Base de dados : MEDLINE
Pesquisa : D01.268.271.100 [Categoria DeCS]
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[PMID]:29023595
[Au] Autor:Lamart S; Miller BW; Van der Meeren A; Tazrart A; Angulo JF; Griffiths NM
[Ad] Endereço:Laboratoire de RadioToxicologie, CEA, Université Paris-Saclay, Arpajon, France.
[Ti] Título:Actinide bioimaging in tissues: Comparison of emulsion and solid track autoradiography techniques with the iQID camera.
[So] Source:PLoS One;12(10):e0186370, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:This work presents a comparison of three autoradiography techniques for imaging biological samples contaminated with actinides: emulsion-based, plastic-based autoradiography and a quantitative digital technique, the iQID camera, based on the numerical analysis of light from a scintillator screen. In radiation toxicology it has been important to develop means of imaging actinide distribution in tissues as these radionuclides may be heterogeneously distributed within and between tissues after internal contamination. Actinide distribution determines which cells are exposed to alpha radiation and is thus potentially critical for assessing absorbed dose. The comparison was carried out by generating autoradiographs of the same biological samples contaminated with actinides with the three autoradiography techniques. These samples were cell preparations or tissue sections collected from animals contaminated with different physico-chemical forms of actinides. The autoradiograph characteristics and the performances of the techniques were evaluated and discussed mainly in terms of acquisition process, activity distribution patterns, spatial resolution and feasibility of activity quantification. The obtained autoradiographs presented similar actinide distribution at low magnification. Out of the three techniques, emulsion autoradiography is the only one to provide a highly-resolved image of the actinide distribution inherently superimposed on the biological sample. Emulsion autoradiography is hence best interpreted at higher magnifications. However, this technique is destructive for the biological sample. Both emulsion- and plastic-based autoradiography record alpha tracks and thus enabled the differentiation between ionized forms of actinides and oxide particles. This feature can help in the evaluation of decorporation therapy efficacy. The most recent technique, the iQID camera, presents several additional features: real-time imaging, separate imaging of alpha particles and gamma rays, and alpha activity quantification. The comparison of these three autoradiography techniques showed that they are complementary and the choice of the technique depends on the purpose of the imaging experiment.
[Mh] Termos MeSH primário: Autorradiografia/métodos
[Mh] Termos MeSH secundário: Elementos da Série Actinoide/química
Partículas alfa
Animais
Autorradiografia/instrumentação
Pulmão/patologia
Músculo Esquelético/patologia
Ratos
Pele/patologia
[Pt] Tipo de publicação:COMPARATIVE STUDY; JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Actinoid Series Elements)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171024
[Lr] Data última revisão:
171024
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171013
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0186370


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[PMID]:28735713
[Au] Autor:Gadly T; Mohapatra PK; Patre DK; Gujar RB; Gupta A; Ballal A; Ghosh SK
[Ad] Endereço:Bio-organic Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India.
[Ti] Título:Superparamagnetic graphene oxide-magnetite nanoparticle composites for uptake of actinide ions from mildly acidic feeds.
[So] Source:J Chromatogr A;1513:18-26, 2017 Sep 01.
[Is] ISSN:1873-3778
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:Super paramagnetic graphene oxide (GO) - Fe O nanoparticle composites were prepared and characterized by conventional techniques such as XRD, SEM, EDX, FT-IR, Raman, XPS, DLS and zeta potential, etc. TEM studies have confirmed nanoparticle nature of the composites. The GO-magnetic nanoparticle composites can be dispersed in mildly acidic aqueous solutions and get concentrated in a small volume under application of an external magnetic field. The composites were evaluated for the uptake of actinide ions such as Am , UO , Th and Pu from mildly acidic aqueous solutions. Am sorption sharply increased with pH as the K values increased from about 10 at pH 1 to 10 at pH 3 beyond which a plateau in the K values was seen. Eu displayed nearly comparable uptake behaviour to that of Am while the uptake of other metal ions followed the trend: Pu(IV)>Th(IV)>>UO . The adsorption behaviour of Am onto the graphene oxide - Fe O nanoparticle composites fitted very well to the Langmuir as well as Temkin isotherm models. The desorption rate (using 1M HNO ) was fast and reusability study results were highly encouraging. The very high uptake values suggest possible application of the magnetic nanoparticles in radioactive waste remediation in natural ground water.
