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Hexachlorobenzene

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https://www.readbyqxmd.com/read/29454218/atmospheric-pattern-of-volatile-organochlorine-compounds-and-hexachlorobenzene-in-the-surroundings-of-a-chlor-alkali-plant
#1
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
#2
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
#3
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
#4
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
#5
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)...
December 29, 2017: 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
#6
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
https://www.readbyqxmd.com/read/29287182/persistent-organic-pollutants-skull-size-and-bone-density-of-polar-bears-ursus-maritimus-from-east-greenland-1892-2015-and-svalbard-1964-2004
#7
Tobias Daugaard-Petersen, Rikke Langebæk, Frank F Rigét, Robert J Letcher, Lars Hyldstrup, Jens-Erik Bech Jensen, Thea Bechshoft, Øystein Wiig, Bjørn Munro Jenssen, Cino Pertoldi, Eline D Lorenzen, Rune Dietz, Christian Sonne
We investigated skull size (condylobasal length; CBL) and bone mineral density (BMD) in polar bears (Ursus maritimus) from East Greenland (n = 307) and Svalbard (n = 173) sampled during the period 1892-2015 in East Greenland and 1964-2004 at Svalbard. Adult males from East Greenland showed a continuous decrease in BMD from 1892 to 2015 (linear regression: p < 0.01) indicating that adult male skulls collected in the early pre-pollution period had the highest BMD. A similar decrease in BMD over time was not found for the East Greenland adult females...
December 26, 2017: Environmental Research
https://www.readbyqxmd.com/read/29277037/environmental-pollutant-hexachlorobenzene-induces-hypertension-in-a-rat-model
#8
Rocío Castilla, Agustín Asuaje, Stéphanie Rivière, Caimi Giselle Romero, Pedro Martín, Gabriel Cao, Diana Kleiman de Pisarev, Verónica Milesi, Laura Alvarez
Hexachlorobenzene (HCB) is a dioxin-like environmental pollutant, widely distributed in the environment. New research links exposure to high levels of persistent organic environmental toxicants to cardiovascular disease, however little is known about the effect of HCB on vascular function and on blood pressure. The purpose of the present study was to evaluate biochemical and cardiovascular changes resulting from subchronic HCB exposure. Adult female Sprague-Dawley rats were treated with vehicle or HCB (5 or 500 mg/kg b...
November 22, 2017: Chemosphere
https://www.readbyqxmd.com/read/29276959/biota-monitoring-under-the-water-framework-directive-on-tissue-choice-and-fish-species-selection
#9
Annette Fliedner, Heinz Rüdel, Nina Lohmann, Georgia Buchmeier, Jan Koschorreck
The study addresses the topic of suitable matrices for chemical analysis in fish monitoring and discusses the effects of data normalization in the context of the European Water Framework Directive (WFD). Differences between species are considered by comparing three frequently monitored species of different trophic levels, i.e., chub (Squalius cephalus, n = 28), (bream, Abramis brama, n = 11), and perch (Perca fluviatilis, n = 19) sampled in the German Danube. The WFD priority substances dioxins, furans and dioxin-like polychlorinated biphenyls (PCDD/F + dl-PCB), polybrominated diphenyl ethers (PBDE), α-hexabromocyclododecane (α-HBCDD), hexachlorobenzene (HCB), mercury (Hg), and perfluorooctane sulfonic acid (PFOS) as well as non-dioxin-like (ndl)-PCB were analyzed separately in fillet and carcass and whole body concentrations were calculated...
December 22, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/29247036/erratum-for-ito-et-al-identification-of-the-hcb-gene-operon-involved-in-catalyzing-aerobic-hexachlorobenzene-dechlorination-in-nocardioides-sp-strain-pd653
#10
Koji Ito, Kazuhiro Takagi, Akio Iwasaki, Naoto Tanaka, Yu Kanesaki, Fabrice Martin-Laurent, Shizunobu Igimi
No abstract text is available yet for this article.
January 1, 2018: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/29175406/evaluation-of-carbon-isotope-fractionation-during-anaerobic-reductive-dehalogenation-of-chlorinated-and-brominated-benzenes
#11
Seo Yean Sohn, Kevin Kuntze, Ivonne Nijenhuis, Max M Häggblom
Compound specific stable isotope analysis (CSIA) has been established as a useful tool to evaluate in situ biodegradation. Here, CSIA was used to determine microbial dehalogenation of chloro- and bromobenzenes in microcosms derived from Hackensack River sediments. Gas chromatography-isotope ratio mass spectrometry (GC-IRMS) was used to measure carbon isotope fractionation during reductive dehalogenation of hexachlorobenzene (HCB), pentachlorobenzene (PeCB), 1,2,3,5-tetrachlorobenzene (TeCB), 1,2,3,5-tetrabromobenzene (TeBB), and 1,3,5-tribromobenzene (TriBB)...
