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https://www.readbyqxmd.com/read/28211323/evaluation-the-urban-atmospheric-conditions-in-different-cities-using-comet-and-micronuclei-assay-in-tradescantia-pallida
#1
Juliana Caroline Vivian Sposito, Bruno do Amaral Crispim, Amanda Izadora Romãn, Rosilda Mara Mussury, Joelson Gonçalves Pereira, Leonardo Oliveira Seno, Alexeia Barufatti Grisolia
In the present study, genotoxicity and mutagenicity were investigated in Tradescantia pallida exposed to vehicular traffic at different sites in a high-altitude tropical climate. During March, May, July, September, and November 2014, a comet assay and micronucleus bioassays were conducted on young inflorescences and leaves of T. pallida collected from twelve towns in the southern region of Mato Grosso do Sul with different amounts of vehicular traffic. Weather parameters (temperature, relative humidity and rainfall) were measured and vehicles were counted to determine traffic levels in each town...
February 1, 2017: Chemosphere
https://www.readbyqxmd.com/read/28207853/numerical-simulations-of-atmospheric-dispersion-of-iodine-131-by-different-models
#2
Ádám Leelőssy, Róbert Mészáros, Attila Kovács, István Lagzi, Tibor Kovács
Nowadays, several dispersion models are available to simulate the transport processes of air pollutants and toxic substances including radionuclides in the atmosphere. Reliability of atmospheric transport models has been demonstrated in several recent cases from local to global scale; however, very few actual emission data are available to evaluate model results in real-life cases. In this study, the atmospheric dispersion of 131I emitted to the atmosphere during an industrial process was simulated with different models, namely the WRF-Chem Eulerian online coupled model and the HYSPLIT and the RAPTOR Lagrangian models...
2017: PloS One
https://www.readbyqxmd.com/read/28202280/pollutant-content-in-marine-debris-and-characterization-by-thermal-decomposition
#3
M E Iñiguez, J A Conesa, A Fullana
Marine debris (MDs) produces a wide variety of negative environmental, economic, safety, health and cultural impacts. Most marine litter has a very low decomposition rate (plastics), leading to a gradual accumulation in the coastal and marine environment. Characterization of the MDs has been done in terms of their pollutant content: PAHs, ClBzs, ClPhs, BrPhs, PCDD/Fs and PCBs. The results show that MDs is not a very contaminated waste. Also, thermal decomposition of MDs materials has been studied in a thermobalance at different atmospheres and heating rates...
February 12, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28199945/contribution-of-methane-sulfonic-acid-to-new-particle-formation-in-the-atmosphere
#4
Hailiang Zhao, Xiaotong Jiang, Lin Du
Methane sulfonic acid (MSA) is present in substantial concentrations in the gas phase over oceans and coastal regions. We present an investigation into the contribution of MSA to new particle formation with the common atmospheric aerosol nucleation precursors including MSA, methanol, formic acid, acetone, dimethylether, formaldehyde, methyl formate, by making use a quantum chemical approach. Density functional theory calculations indicate that these bimolecular complexes are characterized by the presence of strong inter-molecular hydrogen bonds (SOH⋯O) with large binding energies and thermodynamic equilibrium constants...
February 7, 2017: Chemosphere
https://www.readbyqxmd.com/read/28197944/wet-nitrogen-and-phosphorus-deposition-in-the-eutrophication-of-the-lagos-lagoon-nigeria
#5
Najeem O Oladosu, Akeem A Abayomi, Kehinde O Olayinka, Babajide I Alo
Air pollution is influenced by wind-aided particulate suspension, open-air waste burning, and fossil fuel combustion. The pollutants from these sources eventually deposit on ambient surfaces. Atmospheric wet deposition into Lagos Lagoon may be significant additions to the nutrient levels of the eutrophic lagoon. Precipitation was monitored at three stations in the Lagos Lagoon basin from May to November, 2012, in order to estimate the contribution of wet deposition to the nutrient cycles of the lagoon. Water samples were digested with potassium persulfate, and the species of phosphorus (P) and nitrogen (N) were analyzed by colorimetric methods...
