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Hexachlorobenzene

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https://www.readbyqxmd.com/read/28806676/occurrence-and-air-soil-exchange-of-organochlorine-pesticides-and-polychlorinated-biphenyls-at-a-cawnet-background-site-in-central-china-implications-for-influencing-factors-and-fate
#1
Lingxi Zhan, Tian Lin, Zuwu Wang, Zhineng Cheng, Gan Zhang, Xiaopu Lyu, Hairong Cheng
Ambient air and soil samples were collected between March 2012 and March 2013 at Jinsha, a regional background site in central China, to measure the concentrations of organochlorine pesticides (OCPs) and polychlorinated biphenyls (PCBs). The average concentrations of total OCPs and total PCBs were 191 ± 107 and 39.4 ± 27.1 pg/m(3) in air (gaseous and particulate phase) and 0.585 ± 0.437 and 0.083 ± 0.039 ng/g in soil, respectively. The higher concentrations of p,p'-dichlorodiphenyltrichloroethane (p,p'-DDT) and p,p'-DDT/p,p'-DDE ratios in the soil indicated recent p,p'-DDT input to the soil...
August 4, 2017: Chemosphere
https://www.readbyqxmd.com/read/28806565/implications-of-biological-factors-on-accumulation-of-persistent-organic-pollutants-in-antarctic-notothenioid-fish
#2
J M Ríos, N B Lana, N F Ciocco, A Covaci, E Barrera-Oro, E Moreira, J C Altamirano
In the present study, the possible associations between selected persistent organic pollutants (POPs) and biological factors were assessed in different tissues of two Antarctic notothenioid fish: Notothenia rossii (NOR) and Trematomus newnesi (TRN) collected at Potter Cove, King George Island/Isla 25 de Mayo, South Shetland Islands. Specifically, association patterns between biological factors (body size, lipid content, body condition) and POP concentrations (polychlorinated biphenyls (PCBs), dichlorodiphenyltrichloroethane (DDT) and metabolites, polybrominated diphenyl ethers (PBDEs), and hexachlorocyclohexane (HCH), hexachlorobenzene (HCB), chlordanes (CHLs) and methoxylated polybrominated diphenyl ethers (MeO-PBDEs)), were explored by using two approaches: multivariate analyses (principal component analysis: PCA) and intraspecific correlations...
August 11, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28772178/effects-of-biochar-on-dechlorination-of-hexachlorobenzene-and-the-bacterial-community-in-paddy-soil
#3
Yang Song, Yongrong Bian, Fang Wang, Anna Herzberger, Xinglun Yang, Chenggang Gu, Xin Jiang
Anaerobic reductive dechlorination is an important degradation pathway for chlorinated organic contaminants in paddy soil. This study investigated the effects of amending paddy soil with wheat straw biochar on both the dechlorination of hexachlorobenzene (HCB), a typical highly chlorinated contaminant, and on the structure of soil bacteria communities. Soil amendment of 0.1% biochar did not significantly affect the dechlorination of HCB in the soil. However, biochar amendment at higher application levels (5%) stimulated the dechlorination of HCB in the first month of anaerobic incubation and inhibited the dechlorination of HCB after that period...
July 28, 2017: Chemosphere
https://www.readbyqxmd.com/read/28753526/influence-of-maternal-and-sociodemographic-characteristics-on-the-accumulation-of-organohalogen-compounds-in-argentinian-women-the-emasar-study
#4
Natalia Bravo, Solrunn Hansen, Inger Økland, Mercè Garí, Marisa V Álvarez, Silvina Matiocevich, Jon-Øyvind Odland, Joan O Grimalt
The occurrence of organohalogen compounds in venous serum from post-partum mothers from two Argentinian cities, Salta and Ushuaia, has been investigated (n = 698). 4,4'-DDE was the most abundant compound in these cities, with geometric means of 33 and 67ng/g lipid weight, respectively. City of residence, age and parity were the main determinants of the accumulation of these compounds. Hexachlorobenzene (HCB) was the second most abundant pollutant in Ushuaia, 8.7ng/g lipid, and β-hexachlorocyclohexane (β-HCH) in Salta, 7...
