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Hexachlorobenzene

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https://www.readbyqxmd.com/read/29923341/organochlorine-pesticide-residues-in-human-breast-tissue-and-their-relationships-with-clinical-and-pathological-characteristics-of-breast-cancer
#1
Rachel E Ellsworth, Paul J Kostyniak, Lai-Har Chi, Craig D Shriver, Nicholas S Costantino, Darrell L Ellsworth
Agricultural pesticides are abundant environmental contaminants worldwide, prompting interest in studying their possible detrimental health effects. We examined organochlorine residues by quadrant (n = 245) in breast adipose tissues from 51 women with various stages of breast health to determine patterns of bioaccumulation within the breast and to assess relationships with patient clinical characteristics. Three organochlorine residues-2,2-bis(p-chlorophenyl)-1,1-dichloroethylene (p,p'-DDE), hexachlorobenzene (HCB), and mirex-assayed by high resolution gas chromatography were abundant in breast tissue...
June 19, 2018: Environmental Toxicology
https://www.readbyqxmd.com/read/29913573/seasonal-soil-snow-air-exchange-of-semivolatile-organic-pollutants-at-a-coastal-arctic-site-troms%C3%A3-69%C3%A2-n
#2
Paulo Casal, Javier Castro-Jiménez, Mariana Pizarro, Athanasios Katsoyiannis, Jordi Dachs
Soils are a major reservoir of semivolatile organic pollutants such as polychlorinated biphenyls (PCBs) and polycyclic aromatic hydrocarbons (PAHs), and exert a control on their atmospheric occurrence. We present here an assessment of the atmospheric occurrence and seasonality of soil/snow-air partitioning and exchange of PCBs, PAHs, hexachlorobenzene (HCB), and hexachlorocyclohexanes (HCHs) in the arctic city Tromsø, northern Norway. The fugacities of the organic pollutants in soils and snow were determined using a soil fugacity sampler by equilibrating the air concentrations with those in the surface soil/snow...
September 15, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29912347/prenatal-and-postnatal-exposure-to-persistent-organic-pollutants-pops-and-attention-deficit-and-hyperactivity-disorder-adhd-a-pooled-analysis-of-seven-european-birth-cohort-studies
#3
Joan Forns, Hein Stigum, Birgit Bjerre Høyer, Isabelle Sioen, Eva Sovcikova, Nikola Nowack, Maria-Jose Lopez-Espinosa, Mònica Guxens, Jesús Ibarluzea, Matias Torrent, Jürgen Wittsiepe, Eva Govarts, Tomas Trnovec, Cecile Chevrier, Gunnar Toft, Martine Vrijheid, Nina Iszatt, Merete Eggesbø
Background: Attention-deficit/hyperactivity disorder (ADHD) is increasing worldwide for reasons largely unknown and environmental chemicals with neurotoxic properties, such as persistent organic pollutants (POPs), have been proposed to play a role. We investigated the association between prenatal and postnatal exposure to polychlorinated biphenyl-153 (PCB-153), p-p´-dichlorodiphenyldichloroethylene (p-p'-DDE) and hexachlorobenzene (HCB) and ADHD in childhood. Methods: We pooled seven European birth cohort studies encompassing 4437 mother-child pairs from the general population with concentrations of PCB-153, p-p´-DDE and HCB measured in cord blood, maternal blood or milk...
April 17, 2018: International Journal of Epidemiology
https://www.readbyqxmd.com/read/29890834/synthesis-of-graphene-like-films-by-electrochemical-reduction-of-polyhalogenated-aromatic-compounds-and-their-electrochemical-capacitor-applications
#4
Züleyha Kudaş, Emre G Uuml R, Duygu Ekinci
Graphene is a promising two-dimensional nanomaterial for many applications due to its exciting properties. In the last decade, a variety of techniques ‒each with its own set of advantages and disadvantages‒ have been developed to prepare graphene, and there are ongoing efforts to improve these techniques and to reveal new approaches. Here, we describe a simple and low‒cost process for the bottom‒up synthesis of graphene‒like films. This new methodology involves a two‒step procedure: (i) formation of polyaromatic ring structures by the repeated covalent coupling of aryl radicals generated from electrochemical reduction of polyhalogenated aromatic compounds in aprotic solvent, and (ii) production of carbon networks by heating of polyaromatic surface films...
June 11, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29890598/increased-levels-of-persistent-organic-pollutants-in-serum-one-year-after-a-great-weight-loss-in-humans-are-the-levels-exceeding-health-based-guideline-values
#5
Aina Jansen, Anuschka Polder, Mette H B Müller, Eystein Skjerve, Jan Aaseth, Jan L Lyche
BACKGROUND: With the growing prevalence of obesity, an increased number of bariatric surgeries are being performed. Lipophilic persistent organic pollutants (POPs) are stored in adipose tissue, and an increased release of lipophilic POPs into the blood circulation may occur following rapid weight loss such as after bariatric surgery. OBJECTIVES: To evaluate and compare POP levels in serum before and after bariatric surgery, and to assess if the POP levels exceeded health based guideline values, with particular focus on women of childbearing age (WCBA)...
