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Hexachlorobenzene

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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
#1
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...
April 5, 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
#2
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)...
April 2, 2018: Environmental Research
https://www.readbyqxmd.com/read/29621717/circulating-levels-of-perfluoroalkyl-substances-and-left-ventricular-geometry-of-the-heart-in-the-elderly
#3
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...
April 2, 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
#4
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)...
March 26, 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
#5
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
https://www.readbyqxmd.com/read/29605991/deriving-in-vivo-bioconcentration-factors-of-a-mixture-of-fragrance-ingredients-using-a-single-dietary-exposure-and-internal-benchmarking
#6
Chang-Er L Chen, Karin Löfstrand, Margaretha Adolfsson-Erici, Michael S McLachlan, Matthew MacLeod
Chemicals in mixtures that are hydrophobic with logKow > 4 are potentially bioaccumulative. Here, we evaluate an abbreviated and benchmarked in vivo BCF measurement methodology by exposing rainbow trout to a mixture of eight test chemicals found in fragrance substances and three benchmark chemicals (musk xylene (MX), hexachlorobenzene (HCB) and PCB52) via a single contaminated feeding event followed by a 28-day depuration period. Concentrations of HCB and PCB52 in fish did not decline significantly (their apparent depuration rate constants - kT were close to zero), while kT for MX was 0...
March 31, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29594537/a-nanoporous-carbon-material-coated-onto-steel-wires-for-solid-phase-microextraction-of-chlorobenzenes-prior-to-their-quantitation-by-gas-chromatography
#7
Hu Cheng, Yang Song, Yongrong Bian, Fang Wang, Rongting Ji, Wenxiang He, Chenggang Gu, Gangfeng Ouyang, Xin Jiang
A nanoporous carbon material was synthesized by heating potassium citrate without using a template or an activating agent. It is shown to represent a viable coating for use in solid-phase microextraction. The material is thermally stable and mainly consists of amorphous sheets of sp2 -bonded carbon. It has an extensive pore structure and a surface area as large as 1236 m2 ·g-1 . The nanoporous carbon was deposited on the surface of steel wires, and the resulting fibers were applied to the extraction of trace levels of chlorobenzenes in water samples...
December 18, 2017: Mikrochimica Acta
https://www.readbyqxmd.com/read/29587212/first-evaluation-of-the-use-of-down-feathers-for-monitoring-persistent-organic-pollutants-and-organophosphate-ester-flame-retardants-a-pilot-study-using-nestlings-of-the-endangered-cinereous-vulture-aegypius-monachus
#8
Laura Monclús, Manel Lopez-Bejar, Javier De la Puente, Adrian Covaci, Veerle L B Jaspers
Raptor feathers have been increasingly used to assess pollutants in ecotoxicological monitoring studies. However, the suitability of down feathers to detect pollutants has not yet been investigated. In this study, concentrations of persistent organic pollutants (POPs) and organophosphate ester flame retardants (OPEs) were assessed in down and juvenile contour feathers of Spanish cinereous vulture (Aegypius monachus) nestlings (circa 73 days old) and contaminant concentrations were compared between both types of feathers from the same individuals...
March 24, 2018: Environmental Pollution
https://www.readbyqxmd.com/read/29560787/identification-of-sex-specific-dna-methylation-changes-driven-by-specific-chemicals-in-cord-blood-in-a-faroese-birth-cohort
#9
Yuet-Kin Leung, Bin Ouyang, Liang Niu, Changchun Xie, Jun Ying, Mario Medvedovic, Aimin Chen, Pal Weihe, Damaskini Valvi, Philippe Grandjean, Shuk-Mei Ho
Faroe islanders consume marine foods contaminated with methylmercury (MeHg), polychlorinated biphenyls (PCBs), and other toxicants associated with chronic disease risks. Differential DNA methylation at specific CpG sites in cord blood may serve as a surrogate biomarker of health impacts from chemical exposures. We aimed to identify key environmental chemicals in cord blood associated with DNA methylation changes in a population with elevated exposure to chemical mixtures. We studied 72 participants of a Faroese birth cohort recruited between 1986 and 1987 and followed until adulthood...
March 21, 2018: Epigenetics: Official Journal of the DNA Methylation Society
https://www.readbyqxmd.com/read/29559297/inhibition-of-ccl-formation-during-the-combustion-of-msw-gasification-syngas-an-experimental-study-on-the-synergism-and-competition-between-oxidation-and-chlorination
#10
Rui-Zhi Zhang, Ren-Hao Yin, Yong-Hao Luo
For the safe disposal of MSW, a four-step gasification-combustion conversion process is proposed in this work, consisting of material gasification, ash melting, syngas conversion and combustion. Based on the control method of dioxin in gasification process which has been studied previously, experiments of tar chlorination process under oxidative atmospheres were carried out in a homogeneous flow reaction system, using benzene as the tar model compound, to find a way for the inhibition of CCl formation during the syngas combustion process...
