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https://www.readbyqxmd.com/read/29903190/-determination-of-semi-volatile-organic-compounds-in-the-source-of-drinking-water-by-gas-chromatography-triple-quadruples-mass-spectrometry-with-auto-solid-phase-extraction
#1
Wei Wang, Xiaocong Liang, Li Tian, Rong Guo
OBJECTIVE: To establish a method for detecting 21 semi-volatile organic compounds in the source of drinking water by gas chromatography triple quadruples mass spectrometry( GC-MS/MS). METHODS: To process multiple samples at the same time, using large volume solid-phase extraction device for continuous injection. The water samples were extracted by C_(18) solid phase column, eluted with methylene chloride and ethylacetate, and then separated by DB-5MS capillary column...
July 2017: Wei Sheng Yan Jiu, Journal of Hygiene Research
https://www.readbyqxmd.com/read/29902118/polycyclic-aromatic-hydrocarbons-pahs-in-an-urban-river-at-mid-and-high-latitudes-a-case-study-in-siping-a-traditional-industrial-city-in-northeast-china
#2
Yidian Sun, Deming Dong, Liwen Zhang, Sinan He, Xiuyi Hua, Zhiyong Guo
The occurrence, spatial distribution, seasonal variation, sources, and ecological risks of polycyclic aromatic hydrocarbons (PAHs) in overlying water and surface sediments from Tiaozi River, which is an urban river running through the downtown of Siping City, a traditional industrial city of northeastern China, were investigated. The total PAH concentrations (ΣPAHs) in water varied from 473.5 to 2674.3 ng/L with a mean value of 1272.6 ng/L and ranged from 601.5 to 2906.3 ng/g with a mean value of 1534.4 ng/g in sediments...
June 14, 2018: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/29866552/transport-of-crude-oil-and-associated-microbial-populations-by-washover-events-on-coastal-headland-beaches
#3
David Curtis, Vijaikrishnah Elango, Autumn W Collins, Matthew Rodrigue, John H Pardue
Storm-driven transport of MC252 oil, sand and shell aggregates was studied on a low-relief coastal headland beach in Louisiana, USA including measurement of alkylated PAHs and Illumina sequencing of intra-aggregate microbial populations. Weathering ratios, constructed from alkylated PAH data, were used to assess loss of 3-ring phenanthrenes and dibenzothiophenes relative to 4-ring chrysenes. Specific aggregate types showed relatively little weathering of 3-ring PAHs referenced to oil sampled near the Macondo wellhead with the exception of certain SRBs sampled from the supratidal environment and samples from deposition areas north of beach...
May 2018: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/29864701/impact-of-pyrolysis-conditions-on-polycyclic-aromatic-hydrocarbons-pahs-formation-in-particulate-matter-pm-during-sewage-sludge-pyrolysis
#4
Jae Hac Ko, Jingchen Wang, Qiyong Xu
Polycyclic aromatic hydrocarbons (PAHs) not only present a risk to human health when released into the air, but also can be precursors to form particulate matter (PM) during sewage sludge pyrolysis. In this study, 16 EPA PAHs in PM (ΣPAHPM ) during sewage sludge pyrolysis were investigated with increasing temperature (200o C-1000 °C) and holding time under different operation conditions [inert gas flow rate (IGFR) (200-800 mL/min) and heating rate (5-20 °C/min)]. ΣPAHPM varied with temperature, IGFR, and heating rate, and ranged from 597 (±41) μg/g to 3240 (±868) μg/g...
May 21, 2018: Chemosphere
https://www.readbyqxmd.com/read/29846897/concentration-characteristics-source-apportionment-and-oxidative-damage-of-pm-2-5-bound-pahs-in-petrochemical-region-in-xinjiang-nw-china
#5
Yusan Turap, Dilinuer Talifu, Xinming Wang, Tuergong Aierken, Suwubinuer Rekefu, Hao Shen, Xiang Ding, Mailikezhati Maihemuti, Yalkunjan Tursun, Wei Liu
Polycyclic aromatic hydrocarbons (PAHs) are of considerable concern due to their potential as human carcinogens. Thus, determining the characteristics, potential source, and examining the oxidative capacity of PAHs to protect human health is essential. This study investigated the PM2.5 -bound PAHs at Dushanzi, a large petrochemical region in Xinjiang as well as northwest China. A total of 33 PM2.5 samples with 13 PAHs, together with molecular tracers (levoglucosan, and element carbon), were analyzed during the non-heating and heating periods...