[Mh] Termos MeSH primário: Elementos da Série Actinoide/isolamento & purificação
Grafite/química
Nanopartículas de Magnetita/química
Nanocompostos/química
[Mh] Termos MeSH secundário: Adsorção
Concentração de Íons de Hidrogênio
Microscopia Eletrônica de Transmissão
Óxidos/química
Tamanho da Partícula
Resíduos Radioativos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Actinoid Series Elements); 0 (Magnetite Nanoparticles); 0 (Oxides); 0 (Radioactive Waste); 7782-42-5 (Graphite)
[Em] Mês de entrada:1708
[Cu] Atualização por classe:170825
[Lr] Data última revisão:
170825
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170725
[St] Status:MEDLINE


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[PMID]:28408043
[Au] Autor:Ansari SA; Mohapatra PK
[Ad] Endereço:Radiochemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India.
[Ti] Título:A review on solid phase extraction of actinides and lanthanides with amide based extractants.
[So] Source:J Chromatogr A;1499:1-20, 2017 May 26.
[Is] ISSN:1873-3778
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:Solid phase extraction is gaining attention from separation scientists due to its high chromatographic utility. Though both grafted and impregnated forms of solid phase extraction resins are popular, the later is easy to make by impregnating a given organic extractant on to an inert solid support. Solid phase extraction on an impregnated support, also known as extraction chromatography, combines the advantages of liquid-liquid extraction and the ion exchange chromatography methods. On the flip side, the impregnated extraction chromatographic resins are less stable against leaching out of the organic extractant from the pores of the support material. Grafted resins, on the other hand, have a higher stability, which allows their prolong use. The goal of this article is a brief literature review on reported actinide and lanthanide separation methods based on solid phase extractants of both the types, i.e., (i) ligand impregnation on the solid support or (ii) ligand functionalized polymers (chemically bonded resins). Though the literature survey reveals an enormous volume of studies on the extraction chromatographic separation of actinides and lanthanides using several extractants, the focus of the present article is limited to the work carried out with amide based ligands, viz. monoamides, diamides and diglycolamides. The emphasis will be on reported applied experimental results rather than on data pertaining fundamental metal complexation.
[Mh] Termos MeSH primário: Elementos da Série Actinoide/isolamento & purificação
Amidas/química
Elementos da Série dos Lantanídeos/isolamento & purificação
Extração em Fase Sólida
[Mh] Termos MeSH secundário: Ligantes
Polímeros/química
Extração em Fase Sólida/normas
[Pt] Tipo de publicação:JOURNAL ARTICLE; REVIEW
[Nm] Nome de substância:
0 (Actinoid Series Elements); 0 (Amides); 0 (Lanthanoid Series Elements); 0 (Ligands); 0 (Polymers)
[Em] Mês de entrada:1707
[Cu] Atualização por classe:170713
[Lr] Data última revisão:
170713
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170415
[St] Status:MEDLINE


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[PMID]:28276896
[Au] Autor:Tazrart A; Bolzinger MA; Coudert S; Lamart S; Miller BW; Angulo JF; Briançon S; Griffiths NM
[Ad] Endereço:a iRCM/DRF/CEA, Laboratoire de Radio Toxicologie, CEA, Université Paris-Saclay , Arpajon , France.
[Ti] Título:Skin absorption of actinides: influence of solvents or chelates on skin penetration ex vivo.
[So] Source:Int J Radiat Biol;93(6):607-616, 2017 Jun.
[Is] ISSN:1362-3095
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:PURPOSE: To evaluate skin penetration and retention of americium (Am) and plutonium (Pu), in different chemical forms relevant to the nuclear industry and to treatment by chelation. MATERIALS AND METHODS: Percutaneous penetration of different Am and Pu forms were evaluated using viable pig skin with the Franz cell diffusion system. The behavior of the complex Pu-tributyl phosphate (Pu-TBP), Am or Pu complexed to the chelator Diethylene triamine pentaacetic acid (DTPA) and the effect of dimethyl sulfoxide (DMSO) was assessed. Radioactivity was measured in skin and receiver compartments. Three approaches were used to visualize activity in skin including the recent iQID technique for quantification. RESULTS: Transfer of Am was 24-fold greater than Pu and Pu-TBP complex penetration was enhanced by 500-fold. Actinide-DTPA transfer was greater than the Am or Pu alone (17-fold and 148-fold, respectively). The stratum corneum retained the majority of activity in all cases and both DMSO and TBP enhanced skin retention of Am and Pu, respectively. Histological and bioimaging data confirmed these results and the iQID camera allowed the quantification of skin activity. CONCLUSIONS: Skin penetration and fixation profiles are different depending on the chemical actinide form. Altered behavior of Pu-TBP and actinide-DTPA complexes reinforces the need to address decontamination protocols.
