Добірка наукової літератури з теми "Isotopes du mercure"
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Статті в журналах з теми "Isotopes du mercure":
Li, Zhong Gen, Xin Bin Feng, Guang Hui Li, Run Sheng Yin, and Ben Yu. "Mass Balance and Isotope Characteristics of Mercury in Two Coal-Fired Power Plants in Guizhou, China." Advanced Materials Research 518-523 (May 2012): 2576–79. http://dx.doi.org/10.4028/www.scientific.net/amr.518-523.2576.
Irei, Satoshi. "Isotopic Characterization of Gaseous Mercury and Particulate Water-Soluble Organic Carbon Emitted from Open Grass Field Burning in Aso, Japan." Applied Sciences 12, no. 1 (December 23, 2021): 109. http://dx.doi.org/10.3390/app12010109.
Adorni-Braccesi, A., M. Acutis, S. Merlo, and G. M. Zuppi. "Application des techniques physiques, géochimiques et isotopiques pour l'évaluation de l'infiltration sous climat tempéré." Revue des sciences de l'eau 14, no. 3 (April 12, 2005): 243–63. http://dx.doi.org/10.7202/705419ar.
Zhang, Wenfeng, Weixiong Huang, Xiao Chen, Xingfen Yang, and Xiaoguang Yang. "Stable carbon and nitrogen isotope evidence for the low biomagnification of mercury in marine fish from the South China Sea." Marine and Freshwater Research 71, no. 8 (2020): 1017. http://dx.doi.org/10.1071/mf19069.
Lepak, Ryan F., Joel C. Hoffman, Sarah E. Janssen, David P. Krabbenhoft, Jacob M. Ogorek, John F. DeWild, Michael T. Tate, et al. "Mercury source changes and food web shifts alter contamination signatures of predatory fish from Lake Michigan." Proceedings of the National Academy of Sciences 116, no. 47 (November 4, 2019): 23600–23608. http://dx.doi.org/10.1073/pnas.1907484116.
Irei, Satoshi. "Development of Fast Sampling and High Recovery Extraction Method for Stable Isotope Measurement of Gaseous Mercury." Applied Sciences 10, no. 19 (September 24, 2020): 6691. http://dx.doi.org/10.3390/app10196691.
Blum, Joel D., Jeffrey C. Drazen, Marcus W. Johnson, Brian N. Popp, Laura C. Motta, and Alan J. Jamieson. "Mercury isotopes identify near-surface marine mercury in deep-sea trench biota." Proceedings of the National Academy of Sciences 117, no. 47 (November 16, 2020): 29292–98. http://dx.doi.org/10.1073/pnas.2012773117.
Huang, Qiang, Jiubin Chen, Weilin Huang, Pingqing Fu, Benjamin Guinot, Xinbin Feng, Lihai Shang, et al. "Isotopic composition for source identification of mercury in atmospheric fine particles." Atmospheric Chemistry and Physics 16, no. 18 (September 22, 2016): 11773–86. http://dx.doi.org/10.5194/acp-16-11773-2016.
Jiskra, Martin, Jeroen E. Sonke, Yannick Agnan, Detlev Helmig, and Daniel Obrist. "Insights from mercury stable isotopes on terrestrial–atmosphere exchange of Hg(0) in the Arctic tundra." Biogeosciences 16, no. 20 (October 18, 2019): 4051–64. http://dx.doi.org/10.5194/bg-16-4051-2019.
Paranjape, Avnee R., and Britt D. Hall. "Recent advances in the study of mercury methylation in aquatic systems." FACETS 2, no. 1 (May 1, 2017): 85–119. http://dx.doi.org/10.1139/facets-2016-0027.
Дисертації з теми "Isotopes du mercure":
Hannachi, Fazia. "Étude des isotopes de mercure de la région de transition A ~ 186." Paris 11, 1987. http://www.theses.fr/1987PA112475.
