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1.
化探样品中钽的测定分光光度法   总被引:1,自引:0,他引:1  
武宏  曹学军  武小玲 《新疆地质》2002,20(3):289-289
测定Ta的方法有很多,比如结晶紫法,该法的灵敏度低,检出限达不到化探样品的要求;乙基紫法,灵敏度虽高,但稳定性相当差,不适合成批化探样品的检测.本文采用钽钼酸与丁基罗丹明B在聚乙烯醇存在下形成水溶性缔合物光度法测定化探样品中的Ta[1],其表观摩尔吸光系数为1.39×106 L·mol·cm-1, 灵敏度高,稳定性好,并且在水相中测定,适合化探样品中痕量Ta的测定. 1 实验仪器及试剂 UV─250 (日本岛津); 10 μg穖L-1标准溶液:准确吸取100μg·mL-1 Ta2O5标准储备液(63 g/L酒石酸介质)10.0mL于100 mL容量瓶中,用4 mol· L-1 KOH溶液稀释定…  相似文献   

2.
原子荧光光谱法直接连续测定化探样品中的As Sb Bi Hg   总被引:7,自引:1,他引:6  
研究了还原性介质中原子荧光光谱法直接连续测定化探样品中As、Sb、Bi、Hg的方法。按拟定的条件进行测定,各元素的检出限分别为As2.9×10-9、Sb1.3×10-10、Bi1.8×10-10、Hg5×10-11。应用于区域化探扫面工作中,效果良好。  相似文献   

3.
土壤、水系沉积物中微量银的发射光谱测定方法   总被引:1,自引:0,他引:1  
章淑琴 《贵州地质》2003,20(1):60-62,45
本方法借助卤化反应 ,并加入大比例缓冲剂基体 ,采用 1m光栅发射光谱快速曝光 ,测定并计算结果。分析检出限 0 0 3× 1 0 - 6,经过对地球化学级标样多次测定结果表明 :本方法的精密度与准确度均达到DZ0 1 30 . 6《1∶5和 1∶2 0万化探样品分析质量要求和检查办法》的要求。  相似文献   

4.
醋酸丁酯萃取-无火焰原子吸收法测定化探样品中痕量金   总被引:3,自引:0,他引:3  
刘菊琴  杨永理  韦山桃 《矿产与地质》2003,17(3):261-262,F003
在KBr存在下,用小体积醋酸丁酯萃取金后,用无火焰原子吸收法测定化探样品中痕量金的分析方法较化学富集光谱法具灵敏度高(检出下限可达0.05×10-9)、精度好、简便快速、成本低等优点.通过批量化探样的检验,证明该方法足已满足化探样品对金的测定要求.  相似文献   

5.
岩石化探样品中溴的气相色谱法测定   总被引:1,自引:0,他引:1  
气相色谱法测定谷物、水中的溴已有报道,地质样品中微量溴的气相色谱法测定国内尚未见到报道。本对岩石化探样品中溴的气相色谱测定,重点研究了氯离子的干扰及消除。在本实验条件下,方法检出限(3S)为0.11×10^-6,溴含量在0.3~O.8×10^-6时相对标准偏差均≤17%,本法测定了GSD和GSS标样中的溴,误差RE<±17%。  相似文献   

6.
化探样中的痕量银和镉(0.0xppm)不经分离直接用无火焰原子吸收法测定银和镉是困难的。宫本益夫曾用dowex 1×8阴离子树脂分离和富集电解铜中的银;辽宁地质局中心实验室曾用717阴离子树脂分离和富集化探样中的镉,F.Bea.Barredo和c.Polo polo曾用dowex1×8阴离子树  相似文献   

7.
李风  席永婷 《岩矿测试》2008,27(6):477-478
针对野外现场分析的要求,选择微珠比色技术用于江河天然水样和化探样品中铁的分析。以向红菲啰啉为显色剂,硫代硫酸钠掩蔽铜的干扰,方法摩尔吸光系数为1×105L.mol-1.cm-1,精密度(RSD,n=10)为2.5%,适用于0.001μg/g以上的铁的测定。方法用于江河天然水样和化探样品中铁的测定,结果与分光光度法相符。方法在拟定的过程中注意了降低环境污染、降低成本和提高方法的可操作性。建立的方法干扰少,选择性好,对实验环境条件要求不高,满足野外现场分析应用。对于天然水可直接测定;但一般的化探样品由于铁含量较高,需要稀释后再测定。  相似文献   

8.
薛光 《物探与化探》2003,27(5):369-370
提出了一种化探找金、银的新方法,该法采用一种混合浸取剂,以螯合吸附剂对采集到的化探次生晕样品进行偏提取.对偏提取的金、银含量,利用液珠萃取比色法进行金、银含量测定,从而达到化探直接找金、银的目的.该法克服了化探找金工作中的“粒金效应”.该设备简单、易操作.  相似文献   

9.
化探样中的痕量银和镉(0.0xppm)不经分离直接用无火焰原子吸收法测定银和镉是困难的。宫本益夫曾用dowex1×8阴离子树脂分离和富集电解铜中的银;辽宁地质局中心实验室曾用717阴离子树脂分离和宙集化探样中的镉;F.Bea.Barredo和C.Polo polo曾用dowex1×8阴离子树脂分离硅酸盐岩石中的金、银和镉后,用无火焰原子吸收法测定。本工作参考了他人的工作,结合我们的工作情况,确定了实验条件。其绝对灵敏度银为1.5×10~(-11)克,镉为1×10~(-11)克。  相似文献   

