共查询到20条相似文献,搜索用时 15 毫秒
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M. McCulloch S. K. Fadeff G. M. Mong R. G. Riley D. S. Sklarew B. L. Thomas 《International journal of environmental analytical chemistry》2013,93(2-4):289-293
Abstract DOE Methods for Evaluating Environmental and Waste Management Samples (DOE Methods) is a guidance/methods document to support sampling and analysis activities at DOE sites. DOE Methods is intended to supplement existing guidance documents (e.g., EPA's Test Methods for Evaluating Solid Waste, SW-846), which generally apply to low-level or nonradioactive samples. DOE Methods targets the complexities of DOE radioactive mixed waste and environmental samples. The document contains quality assurance (QA), quality control (QC), safety, sampling, organic analysis, inorganic analysis, and radioanalytical guidance as well as sampling and analytical methods. An addendum is distributed every six months (April and October) with updated guidance and additional methods. DOE Methods provides a vehicle for technology transfer within the environmental restoration (ER) and waste management (WM) (collectively known as EM) community. As DOE Methods evolves, its usefulness and applicability are anticipated to grow to meet the demands of the DOE/EM mission. At the present time, DOE Methods contains methods and guidance information supplied by DOE sites. Because the EM activities in DOE are not unique to the United States, the international environmental community could benefit from the information gathered for the DOE program. This information could provide additional resources for their EM activities. 相似文献
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Radioanalytical Determination of Biogenic Volatile Iodine Emitted from Aqueous Environmental Samples
S. Amachi Y. Muramatsu Y. Kamagata 《Journal of Radioanalytical and Nuclear Chemistry》2000,245(2):337-341
A reliable method using 125I tracer for direct determination of volatile iodine formed in aqueous environmental samples was established. Soil solution, seawater and bacterial cell suspension were selected as model samples, and incubated with 125I–. Volatile inorganic and organic iodine species produced during incubation were collected in silver wool and activated charcoal traps, separately the efficiency of the traps, the storage conditions of 125I– stock solution and the procedures to expel the dissolved volatile iodine from the sample solutions were examined. Formation of biological volatile iodine was observed in all samples, and the dominant iodine species was found to be organic iodine. The advantages of this method are its simplicity, low cost and low detection limit. 相似文献
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Summary Rahman A. Elérhetoség Intézet neve Intézet címe E-mail 相似文献
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Z. Řanda J. Benada J. Kuncíř M. Vobecký J. Frána 《Journal of Radioanalytical and Nuclear Chemistry》1972,11(2):305-337
The elemental compositions of Apollo 11 and Apollo 12 lunar soil samples 10084,141 and 12070,83 and Apollo 12 rock fragment
12063,73 were determined by non-destructive radioanalytical methods. Main mineral fractions and glasses separated from these
samples were analyzed as well. Instrumental neutron activation analysis (INAA) was used to determine Na, Mg, Al, Si, K, Ca,
Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Zr, Cs, Ba La, Ce, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Tm, Yb, Lu, Hf, Ta, W, Ir, Au, Th and U. A method
of delayed neutron counting was used for the determination of uranium, and non-dispersive radioisotopic X-ray fluorescence
analysis was applied to the determination of Ti, Fe, Sr, Y and Zr. 相似文献
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D. Todorovsky K. Kostadinov E. Taneva Zh. Dimitrova 《Journal of Radioanalytical and Nuclear Chemistry》1982,75(1-2):107-111
A radioanalytical procedure for the determination of the chemical forms of35S in reactor irradiated crystals AlCl3, FeCl3 and AlCl3?FeCl3 is described. The method includes:35S extraction with trichloroethylene, precipitation of35S2? as iron sulfide and of (35SO 4 2? +35SO 3 2? ) as Ba-salts. All fractions are converted to, and measured as, BaSO4. 相似文献
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H. A. Das P. A. C. Elands H. A. Van der Sloot J. Zonderhuis 《Journal of Radioanalytical and Nuclear Chemistry》1982,74(1-2):263-272
The use of neutron activated fly ash to measure its leaching by water is discussed. Results can be expressed by a simple mathematical
equation which permits the characterization of the process in terms of four parameters. 相似文献