High-spin states in ¹⁸⁵⁻¹⁸⁷⁻¹⁸⁸Hg have been investigated via the ¹⁶¹-¹⁶⁴Dy (²⁸Si, xn) reactions by in-beam γ-ray spectroscopic techniques using the “Chateau de Cristal” 4π-multidetector array. Level schemes have been established. Spins and parities of the states have been deduced from transitions multipolarities obtained from measurements of the angular distribution and linear polarization of the γ-rays. The shape coexistence of both prolate and oblate band structures built on states originating from νil3/2 subshell, has been observed for the first time in ¹⁸⁵⁻¹⁸⁷Hg as well as the rotational bands built on the 1/2⁻[521] and 7/2⁻[514] states in ¹⁸⁵Hg. In ¹⁸⁸Hg negative-parity bands are well developed. The various band structures are interpreted within the framework of the cranked shell model. The oblate structures are well reproduced by considering νil3/2 excitations while it is more difficult to conclude about the nature of the particle involved in the prolate ones
Enrico, Maxime. "Atmospheric mercury deposition and mercury stable isotope compositions in peat bogs." Thesis, Toulouse, INPT, 2015. http://www.theses.fr/2015INPT0103/document.
During the past few decades, peatlands were successfully used to investigate historical mercury (Hg) deposition. The chronology of Hg accumulation rates (HgARs) to peatlands is well constrained, with recent increases in HgAR associated with anthropogenic Hg emissions and deposition. The use of Hg stable isotopes in peatland ecosystems provides new opportunities to better characterize and understand historical Hg deposition. In an extensive study conducted at the Pinet peat bog (French Pyrenees) we identify gaseous elemental Hg (GEM) dry deposition, via foliar uptake, as the dominant Hg transfer pathway from the atmosphere to peat vegetation. Based on the Hg isotope analysis of multiple northern hemispheric peat records, we find that GEM dry deposition dominates Hg deposition globally. We suggest that peatlands can be used as archives of both past Hg wet deposition, Hg dry deposition and GEM concentration. We present the first quantitative reconstruction of historical atmospheric GEM concentrations using peat archives from the Pyrenees. The Human impact on Hg cycling caused a gradual increase in GEM concentrations from 0.2 (10,000 – 4000 BP) to 3.5 ng m-3 (20th Century) and was accompanied by a change in atmospheric Hg isotope signatures. This first comprehensive study on Hg isotope deposition to peatlands is promising and should be extended to pre-anthropogenic times to investigate natural variations in atmospheric Hg dynamics during the Holocene
Feng, Caiyan. "Spéciation et composition isotopique du mercure pour étudier les voies de contamination bio-environnementale du mercure." Thesis, Pau, 2015. http://www.theses.fr/2015PAUU3018/document.
Mercury (Hg) is a global pollutant and its ecotoxicological effects are strongly dependent on its chemical form mainly as methylmercury (MeHg). Due to the high bioaccumulation and biomagnification of MeHg in food webs, human exposure occurs through the consumption of fish, but also rice nearby Hg mining area (China). Hg isotopes composition is a potentials powerful tool and has been recently used to trace Hg contamination and biogeochemical processes in environment and living organisms. In this work, Hg speciation and isotopic composition of bio-environmental samples has been investigated in order to elucidate Hg contamination pathways between contaminated sites and target living organisms such as soil-rice plant system in a Hg mining region and aquatic biota in a river impacted by a chlor-alkali plant. An ecotoxicological study has also demonstrated how Hg isotopic composition in different fish organs allows to better understand Hg metabolic pathways and induced toxicological response
Hannachi, Fazia. "Etude des isotopes de mercure de la région de transition ...186." Grenoble 2 : ANRT, 1987. http://catalogue.bnf.fr/ark:/12148/cb376058223.
Nigron, Etienne. "Isotopes radioactifs produits par voies non conventionnelles." Thesis, Nantes, 2019. http://www.theses.fr/2019NANT4032.
Nuclear medicine uses radionuclides for diagnosis and therapy. Nowadays, the nuclear medicine tends to adapt more efficiently to each patient. To achieve this goal, a wide range of radionuclides must be available for the physician's requirements. A theranostic approach (therapy and diagnosis) can be implemented from drug's design in order to guide medicine towards a personalised medicine. ln this sense, studies on the production of innovative radionuclides using unconventional pathways (deuteron beams, non-standard target materials: enriched targets or fission products) were conducted during this thesis. Reaction pathways¹⁹⁷ Au(d,2n) ¹⁹⁷ᵐHg and ⁷⁰Zn(d,x)⁶⁷ Cu were identified as relevant and their cross section were measured. The production parameters limiting the production of contaminants were proposed and yields were calculated for the highlighted reactions. For the measurements of these cross sections, a new experimental device has been designed to directly measure the particle flow. An intensive study on the optimal operational conditions was performed by defining an uncertainty of measurements of 2%. This device allows obtaining cross-section values with diminished uncertainties in comparison with the commonly used method of monitor reactions which have uncertainties of the order of 10%. The possibility of recovering light fission products from spent nuclear fuel was also explored. These fission products can be considered as a target to produce radionuclides of medical interest. Some nuclei, which can be created from these fission products, have been identified and their production pathways, based on their cross sections, have been studied in detail. The yield curves were calculated for the reaction paths were recognised as potentially interesting/feasible for this mean
Sun, Ruoyu. "Les variations isotopiques du mercure dans le charbon et les produits de combustion du charbon : une évaluation de la traçabilité des émissions du mercure des centrales au charbon." Toulouse 3, 2013. http://thesesups.ups-tlse.fr/2055/.