[Mh] Termos MeSH primário: Elementos da Série Actinoide/farmacocinética
Quelantes/administração & dosagem
Absorção Cutânea/fisiologia
Pele/efeitos dos fármacos
Pele/metabolismo
Solventes/administração & dosagem
[Mh] Termos MeSH secundário: Absorção de Radiação/efeitos dos fármacos
Absorção de Radiação/fisiologia
Administração Tópica
Animais
Terapia por Quelação/métodos
Descontaminação/métodos
Técnicas In Vitro
Absorção Cutânea/efeitos dos fármacos
Suínos
Distribuição Tecidual/efeitos dos fármacos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Actinoid Series Elements); 0 (Chelating Agents); 0 (Solvents)
[Em] Mês de entrada:1708
[Cu] Atualização por classe:170818
[Lr] Data última revisão:
170818
[Sb] Subgrupo de revista:IM; S
[Da] Data de entrada para processamento:170310
[St] Status:MEDLINE
[do] DOI:10.1080/09553002.2017.1293865


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[PMID]:28245201
[Au] Autor:Lamart S; Griffiths NM; Tchitchek N; Angulo JF; Van der Meeren A
[Ad] Endereço:Laboratoire de RadioToxicologie, CEA, Université Paris-Saclay, 91297 Arpajon, France.
[Ti] Título:Analysis methodology and development of a statistical tool for biodistribution data from internal contamination with actinides.
[So] Source:J Radiol Prot;37(1):296-308, 2017 Mar.
[Is] ISSN:1361-6498
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:The aim of this work was to develop a computational tool that integrates several statistical analysis features for biodistribution data from internal contamination experiments. These data represent actinide levels in biological compartments as a function of time and are derived from activity measurements in tissues and excreta. These experiments aim at assessing the influence of different contamination conditions (e.g. intake route or radioelement) on the biological behavior of the contaminant. The ever increasing number of datasets and diversity of experimental conditions make the handling and analysis of biodistribution data difficult. This work sought to facilitate the statistical analysis of a large number of datasets and the comparison of results from diverse experimental conditions. Functional modules were developed using the open-source programming language R to facilitate specific operations: descriptive statistics, visual comparison, curve fitting, and implementation of biokinetic models. In addition, the structure of the datasets was harmonized using the same table format. Analysis outputs can be written in text files and updated data can be written in the consistent table format. Hence, a data repository is built progressively, which is essential for the optimal use of animal data. Graphical representations can be automatically generated and saved as image files. The resulting computational tool was applied using data derived from wound contamination experiments conducted under different conditions. In facilitating biodistribution data handling and statistical analyses, this computational tool ensures faster analyses and a better reproducibility compared with the use of multiple office software applications. Furthermore, re-analysis of archival data and comparison of data from different sources is made much easier. Hence this tool will help to understand better the influence of contamination characteristics on actinide biokinetics. Our approach can aid the optimization of treatment protocols and therefore contribute to the improvement of the medical response after internal contamination with actinides.
[Mh] Termos MeSH primário: Elementos da Série Actinoide/análise
Elementos da Série Actinoide/farmacocinética
Bioensaio/métodos
Modelos Estatísticos
Radiometria/métodos
[Mh] Termos MeSH secundário: Algoritmos
Carga Corporal (Radioterapia)
Seres Humanos
Dose de Radiação
Eficiência Biológica Relativa
Software
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Actinoid Series Elements)
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170918
[Lr] Data última revisão:
170918
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170301
[St] Status:MEDLINE
[do] DOI:10.1088/1361-6498/37/1/296


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[PMID]:27570166
[Au] Autor:Finck N; Nedel S; Dideriksen K; Schlegel ML
[Ad] Endereço:Institute for Nuclear Waste Disposal (INE), Karlsruhe Institute of Technology (KIT) , P.O. Box 3640, D-76021 Karlsruhe, Germany.