February 15, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28194674/biomonitoring-of-atmospheric-pollution-a-novel-approach-for-the-evaluation-of-natural-and-anthropogenic-contribution-to-atmospheric-aerosol-particles
#6
Rosa Caggiano, Giuseppe Calamita, Serena Sabia, Serena Trippetta
The investigation of the potential natural and anthropogenic contribution to atmospheric aerosol particles by using lichen-bag technique was performed in the Agri Valley (Basilicata region, southern Italy). This is an area of international concern since it houses one of the largest European on-shore reservoirs and the biggest oil/gas pre-treatment plant (i.e., Centro Olio Val d'Agri (COVA)) within an anthropized context. In particular, the concentrations of 17 trace elements (Al, Ca, Cd, Cr, Cu, Fe, K, Li, Mg, Mn, Na, Ni, P, Pb, S, Ti, and Zn) were measured in lichen bags exposed in 59 selected monitoring points over periods of 6 months (from October 2011 to April 2012) and 12 months (from October 2011 to October 2012)...
February 13, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28193064/vapor-pressure-isotope-effects-in-halogenated-organic-compounds-and-alcohols-dissolved-in-water
#7
Axel Horst, Georges Lacrampe-Couloume, Barbara Sherwood Lollar
Volatilization causes changes in the isotopic composition of organic compounds as a result of different vapor pressures of molecules containing heavy and light isotopes. Both normal and inverse vapor pressure isotope effects (VPIE) have been observed, depending on molecular interactions in the liquid phase and the investigated element. Previous studies have focused mostly on pure compound volatilization or on compounds dissolved in organic liquids. Environmentally relevant scenarios, such as isotope fractionation during volatilization of organics from open water surfaces, have largely been neglected...
December 20, 2016: Analytical Chemistry
https://www.readbyqxmd.com/read/28190686/role-of-snow-in-the-fate-of-gaseous-and-particulate-exhaust-pollutants-from-gasoline-powered-vehicles
#8
Yevgen Nazarenko, Sébastien Fournier, Uday Kurien, Rodrigo Benjamin Rangel-Alvarado, Oleg Nepotchatykh, Patrice Seers, Parisa A Ariya
Little is known about pollution in urban snow and how aerosol and gaseous air pollutants interact with the urban snowpack. Here we investigate interactions of exhaust pollution with snow at low ambient temperature using fresh snow in a temperature-controlled chamber. A gasoline-powered engine from a modern light duty vehicle generated the exhaust and was operated in homogeneous and stratified engine regimes. We determined that, within a timescale of 30 min, snow takes up from the exhaust a large mass of organic pollutants and aerosol particles, which were observed by electron microscopy, mass spectrometry and aerosol sizers...
February 9, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28189028/assessment-of-heavy-metal-pollution-spatial-distribution-and-origin-in-agricultural-soils-along-the-sin%C3%A3%C2%BA-river-basin-colombia
#9
José Marrugo-Negrete, José Pinedo-Hernández, Sergi Díez
The presence of metals in agricultural soils from anthropogenic activities such as mining and agricultural use of metals and metal-containing compounds is a potential threat for human health through the food chain. In this study, the concentration of heavy metals in 83 agricultural soils irrigated by the Sinú River, in northern Colombia, affected by mining areas upstream and inundated during seasonal floods events were determined to evaluate their sources and levels of pollution. The average concentrations of Cu, Ni, Pb, Cd, Hg and Zn were 1149, 661, 0...
February 7, 2017: Environmental Research
https://www.readbyqxmd.com/read/28187389/atmospheric-wet-deposition-of-dissolved-trace-elements-to-jiaozhou-bay-north-china-fluxes-sources-and-potential-effects-on-aquatic-environments
#10
Jianwei Xing, Jinming Song, Huamao Yuan, Qidong Wang, Xuegang Li, Ning Li, Liqin Duan, Baoxiao Qu
To analyze the fluxes, seasonal variations, sources and potential ecological effects of dissolved trace elements (TEs) in atmospheric wet deposition (AWD), one-year wet precipitation samples were collected and determined for nine TEs in Jiaozhou Bay (JZB) between June 2015 and May 2016. Both the volume-weighted mean (VWM) concentration and flux sequence for the measured TEs was Al > Mn > Zn > Fe > Pb > Se > Cr > Cd > Co. Al was the most abundant TE with a VWM concentration and wet flux of 33...
