共查询到19条相似文献,搜索用时 147 毫秒
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冠醚在Rb和Re中子活化分析中的应用研究 总被引:2,自引:0,他引:2
研究了用18-冠-6(18C6)和苯并15-冠(B15C5)的硝基苯溶液分别从给定pH范围的苦味酸水溶液或KOH溶液中定量萃取Rb和Re,同时研究了影响定量萃取的各种因素以及定量反萃的实验条件,用斜率确定冠醚与金属离子在溶液中生成2:1配合物,冠醚的选择性定量溶液萃取已较好地诮于中子活化分析岩石中微量Rb和Re。 相似文献
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研究了二环己基18 冠6(DCH18C6)-正辛醇从硝酸溶液和模拟高放废液中镅、钚、铀的萃取。考察了酸度和模拟高放废液(HLLW)的稀释倍数对萃取分配比的影响。研究结果表明,在低硝酸浓度和较大稀释倍数情况下,DCH18C6 对镅、钚、铀的萃取分配比都比较小,并随着水相硝酸浓度的增大而增大,随着模拟高放废液稀释倍数的增大而减小;提高萃取剂浓度会增大四价钚的萃取。 相似文献
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二环乙基18冠6从硝酸溶液和模拟高放废液中萃取镅,钚,铀?… 总被引:1,自引:0,他引:1
研究了二环乙基18冠6(DCH18C6)-正辛醇从硝酸溶液和模拟高放废液中镅、钚、铀的萃取。考察了酸度和模拟高放废液(HLLW)的稀释倍数对萃取分配比的影响。研究结果表明,在低硝酸浓度和较大稀释倍数情况下,DCH18C6对 、钚、铀的萃取分配比都比较小,并随着水相硝酸浓度的增大而增大,随着模拟高放废液稀释倍数的增大而减小;提高萃取剂浓度会增大四价钚的萃取。 相似文献
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用锶的天然稳定核素代替^90Sr,用二环己基-18-冠-6(DCH18C6)-正辛醇溶液作萃取剂对经过TRPO流程去除锕系元素之后的模拟高放废液进行串级实验,结果表明,采用10级萃取,2级洗涤,4级反萃,锶的去除率可大于98.7%,并给出了Sr,K,Mo及硝酸等在各级中的浓度剖面及各物流中的相对分布。 相似文献
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用溶剂萃取法测定了二环己基-18-冠-6(DCH18C6)在硝酸和模拟高放废液(HLLW)中的溶解度。实验结果表明,DCH18C6在水溶液中的溶解度不仅与溶液的酸度、含盐量有关,而且还与冠醚的形态有关。 相似文献
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冠醚萃取法从高放废液中去除锶─—工艺流程的研究 总被引:1,自引:0,他引:1
报道了用二环己基18冠6(DC18C6)-正辛醇萃取法从模拟高放废液中去除锶的研究。从高放废液中去除半衰期较长的90Sr,对于高放废液安全处置有着重要意义。系统地研究了DC18C6-正辛醇对Sr2+以及废液中其它阳离子Na+、K+、Cs+、Ni2+、Fe3+、Al3+、Mo(Ⅵ)的萃取性能。结果表明,DC18C6对Sr2+有着良好的萃取选择性,除K+和Mo(Ⅵ)等个别离子外,其它阳离子几乎都不被萃取。在此基础上,建立了用DC18C6-正辛醇从高放浓缩废液中去除锶的工艺流程,并进行了模拟料液的串级实验。经过三级萃取,一级洗涤,四级反萃后,锶的去除率接近99%,产品中锶的重量百分比为76%(原始料液中为0.6%)。该流程具有简单、高去除率、高选择性、适用料液酸度范围较宽等优点,可望用于从我国高放浓缩废液中去除或回收锶。 相似文献
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研究了二环己基18冠6(DC18C6)从硝酸介质中对锶的萃取,选用了正辛醇和第二辛醇作为稀释剂,研究了DC18C6-正辛醇(和第二辛醇)两种萃取体系对锶和硝酸的萃取,同时考察了水相中主要阳离子Fe3+、Al3+、Na+对锶萃取的影响。结果表明,Fe3+和Al3+对锶的萃取都起着盐析作用,Na+在低酸时起盐析作用,而在高酸时起竞争作用。用高放模拟料液进行的实验表明:这两种体系对锶具有较高的萃取能力,并且对其它阳离子有很高的分离系数。反萃实验表明可以用纯水或稀酸从有机相中反萃钢,二次反萃的总反萃率达到98%以上。根据提出的流程,冠醚萃取法有可能用于从中等酸度(0.5-1.0mol/L)的高放废液中去除锶。 相似文献
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冠醚萃取模拟高放废液中Sr^2+,Cs^+的研究 总被引:2,自引:0,他引:2
用同位素踪法研究冠醚对模拟高放废液中Sr^2+,Cs^+的提取,0.01mol/l二环己基-18-冠-6在CHCl2CHCl2和CHCl3中对Sr^2+的一次萃取率在90%以上,二苯并-21-冠-7-磷钼酸-硝基苯体系对Cs^+的萃取效果较好。 相似文献
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研究了在硝酸介质中二环已基18冠6-辛醇-[2]对锶的萃取。结果表明,这种萃取体系对锶具有良好的萃取性能。同时还研究了水相硝酸浓度、平衡时间及锶浓度对萃取的影响。该萃取体系具有较快的反应动力学,锶浓度对萃取没有很大的影响。体系具有良好的反萃性能,可用去离子水作为反萃剂。从模拟高放废液中对锶和其它主要阳离子的萃取分离表明,该体系不仅对锶具有很好的萃取性能,而且对其它阳离子也具有很好的分离性能。 相似文献
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应用化学光谱法分析测定了UF4中的18种微量杂质元素Li、Na、Al、Mg、K、Ca、Mn、Fe、Cu、Cr、Zr、Ti、Mo、V、P、Ni、Ba、W。测定的18种杂质的质量分数范围为3.28×10-10-1.31×10-6;精密度<20%;回收率96.1%-111%。 相似文献
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《核技术(英文版)》2016,(6):182-189
A facility and method for109 Cd radionuclide-induced energy-dispersive X-ray fluorescent(EDXRF) were developed to determine the Fe,Zn,Br,Rb,and Sr concentrations in the specimens of human prostatic fluid.Specimens of expressed prostatic fluid were obtained from 51 men(mean age 51 years,range 18–82 years) with apparently normal prostates using standard rectal massage procedure.Mean values(M ± SEL) for concentration of trace elements(mg L~(-1)) in human prostate fluid were:Fe 9.04 ±1.21,Zn 573 ± 35,Br 3.58 ± 0.59,Rb 1.10 ± 0.08,and Sr B 0.76.It was shown that the results of trace element analysis in the micro-samples(20 l L) are sufficiently representative for assessment of the Fe,Zn,Br,and Rb concentration in the prostate fluid.The facility for109 Cd radionuclide-induced EDXRF is comparatively compact and can be located in close proximity to the site of carrying out the massage procedure.The means of Zn and Rb concentration obtained for prostate fluid agree well with median of reported means.For the first time,the Fe and Br concentrations,as well as the upper limit of the Sr concentration,were determined in the human prostate fluid. 相似文献