March 17, 2018: Waste Management
https://www.readbyqxmd.com/read/29525969/time-trend-tendency-1988-2014-years-of-organochlorine-pesticide-levels-in-the-adipose-tissue-of-veracruz-inhabitants
#11
Ana Laura Calderón-Garcidueñas, Stefan M Waliszewski, Rubén Ruiz-Ramos, María Del Carmen Martinez-Valenzuela
The population that lives in areas where organochlorine pesticides were spread in the past is still exposed to them through contaminated food, particulate matter, and vapors. Due to their lipophilic properties and resistance to metabolic reactions, they accumulate in tissues and fluids rich in lipids. The aim of the study was to monitor the concentrations of organochlorine pesticides in forensic adipose tissue samples of adult inhabitants of Veracruz City, Mexico, and compare their time trend levels from 1988 to 2014...
March 10, 2018: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/29522985/persistent-organic-pollutants-and-penile-bone-mineral-density-in-east-greenland-and-canadian-polar-bears-ursus-maritimus-during-1996-2015
#12
Tobias Daugaard-Petersen, Rikke Langebæk, Frank F Rigét, Markus Dyck, Robert J Letcher, Lars Hyldstrup, Jens-Erik Bech Jensen, Rune Dietz, Christian Sonne
Persistent organic pollutants (POPs) are long-range transported to the Arctic via atmospheric and oceanic currents, where they biomagnify to high concentrations in the tissues of apex predators such as polar bears (Ursus maritimus). A major concern of POP exposure is their physiological effects on vital organ-tissues posing a threat to the health and survival of polar bears. Here we examined the relationship between selected POPs and baculum bone mineral density (BMD) in the East Greenland and seven Canadian subpopulations of polar bears...
March 6, 2018: Environment International
https://www.readbyqxmd.com/read/29501890/distribution-sources-and-air-soil-exchange-of-ocps-pcbs-and-pahs-in-urban-soils-of-nepal
#13
Balram Pokhrel, Ping Gong, Xiaoping Wang, Mengke Chen, Chuanfei Wang, Shaopeng Gao
Due to the high temperature and extensive use of organochlorine pesticides (OCPs), polychlorinated biphenyls (PCBs) and polycyclic aromatic hydrocarbons (PAHs), tropical cities could act as secondary sources of these pollutants and therefore received global concern. As compared with other tropical cities, studies on the air-soil exchange of OCPs, PCBs and PAHs in tropical Nepali cities remained limited. In the present study, 39 soil samples from Kathmandu (capital of Nepal) and 21 soil samples from Pokhara (second largest city in Nepal) were collected The soil concentrations of the sum of endosulfans (α- and β-endosulfans) ranged from 0...
February 20, 2018: Chemosphere
https://www.readbyqxmd.com/read/29477570/persistent-organic-pollutants-and-risk-of-type-2-diabetes-a-prospective-investigation-among-middle-aged-women-in-nurses-health-study-ii
#14
Geng Zong, Damaskini Valvi, Brent Coull, Thomas Göen, Frank B Hu, Flemming Nielsen, Philippe Grandjean, Qi Sun
BACKGROUND: Exposure to persistent organic pollutants (POPs) may predispose to the development of type 2 diabetes (T2D), but prospective human evidence is scarce. OBJECTIVES: We investigated the association between plasma-POP concentrations in the late 1990s and incident T2D over 11 years of follow-up in the Nurses' Health Study II. DISCUSSION: Three organochlorine pesticides and 20 polychlorinated biphenyls (PCBs) were measured in banked plasma from 793 case-control pairs of T2D...
February 21, 2018: Environment International
https://www.readbyqxmd.com/read/29454218/atmospheric-pattern-of-volatile-organochlorine-compounds-and-hexachlorobenzene-in-the-surroundings-of-a-chlor-alkali-plant
#15
Barend L van Drooge, Esther Marco, Joan O Grimalt
The outdoor atmospheric distributions of chlorinated volatile organic compounds (VOCs) from locations receiving the emissions of a chlor-alkali plant have been studied. Trichloroethylene and tetrachloroethylene (medians 2.4 μg/m 3 and 1.7 μg/m 3 , respectively) were the most abundant compounds, which was in accordance with the production processes from these installations. The concentrations of trichlorofluoromethane, median 1.6 μg/m 3 , are rather similar to the average levels described in general in the troposphere and cannot be attributed to this specific source...