February 2, 2017: Chemosphere
https://www.readbyqxmd.com/read/28185707/spatial-variation-of-atmospheric-nitrogen-deposition-and-critical-loads-for-aquatic-ecosystems-in-the-greater-yellowstone-area
#11
L Nanus, J A McMurray, D W Clow, J E Saros, T Blett, J J Gurdak
Current and historic atmospheric nitrogen (N) deposition has impacted aquatic ecosystems in the Greater Yellowstone Area (GYA). Understanding the spatial variation in total atmospheric deposition (wet + dry) of N is needed to estimate air pollution deposition critical loads for sensitive aquatic ecosystems. This is particularly important for areas that have an increasing contribution of ammonia dry deposition to total N (TN), such as the GYA. High resolution geostatistical models and maps of TN deposition (wet + dry) were developed using a variety of techniques including ordinary kriging in a geographic information system, to evaluate spatial variability and identify areas of elevated loading of pollutants for the GYA...
February 6, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28169528/the-essential-role-for-laboratory-studies-in-atmospheric-chemistry
#12
James B Burkholder, Jonathan P D Abbatt, Ian Barnes, James M Roberts, Megan L Melamed, Markus Ammann, Allan K Bertram, Christopher David Cappa, Ann Marie Grover Carlton, Lucy J Carpenter, John Nicholas Crowley, Yael Dubowski, Christian George, Dwayne E Heard, Hartmut Herrmann, Frank N Keutsch, Jesse H Kroll, V Faye McNeill, Nga Lee Ng, Sergey A Nizkorodov, John J Orlando, Carl John Percival, Bénédicte Picquet-Varrault, Yinon Rudich, Paul W Seakins, Jason Douglas Surratt, Hiroshi Tanimoto, Joel A Thornton, Tong Zhu, Geoffrey S Tyndall, Andreas Wahner, Charles J Weschler, Kevin R Wilson, Paul Jeffrey Ziemann
Laboratory studies of atmospheric chemistry characterize the nature of atmospherically relevant processes down to the molecular level, providing fundamental information used to assess how human activities drive environmental phenomena such as climate change, urban air pollution, ecosystem health, indoor air quality, and stratospheric ozone depletion. Laboratory studies have a central role in addressing the incomplete fundamental knowledge of atmospheric chemistry. This article highlights the evolving science needs for this community and emphasizes how our knowledge is far from complete, hindering our ability to predict the future state of our atmosphere and to respond to emerging global environmental change issues...
February 7, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28169367/development-of-a-novel-simulation-reactor-for-chronic-exposure-to-atmospheric-particulate-matter
#13
Jianhuai Ye, Sepehr Salehi, Michelle L North, Anjelica M Portelli, Chung-Wai Chow, Arthur W H Chan
Epidemiological studies have shown that air pollution is associated with the morbidity and mortality from cardiopulmonary diseases. Currently, limited experimental models are available to evaluate the physiological and cellular pathways activated by chronic multi-pollutant exposures. This manuscript describes an atmospheric simulation reactor (ASR) that was developed to investigate the health effects of air pollutants by permitting controlled chronic in vivo exposure of mice to combined particulate and gaseous pollutants...
February 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28169221/gaussian-plume-atmospheric-modelling-and-radiation-exposure-calculations-following-the-cremation-of-a-deceased-thyroid-cancer-patient-treated-with-iodine-131
#14
Phillipe J Calais
Shortly after treatment with 7200 MBq of (131)I, a thyroid cancer patient died and was subsequently cremated. Calculations of the atmospheric emissions of (131)I from the crematorium flue were performed using a standard atmospheric pollution Gaussian Plume Dispersal model. Estimates of whole-body and thyroid dose of those potentially exposed were made using OLINDA/EXM dosimetry software. Under the meteorological conditions prevalent at the time of the cremation, and depending on the actual release rate of the (131)I, the Western Australian legal limit of 3...
