between-chlorinated-voc-concentrations-in-tree-tissue-and-groundwater-for-phytoscreening-applications
#9
Candice M Duncan, Mark L Brusseau
The majority of prior phytoscreening applications have employed the method as a tool to qualitatively determine the presence of contamination in the subsurface. Although qualitative data is quite useful, this study explores the potential for using phytoscreening quantitatively. The existence of site-specific and non-site-specific (master) correlations between VOC concentrations in tree tissue and groundwater is investigated using data collected from several phytoscreening studies. The aggregated data comprise 100 measurements collected from 12 sites that span a wide range of site conditions...
October 30, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29074986/self-cleaning-liner-for-halogenated-hydrocarbon-control-in-landfill-leachate
#10
Shichong He, Lizhong Zhu
Sorptive landfill liners can prevent the migration of the leachate pollutants. However, their sorption ability will decrease over time. A method should be developed to maintain the sorption ability of landfill liners. In this study, we combined cetyltrimethylammonium bromide-bentonite (CTMAB-bentonite) and zero-valent iron (ZVI) to develop a self-cleaning liner that can retain its sorption ability for a long period. Batch experiments and calculation simulations were employed to analyse the sorption ability of this liner material and the ecological risk of halogenated hydrocarbons...
October 26, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29074266/effective-diffusion-coefficients-of-dnapl-waste-components-in-saturated-low-permeability-soil-materials
#11
Derya Ayral-Cinar, Avery H Demond
Diffusion is regarded as the dominant transport mechanism into and out of low permeable subsurface lenses and layers in the subsurface. But, some reports of mass storage in such zones are higher than what might be attributable to diffusion, based on estimated diffusion coefficients. Despite the importance of diffusion to efforts to estimate the quantity of residual contamination in the subsurface, relatively few studies present measured diffusion coefficients of organic solutes in saturated low permeability soils...
September 23, 2017: Journal of Contaminant Hydrology
https://www.readbyqxmd.com/read/29072068/cu-microbelt-network-embedded-in-colorless-polyimide-substrate-flexible-heater-platform-with-high-optical-transparency-and-superior-mechanical-stability
#12
Ji-Hyun Lee, Doo-Young Youn, Zhenhao Luo, Ji Young Moon, Seon-Jin Choi, Chanhoon Kim, Il-Doo Kim
Metal nanowires have been considered as essential components for flexible transparent conducting electrodes (TCEs) with high transparency and low sheet resistance. However, large surface roughness and high interwire junction resistance limit the practical use of metal wires as TCEs. Here, we report Cu microbelt network (Cu MBN) with coalescence junction and low surface roughness for next-generation flexible TCEs. In particular, the unique embedded structure of Cu MBN in colorless polyimide (cPI) film was achieved to reduce the surface roughness as well as enhance mechanical stability...
November 3, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29040813/developmental-neurotoxic-effects-of-a-low-dose-of-tce-on-3d-neurosphere-system
#13
Mohamed Elsaid Abdraboh, Sherif H Abdeen, Mohamed Salama, Mahmoud Elhussiny, Yasser M El-Sherbini, Nada M Eldeen
Trichloroethylene (TCE) is one of the industrial toxic products that ever-present in air, soil and water. Several studies illustrated the toxicity of high doses of TCE on several organs. This study aims to determine the toxic effect of a low dose of TCE on development of rat neural stem cells (NSCs). Rat pups brains were collected, minced and harvested cells were cultured in the presence of neural growth factors B27/N8 to develop neurospheres. Afterwards, cells were subjected to a dose of 1µM TCE for 1 and 2 weeks...
October 17, 2017: Biochemistry and Cell Biology, Biochimie et Biologie Cellulaire
https://www.readbyqxmd.com/read/29032099/roles-of-hydroxyl-and-sulfate-radicals-in-degradation-of-trichloroethene-by-persulfate-activated-with-fe-2-and-zero-valent-iron-insights-from-carbon-isotope-fractionation
#14
Yunde Liu, Aiguo Zhou, Yiqun Gan, Xiaoqian Li
Active species including hydroxyl (HO) and sulfate radicals (SO4(-)) play important roles in contaminant degradation during the persulfate based in-situ chemical oxidation (ISCO) process. The generation and contribution of active species are critical and can potentially be evaluated using compound specific isotope analysis (CSIA). However, the evaluation of stable isotope fractionation (or isotope enrichment factor ε values) for contaminants degraded by individual active species of concern is required but lacking...