November 20, 2017: Chemosphere
https://www.readbyqxmd.com/read/29146212/the-current-environmental-levels-of-endocrine-disruptors-mercury-cadmium-organochlorine-pesticides-and-pcbs-in-a-belgian-adult-population-and-their-predictors-of-exposure
#12
Catherine Pirard, Stephanie Compere, Katty Firquet, Corinne Charlier
A human biomonitoring study was carried out measuring the levels of endocrine disruptors in 252 participants (18-76 years old) recruited between February and May 2015 from the general population of Liege Province (Belgium). In this study, we reported the recent levels of cadmium and mercury in urine, some organochlorine pesticides and polychlorinated biphenyls (PCBs) in serum, and their relations to demographic characteristics, lifestyle behaviors and dietary habits. The median urinary levels of mercury and cadmium were 0...
October 31, 2017: International Journal of Hygiene and Environmental Health
https://www.readbyqxmd.com/read/29128804/hexachlorobenzene-as-a-persistent-organic-pollutant-toxicity-and-molecular-mechanism-of-action
#13
REVIEW
Beata Starek-Świechowicz, Bogusława Budziszewska, Andrzej Starek
Hexachlorobenzene (HCB) is an organochlorine pesticide widely distributed in the environment. Chronic exposure of humans to HCB leads to a number of effects, such as triggering of porphyria, microsomal enzyme induction, thyroid dysfunctions, neurological symptoms, and immunological disorders. In animals, HCB induced hepatic porphyria, neurotoxic effects, and toxic effects on the thyroid function, reproductive system, and immune system. HCB as a dioxin-like compound and a weak ligand of the aryl hydrocarbon receptor (AhR) is a hormonal disruptor...
July 1, 2017: Pharmacological Reports: PR
https://www.readbyqxmd.com/read/29113540/distinct-toxic-interactions-of-tio2-nanoparticles-with-four-coexisting-organochlorine-contaminants-on-algae
#14
Shuai Zhang, Rui Deng, Daohui Lin, Fengchang Wu
Engineered nanoparticles are increasingly discharged into the environment. After discharge, these nanoparticles can interact with co-existing organic contaminants, resulting in a phenomena referred to as 'joint toxicity'. This study evaluated joint toxicities of TiO2 nanoparticles (TiO2NPs) with four different (atrazine, hexachlorobenzene, pentachlorobenzene, and 3,3',4,4'-tetrachlorobiphenyl) organochlorine contaminants (OCs) toward algae (Chlorella pyrenoidosa). The potential mechanisms underlying the joint toxicity were discussed, including TiO2NPs-OC interactions, effects of TiO2NPs and OCs on biophysicochemical properties of algae and effects of TiO2NPs and OCs on each other's bioaccumulation in algae...
November 7, 2017: Nanotoxicology
https://www.readbyqxmd.com/read/29107350/dynamics-of-persistent-organic-pollutants-in-obese-adolescents-during-weight-loss
#15
Govindan Malarvannan, Kim Van Hoorenbeeck, Ann Deguchtenaere, Stijn L Verhulst, Eveline Dirinck, Luc Van Gaal, Philippe G Jorens, Adrian Covaci
We have investigated the dynamics of various persistent organic pollutants (POPs) in the serum of 94 obese adolescents (34 boys and 60 girls: age range 11-19years) before (0M) and after 5months (5M) of undergoing weight loss treatment. Six groups of POPs, such as polychlorinated biphenyls (PCBs), dichlorodiphenyltrichloroethane and its metabolites (DDTs), chlordane compounds (CHLs), hexachlorocyclohexane isomers (HCHs), hexachlorobenzene (HCB) and polybrominated diphenyl ethers (PBDEs), were detected in all samples in the decreasing order of median levels: DDTs>PCBs>HCB>HCHs>CHLs>PBDEs...