July 25, 2017: Environmental Research
https://www.readbyqxmd.com/read/28733287/identification-of-the-hcb-gene-operon-involved-in-catalyzing-aerobic-hexachlorobenzene-dechlorination-in-nocardioides-sp-strain-pd653
#5
Koji Ito, Kazuhiro Takagi, Akio Iwasaki, Naoto Tanaka, Yu Kanesaki, Fabrice Martin-Laurent, Shizunobu Igimi
Nocardioides sp. strain PD653 was the first aerobic bacterium capable of mineralizing hexachlorobenzene (HCB) that was identified. In this study, strain PD653-B2, which was unexpectedly isolated from a subculture of strain PD653, was found to lack the ability to transform HCB or pentachloronitrobenzene into pentachlorophenol. Comparative genome analysis of the two strains revealed that genetic rearrangement had occurred in strain PD653-B2, with a genomic region present in strain PD653 being deleted. In silico analysis allowed three open reading frames within this region to be identified as candidate genes involved in HCB dechlorination...
July 21, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28697468/emission-factors-of-unintentional-hcb-and-pecbz-and-their-correlation-with-pcdd-pcdf
#6
Wenwen Gong, Heidelore Fiedler, Xiaotu Liu, Bin Wang, Gang Yu
Hexachlorobenzene (HCB) and pentachlorobenzene (PeCBz) have been listed as unintentional POPs in the annex of the Stockholm Convention and thus, attracted attention by government and researchers. Since the intentional production and use has ceased in most countries, the unintentional releases to the environment have increased. This study gathered 206 and 78 emission factors (EFs) of unintentional HCB and PeCBz from scientific publications and governmental reports, respectively. Most of the EFs referred to the release vector "air" (EFAir) and to a less extent to "product" (EFProduct)...
July 8, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28682607/mechanism-and-rate-of-thermal-decomposition-of-hexachlorocyclopentadiene-and-its-importance-in-pcdd-f-formation-from-the-combustion-of-cyclodiene-pesticides
#7
Nirmala K Dharmarathne, John C Mackie, Eric M Kennedy, Michael Stockenhuber
Thermal decomposition of hexachlorocyclopentadiene (HCCP) has been studied in inert gas and under oxidative conditions in a silica flow reactor at a residence time of 5.0 s between 690 and 923 K and 1 atm pressure. Pyrolysis was initiated by Cl bond fission to form pentachlorocyclopentadienyl radical; two such radicals then combined to undergo a series of intramolecular rearrangements and Cl fissions, producing principally octachloronaphthalene (8ClNP) and Cl2. This process has been studied by quantum chemical calculation, and a reaction potential energy surface has been developed...
July 26, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28648904/mixture-effects-of-30-environmental-contaminants-on-incident-metabolic-syndrome-a-prospective-study
#8
Lars Lind, Samira Salihovic, Erik Lampa, P Monica Lind
BACKGROUND: Several cross-sectional studies have linked different environmental contaminants to the metabolic syndrome (MetS). However, mixture effects have not been investigated and no prospective studies exist regarding environmental contaminants and the MetS. OBJECTIVES: To study mixture effects of contaminants on the risk of incident MetS in a prospective fashion. METHODS: Our sample consisted of 452 subjects from the Prospective Study of the Vasculature in Uppsala Seniors (PIVUS) study (50% women, all aged 70years) free from the MetS at baseline, being followed for 10years...
