海洋样品中^231Pa和U,Th同位素的联合分离测定   总被引：1，自引：0，他引：1  

郑爱榕  施文远 《热带海洋》1992,11(1):101-105

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环境样品中铈,钇和钍的测定     

Achil.  M 许孙曲 《海洋技术学报》1990,9(3):72-79

以下介绍海水、孔隙水,悬浮物,沉积物和生物群中Ce、Y和Th 的测定方法。该法包括用Mg(OH)_2和 CaC_2O_4双共沉淀法以便预富集海水和孔隙水中的Ce,Y和Th,同时在敞开容器进行酸溶以使沉积物、悬浮物和生物群溶解。用电感耦合等离子体原子发射光谱法进行测定。在不同步骤用放射示踪剂(~(144)Ce、~(88)Y和~(228)Tn)检验方法的化学效率。获得了生物群和沉积物(水)中的检测极限为 Ce,44ngg~(-1)(0.005ngml~(-1)),Y,0.62ngg~(-1)(0.0003ngml~(-1))和 Th。15ngg~(-1)(0.003ngml~(-1))。给出了从第勒尼安(Tyrrhenian)海收集到的海水、孔隙水、悬浮物、沉积物和生物群样品中 Ce、Y 和 Th 的测定结果。获得了各种海洋环境样品中的 Ce、Y 和Th 的高富集因子和回收率。采用较大数量的样品,以增大富集因子并改善检测极限。  相似文献   

用于轻水堆的钍燃料——核动力燃料循环扩散的前景下降     

张铁岭  仉宝聚 《国外铀金地质》1999,16(1):30-35

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Geochemical Characteristics of the Sandstone—type Uranium Deposits in Northern Sichuan Province     

王旺章  张筑凤 《中国地球化学学报》1995,14(2):152-159

Described in detail in this paper are the geochemical characteristics of the sandstone-type uranium deposits in northern Sichuan Province .Favorable and unfavor-able conditions for the enrichment of uranium are explored on the basis of the elemental abundances and ratios of U,Th and K determined by gamma-ray spectroscopy. Gamma-ray spectroscopic(U, Th and K) and XRF analyses(As, Ba) are helpful to distinguish U-bearing light-colored sandstones from U-barren light-colored ones and red sandstones (red claystone) from light-colored sandstones. Therefore, the favorable target area for prospecting the sandstone-type uranium deposits can be difined in northern Sichuan Province.  相似文献   

地球深部真的贫铀钍吗?——来自秦岭造山带加里东期岩浆岩体锆石铀钍含量的讨论     

伍皓  李小刚  吴晨  夏彧  周恳恳  熊国庆  姚雪婷 《地质论评》2021,67(3):67040008-67040008

为尝试利用锆石来初步探索地球内部铀、钍的丰度，通过搜集秦岭造山带加里东期岩浆岩体锆石U-Th-Pb同位素测年文献，掌握了3件超基性岩、52件基性岩、46件中性岩、90件酸性岩，共计191件样品，6979个（铀含量数据3552个，钍含量数据3427个）锆石定年数据。数据分析指示铀和钍在同一类型岩浆岩锆石中含量均相差悬殊，可在不同类型岩浆岩锆石中富集或亏损，不具有从超基性岩到基性岩到中性岩再到酸性岩总体增加的趋势。在所有样品锆石铀、钍平均值2倍以上的45件高富集样品中的34件呈现“局部长期”分布的特征，表现为：10件在451.0~422.1 Ma期间的以OIB型基性、中基性岩为主的样品约29 Ma时间集中产出在南秦岭大巴山地区，岩浆多来自由HIMU，EMII和EMI三个富集地幔端元组分混合而成的复杂地幔区；24件在495.9~413.6 Ma期间的以I型、S-I型酸性岩为主的样品约82 Ma时间集中产出于北秦岭商丹（商南—丹凤）地区，岩浆可来自地幔、壳幔混合和地壳源区。结合华南金属铀（0价）的发现等前人研究成果初步分析认为，加里东期大巴山和商丹地区可能分别存在地幔柱和大陆型热点，地核中大量铀、钍沿地幔柱和大陆型热点上升致使地幔和地壳局部熔体中铀、钍长期富集，其超高含量可能被熔体中锆石结晶部分记录，这一元素迁移过程可能是两区域产出高锆石铀、钍含量样品和商丹地区生成铀矿的主要原因。支持铀、钍可在地核和地幔柱富集的认识。  相似文献   