[Ti] Título:Trivalent Actinide Uptake by Iron (Hydr)oxides.
[So] Source:Environ Sci Technol;50(19):10428-10436, 2016 Oct 04.
[Is] ISSN:1520-5851
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The retention of Am(III) by coprecipitation with or adsorption onto preformed magnetite was investigated by X-ray diffraction (XRD), solution chemistry, and X-ray absorption spectroscopy (XAS). In the coprecipitation experiment, XAS data indicated the presence of seven O atoms at 2.44(1) Å, and can be explained by an Am incorporation at Fe structural sites at the magnetite surface. Next-nearest Fe were detected at distances suggesting that Am and Fe polyhedra share corners in geometries ranging from bent to close to linear Am-O-Fe bonds. After aging for two years, the coordination number and the distance to the first O shell significantly decreased, and atomic shells were detected at higher distances. These data suggest a structural reorganization and an increase in structural order around sorbed Am. Upon contact with preformed Fe O , Am(III) forms surface complexes with cosorbed Fe at the surface of magnetite, a possible consequence of the high concentration of dissolved Fe. In a separate experiment, chloride green rust (GR) was synthesized in the presence of Am(III), and subsequently converted to Fe(OH) (s) intermixed with magnetite. XAS data indicated that the actinide is successively located first at octahedral brucite-like sites in the GR precursor, then in Fe(OH) (s), an environment markedly distinct from that of Am(III) in Fe O . The findings indicate that the magnetite formation pathway dictates the magnitude of Am(III) incorporation within this solid.
[Mh] Termos MeSH primário: Ferro/química
Óxidos/química
[Mh] Termos MeSH secundário: Elementos da Série Actinoide
Espectroscopia por Absorção de Raios X
Difração de Raios X
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Actinoid Series Elements); 0 (Oxides); E1UOL152H7 (Iron)
[Em] Mês de entrada:1706
[Cu] Atualização por classe:170608
[Lr] Data última revisão:
170608
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160830
[St] Status:MEDLINE


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[PMID]:27140904
[Au] Autor:Fernandes MM; Scheinost AC; Baeyens B
[Ad] Endereço:Paul Scherrer Institute, Laboratory for Waste Management, 5232 Villigen PSI, Switzerland. Electronic address: maria.marques@psi.ch.
[Ti] Título:Sorption of trivalent lanthanides and actinides onto montmorillonite: Macroscopic, thermodynamic and structural evidence for ternary hydroxo and carbonato surface complexes on multiple sorption sites.
[So] Source:Water Res;99:74-82, 2016 Aug 01.
[Is] ISSN:1879-2448
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:The credibility of long-term safety assessments of radioactive waste repositories may be greatly enhanced by a molecular level understanding of the sorption processes onto individual minerals present in the near- and far-fields. In this study we couple macroscopic sorption experiments to surface complexation modelling and spectroscopic investigations, including extended X-ray absorption fine structure (EXAFS) and time-resolved laser fluorescence spectroscopies (TRLFS), to elucidate the uptake mechanism of trivalent lanthanides and actinides (Ln/An(III)) by montmorillonite in the absence and presence of dissolved carbonate. Based on the experimental sorption isotherms for the carbonate-free system, the previously developed 2 site protolysis non electrostatic surface complexation and cation exchange (2SPNE SC/CE) model needed to be complemented with an additional surface complexation reaction onto weak sites. The fitting of sorption isotherms in the presence of carbonate required refinement of the previously published model by reducing the strong site capacity and by adding the formation of Ln/An(III)-carbonato complexes both on strong and weak sites. EXAFS spectra of selected Am samples and TRLFS spectra of selected Cm samples corroborate the model assumptions by showing the existence of different surface complexation sites and evidencing the formation of Ln/An(III) carbonate surface complexes. In the absence of carbonate and at low loadings, Ln/An(III) form strong inner-sphere complexes through binding to three Al(O,OH)6 octahedra, most likely by occupying vacant sites in the octahedral layers of montmorillonite, which are exposed on {010} and {110} edge faces. At higher loadings, Ln/An(III) binds to only one Al octahedron, forming a weaker, edge-sharing surface complex. In the presence of carbonate, we identified a ternary mono- or dicarbonato Ln/An(III) complex binding directly to one Al(O,OH)6 octahedron, revealing that type-A ternary complexes form with the one or two carbonate groups pointing away from the surface into the solution phase. Within the spectroscopically observable concentration range these complexes could only be identified on the weak sites, in line with the small strong site capacity suggested by the refined sorption model. When the solubility of carbonates was exceeded, formation of an Am carbonate hydroxide could be identified. The excellent agreement between the thermodynamic model parameters obtained by fitting the macroscopic data, and the spectroscopically identified mechanisms, demonstrates the mature state of the 2SPNE SC/CE model for predicting and quantifying the retention of Ln/An(III) elements by montmorillonite-rich clay rocks.