May 1, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29851746/persistent-organic-chlorinated-compound-residues-in-the-breast-milk-of-agricultural-workers
#6
Kafiye Eroğlu, Yavuz Kürşad Daş, Zehra Gölbaşi, Zeynep Şimşek, Fatma Koruk, Enes Atmaca
OBJECTIVE: This retrospective descriptive study aimed to investigate organochlorine compounds in women who breastfeed and work as a seasonal agricultural worker (SAW). METHODS: It was carried out on 100 woman working as SAW. Data were collected with a questionnaire by face-to-face interview and analyzed the residues of 27 items of organochlorine pesticides, Dichlorodiphenyltrichloroethane (DDT) metabolites and polychlorinated biphenyls, from persistent organic pollutants in mothers'50 mL breast milk...
May 30, 2018: Journal of Occupational and Environmental Medicine
https://www.readbyqxmd.com/read/29807283/differences-in-phytoaccumulation-of-organic-pollutants-in-freshwater-submerged-and-emergent-plants
#7
Senrong Fan, Hang Liu, Guomao Zheng, Yilin Wang, Shuran Wang, Yong Liu, Xueqin Liu, Yi Wan
Plants play an important role as sinks for or indicators of semivolatile organic pollutants, however most studies have focused on terrestrial plants and insufficient information has been obtained on aquatic plants to clarify the accumulation of organic pollutants via air-to-leaf vs. water-to-leaf pathways. The presence of p, p'-dichlorodiphenyldichloroethylene (p, p'-DDE), hexachlorobenzene (HCB), 15 polycyclic aromatic hydrocarbons (PAHs), and 9 substituted PAHs (s-PAHs), including oxy-PAHs and sulfur-PAHs, in 10 submerged and emergent plants collected from Lake Dianchi was analyzed in this study...
May 25, 2018: Environmental Pollution
https://www.readbyqxmd.com/read/29804048/a-50-year-retrospective-of-persistent-organic-pollutants-in-the-fat-and-eggs-of-penguins-of-the-southern-ocean
#8
Daniel S Ellis, Caio V Z Cipro, Camden A Ogletree, Kathryn E Smith, Richard B Aronson
Persistent organic pollutants (POPs) such as dichlorodiphenyltrichloroethanes (DDTs), hexachlorobenzene (HCB), hexachlorocyclohexanes (HCHs), and polychlorinated biphenyls (PCBs) have been spreading to Antarctica for over half a century. Penguins are effective indicators of pelagic concentrations of POPs. We synthesized the literature on penguins to assess temporal trends of pelagic contamination in Antarctica, using fat and eggs to monitor changes from 1964 to 2011. DDT/DDE ratios suggest long-range atmospheric transport...
May 24, 2018: Environmental Pollution
https://www.readbyqxmd.com/read/29799069/the-history-of-hexachlorobenzene-accumulation-in-svalbard-fjords
#9
A Pouch, A Zaborska, K Pazdro
In the present study, we investigated the spatial and historical trends of hexachlorobenzene (HCB) contamination in dated sediments of three Svalbard fjords (Kongsfjorden, Hornsund, Adventfjorden) differing in environmental conditions and human impact. HCB concentrations ranging from below limit of quantification (6.86 pg/g d.w.) to 143.99 pg/g d.w. were measured. The highest concentrations were measured in two surface sediment layers of the core collected in Hornsund near the melting glacier. The lowest concentrations of HCB were measured in Adventfjorden, suggesting that local source of HCB is not significant and global transport processes are the major transport pathways...
May 24, 2018: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/29764339/determination-of-plasma-concentrations-of-organochlorine-pesticides-and-polychlorinated-biphenyls-in-pet-cats-and-dogs
#10
Oguzhan Yavuz, Handan Hilal Arslan, Cagatay Esin, Yavuz Kursad Das, Abdurrahman Aksoy
The aim of this study was the determination of plasma concentrations of organochlorine pesticides (OCPs) and polychlorinated biphenyls (PCBs) in cats and dogs and evaluation of their prevalence and possible effects. The concentrations of nine OCPs, such as α-hexachlorocyclohexane (HCH), β-HCH, γ-HCH, hexachlorobenzene (HCB), aldrin, 2,4'-dichlorodiphenyltrichloroethane (2,4'-DDT), 4,4'-DDT, 2,4'-dichlorodiphenyldichloroethylene (2,4'-DDE) and 4,4'-DDE and 16 PCBs (PCB-28, -52, -70, -74, -81, -99, -101, -118, -138, -153, -156, -170, -180, -183, -187 and -208) were evaluated in the plasma samples of pet cats ( n = 15) and dogs ( n = 21)...