May 30, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29787675/a-metal-stabilized-quinoidal-dibenzo-g-p-chrysene-fused-bis-dicarbacorrole-system
#6
Xian-Sheng Ke, Yongseok Hong, Vincent M Lynch, Dongho Kim, Jonathan L Sessler
We report here a metal complexation-based strategy that permits access to a highly stable expanded porphyrin-type quinoidal PAH. Specifically, double insertion of Pd(II) ions into a dibenzo[g,p]chrysene-fused bis-dicarbacorrole (bis-H3) gives rise to a bis-metalated species (bis-Pd) that undergoes a facile benzenoid-quinonoid transformation. In contrast to what is true for the corre-sponding mono-Pd(II) complex, which has organic radical character, well resolved 1H- and 19F NMR spectra are seen for bis-Pd. This complex is also electron paramagnetic resonance (EPR) silent over a range of temperatures...
May 22, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29775939/biodegradation-in-seawater-of-pah-and-alkylphenols-from-produced-water-of-a-north-sea-platform
#7
Synnøve Lofthus, Inger K Almås, Peter Evans, Oliver Pelz, Odd Gunnar Brakstad
Operational planned discharges of produced water (PW) to the marine environment from offshore oil production installations, contain low concentrations of dispersed oil compounds, like polycyclic aromatic hydrocarbons (PAHs) and alkylated phenols (APs). Biotransformation in natural seawater (SW) of naphthalenes/PAHs and phenol/APs in field-collected PW from a North Sea platform was investigated in this biodegradation study. The PW was diluted in SW from a Norwegian fjord, and the biodegradation study was performed in slowly rotating carousels at 13 °C over a period of 62 days...
May 4, 2018: Chemosphere
https://www.readbyqxmd.com/read/29770943/contamination-of-scots-pine-forests-with-polycyclic-aromatic-hydrocarbons-on-the-territory-of-industrial-city-of-siberia-russia
#8
Olga Vladimirovna Kalugina, Tatiana Alekseevna Mikhailova, Olga Vladimirovna Shergina
Anthropogenic contamination with polycyclic aromatic hydrocarbons (PAH) coming from a powerful aluminum smelter has been estimated by the accumulation of these substances (17 substances: phenanthrene, fluoranthene, pyrene, chrysene, acenaphthylene, acenaphthene, anthracene, fluorene, benz[а]anthracene, benz[b]fluoranthene, benz[k]fluoranthene, benz[а]pyrene, benz[е]pyrene, perylene, indeno[1,2,3-c,d]pyrene, benz[g,h,i]perylene, dibenz[a,h]anthracene) in needles of Scots pine (Pinus sylvestris L.) in the residential areas of Bratsk, East Siberia, Russia...
May 17, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29717431/status-sources-and-risk-assessment-of-polycyclic-aromatic-hydrocarbons-in-urban-soils-of-xi-an-china
#9
Huanyu Bao, Shaowei Hou, Hao Niu, Kai Tian, Xueping Liu, Fuyong Wu
To identify status, source of polycyclic aromatic hydrocarbons (PAHs) in urban soils and to assess soil environmental quality in Xi'an City, China, total 45 soil samples were collected from surface layer (0-10 cm) in different functional areas. Total concentrations of 16 US EPA priority PAHs ranged from 149.9 to 5770 μg kg-1 , with a mean of 1246 μg kg-1 . High molecular weight (HMW) PAHs accounted for the majority (42.4-72.2%) of the total PAHs in the urban soils, and phenanthrene (Phe), fluorene (Flo), pyrene (Pyr), benzo(b)fluoranthene (BbF), and chrysene (Chr) were the major compounds...
May 2, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29627411/occurrence-sources-and-health-risk-of-polycyclic-aromatic-hydrocarbons-in-soils-around-oil-wells-in-the-border-regions-between-oil-fields-and-suburbs
#10
Xiao-Wen Fu, Tian-Yuan Li, Lei Ji, Lei-Lei Wang, Li-Wen Zheng, Jia-Ning Wang, Qiang Zhang
The Yellow River Delta (YRD) is a typical region where oil fields generally overlap cities and towns, leading to complex soil contamination from both the oil fields and human activities. To clarify the distribution, speciation, potential sources and health risk of polycyclic aromatic hydrocarbons (PAHs) in soils of border regions between oil fields and suburbs of the YRD, 138 soil samples (0-20 cm) were collected among 12 sampling sites located around oil wells with different extraction histories. The 16 priority control PAHs (16PAHs), as selected by the United States Environmental Protection Agency (USEPA), were extracted via an accelerated solvent extraction and detected by GC-MS...