Mercury (Hg) is a toxic, persistent and globally distributed pollutant. Since the industrial revolution, human activities have augmented the global Hg cycle at the Earth's surface by a factor of three. Hg emissions from coal-fired power plants represent at present the largest single anthropogenic source. However, quantitative tracing of the fate of coal Hg emissions from different countries or regions is a challenging issue. The objective of this PhD dissertation was to use Hg stable isotope signatures to address this problem. Firstly, we developed a combustion-trapping protocol to extract, purify and pre-concentrate Hg from solid samples with low Hg levels such as coal and coal combustion products. Purified coal Hg was then measured for its isotope compositions by high-precision (~0. 1‰, 2s) multi-collector inductively coupled plasma mass spectrometry. In summary we find that coals from different global coal basins are often isotopically distinguishable at the p=0. 05 or 0. 10 level, and that combustion and capture processes in coal-fired power plants do not substantially change feed coal Hg isotope signatures. We consider these combined results to be sufficiently promising to recommend detailed atmospheric Hg isotope tracer studies of coal plant Hg emissions. However, we anticipate that the different gaseous and particulate forms of Hg in coal flue gas emissions may carry more contrasting Hg isotope signatures than we estimated for bulk emissions. Therefore, caution should be taken in near-field and far-field coal Hg emission tracing, and additional studies on the Hg isotope signatures of coal plant Hg emissions are necessary
Barre, Julien. "Evaluation de la contamination atmosphérique des écosystèmes en utilisant la composition isotopique du plomb et du mercure dans les lichens." Thesis, Pau, 2013. http://www.theses.fr/2013PAUU3049/document.
The isotopic signature of lead (Pb) and mercury (Hg) was measured in epiphytic lichens from Pyrénées-Atlantiques. An integrated and spatialized sampling was developed using geographical information system (GIS) to take into account the diversity of the territory (land-use, forest, agriculture, industries and urban areas). At meso-scale (county, Pyrenees-Atlantiques) the isotopic composition allows to differenciate areas impacted by anthropegenic activities and discriminate the origin of the contamination that it of industrial or urban type. At local scale, the isotopic signature of Hg and Pb in lichens and mosses sampled in Iraty forest (Franco-Spanish border) allowed to evaluate the kind of atmospheric deposits in these atmospheric bio-monitors and the potential of this new tool for the monitoring of atmospheric depositsin remote ecosystems. Finally, on the mercurifere area of Almadén (Castella la Mancha, Spain) the isotopic fingerprint of Hg in lichens and sediments appears to be a relevant tool to study the transfer of Hg from mining activities to hydrosystems and atmosphere
Monperrus, Mathilde. "Utilisation de traceurs isotopiques stables pour la spéciation du mercure et des buthylétains : Application à l'étude de la biométhylation du mercure dans les environnements aquatiques." Pau, 2004. http://www.theses.fr/2004PAUU3031.
The first part of this work involves the development of new analytical methods for the speciation analysis of mercury and butyltin compounds in environmental matrices. The optimization of these new methods for speciation analysis is based on the isotope dilution technique and has been developed specially for the simultaneous determination of mercury and butyltin compounds taking into account the simultaneous sample preparation and the simultaneous detection. The analytical development has been carried out for the different environmental matrix found in the aquatic ecosystems: water samples, biological tissues and sediments. In the second part of this work, the developed analytical techniques have been used to investigate biogeochemical cycles of mercury and butyltin into aquatic environments. Experimental methods, using isotopically enriched species as tracers, have been developed and have allowed the evaluation of mercury transformation mechanisms (methylation/demethylation) in the different compartments of the aquatics systems (in the sediments and the water column). Environmental factors and biological parameters have been also investigated in order to determine the possible link between the mercury transformation processes and the biological activities (bacterio- and phyto-plankton activities)
Bouchet, Sylvain. "Etude de la spéciation biogéochimique du mercure aux interfaces des écosystèmes tidaux côtiers." Pau, 2009. http://www.theses.fr/2009PAUU3008.
