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Hexachlorobenzene

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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
#1
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
#2
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...
October 5, 2017: 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
#3
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...
September 27, 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
#4
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...
September 20, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28925251/understanding-and-predicting-the-fate-of-semi-volatile-organic-pesticides-in-a-glacier-fed-lake-using-a-multimedia-chemical-fate-model
#5
Xiaolin Wu, Cleo Lisa 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 semi-volatile 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 melt water, and stream water in the catchment of Lake Brewster, an alpine glacier-fed lake located in the Southern Alps of New Zealand...
September 19, 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
#6
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
#7
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...
September 14, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28905184/energy-transfer-and-kinetics-in-mechanochemistry
#8
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...
September 13, 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
#9
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...
September 1, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28869876/associations-between-internal-exposure-levels-of-persistent-organic-pollutants-in-adipose-tissue-and-deep-infiltrating-endometriosis-with-or-without-concurrent-ovarian-endometrioma
#10
Stéphane Ploteau, German Cano-Sancho, Christelle Volteau, Arnaud Legrand, Anaïs Vénisseau, Vincent Vacher, Philippe Marchand, Bruno Le Bizec, Jean-Philippe Antignac
Endometriosis is a gynaecological disease characterized by the presence of ectopic endometrial tissue. Histologically, it appears as different sub-types, being peritoneal endometriosis, ovarian endometrioma (OvE) and deep infiltrating endometriosis (DIE), which are of major relevance due to their varying clinical presentations. A number of persistent organic pollutants (POPs) have been associated with the onset of endometriosis, yet the overall set of existing studies remains fairly divergent. In this preliminary case-control study we aimed to assess the potential associations between the internal exposure to POPs and the presence of DIE with or without concurrent OvE...
September 1, 2017: Environment International
https://www.readbyqxmd.com/read/28843531/testing-lagoonal-sediments-with-early-life-stages-of-the-copepod-acartia-tonsa-dana-an-approach-to-assess-sediment-toxicity-in-the-venice-lagoon
#11
Marco Picone, Martina Bergamin, Eugenia Delaney, Annamaria Volpi Ghirardini, Kresten Ole Kusk
The early-life stages of development of the calanoid copepod Acartia tonsa from egg to copepodite I is proposed as an endpoint for assessing sediment toxicity by exposing newly released eggs directly onto the sediment-water interface. A preliminary study of 5 sediment samples collected in the lagoon of Venice highlighted that the larval development rate (LDR) and the early-life stages (ELS) mortality endpoints with A. tonsa are more sensitive than the standard amphipod mortality test; moreover LDR resulted in a more reliable endpoint than ELS mortality, due to the interference of the sediment with the recovery of unhatched eggs and dead larvae...
August 24, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28841469/catalytic-oxidation-of-pcdd-f-on-a-v2o5-wo3-tio2-catalyst-effect-of-chlorinated-benzenes-and-chlorinated-phenols
#12
Longjie Ji, Xuan Cao, Shengyong Lu, Cuicui Du, Xiaodong Li, Tong Chen, Alfons Buekens, Jianhua Yan
Catalytic oxidation of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/F) is a well-proven technique, applied in a rising number of Municipal Solid Waste Incineration plants, yet the simultaneous and possibly competitive co-oxidation of other compounds, such as chlorinated benzenes (CBz) or phenols (CP), is still poorly documented. In this study, a grinded commercial catalyst (vanadium-tungsten supported on titanium dioxide) was submitted to exploratory testing: the PCDD/F present in a gas test flow were catalytically oxidised (200°C, 10,000h(-1)), either as such or in the presence of benzene (Bz), monochlorobenzene (MCBz), and 1,2-dichlorobenzene (DCBz) and the effect of these additions on the catalytic destruction of PCDD/F was verified experimentally...
July 10, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28840569/pcdd-f-formation-during-thermal-desorption-of-chlorobenzene-contaminated-soil
#13
Zhonghua Zhao, Mingjiang Ni, Xiaodong Li, Tong Chen, Alfons Buekens, Jianhua Yan
Unintentional formation of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/F) is observed and investigated during the thermal desorption in an airflow of a sandy soil, doped artificially with either 1,2-dichlorobenzene (1,2-DiCBz) or hexachlorobenzene (HCBz) using a lab-scale experimental set-up. At all temperatures investigated (200, 250, 300, 350 and 400 °C), this thermal treatment creates significant amounts of PCDD, PCDF and polychlorinated biphenyls (PCB), starting from 1,2-DiCBz. The highest yield of PCDD/F formed from 1,2-DiCBz occurs at 250 °C, with a total (gas + residual soil) output of 117 and 166 pg/g PCDD and PCDF, respectively...
August 24, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28838040/partition-kinetics-of-chlorobenzenes-in-a-sediment-water-system
#14
Djohan Djohan, Jimmy Yu, Des Connell
The partition kinetics of chlorobenzenes (CBs) in a sediment-water system were studied to provide a basis for understanding the compounds' behaviour in the natural aquatic environment. A series of chlorobenzenes (CBs) 1,4-dichlorobenzene (DCB), 1,3,5-trichlorobenzene (TCB), 1,2,4,5-tetrachlorobenzene (TeCB), pentachlorobenzene (QCB), and hexachlorobenzene (HCB) were spiked to the sediment, and the concentrations of CBs both in sediment and water were measured at six different mixing time periods (0.17, 1, 4, 12, 24 and 48 h)...
November 2017: Chemosphere
https://www.readbyqxmd.com/read/28835693/microrna-profile-for-health-risk-assessment-environmental-exposure-to-persistent-organic-pollutants-strongly-affects-the-human-blood-microrna-machinery
#15
Julian Krauskopf, Theo M de Kok, Dennie G Hebels, Ingvar A Bergdahl, Anders Johansson, Florentin Spaeth, Hannu Kiviranta, Panu Rantakokko, Soterios A Kyrtopoulos, Jos C Kleinjans
Persistent organic pollutants (POPs) are synthetic chemical substances that accumulate in our environment. POPs such as polychlorinated biphenyls (PCBs), hexachlorobenzene (HCB) and dichlorodiphenyltrichloroethane (DDT) have been classified as carcinogenic to humans and animals. Due to their resistance to biodegradation humans are still exposed to these compounds worldwide. We aim to evaluate the miRNA and transcriptomic response of a human population exposed to POPs. The miRNA and transcriptomic response was measured in blood of healthy subjects by microarray technology and associated with the serum concentrations of six PCB congeners, DDE (a common DDT metabolite), and HCB...
August 23, 2017: Scientific Reports
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
#16
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...
November 2017: Chemosphere
https://www.readbyqxmd.com/read/28806565/implications-of-biological-factors-on-accumulation-of-persistent-organic-pollutants-in-antarctic-notothenioid-fish
#17
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
#18
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...
November 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
#19
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...
October 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
#20
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
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