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Energy pooling in the Na-Rb vapor mixture has been investigated.While some kind of buffer gas is introduced into the cell the peculiar features appear.The buffer gas enhances the energy transfer betwwen Na(3P) and Rb(5S),which can be detected through the effects induced on the highly excited states populated by the Na(3P)/Rb(5P) and Rb(5P)/Rb(5P) collisions. 相似文献
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t—BAMBP萃取色谱法分离铷,铯的研究 总被引:5,自引:0,他引:5
对t B A M B P萃取色谱法分离铷、铯进行了研究。采用萃取色谱柱实现了铷、铯的完全分离。建立了简便、高效的铷、铯放化分离流程,对铯的去污系数大于 106,铷的回收率大于 80% 。 相似文献
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《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》1988,35(2):167-172
The movement of K, Ca, Fe, Br and Rb in the urine of Rb-treated rats is investigated by means of PIXE (particle induced X-ray emission) measurements. The excreted amount of Rb per day in urine becomes maximum 1 or 2 days after intraperitoneal injection and then exponentially decreases with a biological half time of 6.60 ± 1.58 days. The integrated amount of excreted Rb in urine over 14 days was 40–50% of the injected one, which is nearly one order of magnitude larger than the previous result obtained by the measurement on Rb-ingested rats. No outstanding time dependencies of the excretion amount per day are found for other elements. Relations between the excretion amounts per day for Rb and those for other elements are less evident. 相似文献
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Brain trace elements and aging 总被引:1,自引:0,他引:1
Geert Hebbrecht Willy Maenhaut Jacques De Reuck 《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》1999,150(1-4):208-213
Degenerative mechanisms involved in the aging process of the brain are to a certain extent counteracted by repair mechanisms. In both degenerative and recovery processes, trace elements are involved. The present study focused on the role of two minor (i.e., K and Ca) and six trace elements (i.e., Mn, Fe, Cu, Zn, Se and Rb) in the aging process. The elements were determined by PIXE in cerebral cortex and white matter, basal ganglia, brainstem and cerebellar cortex of 18 postmortem human brains, from persons without a history of neurologic or psychiatric disease who deceased between the age of 7 and 79. This age range allowed us to study the relationship between elemental concentrations and age. The most prominent findings were a concentration decrease for K and Rb and a concentration increase for the elements Ca, Fe, Zn and Se. The study supports recent findings that Ca and Fe are involved in brain degenerative processes initiated by oxygen free radicals, whereas Zn and Se are involved in immunological reactions counteracting the aging process. 相似文献
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For measuring the decay data of ^91Sr, it is necessary that the radiochemical pure ^91Sr is firstly prepared. Based on the analysis of the correlative decay chains shows in Fig.l, twice delay separation method is adopted to prepare radiochemical pure ^91Sr. In this method ^235U target is irradiated for short time, and delayed for about l rain to allow ^92Rb and ^93Rb completely decay to ^92Sr and ^93Sr, then Rb is quickly separated; Delaying for about 10 min to allow the ^91Rb decaies to ^91Sr, and then ^91Sr is separated and purified from other impurities. 相似文献