共查询到19条相似文献,搜索用时 46 毫秒
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稀土元素分离检测技术新进展 总被引:3,自引:2,他引:3
对2003年以来稀土元素分离检测技术的新进展进行了评述,重点集中于各种新型分离技术、新型检测技术及其在稀土元素分析中的应用。对于离子液体、纳米材料、离子印迹聚合物等新型材料以及浊点萃取、膜萃取、毛细管电泳等新型技术在稀士元素分离中的应用进行了详细讨论,并对中子活化分析、等离子体原子发射光谱和等离子体质谱在稀土元素检测中的应用进行了综述,重点讨论了等离子体质谱技术的应用。在回顾稀土元素分离检测技术进展的同时,对其在未来几年的发展趋势进行了评述。 相似文献
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单一稀土元素检测方法的新近进展 总被引:2,自引:0,他引:2
本文对1999~2004年间有关单一稀土元素检测方法的研究进展进行了综述,内容包括原子吸收/原子荧光光谱法,荧光光度法,X-射线荧光光谱法,中子活化分析,电感耦合等离子体原子发射光谱法、电感耦合等离子体质谱法以及其干扰效应、进样技术和分析应用.引用文献127篇. 相似文献
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G. Henke 《Journal of Radioanalytical and Nuclear Chemistry》1977,39(1-2):69-83
Rare earth concentrations in 65 Opium, Cannabis and Cannabis resin samples seized from various parts of world were determined
by destructive NAA. Great variations in absolute element concentrations, but only small significant differences of rare earth
concentration ratios were found, indicating inconsiderable biogeochemical fractionation. The mean values of these ratios correspond
with the relative abundances of the rare earths in the upper continental earth's crust. 相似文献
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H. Higuchi K. Tomura H. Hamaguchi 《Journal of Radioanalytical and Nuclear Chemistry》1970,5(2):207-222
A Ge(Li) detector combined with cation exchange separation has been used for the determination of 12 rare-earth elements (La,
Ce, Nd, Sm, Eu, Gd, Tb, Ho, Er, Tm, Yb, and Lu) in rock samples by neutron activation analysis. After purification by the
conventional hydroxide-fluoride precipitation, the rare-earth elements are separated into two fractions, light (La-Tb) and
heavy (Ho-Lu), by EDTA cation exchange, and the γ-activities of the two fractions are measured by a Ge(Li) detector. The heavy
rare-earths, such as Ho, Er, and Tm, can be easily γ-counted without serious interference from the intense Compton background
and photopeaks due to the light rare-earths such as140La,153Sm,152Eu, and160Tb. The chemical yields (60%) for the individual rare-earths are determined by a reactivation technique. The results obtained
for the U.S. Geological Survey standard rocks G-1 and W-1 are compared with the previously reported data. 相似文献
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K. S. Park N. B. Kim Y. S. Kim K. Y. Lee 《Journal of Radioanalytical and Nuclear Chemistry》1987,114(2):359-365
The relative ans single comparator methods have been applied to determine 7 rare-earth elements and U, Th in Korean Monazites by 14.5 MeV neutron activation analysis. The (n, 2n) nuclear reactions are used for all elements except La, for which (n, p) reaction is used. Al is used as a flux monitor for the relative method and as a singlle comparator for the single comparator method. The analytical results obtained by the two methods agree well within 3% deviation except for Sm and Gd. These results are also compared with the result obtained by a single comparator method using reactor neutron. 相似文献
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Keung-Shik Park Nak Bae Kim Hyung Joo Woo Kil Yong Lee Wan Hong Sang Ki Chun 《Journal of Radioanalytical and Nuclear Chemistry》1992,160(2):529-538
For the separation of rare-earth elements from steel, with a cation exchange resin, separation experiments were performed on NIST reference materials of SRM-363 and SRM-364. Iron, Na, Cr, Mn, Co, Cu, As, Mo, Sb and W were separated in 2M hydrochloric acid, five rare-earth elements, La, Ce, Pr, Nd and Sm and three other elements, Hf, Zr and Ba were separated using 8M nitric acid. Each element was determined by a single comparator method using two monitors, gold and cobalt. 相似文献
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A versatile, rapid and easy synthesis of pure rare-earth-(RE) hexaboride powders was developed, without resorting to hazardous precursors or generating undesired, ineliminable, side products. To this purpose, we employed a metathesis reaction, typically starting from a mixture of a hydrated rare earth trichloride and MgB2, kept at 650 °C for 1 h under vacuum. This methodology affords nanosized RE hexaborides, with average crystallite (domain) sizes down to a few nanometers, useful for tailoring the functional performances of the MgB2 superconducting phase produced by the reactive liquid infiltration method. For the powders showing the lowest average domain sizes (YbB6 and EuB6), an unconventional microstructural analysis, based on Total Scattering methods and on the Debye Function Approach, was also performed, which provided the complete nanocrystal size distributions. 相似文献
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F. Van den Bergh F. Adams J. Hoste 《Journal of Radioanalytical and Nuclear Chemistry》1970,4(2):347-353
Neutron activation analysis was applied to the determination of La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Yb, Lu and Th in rare-earth
concentrates resulting from minerals. High-resolution gamma-ray spectrometry with a Ge(Li) detector was used for the non-destructive
determination, and a single comparator method using Co as flux monitor was applied. 相似文献
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M. Attas 《Journal of Radioanalytical and Nuclear Chemistry》1988,124(2):331-340
This paper discusses the advantages of stable-element tags over radioactive ones in studying complex systems outside the laboratory, and illustrates three applications. These are collaborative investigations of atmospheric transport of dust, seabed movement of sand, and long-term survival rates of freshwater fish. All use lanthanide tags, with analysis by instrumental neutron activation. The importance of a high-throughput, inexpensive analytical method is stressed. 相似文献