January 2018: Environment International
https://www.readbyqxmd.com/read/29106481/blood-concentrations-of-persistent-organic-pollutants-and-unhealthy-metabolic-phenotypes-in-normal-weight-overweight-and-obese-individuals
#16
Magda Gasull, Conxa Castell, Natàlia Pallarès, Carme Miret, José Pumarega, María Te Llez-Plaza, Tomàs López, Jordi Salas-Salvadó, Duk-Hee Lee, Albert Goday, Miquel Porta
Factors underlying metabolic phenotypes, such as the metabolically healthy but obese phenotype, remain unclear. Differences in metabolic phenotypes -particularly, among individuals with a similar body mass index- could be related to concentrations of persistent organic pollutants (POPs). No studies have analyzed POPs and metabolic phenotypes in normal-weight persons. The authors investigated the relationships between serum concentrations of POPs and metabolic phenotypes in 860 normal-weight, overweight, and obese participants in the 2002 Catalan Health Interview Survey (Spain)...
June 30, 2017: American Journal of Epidemiology
https://www.readbyqxmd.com/read/29105816/comparison-of-laboratory-derived-biomagnification-factors-for-hexachlorobenzene-in-common-carp-conducted-under-nine-test-conditions
#17
Naoki Hashizume, Yoshiyuki Inoue, Yasuyuki Suzuki, Hidekazu Murakami, Shinichiro Sumi, Takeshi Ishibashi, Tomohiko Yoshida
Nine dietary exposure bioaccumulation fish tests with hexachlorobenzene (HCB) were conducted with common carp to explore how differences in test conditions (different test foods and feeding rates) influenced the lipid-corrected, growth-corrected kinetic BMF (BMFKgL ) value (BMFKgL = BMFKg ×lipid content of test food / lipid content of test fish). The BMFKgL values for HCB differed by approximately a factor of 5 among the tests. The average, median, 95% confidential interval, and coefficient of variation of the BMFKgL values were 0...
November 4, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/29100182/transplacental-transfer-characteristics-of-organochlorine-pesticides-in-paired-maternal-and-cord-sera-and-placentas-and-possible-influencing-factors
#18
Xiaolan Zhang, Xia Wu, Bingli Lei, Ye Jing, Zi'an Jiang, Xinyu Zhang, Xiangming Fang, Yingxin Yu
Organochlorine pesticides (OCPs), including dichlorodiphenyltrichloroethane (DDT) and its metabolites [dichlorodiphenyldichloroethylene (DDE) and dichlorodiphenyldichloroethane], hexachlorocyclohexanes (HCHs), and hexachlorobenzene (HCB), are widely detected in humans despite the considerable decline in environmental concentrations. To understand the placental transfer of OCPs and the possible maternal influence on them, we measured the concentrations of DDTs, HCHs, and HCB in 102 paired samples of maternal and cord sera, and placentas collected in Shanghai, China...
October 31, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/29096317/maternal-and-paternal-serum-concentrations-of-persistent-organic-pollutants-and-the-secondary-sex-ratio-a-population-based-preconception-cohort-study
#19
Jisuk Bae, Sungduk Kim, Dana Boyd Barr, Germaine M Buck Louis
Recent declines in the secondary sex ratio (SSR), defined as the ratio of males to females at birth, in some industrialized countries may be attributed to exposure to environmental toxicants such as persistent organic pollutants (POPs). This study aimed to evaluate the association of couples' preconception exposure to POPs with the SSR. The study cohort comprised 235 couples who were enrolled in the Longitudinal Investigation of Fertility and the Environment (LIFE) Study between 2005 and 2009 prior to conception and prospectively followed through delivery of a singleton birth...
October 30, 2017: Environmental Research
https://www.readbyqxmd.com/read/29055783/prenatal-organochlorine-pesticide-exposure-and-the-disruption-of-steroids-and-reproductive-hormones-in-cord-blood-the-hokkaido-study
#20
Atsuko Araki, Chihiro Miyashita, Takahiko Mitsui, Houman Goudarzi, Futoshi Mizutani, Youichi Chisaki, Sachiko Itoh, Seiko Sasaki, Kazutoshi Cho, Kimihiko Moriya, Nobuo Shinohara, Katsuya Nonomura, Reiko Kishi
Certain organochlorine pesticides (OCPs) are designated as persistent organic pollutants and are regulated in many countries. The effects of OCPs on pediatric endocrinology are a concern; however, only limited data exist from human studies on maternal OCP exposure and its effects on infants' hormone levels. This study was conducted as part of the Hokkaido Study Sapporo Cohort, a prospective birth cohort study in Japan. Participants included 514 women who enrolled at 23-35weeks of gestation between 2002 and 2005; maternal blood samples were collected in late pregnancy, and 29 OCPs were measured...
January 2018: Environment International
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