January 1, 2018: Toxicology and Industrial Health
https://www.readbyqxmd.com/read/29735800/potential-molecular-targets-of-statins-in-the-prevention-of-hepatocarcinogenesis
#11
Ezequiel Ridruejo, Giselle Romero-Caími, María J Obregón, Diana Kleiman de Pisarev, Laura Alvarez
Hepatocellular carcinoma (HCC) represents 90% of liver tumors. Statins, may reduce the incidence of various tumors, including HCC. Antitumoral activities may be mediated by changes in transforming growth factor-beta (TGF-β1) and thyroid hormones (TH) regulation. AIM: The aim of our study is to establish the statins mechanism of action and the potential key molecules involved in an in vivo and in vitro HCC model. MATERIALS AND METHODS: We used two models: in vivo (in rats) using diethylnitrosamine (DEN) and hexachlorobenzene (HCB) to develop HCC, we analyzed cell proliferation parameters (proliferating cell nuclear antigen, PCNA) and cholesterol metabolism (hydroxy-methylglutaryl-CoA reductase, HMGCoAR)...
April 9, 2018: Annals of Hepatology
https://www.readbyqxmd.com/read/29727940/multi-component-determination-of-atmospheric-semi-volatile-organic-compounds-in-soils-and-vegetation-from-tarragona-county-catalonia-spain
#12
Noelia Domínguez-Morueco, Mariana Carvalho, Jordi Sierra, Marta Schuhmacher, José Luis Domingo, Nuno Ratola, Martí Nadal
Tarragona County (Spain) is home to the most important chemical/petrochemical industrial complex in Southern Europe, which raises concerns about the presence and effects of the numerous environmental contaminants. In order to assess the levels and patterns of five classes of semi-volatile organic compounds (SVOCs) - polycyclic aromatic hydrocarbons (PAHs), synthetic musks (SMs), polychlorinated biphenyls (PCBs), brominated flame retardants (BFRs) and one organochlorine pesticide, hexachlorobenzene (HCB), 27 samples of soil and vegetation (Piptatherum L...
August 1, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29712742/persistent-organochlorine-pollutants-in-plasma-blood-pressure-and-hypertension-in-a-longitudinal-study
#13
Carolina Donat-Vargas, Agneta Åkesson, Andreas Tornevi, Maria Wennberg, Johan Sommar, Hannu Kiviranta, Panu Rantakokko, Ingvar A Bergdahl
Persistent organochlorine pollutants (POPs) have shown to be involved in the atherosclerotic process and to cause endothelial cell dysfunction. To assess longitudinally whether plasma concentrations of different POPs were associated with blood pressure and risk of hypertension in middle-aged women and men. Study subjects were 850 participants in the VIP (Västerbotten Intervention Programme) with 2 blood samples and blood pressure measurements, 10 years apart, during 1990 to 2003 (baseline) and during 2000 to 2013 (follow-up)...
June 2018: Hypertension
https://www.readbyqxmd.com/read/29702570/dechlorination-of-hexachlorobenzene-in-contaminated-soils-using-a-nanometallic-al-cao-dispersion-mixture-optimization-through-response-surface-methodology
#14
Yuhui Jiang, Yixuan Shang, Shuyao Yu, Jianguo Liu
Hexachlorobenzene (HCB) contamination of soils remains a significant environmental challenge all over the world. Reductive stabilization is a developing technology that can decompose the HCB with a dechlorination process. A nanometallic Al/CaO (n-Al/CaO) dispersion mixture was developed utilizing ball-milling technology in this study. The dechlorination efficiency of HCB in contaminated soils by the n-Al/CaO grinding treatment was evaluated. Response surface methodology (RSM) was employed to investigate the effects of three variables (soil moisture content, n-Al/CaO dosage and grinding time) and the interactions between these variables under the Box-Behnken Design (BBD)...
April 27, 2018: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/29698872/a-nested-case-control-study-of-polychlorinated-biphenyls-organochlorine-pesticides-and-thyroid-cancer-in-the-janus-serum-bank-cohort
#15
Catherine C Lerro, Rena R Jones, Hilde Langseth, Tom K Grimsrud, Lawrence S Engel, Andreas Sjödin, Hyoyoung Choo-Wosoba, Paul Albert, Mary H Ward
BACKGROUND: Polychlorinated biphenyls (PCBs) and organochlorine pesticides have been associated with altered thyroid hormone levels in humans, but their relationship with thyroid cancer is unknown. METHODS: We conducted a nested case-control study of thyroid cancer in the Norwegian Janus Serum Bank cohort using pre-diagnostic blood samples from 1972 to 1985. Incident thyroid cancer (n = 108) was ascertained through 2008. Controls were matched 2:1 by age, date of blood draw, gender, and county...