August 15, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29620877/a-family-of-rhodium-complexes-with-selective-toxicity-toward-mismatch-repair-deficient-cancers
#11
Kelsey M Boyle, Jacqueline K Barton
Rhodium metalloinsertors are a unique set of metal complexes that bind specifically to DNA base pair mismatches in vitro and kill mismatch repair (MMR)-deficient cells at lower concentrations than their MMR-proficient counterparts. A family of metalloinsertors containing rhodium-oxygen ligand coordination, termed "Rh-O" metalloinsertors, has been prepared and shown to have a significant increase in both overall potency and selectivity toward MMR-deficient cells regardless of structural changes in the ancillary ligands...
April 25, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29576975/half-lives-of-pahs-and-temporal-microbiota-changes-in-commonly-used-urban-landscaping-materials
#12
Marja I Roslund, Mira Grönroos, Anna-Lea Rantalainen, Ari Jumpponen, Martin Romantschuk, Anirudra Parajuli, Heikki Hyöty, Olli Laitinen, Aki Sinkkonen
Background: Polycyclic aromatic hydrocarbons (PAHs) accumulate in urban soils, and PAH contamination can change soil microbial community composition. Environmental microbiota is associated with human commensal microbiota, immune system and health. Therefore, studies investigating the degradation of PAHs, and the consequences of soil pollution on microbial communities in urban landscaping materials, are crucial. Methods: Four landscaping materials (organic matter 1, 2, 13 and 56%) were contaminated with PAHs commonly found at urban sites (phenanthrene, fluoranthene, pyrene, chrysene and benzo(b)fluoranthene) in PAH concentrations that reflect urban soils in Finland (2...
2018: PeerJ
https://www.readbyqxmd.com/read/29574375/characterization-and-health-risk-assessment-of-airborne-pollutants-in-commercial-restaurants-in-northwestern-china-under-a-low-ventilation-condition-in-wintertime
#13
Wenting Dai, Haobin Zhong, Lijuan Li, Junji Cao, Yu Huang, Minxia Shen, Liqin Wang, Jungang Dong, Xuexi Tie, Steven Sai Hang Ho, Kin Fai Ho
Impacts on indoor air quality of dining areas from cooking activities were investigated in eight categories of commercial restaurants including Szechwan Hotpot, Hunan, Shaanxi Noodle, Chinese Barbecue, Chinese Vegetarian, Korean Barbecue, Italian, and Indian, in Northwestern China during December 2011 to January 2012. Chemical characterization and health risk assessment for airborne carbonyls, and particulate-bound polycyclic aromatic hydrocarbons (PAHs) and heavy metals were conducted under low ventilation conditions in wintertime...
August 15, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29560728/synthesis-and-structure-of-a-propeller-shaped-polycyclic-aromatic-hydrocarbon-containing-seven-membered-rings
#14
Kazuya Kawai, Kenta Kato, Lingqing Peng, Yasutomo Segawa, Lawrence T Scott, Kenichiro Itami
The synthesis and structure of a C3 -symmetric propeller-shaped polycyclic aromatic hydrocarbon that bears three seven-membered rings is reported. The synthesis was accomplished in three steps from benzo[ c]naphtho[2,1- p]chrysene, including a Pd-catalyzed intramolecular C-H arylation for the formation of the seven-membered rings. The combination of the helicities ( P/ M) of the three seven-membered-ring moieties and three [4]helicene moieties affords 24 possible conformers, and two relatively stable conformations were observed by 1 H NMR spectroscopy...
April 6, 2018: Organic Letters
https://www.readbyqxmd.com/read/29550936/estimating-the-bioconcentration-factors-of-hydrophobic-organic-compounds-from-biotransformation-rates-using-rainbow-trout-hepatocytes
#15
Jennifer J Trowell, Frank A P C Gobas, Margo M Moore, Christopher J Kennedy
Determining the biotransformation potential of commercial chemicals is critical for estimating their persistence in the aquatic environment. In vitro systems are becoming increasingly important as screening methods for assessing the potential for chemical metabolism. Depletion rate constants (kd ) for several organic chemicals with high octanol-water partition coefficient (Kow ) values (9-methylanthracene, benzo(a)pyrene, chrysene, and PCB-153) in rainbow trout hepatocytes were determined to estimate biotransformation rate constants (kMET ) that were used in fish bioconcentration factor (BCF) models...
