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Hexachlorobenzene

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https://www.readbyqxmd.com/read/29175406/evaluation-of-carbon-isotope-fractionation-during-anaerobic-reductive-dehalogenation-of-chlorinated-and-brominated-benzenes
#1
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
#2
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
#3
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
#4
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
#5
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
#6
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
#7
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
#8
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
#9
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
#10
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
https://www.readbyqxmd.com/read/29054665/spatial-and-temporal-variations-in-the-atmospheric-concentrations-of-stockholm-convention-organochlorine-pesticides-in-kuwait
#11
Bondi Gevao, Massimiliano Porcelli, Smitha Rajagopalan, Divya Krishnan, Karell Martinez-Guijarro, Hassan Alshemmari, Majed Bahloul, Jamal Zafar
The study reports fortnightly atmospheric concentrations of organochlorine pesticides concomitantly measured at an urban, "industrial" and a remote location over a twelve month period in Kuwait to examine seasonal variability and urban-rural concentration gradients. The average±SD (and range) of the ΣOC concentrations measured throughout the study period in decreasing order were urban, 505±305 (range, 33-1352) pgm(-3), remote, 204±124 (4.5-556) pgm(-3), and "industrial" 155±103 (8.8-533) pgm(-3). The concentrations of most OCs measured in this study, except for DDT and its metabolites, were higher at urban locations relative to their concentrations at remote location, in line with the literature on POPs regarding urban conurbations being sources of industrial chemicals...
October 17, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28993587/determination-of-three-organochlorine-pesticides-in-aqueous-samples-by-solid-phase-extraction-based-on-natural-nano-diatomite-in-packed-syringe-coupled-to-gas-chromatography-mass-spectrometry
#12
Abdollah Taghani, Nasser Goudarzi, Ghadamali Bagherian, Mansour Arab Chamjangali
A rapid, simple, and sensitive technique is proposed based on a miniaturized solid-phase extraction method named mictroextraction in a packed syringe coupled with gas chromatography-mass spectrometry for the preconcentration and determination of three organochlorine pesticides. These include hexachlorobenzene, heptachlor and aldrine in aqueous samples. For the first time, the natural nano diatomite is used a sorbent. Based on this technique, 6.0 mg of the nano sorbent is inserted in a syringe between two polypropylene frits...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28988099/chlorinated-persistent-organic-pollutants-in-serum-of-new-zealand-adults-2011-2013
#13
J Coakley, P Bridgen, M N Bates, J Douwes, A 't Mannetje
A national survey was conducted in 2011-2013 to assess serum concentrations of persistent organic pollutants (POPs) in adult New Zealanders. Participants were randomly selected from the 2010 Electoral Roll within 64 demographic strata according to 4 age groups, 4 regions, 2 ethnic groups (Māori/non-Māori) and gender. Eligible subjects (n=734) donated up to 30ml of blood, after which serum was pooled (n=49) according to demographic strata prior to analysis by GC-HRMS. Associations between demographic variables (age, region, ethnicity, gender) and serum POPs were assessed using linear regression...
February 15, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/28964601/residues-of-hexachlorobenzene-and-chlorinated-cyclodiene-pesticides-in-the-soils-of-the-campanian-plain-southern-italy
#14
Chengkai Qu, Stefano Albanese, Annamaria Lima, Jiji Li, Angela L Doherty, Shihua Qi, Benedetto De Vivo
A systematic grid sampling method and geostatistics were employed to investigate the spatial distribution, inventory, and potential ecological and human health risks of the residues of hexachlorobenzene (HCB) and chlorinated cyclodiene pesticides in soils of the Campanian Plain, Italy, and explore their relationship with the soils properties. The geometric mean (Gmean) concentrations of HCB and cyclodiene compounds followed the order CHLs (heptachlor, heptachlor epoxide, trans-chlordane, and cis-chlordane) > DRINs (aldrin, dieldrin, and endrin) > SULPHs (α-endosulfan, β-endosulfan, and endosulfan sulfate) > HCB...
December 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28942276/augmenting-atrazine-and-hexachlorobenzene-degradation-under-different-soil-redox-conditions-in-a-bioelectrochemistry-system-and-an-analysis-of-the-relevant-microorganisms
#15
Hui Wang, Xian Cao, Lei Li, Zhou Fang, Xianning Li
Soil microbial fuel cells (MFCs) are a sustainable technology that degrades organic pollutants while generating electricity. However, there have been no detailed studies of the mechanisms of pollutant degradation in soil MFCs. In this study, the effects of external resistance and electrode effectiveness on atrazine and hexachlorobenzene (HCB) degradation were evaluated, the performance of soil MFCs in the degradation of these pollutants under different soil redox conditions was assessed, and the associated microorganisms in the anode were investigated...