February 7, 2017: Journal of Radiological Protection: Official Journal of the Society for Radiological Protection
https://www.readbyqxmd.com/read/28165927/is-3d-printing-safe-analysis-of-the-thermal-treatment-of-thermoplastics-abs-pla-pet-and-nylon
#15
Szymon Wojtyła, Piotr Klama, Tomasz Baran
The fast development of low-cost desktop three-dimensional (3D) printers has made those devices widely accessible for goods manufacturing at home. However, is it safe? Users may belittle the effects or influences of pollutants (organic compounds and ultrafine particles) generated by the devices in question. Within the scope of this study, the authors attempt to investigate thermal decomposition of the following commonly used, commercially available thermoplastic filaments: acrylonitrile-butadiene-styrene (ABS), polylactic acid (PLA), polyethylene terephthalate (PET), and nylon...
February 6, 2017: Journal of Occupational and Environmental Hygiene
https://www.readbyqxmd.com/read/28161519/pathways-of-heavy-metals-contamination-and-associated-human-health-risk-in-ajay-river-basin-india
#16
Umesh Kumar Singh, Balwant Kumar
The sources of heavy metals and their loads in the Ajay River were investigated based on the seasonal and spatial variations. To identify variation and pathways of heavy metals, seventy-six water samples were estimated for 2 years at nineteen sampling sites. The multifaceted data were applied to evaluate statistical relation between variables and arithmetic calculation of the indices. Fickling plot suggested that the acidic pollutants do not affect the water quality because all samples lie within the neutral pH range...
January 26, 2017: Chemosphere
https://www.readbyqxmd.com/read/28161268/source-apportionment-and-a-novel-approach-of-estimating-regional-contributions-to-ambient-pm2-5-in-haikou-china
#17
Baoshuang Liu, Tingkun Li, Jiamei Yang, Jianhui Wu, Jiao Wang, Jixin Gao, Xiaohui Bi, Yinchang Feng, Yufen Zhang, Haihang Yang
A novel approach was developed to estimate regional contributions to ambient PM2.5 in Haikou, China. In this paper, the investigation was divided into two main steps. The first step: analysing the characteristics of the chemical compositions of ambient PM2.5, as well as the source profiles, and then conducting source apportionments by using the CMB and CMB-Iteration models. The second step: the development of estimation approaches for regional contributions in terms of local features of Haikou and the results of source apportionment, and estimating regional contributions to ambient PM2...
February 1, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28160538/fine-and-ultrafine-aerosol-in-ostrava-ambient-air
#18
Karel Lach, Karel Klouda, Vladimír Mička, Lucie Hellebrandová
Air quality in the Moravian-Silesian Region and especially in the Ostrava agglomeration represents a very important factor influencing the environment and health of the local population. The area has been burdend for more than two centuries with rapid development of the mining industry and related metallurgical and chemical production. As a result, hundreds of tons of pollutants have progressively been released into the atmosphere. Some of them have been gradually eliminated from the environment; others, such as some heavy metals, remain locally present and burden the local landscape...
December 2016: Central European Journal of Public Health
https://www.readbyqxmd.com/read/28159305/microscopic-characterisation-of-black-crusts-on-different-substrates
#19
J S Pozo-Antonio, M F C Pereira, C S A Rocha
Black crusts on different substrates (carbonate and silicate stones, cement-based mortar and carbonate detrital deposits) in urban environments were characterized microscopically by analysing their morphologies and compositions. The objective of this article is to study the interaction between the substrate and the crust and the influence of the environmental conditions on the crust development. On the one hand, the internal structure and morphology of each sample were evaluated with stereo and scanning electron microscopies...
February 1, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28153416/evaluating-the-effectiveness-of-pollution-control-measures-via-the-occurrence-of-ddts-and-hchs-in-wet-deposition-of-an-urban-center-china
#20
Ling-Chuan Guo, Lian-Jun Bao, Shao-Meng Li, Shu Tao, Eddy Y Zeng
Wet deposition is not only a mechanism for removing atmospheric pollutants, but also a process which reflects loadings of atmospheric pollutants. Our previous study on wet deposition examined the effectiveness of short-term control measures on atmospheric particulate pollution, which were partly effective for organic pollutants of current input sources. In the present study, dichlorodiphenyltrichloroethanes (DDTs) and hexachlorocyclohexanes (HCHs), representative of legacy contaminants, were measured in the same samples collected throughout the entire year of 2010 in Guangzhou, a large urban center in South China...
January 30, 2017: Environmental Pollution
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