June 22, 2017: Environment International
https://www.readbyqxmd.com/read/28634113/vitamin-d3-supplementation-attenuates-the-early-stage-of-mouse-hepatocarcinogenesis-promoted-by-hexachlorobenzene-fungicide
#9
Guilherme R Romualdo, Renata L Goto, Ana A H Fernandes, Bruno Cogliati, Luis F Barbisan
Hexachlorobezene (HCB), a fungicide widely distributed in the environment, promotes the development of hepatocellular preneoplastic lesions (PNL) and tumors in rodents. In contrast, vitamin D3 (VD3) supplementation presents a potential role for the prevention/treatment of chronic liver diseases. Thus, we investigated whether VD3 supplementation attenuates the early stage of HCB-promoted hepatocarcinogenesis. Female Balb/C mice were injected a single dose of diethylnitrosamine (DEN, 50 mg/kg) at postnatal day 15...
September 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/28616737/serum-concentrations-of-selected-organochlorine-pesticides-in-a-lebanese-population-and-their-associations-to-sociodemographic-anthropometric-and-dietary-factors-enasb-study
#10
Mireille Harmouche-Karaki, Joseph Matta, Khalil Helou, Yara Mahfouz, Nicole Fakhoury-Sayegh, Jean-François Narbonne
Organochlorine pesticides (OCPs) were banned by the Stockholm Convention many years ago; however, they are still detected in the environment due to their high persistence, their current illegal use, and their import from countries where they have not been banned. We evaluated the serum concentrations of selected OCPs (hexachlorobenzene (HCB), β-hexachlorocyclohexanes (β-HCH), p,p'-dichlorodiphenyltrichloroethane (DDT) and its metabolite p,p'-dichlorodiphenyldichloroethylene (DDE) in a sample of Lebanese adults using gas chromatography coupled to an ion trap mass spectrometer detector...
June 14, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28570991/from-antarctica-to-the-subtropics-contrasted-geographical-concentrations-of-selenium-mercury-and-persistent-organic-pollutants-in-skua-chicks-catharacta-spp
#11
Alice Carravieri, Yves Cherel, Maud Brault-Favrou, Carine Churlaud, Laurent Peluhet, Pierre Labadie, Hélène Budzinski, Olivier Chastel, Paco Bustamante
Seabirds integrate bioaccumulative contaminants via food intake and have revealed geographical trends of contamination in a variety of ecosystems. Pre-fledging seabird chicks are particularly interesting as bioindicators of chemical contamination, because concentrations in their tissues reflect primarily dietary sources from the local environment. Here we measured 14 trace elements and 18 persistent organic pollutants (POPs) in blood of chicks of skuas that breed in four sites encompassing a large latitudinal range within the southern Indian Ocean, from Antarctica (Adélie Land, south polar skua Catharacta maccormicki), through subantarctic areas (Crozet and Kerguelen Islands, brown skua C...
September 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28534402/passive-air-samplers-as-a-tool-for-assessing-long-term-trends-in-atmospheric-concentrations-of-semivolatile-organic-compounds
#12
Jiří Kalina, Martin Scheringer, Jana Borůvková, Petr Kukučka, Petra Přibylová, Pernilla Bohlin-Nizzetto, Jana Klánová
Many attempts have been made to quantify the relationship between the amount of persistent organic pollutants sequestered by passive air sampling devices and their actual concentrations in ambient air. However, this information may not be necessary for some applications. In this study, two sets of 30 ten-year-long time series of simultaneous passive and high-volume active air sampling carried out at the Košetice observatory in the Czech Republic were used for a comparison of temporal trends. Fifteen polyaromatic hydrocarbons, seven polychlorinated biphenyls and eight organochlorine pesticides were investigated...
June 12, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28486186/a-review-on-the-application-of-constructed-wetlands-for-the-removal-of-priority-substances-and-contaminants-of-emerging-concern-listed-in-recently-launched-eu-legislation
#13
REVIEW
Ana M Gorito, Ana R Ribeiro, C M R Almeida, Adrián M T Silva
The presence of organic pollutants in the aquatic environment, usually found at trace concentrations (i.e., between ng L(-1) and μg L(-1) or even lower, known as micropollutants), has been highlighted in recent decades as a worldwide environmental concern due to their difficult elimination by conventional water and wastewater treatment processes. The relevant information on constructed wetlands (CWs) and their application for the removal of a specific group of pollutants, 41 organic priority substances/classes of substances (PSs) and 8 certain other substances with environmental quality standards (EQS) listed in Directive 2013/39/EU as well as 17 contaminants of emerging concern (CECs) of the Watch List of Decision 2015/495/EU, is herein reviewed...