The mercury biogeochemistry in coastal ecosystems and especially the transformations and mobility of the mercury species (inorganic mercury, methylated forms, and elemental mercury) have been evaluated with laboratory and field experiments. The mercury speciation and reactivity in superficial sediments have been studied under transient redox conditions using a laboratory microcosm and stable isotopic tracers. These transient conditions influence the transformations and partitioning of the mercury species. These transformations have been related to early diagenetic processes, specific bacterial activities and the evolution of the organic matter. The behavior of added mercury species reveals also the temporal ecosystem response to a chronic contamination. The mercury speciation and reactivity have been investigated at the different interfaces (sediment – water – atmosphere) of the intertidal zone of the Arcachon Bay (SW France). The exchange fluxes as well as transformation potentials have been evaluated in situ using flux chambers and mercury isotopic tracers. The flux intensities and transformation mechanisms exhibit seasonal variations according to the sediment biogeochemical conditions. The intertidal sediment interfaces appear as highly dynamic zones for mercury exchange to the water column and the atmosphere
Le, Coz Yves. "Mise en évidence de bandes dipolaires dans les isotopes de mercure à l'aide du multidétecteur EUROGAM." Lyon 1, 1995. http://www.theses.fr/1995LYO10030.
Частини книг з теми "Isotopes du mercure":
Bergquist, Bridget A. "Mercury Isotopes." In Encyclopedia of Earth Sciences Series, 900–906. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-39312-4_122.
Bergquist, Bridget A. "Mercury Isotopes." In Encyclopedia of Earth Sciences Series, 1–7. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-39193-9_122-1.
Blum, Joel D. "Applications of Stable Mercury Isotopes to Biogeochemistry." In Advances in Isotope Geochemistry, 229–45. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-10637-8_12.
Sukhoruchkin, S. I., and Z. N. Soroko. "Graphs for Isotopes of 80-Hg(Mercury)." In Nuclei with Z = 55 - 100, 16202–9. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-70609-0_7706.
Hintelmann, Holger, and Wang Zheng. "Tracking Geochemical Transformations and Transport of Mercury through Isotope Fractionation." In Environmental Chemistry and Toxicology of Mercury, 293–327. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118146644.ch9.
Hintelmann, Holger, and Nives Ogrinc. "Determination of Stable Mercury Isotopes by ICP/MS and Their Application in Environmental Studies." In ACS Symposium Series, 321–38. Washington, DC: American Chemical Society, 2002. http://dx.doi.org/10.1021/bk-2003-0835.ch021.
Gunning, Harry E., and Otto P. Strausz. "Isotopic Effects and the Mechanism of Energy Transfer in Mercury Photosensitization." In Advances in Photochemistry, 209–74. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470133316.ch7.
Hintelmann, Holger. "Use of Stable Isotopes in Mercury Research." In Mercury in the Environment, 55–72. University of California Press, 2012. http://dx.doi.org/10.1525/california/9780520271630.003.0004.
Blum, Joel D., and Marcus W. Johnson. "17 Recent Developments in Mercury Stable Isotope Analysis." In Non-Traditional Stable Isotopes, edited by Fang-Zhen Teng, James Watkins, and Nicolas Dauphas. Berlin, Boston: De Gruyter, 2017. http://dx.doi.org/10.1515/9783110545630-018.
"CHAPTER 4. Use of Stable Isotopes in Mercury Research." In Mercury in the Environment, 55–72. University of California Press, 2019. http://dx.doi.org/10.1525/9780520951396-008.
Тези доповідей конференцій з теми "Isotopes du mercure":
Chen, Xing, Honglei Yang, Peng Fei, Xiaobo Xue, Shengkang Zhang, and Jun Ge. "The high frequency electrodeless mercury isotope lamp." In 2020 Joint Conference of the IEEE International Frequency Control Symposium and International Symposium on Applications of Ferroelectrics (IFCS-ISAF). IEEE, 2020. http://dx.doi.org/10.1109/ifcs-isaf41089.2020.9234934.
Kwon, Sae Yun. "Can mercury stable isotopes aid monitoring and effectiveness evaluation of the Minamata Convention on Mercury?" In Goldschmidt2021. France: European Association of Geochemistry, 2021. http://dx.doi.org/10.7185/gold2021.4959.