August 2018: Environmental Research
https://www.readbyqxmd.com/read/29627546/differential-contribution-of-animal-and-vegetable-food-items-on-persistent-organic-pollutant-serum-concentrations-in-spanish-adults-data-from-bioambient-es-project
#16
Juan Pedro Arrebola, Argelia Castaño, Marta Esteban, Mónica Bartolomé, Beatriz Pérez-Gómez, Juan José Ramos
Diet is considered the main source of Persistent Organic Pollutant (POP) exposure in the general population, although there are still several gaps of knowledge regarding the differential contribution of main food groups. The aim of this study was to identify dietary patterns that contribute to human exposure to organochlorine pesticides (OCPs), polychlorinated biphenyls (PCBs), and Perfluoroalkyl Substances (PFASs). Study population (n=1880, 18-65years old) was recruited during 2009-2010 in all the main geographical areas of Spain...
September 1, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29621723/persistent-organic-pollutants-as-predictors-of-increased-fsh-lh-ratio-in-naturally-cycling-reproductive-age-women
#17
Mia V Gallo, Julia Ravenscroft, David O Carpenter, Lawrence M Schell, Akwesasne Task Force On The Environment
Although several recent studies suggest endocrine disrupting compounds, such as polychlorinated biphenyls (PCBs), dichlorodiphenyldichloroethylene (p,p', DDE), and hexachlorobenzene (HCB), target different organs and systems in the body, their impact on female reproductive function in humans is not well characterized. We seek to determine the relationship between several known endocrine disrupting compounds and a marker of ovarian responsivity, the FSH:LH ratio (higher ratio indicates less ovarian responsivity)...
July 2018: Environmental Research
https://www.readbyqxmd.com/read/29621717/circulating-levels-of-perfluoroalkyl-substances-and-left-ventricular-geometry-of-the-heart-in-the-elderly
#18
Ingrid Mobacke, Lars Lind, Linda Dunder, Samira Salihovic, P Monica Lind
AIMS: Some persistent organic pollutants (POPs) such as hexachlorobenzene (HCB) and some polychlorinated biphenyls (PCBs) have been shown to interfere with myocardial function and geometry. We therefore investigated if also another group of POPs: per- and polyfluoroalkyl substances (PFASs) were associated with alterations in left ventricular geometry. METHODS: 801 subjects aged 70 years were investigated in a cross-sectional study within the scope of the Prospective Investigation of the Vasculature in Uppsala Seniors (PIVUS) study...
June 2018: Environment International
https://www.readbyqxmd.com/read/29609149/mechanochemical-formation-of-chlorinated-phenoxy-radicals-and-their-roles-in-the-remediation-of-hexachlorobenzene-contaminated-soil
#19
Shanshan Deng, Nannan Feng, Shaoguo Kang, Jianxin Zhu, Bo Yu, Jing Chen, Xiaofeng Xie
Mechanochemical degradation (MCD) is a promising eco-friendly method to dispose persistent organic pollutants (POPs). Mechanically induced free-radical attack was thought to be one of the key elements in initiating and accelerating the dechlorination and degradation of POPs. In this study, mechanochemical formation of free-radicals and their roles in the remediation of hexachlorobenzene (HCB) contaminated soil were explored using both of experimental analysis and quantum chemical calculations. It was found that chlorinated phenoxy radicals(CB-O) can be produced in the milling process and they played a vital role in the dechlorination of HCB, based on the results of electron spin-resonance (ESR) and X-ray photoelectron spectra (XPS)...
June 15, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29606316/mobile-dynamic-passive-sampling-of-trace-organic-compounds-evaluation-of-sampler-performance-in-the-danube-river
#20
Branislav Vrana, Foppe Smedes, Ian Allan, Tatsiana Rusina, Krzysztof Okonski, Klára Hilscherová, Jiří Novák, Peter Tarábek, Jaroslav Slobodník
A "dynamic" passive sampling (DPS) device, consisting of an electrically driven large volume water pumping device coupled to a passive sampler exposure cell, was designed to enhance the sampling rate of trace organic compounds. The purpose of enhancing the sampling rate was to achieve sufficient method sensitivity, when the period available for sampling is limited to a few days. Because the uptake principle in the DPS remains the same as for conventionally-deployed passive samplers, free dissolved concentrations can be derived from the compound uptake using available passive sampler calibration parameters...
March 29, 2018: Science of the Total Environment
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