共查询到20条相似文献，搜索用时 453 毫秒
1.
研究了三烷基氧膦（ＴＲＰＯ）纤维素色层分离富集痕量元素Ｗ、Ｍｏ和Ｓｎ的条件，根据吸附与洗脱实验中的现象初步探讨了ＴＲＰＯ与Ｗ、Ｍｏ、Ｓｎ的反应机理。以Ｒｈ为内标采用感耦等离子体质谱法进行测定。标准加入回收率为９８％～１０１％；Ｗ、Ｍｏ、Ｓｎ的测定下限分别为０．０２、０．０１、０．１μｈ／ｇ；重复取样测定的ＲＳＤ（ｎ＝１５）均小于１０％。经对地球化学标准物质分析，结果与推荐值相符。 相似文献
2.
研究了三烷基氧膦纤维素色层分离富集痕量元素Ｗ、Ｍｏ和Ｓｎ的条件，根据吸附与洗脱实验中的现象初步探讨了ＴＲＰＯ与Ｗ、Ｍｏ，Ｓｎ的反应机理。以Ｒｈ为内标采用感耦等离子体质谱法进行测定，标准加入回收率为９８％－１０１％；Ｗ、Ｍｏ，Ｓｎ的测定下限分别为０．０２、０．０１、０．１μｇ／ｇ；重复取样测定的ＲＳＤ均小于１０％。经对地球化学标准物质分析，结果与推荐值相符。 相似文献
3.
发展了一种可在野外快速测定０．０１０—５０μｇ／ｇ银量的新方法。此法由两个各自独立而又配套的部分组成。一是直接测定０．２５—５０μｇ／ｇ银量的Ａｇ－ＴＭＫ－ＳＤＳ三元络合物光导比色测定法；二是测定０．０１０—０．２５μｇ／ｇ银量的巯基棉分离富集微珠析出比色法。可在同一份试液中依次完成。前者检出限为０．００６μｇ／ｍｌ（Ｋ＝３）；测定铜、铅和锌矿石标样ＧＳＯ－Ｃｕ－１（含银３．８７μｇ／ｇ）、ＧＳＯ－Ｐｈ－１（含银１４．７μｇ／ｇ）和ＧＳＯ－Ｚｎ－１（含银１３．５μｇ／ｇ）中的银，ＲＤＳ（ｎ＝１１）分别为１．６％、３．７％和３．４％；后法可检出５ｎｇ／ｇ银；测定地球化学标样ＧＳＤ－３（含银０．５９μｇ／ｇ）中的银，ＲＳＤ（ｎ＝１１）为６．ｔ％。方法较为简便、快速、准确和灵敏。用光导比色计测定，结果准确度、精度均有较大改善，且与室内原子吸收法相当。故所定方法具有广阔的应用前景。 相似文献
4.
5.
有机螯合沉淀剂富集－感耦等离子体质谱法测定地球化学样品中痕量元素 总被引：1，自引：0，他引：1
报道了用吡咯烷二硫代氨基甲酸铵（ＡＰＤＣ）有机螯合沉淀剂沉淀富集后，等离子体质谱法测定地球化学样品中２６个痕量元素的方法。研究了ＡＰＤＣ定量沉淀待测金属离子的条件，分别在ｐＨ２和ｐＨ７时使２６个元素富集，回收率在９４％～１０５％；样品测定下限为０．０１～０．４μｇ／ｇ；方法的ＲＳＤ（ｎ＝１０）为３％～１３％。经几种地球化学标准物质验证，结果与推荐值相符。 相似文献
6.
催化还原褪色光度法测定痕量锡 总被引：7，自引：1，他引：6
痕量锡在０．０４ｍｏｌ／ＬＨ３ＰＯ４介质中对ＮａＨ２ＰＯ２还原罗丹明Ｂ褪色反应有催化作用,催化程度与Ｓｎ量、温度和加热时间线性相关。基于此,建立了痕量锡的动力学光度分析方法。方法检出限为０．０３４μｇ／Ｌ,线性范围为０～２０μｇ／Ｌ,结合磷酸三丁酯色谱分离,实现了地质样品中痕量Ｓｎ的测定。方法经国家地质标准物质分析验证,结果与标准值相符。对于ｗ（Ｓｎ）为１０－６水平的试样其ＲＳＤ（ｎ＝６）＜６．５％。 相似文献
7.