February 14, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29438900/sperm-quality-biomarkers-complement-reproductive-and-endocrine-parameters-in-investigating-environmental-contaminants-in-common-carp-cyprinus-carpio-from-the-lake-mead-national-recreation-area
#16
Jill A Jenkins, Michael R Rosen, Rassa O Draugelis-Dale, Kathy R Echols, Leticia Torres, Carla M Wieser, Constance A Kersten, Steven L Goodbred
Lake Mead National Recreational Area (LMNRA) serves as critical habitat for several federally listed species and supplies water for municipal, domestic, and agricultural use in the Southwestern U.S. Contaminant sources and concentrations vary among the sub-basins within LMNRA. To investigate whether exposure to environmental contaminants is associated with alterations in male common carp (Cyprinus carpio) gamete quality and endocrine- and reproductive parameters, data were collected among sub-basins over 7 years (1999-2006)...
February 10, 2018: Environmental Research
https://www.readbyqxmd.com/read/29421399/high-plasma-organochlorine-pesticide-levels-are-related-to-increased-biological-age-as-calculated-by-dna-methylation-analysis
#17
P Monica Lind, Samira Salihovic, Lars Lind
BACKGROUND: Organochlorine pesticides (OCPs) have been shown in the experimental setting to alter DNA methylation. Since DNA methylation changes during the life-span, formulas have been presented to calculate "DNA methylation age" as a measure of biological age. OBJECTIVES: We aimed to investigate if circulating levels of three OCPs were related to increased DNA methylation age METHODS: 71CpG DNA methylation age (Hannum formula) was calculated based on data from the Illumina 450 k Bead Methylation chip in 1000 subjects in the Prospective Study of the Vasculature in Uppsala Seniors (PIVUS) study (50% women, all aged 70 years at the examination)...
February 1, 2018: Environment International
https://www.readbyqxmd.com/read/29396583/determination-of-hexachlorobutadiene-pentachlorobenzene-and-hexachlorobenzene-in-waste-incineration-fly-ash-using-ultrasonic-extraction-followed-by-column-cleanup-and-gc-ms-analysis
#18
Haiyan Zhang, Lei Jiang, Xin Zhou, Tao Zeng, Zhiqiao He, Xinwen Huang, Jianmeng Chen, Shuang Song
Hexachlorobutadiene (HCBD) was listed as a new controlling persistent organic pollutant in the Stockholm Convention because of its wide industrial applications and potential genotoxicity and carcinogenicity. However, only limited information exists on the release of HCBD from unintentional sources, such as waste incineration. Identification and quantification of HCBD in fly ash, one of the major outputs of waste incineration, is imperative. This work presents a simple method for determining HCBD in waste incineration fly ash based on ultrasonic extraction coupled with a silica gel-Florisil column cleanup followed by gas chromatography-mass spectrometry detection...
February 2, 2018: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29288298/persistent-organochlorine-pesticides-in-aquatic-environments-and-fishes-in-taiwan-and-their-risk-assessment
#19
Geng-Ruei Chang
Organochlorine pesticides (OCPs) are ubiquitous contaminants with high bioaccumulation and persistence in the environment; they can have adverse effects in humans and animals. This study examined residual concentrations in water, sediments, and fishes as well as the association between the health risks of OCPs and fish consumption in the Taiwanese population. Various water and sediment samples from Taiwanese aquaculture and fish samples from different sources were collected and analyzed through gas chromatography tandem mass spectrometry to determine the concentrations of 20 OCPs, namely, aldrin; cis-chlordane; trans-chlordane; dieldrin; endrin; alpha-endosulfan; beta-endosulfan; heptachlor; hexachlorobenzene; alpha-hexachlorocyclohexane; beta-hexachlorocyclohexane; lindane; mirex; pentachlorobenzene; o,p'-dichlorodiphenyltrichloroethane (DDT); p,p'-DDT; and DDT metabolites (o,p'-dichlorodiphenyldichloroethane [DDD]; p,p'-DDD; o,p'-dichlorodiphenyldichloroethylene [DDE]; and p,p'-DDE)...
March 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29287340/residue-behavior-of-organochlorine-pesticides-during-the-production-process-of-yogurt-and-cheese
#20
Jing Duan, Zheng Cheng, Jiawei Bi, Yangguang Xu
The presence of organochlorine pesticides (OCPs) in dairy products can lead to human exposure. This study investigated the behavior of OCP residues in milk during yogurt and cheese production. Gas chromatography with electron-capture detection (GC-ECD) was used to detect α-hexachlorocyclohexane (HCH), hexachlorobenzene (HCB), γ-HCH, g-chlordane, and α-chlordane in fresh milk, yogurt, and cheese. The results showed that fermentation reduced the residual concentration of OCPs in yogurt, with processing factors (PFs) ranging from 0...
April 15, 2018: Food Chemistry
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