10.
近三年来,作者参与了化探找金的方法试验工作,本着“总结、提高”的精神,写成此文,以供同志们参考。 文中介绍了四川四种类型金矿的特征元素组合和它们的分散流异常特征;化探找金方法试验结果;进而对化探找金的工作方法提出了一些粗浅看法。 所采样品用发射光谱半定量分析方法测定Cu、Ag、Pb、Zn、Ni、Cr、Co、V、Ti、Mn、Mo、B、Ba、Bi、Sn,用化学光谱法测定Au,结晶紫比色法测定Sb,斑点  相似文献   

11.
Pant-y-ffynnon Quarry in South Wales yielded a rich cache of fossils in the early 1950s, including articulated specimens of new species (the small sauropodomorph dinosaur Pantydraco caducus and the crocodylomorph Terrestrisuchus gracilis), but no substantial study of the wider fauna of the Pant-y-ffynnon fissure systems has been published. Here, our overview of existing specimens, a few described but mostly undescribed, as well as freshly processed material, provides a comprehensive picture of the Pant-y-ffynnon palaeo-island of the Late Triassic. This was an island with a relatively impoverished fauna dominated by small clevosaurs (rhynchocephalians), including a new species, Clevosaurus cambrica, described here from a partially articulated specimen and isolated bones. The new species has a dental morphology that is intermediate between the Late Triassic Clevosaurus hudsoni, from Cromhall Quarry to the east, and the younger C. convallis from Pant Quarry to the west, suggesting adaptive radiation of clevosaurs in the palaeo-archipelago. The larger reptiles on the palaeo-island do not exceed 1.5?m in length, including a small carnivorous crocodylomorph, Terrestrisuchus, and a possible example of insular dwarfism in the basal dinosaur Pantydraco.  相似文献   

12.
Robert L. Linnen   《Lithos》2005,80(1-4):267-280
The solubilities of columbite, tantalite, wolframite, rutile, zircon and hafnon were determined as a function of the water contents in peralkaline and subaluminous granite melts. All experiments were conducted at 1035 °C and 2 kbar and the water contents of the melts ranged from nominally dry to approximately 6 wt.% H2O. Accessory phase solubilities are not affected by the water content of the peralkaline melt. By contrast, solubilities are affected by the water content of the subaluminous melt, where the solubilities of all the accessory phases examined increase with the water content of the melt, up to 2 wt.% H2O. At higher water contents, solubilities are nearly constant. It can be concluded that water is not an important control of accessory phase solubility, although the water content will affect diffusivities of components in the melt, thus whether or not accessory phases will be present as restite material. The solubility behaviour in the subaluminous and peralkaline melts supports previous spectroscopic studies, which have observed differences in the coordination of high field strength elements in dry vs. wet subaluminous granitic glasses, but not for peralkaline granitic glasses. Lastly, the fact that wolframite solubility increases with increasing water content in the subaluminous melt suggests that tungsten dissolved as a hexavalent species.  相似文献   

13.
Lithostratigraphy, physicochemical stratigraphy, biostratigraphy, and geochronology of the 77–70 Ma old series bracketing the Campanian–Maastrichtian boundary have been investigated by 70 experts. For the first time, direct relationships between macro- and microfossils have been established, as well as direct and indirect relationships between chemo-physical and biostratigraphical tools. A combination of criteria for selecting the boundary level, duration estimates, uncertainties on durations and on the location of biohorizons have been considered; new chronostratigraphic units are proposed. The geological site at Tercis is accepted by the Commission on Stratigraphy as the international reference for the stratigraphy of the studied interval. To cite this article: G.S. Odin, C. R. Geoscience 334 (2002) 409–414.  相似文献   

14.
正The Kuqa depression deposited thick rock salt,which has a lower density than surrounding rocks.When salt bodies form a certain scale,obvious negative gravity anomalies can be detected in the surface.Therefore,gravitational method can quickly obtain the shape,plane distribution of deep-seated salt bodies and overall tectonic morphology of the basin.  相似文献   

15.
正1 Introduction The Pingluoba brine,which characterized as high concentration with sodium,potassium,boron,lithium,and rubidium,possess great development value.The main composition of the brine can be summarized to the  相似文献   

16.
正1 Introduction In the present paper,MgCl2·6H2O,FeCl3·6H2O,and CeCl3·6H2O were used as raw materials in the precipitationhydrothermal method to synthesize MgF eC e hydrotalcite.The effects of the Fe:Ce molar ratio on the composition,crystal structure,and thermal stability of hydrotalcite are examined.Energy-dispersive X-ray spectroscopy(EDS),X-  相似文献   

17.
正1 Introduction Crystallization is one of important unit operations in the chemical production process,which requires not only the crystal product with high purity and yield,but also the available particle size of the crystal products to ensure product quality.Crystallization process is affected by  相似文献   

18.
正Dear Authors and Readers:First of all,on behalf of the new Editorial Board,I would like to express our sincere appreciation for your continuing support of our journal.This journal,founded in 1922,is the oldest geological journal in China.As the flagship journal of the Geological Society of China,it has become more and more influential in earth sciences in China and beyond.The journal is now indexed by SCI,CA and more than 20 other databases,with an impact  相似文献   

19.
正20141283 Bai Daoyuan(Hunan Institute of Geological Survey,Changsha 410016,China);Zhong Xiang Nature,Origin and Tectonic Setting of Jinzhou Basin in the South Segment of Xuefeng Orogen(Geology in China,ISSN1000-3657,CN11-1167/P,40(4),2013,p.1079-1091,10 illus.,47 refs.)Key words:foreland basins,strike-slip faults,Hunan Province  相似文献   

20.
正20142093Chen Daohua(Guangzhou Marine Geological Survey,Guangzhou 510075,China);Diao Shaobo The Latest Progress of Geological Marine Testing Technology in China(Rock and Mineral Analysis,ISSN0254-5357,CN11-2131/TD,32(6),2013,p.850-859,105refs.)Key words:chemical analysis,China  相似文献   

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