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Polymer electrolytes that have been developed for battery applications fall into two general classes, neat or “pure” polymer and plasticized or gel in which the polymer is combined with a conducting organic electrolyte. The polyethylene oxide (PEO) and its modifications are typical of the “pure” polymer electrolytes. They have poor conductivity at room temperatures, but at elevated temperatures, their conductivity is of the order of 10−3 to 10−4 S/cm. The PEO electrolytes have found application in the high temperature (>60°C) lithium metal anode battery systems. The high temperature necessary for good operation makes them unsuitable for use in small consumer appliances. The polymer electrolyte battery development activities have resulted in several high performance battery systems now just entering the market. Not all of the developments have resulted in commercial cell production. The commercialization activities of high performance lithium‐ion (Li‐Ion) batteries have been based on two general plastic polymer systems: poly‐vinylidene difluoride‐hexafluoropropylene copolymer (PVdF‐HFP) and polyacrylates. The polymer cells are expected to have advantages in manufacturing, flexibility, thin cell formats and lightweight packaging. Important parameters in PVdF gel electrolyte performance include the electrolyte type (combination of organic carbonates), temperature, and HFP copolymer content. Li‐Ion coin cells fabricated with a polyolefin separator with either liquid electrolyte or with the PVdF gel polymer electrolyte have equivalent performance. 相似文献
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《Analytical letters》2012,45(2):181-191
Abstract A method is described for the analysis of phosphorus in geological samples involving the decomposition of the sample with hydrofluoric acid in a quartz tube and the measurement of phosphate ion concentration using an ion chromatograph (Dionex 10) with an anion separator column (Wescan anion 269-001). The detection limit is between 0.05-0.5% P2O5 in the original sample. Multiple analyses of eight U.S.G.S. standard rocks yielded a relative standard deviation range between 2.37-16.67%. In excess of 15 samples can be analyzed in an 8 hour day. 相似文献
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Hyun-Ha Kim Yoshiyuki Teramoto Atsushi Ogata Hideyuki Takagi Tetsuya Nanba 《Plasma Chemistry and Plasma Processing》2016,36(1):45-72
The current status of plasma-catalysis research and the associated possible applications are outlined. A basic explanation of plasma chemistry is given, which is then used as a foundation to indicate the research vector for the ongoing development of various applications. As an example of an environmental application, volatile organic compound decomposition using plasma-catalysis is discussed in depth, from the fundamental concept to the current industrial application status. As a potential application of plasma-catalysis towards the realization of a future “hydrogen society”, ammonia synthesis is discussed in terms of current social attitudes and regulations, along with historical developments. Additionally, up-to-date information on the fundamentals of the nonthermal plasma interaction with a catalyst is provided. 相似文献
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Methodologies for generating carbon materials from unusual natural sources like Limonea acidissima and Calotropis gigantea are reported. The carbon materials thus obtained have been characterized using a variety of tools. The possibility of modulating the textural properties of these materials has been examined. The carbon materials synthesized have been exploited for specific applications, such as support for noble metals for use in Direct Methanol Fuel Cells and as support for heteropoly acid for the production of gasoline additive. In addition, the utility of some of the activated carbon materials (from commercial sources) for the removal of sulphur from crude petroleum sources is also examined. 相似文献
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This study compared recovery of fecal coliform bacteria from sewage by Colilert-18 and Standard Methods 9222D (membrane-Fecal Coliform medium) in accordance with the U.S. Environmental Protection Agency (EPA) Alternative Test Protocol (ATP). Samples were collected from 10 different wastewater treatment plants in the northeastern United States and tested in a single laboratory. Twenty replicates of each sample were analyzed by each method, and 200 positive and 200 negative responses were confirmed for each method. Recovery of fecal coliforms by Colilert-18 was significantly higher than (8 of 10 sites) or statistically equivalent to (1 of 10 sites) recovery by the reference method (Standard Methods 9222D) for samples from all but one site. Both methods had low false-positive rates (< 2%); however, the false-negative rate observed with Standard Methods 9222D (21.5%) was substantially higher than that observed with Colilert-18 (7%). The accuracy rates of the two methods were calculated as 96.5 and 88.9% for Colilert-18 and Standard Methods 9222D, respectively. The results of this study demonstrate that Colilert-18 meets the acceptance criteria for alternative methods specified in the EPA ATP. 相似文献