[Mh] Termos MeSH primário: Bentonita/química
Elementos da Série dos Lantanídeos
[Mh] Termos MeSH secundário: Elementos da Série Actinoide
Adsorção
Modelos Químicos
Termodinâmica
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Actinoid Series Elements); 0 (Lanthanoid Series Elements); 1302-78-9 (Bentonite)
[Em] Mês de entrada:1705
[Cu] Atualização por classe:170902
[Lr] Data última revisão:
170902
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160504
[St] Status:MEDLINE


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[PMID]:27103649
[Au] Autor:Ören Ü; Nilsson J; Herrnsdorf L; Rääf CL; Mattsson S
[Ad] Endereço:Medical Radiation Physics, Department of Translational Medicine, Lund University, Skåne University Hospital Malmö, SE-205 02 Malmö, Sweden Unal.oren@med.lu.se.
[Ti] Título:SILICON DIODE AS AN ALPHA PARTICLE DETECTOR AND SPECTROMETER FOR DIRECT FIELD MEASUREMENTS.
[So] Source:Radiat Prot Dosimetry;170(1-4):247-51, 2016 Sep.
[Is] ISSN:1742-3406
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:A windowless silicon (Si) diode (4 mm(2)) was evaluated as alpha particle detector and spectrometer for field measurements. It was irradiated with alpha particles from a (241)Am (2.3 kBq) and a (210)Po (9 kBq) source at source-detector distances (SDD) of 0.5, 1.0 and 1.8 cm. The energy resolution in terms of full width at half maximum was 281, 148 and 113 keV for SDD of 0.5, 1.0 and 1.8 cm, respectively. The minimum detectable activity increased from 0.08 to 0.83 Bq when the SDD increased from 0.5 to 1.8 cm. The detector has the potential for several alpha spectrometric applications, such as monitoring for wound, skin and surface contamination at nuclear fuel facilities, nuclear power plants and facilities handling radioactive waste. Other areas are environmental surveys following releases of actinides at accidents in nuclear power plants and in connection with other radiological or nuclear scenarios.
[Mh] Termos MeSH primário: Elementos da Série Actinoide/química
Partículas alfa
Dose de Radiação
Lesões por Radiação/diagnóstico
Monitoramento de Radiação/métodos
Silício/química
Pele/efeitos da radiação
[Mh] Termos MeSH secundário: Amerício/análise
Seres Humanos
Centrais Nucleares
Polônio/análise
Monitoramento de Radiação/instrumentação
Liberação Nociva de Radioativos
Resíduos Radioativos
Eliminação de Resíduos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Actinoid Series Elements); 0 (Radioactive Waste); DQY03U61EJ (Polonium); VW92PHU2UY (Americium); Z4152N8IUI (Silicon)
[Em] Mês de entrada:1704
[Cu] Atualização por classe:170404
[Lr] Data última revisão:
170404
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160423
[St] Status:MEDLINE
[do] DOI:10.1093/rpd/ncw089


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[PMID]:27040048
[Au] Autor:Sakama M
[Ad] Endereço:Department of Radiation Science and Technology, Institute of Biomedical Sciences, Tokushima University Graduate School.
[Ti] Título:Recent great impact by an Isotope Separator On-Line (ISOL) in nuclear and radiochemistry.
[So] Source:J Med Invest;63(1-2):19-26, 2016.