March 17, 2018: Archives of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/29542919/directed-ortho-metalation-and-anionic-ortho-fries-rearrangement-of-polycyclic-aromatic-o-carbamates-regioselective-synthesis-of-substituted-chrysenes
#16
Sindhu Kancherla, Marianne Lorentzen, Victor Snieckus, Kåre B Jørgensen
A general method for the regioselective synthesis of a series of ortho-substituted chrysenyl N, N-diethyl- O-carbamates by the directed ortho-metalation (D oM) strategy is reported. The starting O-carbamates were prepared from the corresponding chrysenols, available by oxidative photochemical cyclization or directed remote metalation tactics. Chrysen-1-yl and chrysene-3-yl ring site selectivity of directed ortho-metalation (D oM) and anionic ortho-Fries rearrangement (A oF) protocols, with s-BuLi/TMEDA, followed by electrophilic quench using a selection of electrophiles, were observed, leading to new chrysenyl derivatives...
April 6, 2018: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/29533714/assessment-of-contamination-source-and-quality-control-approach-for-polycyclic-aromatic-hydrocarbons-in-wood-pressed-rapeseed-oil
#17
Ruijie Liu, Youfeng Zhang, Jun Wang, Qiqi Pan, Yingqi Luo, Yujie Sun, Qingzhe Jin, Xingguo Wang
Contamination sources of polycyclic aromatic hydrocarbons (PAHs) in the raw material, oil production and storage processes of wood-pressed rapeseed oil were investigated in this study. The results showed that benzo[a]pyrene (BaP) and PAH4 (sum of BaP, benzo[a]fluoranthene, benzo[b]fluoranthene and chrysene) were unevenly distributed in the kernel (0.56-0.98 and 2.84-8.64 μg/kg, respectively) and hull (1.53-3.17 and 13.49-22.31 μg/kg, respectively) of the rapeseed raw materials. The contents of BaP and PAH4 continuously increased during the process of wood-pressed rapeseed oil, ranging from 2...
March 14, 2018: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
https://www.readbyqxmd.com/read/29521567/evaluation-of-the-impact-of-anthropogenic-activities-on-arsenic-cadmium-chromium-mercury-lead-and-polycyclic-aromatic-hydrocarbon-levels-in-seafood-from-the-gulf-of-naples-italy
#18
E Fasano, A Arnese, F Esposito, L Albano, A Masucci, C Capelli, T Cirillo, A Nardone
The principal aim of this study was to monitor the occurrence of some metals and polycyclic aromatic hydrocarbons (PAHs) in fish and mussels from the Gulf of Naples. A comparison with previous researches of the same area was carried out, and the intakes of these compounds through the diet and their effect on the tolerable intake values (when available) were assessed. Cadmium (Cd), chromium (Cr), and lead (Pb) were detected by flameless atomic absorption spectroscopy (Cd, Cr, and Pb); arsenic (As) and mercury (Hg) were detected by applying the hydride method...
March 9, 2018: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/29504004/polyaromatic-molecular-tubes-from-strategic-synthesis-to-host-functions
#19
Kohei Yazaki, Lorenzo Catti, Michito Yoshizawa
Ring- and tube-shaped molecules like crown ethers and cyclodextrins play a fundamental role in supramolecular chemistry since their initial discovery. To date, numerous intriguing properties and reactivities have been reported based on their unique inner microenvironments. While inner spaces encircled by aliphatic and/or small aromatic frameworks have been heavily investigated, tubular structures that feature polyaromatic frameworks remained largely unexplored until 2010, despite their undisputable potential...
March 27, 2018: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29490609/comparative-oesophageal-cancer-risk-assessment-of-hot-beverage-consumption-coffee-mate-and-tea-the-margin-of-exposure-of-pah-vs-very-hot-temperatures
#20
Alex O Okaru, Anke Rullmann, Adriana Farah, Elvira Gonzalez de Mejia, Mariana C Stern, Dirk W Lachenmeier
BACKGROUND: Consumption of very hot (> 65 °C) beverages is probably associated with increased risk of oesophageal cancer. First associations were reported for yerba mate and it was initially believed that high content of polycyclic aromatic hydrocarbons (PAH) might explain the risk. Later research on other beverage groups such as tea and coffee, which are also consumed very hot, found associations with increased risk of oesophageal cancer as well. The risk may therefore not be inherent in any compound contained in mate, but due to temperature...
March 1, 2018: BMC Cancer
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