August 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28463822/organochlorine-pesticides-and-polychlorinated-biphenyls-in-human-adipose-tissue-from-northern-tunisia-current-extent-of-contamination-and-contributions-of-socio-demographic-characteristics-and-dietary-habits
#14
Amani Achour, Abdelkader Derouiche, Badreddine Barhoumi, Badreddine Kort, Driss Cherif, Sondes Bouabdallah, Mohsen Sakly, Khémais Ben Rhouma, Soufiane Touil, Mohamed Ridha Driss, Olfa Tebourbi
The aims of the present study were to investigate the current exposure levels of persistent organochlorine compounds (OCs) in adipose tissues intraoperatively collected from 40 patients over 20 years undergoing non-cancer-related surgery residing in Northern region of Tunisia (Bizerte), which constitutes an exemplary case, and examined association between levels of contamination and both socio-demographic characteristics and dietary habits. Concentration of hexachlorobenzene (HCB), hexachlorocyclohexane isomers (α-HCH, β-HCH, γ-HCH and δ-HCH), dichlorodiphenyltrichloroethane isomers (p,p'-DDT and o,p'-DDT) and metabolites (p,p'-DDE, o,p'-DDE, p,p'-DDD and o,p'-DDD) and 12 polychlorinated biphenyls (PCBs) congeners were measured using capillary gas chromatography with electron capture detector...
July 2017: Environmental Research
https://www.readbyqxmd.com/read/28438788/associations-between-persistent-organic-pollutants-type-2-diabetes-diabetic-nephropathy-and-mortality
#15
Brian A Grice, Robert G Nelson, Desmond E Williams, William C Knowler, Clinton Mason, Robert L Hanson, Kai McKeever Bullard, Meda E Pavkov
OBJECTIVE: Relationships were examined between persistent organic pollutants (POPs) and incident type 2 diabetes, end-stage renal disease (ESRD) and mortality. METHODS: In a nested case-control study, 300 persons without diabetes had baseline examinations between 1969 and 1974; 149 developed diabetes (cases) and 151 remained non-diabetic (controls) during 8.0 and 23.1 years of follow-up, respectively. POPs were measured at baseline. ORs for diabetes were computed by logistic regression analysis...
July 2017: Occupational and Environmental Medicine
https://www.readbyqxmd.com/read/28432626/temporal-trends-of-lipophilic-persistent-organic-pollutants-in-serum-from-danish-nulliparous-pregnant-women-2011-2013
#16
Christian Bjerregaard-Olesen, Manhai Long, Mandana Ghisari, Bodil H Bech, Ellen A Nohr, Niels Uldbjerg, Tine B Henriksen, Jørn Olsen, Eva C Bonefeld-Jørgensen
The use of the lipophilic persistent organic pollutants (POPs) including polychlorinated biphenyls (PCBs) and several organochlorine pesticides (OCPs) has been prohibited for more than 30 years. In this study, we present the temporal trends of the lipophilic POP serum concentrations in Danish nulliparous pregnant women between 2011 and 2013. We randomly selected 197 pregnant women (gestational age 11-13) from the Aarhus Birth Cohort. The concentrations of the lipophilic POPs in the serum samples were analyzed using gas chromatography...