[Is] ISSN:1349-6867
[Cp] País de publicação:Japan
[La] Idioma:eng
[Ab] Resumo:On April 9 2015, the Letter article titled "Measurement of the first ionization potential of lawrencium, element 103" is now published at News and Views on Nature (2015) which has been performed by our remarkably Japanese colleagues of nuclear and radiochemistry at JAEA (Japan Atomic Energy Agency). In this review, the author will state that the isotope separator on-line (ISOL) our regularly used, one of mass separation techniques, with a thermal surface ionization makes possible for determining the ionization potential of lawrencium based on the fruitful fundations of developing the ISOL system until now and also ever studying searches for unknown nuclei and these nuclear decay properties around actinide region in the past 20 years.
[Mh] Termos MeSH primário: Laurêncio/isolamento & purificação
Medicina Nuclear/instrumentação
Radioquímica/instrumentação
[Mh] Termos MeSH secundário: Elementos da Série Actinoide/isolamento & purificação
Isótopos/isolamento & purificação
Japão
Espectrometria de Massas/instrumentação
Medicina Nuclear/tendências
Radioquímica/tendências
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T; REVIEW
[Nm] Nome de substância:
0 (Actinoid Series Elements); 0 (Isotopes); QRT37X99RQ (Lawrencium)
[Em] Mês de entrada:1701
[Cu] Atualização por classe:170130
[Lr] Data última revisão:
170130
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160405
[St] Status:MEDLINE
[do] DOI:10.2152/jmi.63.19


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[PMID]:26965642
[Au] Autor:Xu L; Zheng T; Yang S; Zhang L; Wang J; Liu W; Chen L; Diwu J; Chai Z; Wang S
[Ad] Endereço:School for Radiological and Interdisciplinary Sciences (RAD-X), Soochow University , 215123 Suzhou, P. R. China.
[Ti] Título:Uptake Mechanisms of Eu(III) on Hydroxyapatite: A Potential Permeable Reactive Barrier Backfill Material for Trapping Trivalent Minor Actinides.
[So] Source:Environ Sci Technol;50(7):3852-9, 2016 Apr 05.
[Is] ISSN:1520-5851
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The permeable reactive barrier (PRB) technique has attracted an increasing level of attention for the in situ remediation of contaminated groundwater. In this study, the macroscopic uptake behaviors and microscopic speciation of Eu(III) on hydroxyapatite (HAP) were investigated by a combination of theoretical modeling, batch experiments, powder X-ray diffraction (PXRD) fitting, and X-ray absorption spectroscopy (XAS). The underlying removal mechanisms were identified to further assess the application potential of HAP as an effective PRB backfill material. The macroscopic analysis revealed that nearly all dissolved Eu(III) in solution was removed at pH 6.5 within an extremely short reaction time of 5 min. In addition, the thermodynamic calculations, desorption experiments, and PXRD and XAS analyses definitely confirmed the formation of the EuPO4·H2O(s) phase during the process of uptake of dissolved Eu(III) by HAP via the dissolution-precipitation mechanism. A detailed comparison of the present experimental findings and related HAP-metal systems suggests that the relative contribution of precipitation to the total Eu(III) removal increases as the P:Eu ratio decreases. The dosage of HAP-based PRB for the remediation of groundwater polluted by Eu(III) and analogous trivalent actinides [e.g., Am(III) and Cm(III)] should be strictly controlled depending on the dissolved Eu(III) concentration to obtain an optimal P:M (M represents Eu, Am, or Cm) ratio and treatment efficiency.
[Mh] Termos MeSH primário: Durapatita/química
Európio/química
Purificação da Água/métodos
[Mh] Termos MeSH secundário: Elementos da Série Actinoide/química
Água Subterrânea/química
Concentração de Íons de Hidrogênio
Modelos Teóricos
Termodinâmica
Poluentes Químicos da Água/química
Poluentes Radioativos da Água/química
Espectroscopia por Absorção de Raios X
Difração de Raios X
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Actinoid Series Elements); 0 (Water Pollutants, Chemical); 0 (Water Pollutants, Radioactive); 444W947O8O (Europium); 91D9GV0Z28 (Durapatite)
[Em] Mês de entrada:1612
[Cu] Atualização por classe:161230
[Lr] Data última revisão:
161230
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160312
[St] Status:MEDLINE
[do] DOI:10.1021/acs.est.5b05932



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