January 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28925251/understanding-and-predicting-the-fate-of-semivolatile-organic-pesticides-in-a-glacier-fed-lake-using-a-multimedia-chemical-fate-model
#16
Xiaolin Wu, Cleo L Davie-Martin, Christine Steinlin, Kimberly J Hageman, Nicolas J Cullen, Christian Bogdal
Melting glaciers release previously ice-entrapped chemicals to the surrounding environment. As glacier melting accelerates under future climate warming, chemical release may also increase. This study investigated the behavior of semivolatile pesticides over the course of one year and predicted their behavior under two future climate change scenarios. Pesticides were quantified in air, lake water, glacial meltwater, and streamwater in the catchment of Lake Brewster, an alpine glacier-fed lake located in the Southern Alps of New Zealand...
October 17, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28923513/a-dioxin-like-compound-induces-hyperplasia-and-branching-morphogenesis-in-mouse-mammary-gland-through-alterations-in-tgf-%C3%AE-1-and-aryl-hydrocarbon-receptor-signaling
#17
Noelia Miret, Eva Rico-Leo, Carolina Pontillo, Elsa Zotta, Pedro Fernández-Salguero, Andrea Randi
Hexachlorobenzene (HCB) is a widespread environmental pollutant and a dioxin-like compound that binds weakly to the aryl hydrocarbon receptor (AhR). Because AhR and transforming growth factor β1 (TGF-β1) converge to regulate common signaling pathways, alterations in this crosstalk might contribute to developing preneoplastic lesions. The aim of this study was to evaluate HCB action on TGF-β1 and AhR signaling in mouse mammary gland, through AhR+/+ and AhR-/- models. Results showed a differential effect in mouse mammary epithelial cells (NMuMG), depending on the dose: 0...
November 1, 2017: Toxicology and Applied Pharmacology
https://www.readbyqxmd.com/read/28905218/health-risk-assessment-of-an-abandoned-herbicide-factory-site-for-transportation-use-in-dalian-china
#18
Nannan Ji, Shushen Zhang, Yun Zhang, Yu Chen
An abandoned herbicide factory site was used as an example of how planning should be considered for development of the site for transportation use in Dalian, China. Exposure pathways and parameters for three types of transportation use (land for a traffic hub, land for an urban road, and land for a subway) were developed. Twenty-five sampling sites were selected and 38 soil samples were collected in March 2015. Hexachlorobenzene and benzo(a)pyrene which were extracted by Soxhlet extraction and detected by gas chromatography mass spectrometry were the most significant pollutants detected...
November 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28905184/energy-transfer-and-kinetics-in-mechanochemistry
#19
Zhiliang Chen, Shengyong Lu, Qiongjing Mao, Alfons Buekens, Yuting Wang, Jianhua Yan
Mechanochemistry (MC) exerts extraordinary degradation and decomposition effects on many chlorinated, brominated, and even fluorinated persistent organic pollutants (POPs). However, its application is still limited by inadequate study of its reaction kinetic aspects. In the present work, the ball motion and energy transfer in planetary ball mill are investigated in some detail. Almost all milling parameters are summarised in a single factor-total effective impact energy. Furthermore, the MC kinetic between calcium oxide/Al and hexachlorobenzene is well established and modelled...
November 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28869886/persistent-organic-pollutants-in-red-crowned-cranes-grus-japonensis-from-hokkaido-japan
#20
Kensaku Kakimoto, Kazuhiko Akutsu, Haruna Nagayoshi, Yoshimasa Konishi, Keiji Kajimura, Naomi Tsukue, Tomoo Yoshino, Fumio Matsumoto, Takeshi Nakano, Ning Tang, Kazuichi Hayakawa, Akira Toriba
The red-crowned crane (Grus japonensis) from eastern Hokkaido is classified as a Special Natural Monument in Japan. In this study, we determined the concentrations of persistent organic pollutants (POPs) in red-crowned crane muscle tissues (n = 47). Polychlorinated biphenyls (PCBs) had the highest median concentration (240ng/g lipid weight), followed by dichlorodiphenyltrichloroethane and its metabolites (DDTs) (150ng/g lipid weight), chlordane-related compounds (CHLs) (36ng/g lipid weight), hexachlorobenzene (HCB) (16ng/g lipid weight), hexachlorocyclohexanes (HCHs) (4...
January 2018: Ecotoxicology and Environmental Safety
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