July 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28414931/human-adipose-tissue-levels-of-persistent-organic-pollutants-and-metabolic-syndrome-components-combining-a-cross-sectional-with-a-10-year-longitudinal-study-using-a-multi-pollutant-approach
#17
Vicente Mustieles, Mariana F Fernández, Piedad Martin-Olmedo, Beatriz González-Alzaga, Andrés Fontalba-Navas, Russ Hauser, Nicolás Olea, Juan P Arrebola
We aimed to assess the influence of long-term exposure to POPs on the risk of metabolic syndrome, combining a cross-sectional with a 10-year longitudinal follow-up design. Residues of eight POPs were quantified in adipose tissue samples from 387 participants recruited between 2003 and 2004 in Granada province (Spain). The outcome ("metabolically compromised") was defined as having ≥1 diagnosis of type 2 diabetes, hypertension, hypertriglyceridemia, and/or low HDL cholesterol. The cross-sectional analysis was conducted in the initial cohort, while the 10-year longitudinal analysis was conducted in those 154 participants free of any of the so-mentioned metabolic diseases and classified as "metabolically healthy" at recruitment...
April 14, 2017: Environment International
https://www.readbyqxmd.com/read/28395858/association-between-exposure-to-organochlorine-compounds-and-maternal-thyroid-status-role-of-the-iodothyronine-deiodinase-1-gene
#18
Sabrina Llop, Mario Murcia, Mar Alvarez-Pedrerol, Joan O Grimalt, Loreto Santa-Marina, Jordi Julvez, Fernando Goñi-Irigoyen, Mercedes Espada, Ferran Ballester, Marisa Rebagliato, Maria-Jose Lopez-Espinosa
INTRODUCTION: Exposure to organochlorine compounds (OCs) may interfere with thyroid hormone (TH) homeostasis. The disruption of the deiodinase (DIO) enzymes has been proposed as a mechanism of action. AIM: To evaluate the association between exposure to OCs and TH status in pregnant women, as well as to explore the role of genetic variations in the DIO1 and DIO2 genes. METHODS: The study population (n=1128) was composed of pregnant women who participated in the INMA Project (Spain, 2003-2006)...
April 8, 2017: Environment International
https://www.readbyqxmd.com/read/28392239/organohalogenated-contaminants-in-plasma-and-eggs-of-rockhopper-penguins-does-vitellogenin-affect-maternal-transfer
#19
Nina Dehnhard, Veerle L B Jaspers, Laurent Demongin, Evi Van den Steen, Adrian Covaci, Rianne Pinxten, Glenn T Crossin, Petra Quillfeldt, Marcel Eens, Maud Poisbleau
Although many studies have investigated organohalogenated contaminants (OHCs) in yolk, little is known about the mechanisms and timing of transfer of OHCs from the female to the egg. Vitellogenin, a yolk precursor, has been suggested to play a role in this transport. We here report for the first time the temporal changes in OHC and an index of vitellogenin concentrations in female plasma from the pre-laying period to clutch completion in free-living birds: the southern rockhopper penguin (Eudyptes chrysocome chrysocome) breeding in the Falkland/Malvinas Islands...
July 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28384585/polyhalogenated-compounds-chlorinated-paraffins-novel-and-classic-flame-retardants-pops-in-dishcloths-after-their-regular-use-in-households
#20
Christoph Gallistl, Bianca Lok, Annika Schlienz, Walter Vetter
Dishcloths are routinely used in the clean-up process following daily kitchen activities and are thus subject to contamination commensurate with their frequent use. Here we analyzed dishcloths for the occurrence of polyhalogenated compounds after 14days of use in household kitchens. Analysis of 19 dishcloths revealed the presence of 29 polyhalogenated contaminants with total mean/median concentrations of 6,900/3,600ng/dishcloth, respectively. The spectrum featured classic and novel halogenated flame-retardants (HFRs) like polybrominated diphenyl ethers (PBDEs), hexabromocyclododecane (HBCD), decabromodiphenyl ethane (DBDPE), pentabromoethylbenzene (PBEB), chlordene plus and dechlorane plus, as well as typical chloropesticides and background contaminants (e...
October 1, 2017: Science of the Total Environment
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