October 8, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29022194/potential-for-cometabolic-biodegradation-of-1-4-dioxane-in-aquifers-with-methane-or-ethane-as-primary-substrates
#15
Paul B Hatzinger, Rahul Banerjee, Rachael Rezes, Sheryl H Streger, Kevin McClay, Charles E Schaefer
The objective of this research was to evaluate the potential for two gases, methane and ethane, to stimulate the biological degradation of 1,4-dioxane (1,4-D) in groundwater aquifers via aerobic cometabolism. Experiments with aquifer microcosms, enrichment cultures from aquifers, mesophilic pure cultures, and purified enzyme (soluble methane monooxygenase; sMMO) were conducted. During an aquifer microcosm study, ethane was observed to stimulate the aerobic biodegradation of 1,4-D. An ethane-oxidizing enrichment culture from these samples, and a pure culture capable of growing on ethane (Mycobacterium sphagni ENV482) that was isolated from a different aquifer also biodegraded 1,4-D...
October 11, 2017: Biodegradation
https://www.readbyqxmd.com/read/29020883/the-immune-response-in-trichloroethylene-hypersensitivity-syndrome-a-review
#16
Jia-Xiang Zhang, Na Li, Hui Wang, Tong Shen, Qi-Xing Zhu
Trichloroethylene (TCE) has been used for a variety of industrial and consumer cleaning purposes because of its ability to dissolve organic substances. The multisystem injuries include those of skin, liver, and kidney, which are defined as TCE hypersensitivity syndrome (THS). THS is a serious occupational health issue. However, the mechanism of immune dysfunction leading to organ injury is poorly understood. Many studies reveal that skin lesions and organ injury caused by TCE are consistent with type IV hypersensitivity, also called delayed hypersensitivity, mediated by T cells...
January 1, 2017: Toxicology and Industrial Health
https://www.readbyqxmd.com/read/28984458/pr2fecro6-a-type-i-multiferroic
#17
Nibedita Das, Satyendra Singh, Amish G Joshi, Meganathan Thirumal, V Raghavendra Reddy, Laxmi Chand Gupta, Ashok Kumar Ganguli
We synthesized double perovskite Pr2FeCrO6 by solid-state method. Analysis of its X-ray powder diffraction shows that the compound crystallizes in a centrosymmetric structure with space group Pbnm. Our X-ray photoelectron spectroscopy (XPS) studies show that all the cations are present in +3 oxidation state. Magnetization studies of Pr2FeCrO6 show that the material is paramagnetic at room temperature and undergoes a magnetic transition below TCM = 250 K. We observe clear magnetic hysteresis loop, for example, below 150 K...
November 6, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28984446/mechanochemically-sulfidated-microscale-zero-valent-iron-pathways-kinetics-mechanism-and-efficiency-of-trichloroethylene-dechlorination
#18
Yawei Gu, Binbin Wang, Feng He, Miranda J Bradley, Paul G Tratnyek
In water treatment processes that involve contaminant reduction by zerovalent iron (ZVI), reduction of water to dihydrogen is a competing reaction that must be minimized to maximize the efficiency of electron utilization from the ZVI. Sulfidation has recently been shown to decrease H2 formation significantly, such that the overall electron efficiency of (or selectivity for) contaminant reduction can be greatly increased. To date, this work has focused on nanoscale ZVI (nZVI) and solution-phase sulfidation agents (e...
November 7, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28975097/ameliorative-effect-of-vitamin-e-on-trichloroethylene-induced-nephrotoxicity-in-rats
#19
Mojgan Heydari, Massumeh Ahmadizadeh, Kambiz Ahmadi Angali
BACKGROUND: 1,1,2-Trichloroethylene (TCE) is an important organic solvent which is widespread in the environment. Work place exposure to TCE has been associated adverse effects in many organs including kidney. Vitamin E is an antioxidant that can overcome oxidative stress. OBJECTIVES: The aim of the present study is to examine the role of vitamin E against destructive effects of TCE on rat kidney. MATERIALS AND METHODS: A total of 35 male Wistar rats were randomly divided into seven groups of equal number in each...
July 2017: Journal of Nephropathology
https://www.readbyqxmd.com/read/28973557/editor-s-highlight-high-throughput-functional-genomics-identifies-modulators-of-tce-metabolite-genotoxicity-and-candidate-susceptibility-genes
#20
Vanessa Y De La Rosa, Jonathan Asfaha, Michael Fasullo, Alex Loguinov, Peng Li, Lee E Moore, Nathaniel Rothman, Jun Nakamura, James A Swenberg, Ghislaine Scelo, Luoping Zhang, Martyn T Smith, Chris D Vulpe
Trichloroethylene (TCE), an industrial chemical and environmental contaminant, is a human carcinogen. Reactive metabolites are implicated in renal carcinogenesis associated with TCE exposure, yet the toxicity mechanisms of these metabolites and their contribution to cancer and other adverse effects remain unclear. We employed an integrated functional genomics approach that combined functional profiling studies in yeast and avian DT40 cell models to provide new insights into the specific mechanisms contributing to toxicity associated with TCE metabolites...
November 1, 2017: Toxicological Sciences: An Official Journal of the Society of Toxicology
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