Abramochkin, A. I., V. A. Korolkov, N. G. Mutnitsky, V. V. Tatur, and A. A. Tikhomirov. "Portable mercury gas analyzer with a lamp filled with natural mercury isotope mixture." In XXI International Symposium Atmospheric and Ocean Optics. Atmospheric Physics, edited by Oleg A. Romanovskii. SPIE, 2015. http://dx.doi.org/10.1117/12.2205335.
Szponar, Natalie, Claudia Vega, David Mclagan, Jacqueline Gerson, Emily Bernhardt, Carl Mitchell, Frank Wania, Luis Fernandez, and Bridget Bergquist. "Tracing Atmospheric Mercury in the Peruvian Amazon Using Hg Isotopes." In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.2521.
Zheng, Wang, Geoffrey J. Gilleaudeau, Linda C. Kah, and Ariel D. Anbar. "MERCURY STABLE ISOTOPES AS A NOVEL PROXY FOR PHOTIC ZONE EUXINIA." In GSA Annual Meeting in Seattle, Washington, USA - 2017. Geological Society of America, 2017. http://dx.doi.org/10.1130/abs/2017am-307848.
Bouchet, Sylvain, Erik Björn, David Amouroux, Anne Soerensen, and Emmanuel Tessier. "Mercury cycling in the Baltic Sea: can stable isotopes help us ?" In Goldschmidt2021. France: European Association of Geochemistry, 2021. http://dx.doi.org/10.7185/gold2021.5803.
Zheng, Wang, Swapan Sahoo, Anwen Zhou, Yaqiu Zhao, and Yuanming Zhang. "Mercury Enrichment and Isotope Compositions in the Ediacaran Doushantuo Formation." In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.3183.
Malberti, Luisa, Christelle Lagane, Jeroen Sonke, and David Point. "Carbon and mercury stable isotope fractionation during aqueous MeHg photoreduction." In Goldschmidt2021. France: European Association of Geochemistry, 2021. http://dx.doi.org/10.7185/gold2021.5799.
Zhao, Yaqiu, and Wang Zheng. "Mercury stable isotope fractionation during aqueous photoreduction in sulfidic environment." In Goldschmidt2021. France: European Association of Geochemistry, 2021. http://dx.doi.org/10.7185/gold2021.5965.
Nason, Krystal, Natalie Szponar, Claudia Vega, Jacqueline Gerson, Emily Berhardt, Luis Fernandez, and Bridget Bergquist. "Identifying Sources of Mercury in Peruvian Amazon Aquatic Systems Using Hg Stable Isotopes." In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.1894.
Звіти організацій з теми "Isotopes du mercure":
Douglas, Thomas, and Joel Blum. Mercury isotopes reveal atmospheric gaseous mercury deposition directly to the Arctic coastal snowpack. Engineer Research and Development Center (U.S.), June 2021. http://dx.doi.org/10.21079/11681/41046.
Douglas, Thomas, Matthew Sturm, Joel Blum, Christopher Polashenski, Svetlana Stuefer, Christopher Hiemstra, Alexandra Steffen, Simon Filhol, and Romain Prevost. A pulse of mercury and major ions in snowmelt runoff from a small Arctic Alaska watershed. Engineer Research and Development Center (U.S.), July 2021. http://dx.doi.org/10.21079/11681/41203.
Johnson, Thomas M. Final Project Report: "Exploratory Research: Mercury Stable Isotopes as Indicators of the Biogeochemical Cycling of Mercury". Office of Scientific and Technical Information (OSTI), August 2012. http://dx.doi.org/10.2172/1047186.
Blum, Joel D., Jason D. Demers, Baohua Gu, Feng He, and Wang Zheng. Isotopic Characterization of Biogeochemical Pools of Mercury and Determination of Reaction Pathways for Mercury Methylation. Office of Scientific and Technical Information (OSTI), February 2016. http://dx.doi.org/10.2172/1239649.
Geochemistry, geochronology, mineralogy, and geology suggest sources of and controls on mineral systems in the southern Toquima Range, Nye County, Nevada; with geochemistry maps of gold, silver, mercury, arsenic, antimony, zinc, copper, lead, molybdenum, bismuth, iron, titanium, vanadium, cobalt, beryllium, boron, fluorine, and sulfur; and with a section on lead associations, mineralogy and paragenesis, and isotopes. US Geological Survey, 2003. http://dx.doi.org/10.3133/mf2327c.