Distribution of uranium and thorium in Irtysh River and the upriver wastewater from a rare metal mine impact on it     

Shehong LI Baoshan ZHENG Jianming ZHU Xiaoying YU 《中国地球化学学报》2006,25(B08):43-44

Uranium and Th are important radioactive elements. Most studies were focused on their environmental impact from uranium deposits and mining sites. But other sorts of mines such as rare metals mines are associated highly with uranium and thorium, too. In China, the Irtysh River is the only river that runs into the Arctic Ocean. The famous Koktokay rare metal pegmatite deposit is located in the headwater region of this river and has been exploited for several decades. The waste ore piled along the riverside as long as several kilometers. The wastewater flom the concentrating plant is discharged into the river directly. In addition, uranium and thorium can be leached from the waste ore into the river in the weathering process. So it is necessary to study the uranium and thorium distribution in the branch and trunk streams of the Irtysh River and the wastewater from the mining site impact on it. In this study, the contents of uranium and thorium in water samples from the Irtysh River and rare metal mine wastewater have been detected directly with ICP-MS. Uranium and thorium distribution and geochemical behaviors in the Irtysh River basin have been studied. The environmental uranium and thorium pollution status in the Irtysh River and wastewater from a rare metal mine impact on it have also been evaluated. The study shows that uranium and thorium contents in wastewater from a rare metal mine are as high as 78.311 μg/L and 0.627 μg/L, respectively, so we should also pay attention to the radioactive pollution from the rare metal mine. The average contents of U and Th in the branch streams of the Irtysh River are 0.572 μg/L and 0.015 μg/L, respectively. At the mean time, in the trunk of the Irtysh River, average thorium content is 0.019 μg/L while U is up to 2.234 μg/L, much higher than the average content （0.0309 μg/L） of the world rivers. From upstream to downstream in the trunk of the Irtysh River, thorium content declines gradually due to dilution by other branches and deposition itself.  相似文献   

钍石的新变种——铅钍石     

严春杰  杨光明 《地质科技情报》1997,16(2):29-31

铅钍石是钍石的新变种，属首次发现。其ＰｂＯ含量达９．０４％，由此引起其性质的变化，如比重、硬度、折光率和晶胞参数均小于铀钍石，并可根据红外吸收谱判断铅钍石的变生程度。  相似文献   

电沉积钍同位素α源中^215Po测量方法的研究     

陈英强 《岩矿测试》1996,15(3):173-177

讨论了电沉积钍同位素α源中２１５Ｐｏ测量中存在的问题。证实了２１５Ｐｏ测量结果偏低的主要原因是２２３Ｒａ的逃逸。采用封膜技术使得２１５Ｐｏ的测量方法获得成功  相似文献   

偶氮胂Ⅲ显色-全差示光度法测定岩矿中痕量钍     

王国贤 《铀矿地质》1989,(4)

用7215型全差示光度计,以偶氮胂Ⅲ为显色剂测定了岩矿中痕量钍。该法灵敏度高、选择性佳,可准确测定岩矿中n×10~(-4)％—n×10~(-1)％的钍。  相似文献   

偶氮氯膦Ⅲ双波长分光光度法同时测定铀矿石中钍和铀     

金问龙  姚明霞  殷梓南 《铀矿地质》1988,(1)

本文对偶氮氯膦Ⅲ与钍、铀的显色反应作了研究,提出了三烷基氧膦-G.D.X-301萃取色层分离、偶氮氯膦Ⅲ双波长分光光度法同时测定铀矿石中钍和铀的方法。方法简便,精密度、准确度良好。  相似文献