研究了用感耦等离子体发射光谱（ＩＣＰ－ＡＥＳ）测定纯氧化镧中Ｃｅ，Ｐｒ，Ｎｄ，Ｓｍ，Ｙ，Ｆｅ，Ａｌ，Ｃａ，Ｍｇ和Ｓｉ１０个杂质元素的方法。考察了基体镧的光谱干扰，共存元素间光谱干扰及校正方法，方法检出限为０．０００５－０．０３９μｇ／ｍｌ；标准加入量１μｇ／ｍｌ时，回收率为９５％－１０６％；１０μｇ／ｍｌ的标准溶液，测定１０次，ＲＳＤ为０．２４％－１．０１％。方法简单，快速，不震分离富集，适用于氧 相似文献
8.
碱性体系在线氢化物发生原子荧光光谱法测定铜矿石中痕量砷锑铋 总被引：10，自引：4，他引：6
建立了一个碱性体系在线氢化物发生原子荧光光谱法测定铜矿石中痕量砷、锑、铋的分析方法。设计了在线氢化物发生流路及操作程序。选择了碱性体系氢化物发生的各项最佳条件,避免了Ｃｕ、Ｆｅ等大量基体元素的干扰。方法检出限为Ａｓ０．６μｇ／Ｌ,Ｓｂ０．４μｇ／Ｌ,Ｂｉ０．９μｇ／Ｌ,Ａｓ、Ｓｂ、Ｂｉ的工作曲线均在０～４００μｇ／Ｌ内呈良好的线性,经铜矿石国家一级标准物质分析验证,砷锑铋的测定结果与标准值吻合,相对标准偏差（ＲＳＤ,ｎ＝５）在４．２％～８．８％。 相似文献
9.
报道了用吡咯烷二硫化氨基甲酸铵（ＡＰＤＣ）有机螯合沉淀剂沉淀富集后，等离子体质谱法测定化学样品中２６个痕量元素的方法，研究了ＡＰＤＣ定量沉淀待测金属离子的条件，分别在ＰＨ２和ＰＨ７时使２６个元素富集，回收率在９４％～１０５％。样品测定了下限为０．０１～０．４μｇ／ｇ；方法的ＲＳＤ（ｎ＝１０）为３％～１３％。经几种地球化学标准物质验证，结果与推荐值相符。 相似文献
10.
经萃取分离富集后，在ｐＨ２．６的苯二甲酸氢钾ＨＣｌ介质中，用电流氧化溶出计时电位法测定地质物料中痕量Ｉｎ。方法检出限为０．０１μｇ／ｇ，标样中Ｉｎ的含量为０．１０μｇ／ｇ时的方法精密度（ＲＳＤ，ｎ＝１１）为８．７６％，加标回收率为９８％～１０５％。应用此方法测定了国家一级地球化学标准参考物质（ＧＳＲ１～６，ＧＳＳ１～８，ＧＳＤ９～１２）中的痕量Ｉｎ，获得了较为满意的测定结果 相似文献
11.
Emily Keeble David I. Whiteside Michael J. Benton 《Proceedings of the Geologists' Association. Geologists' Association》2018,129(2):99-119
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.
Gilles Serge Odin 《Comptes Rendus Geoscience》2002,334(6):409-414
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
13.
The effect of water on accessory phase solubility in subaluminous and peralkaline granitic melts 总被引：4，自引：0，他引：4
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
14.
Emmanuel Skourtsos Daniel Vachard Alexandra Zambetakis-Lekkas Rossana Martini Louisette Zaninetti 《Comptes Rendus Geoscience》2002,334(12):925-931
Some olistolites reworked in a Tertiary flysch of Mount Parnon (Peloponnesus, Greece) exhibit a Late Permian assemblage, dominated by Paradunbarula (Shindella) shindensis, Hemigordiopsis cf. luquensis and Colaniella aff. minima. This association corresponds to the Late Wuchiapingian (=Late Dzhulfian), a substage whose algae and foraminifera are generally little known. Contemporaneous limestones crop out in the middle part of the Episkopi Formation in Hydra, but they are rather commonly reworked in Mesozoic and Cainozoic sequences. The palaeobiogeographical affinities shared by the foraminiferal markers of Greece, southeastern Pamir, and southern China, are very strong (up to the specific level), and are congruent with the Pangea B reconstructions. To cite this article: E. Skourtsos et al., C. R. Geoscience 334 (2002) 925–931. 相似文献
15.
正20141596 Liu Yunhuan(School of Earth Sciences and Resources,Chang’an University,Xi’an 710054,China);Shao Tiequan Early Cambrian Quadrapyrgites Fossils of Xixiang Boita in Southern Shaanxi Province(Journal of Earth Sciences and Environment,ISSN1672-6561,CN61-1423/P,35(3),2013,p.39-43,3 illus.,20 refs.) 相似文献
16.
正20141719 Chen Zhijun(State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Wuhan 430074,China);Chen Jianguo Automated Batch Mapping Solution for Serial Maps:A Case Study of Exploration Geochemistry Maps(Journal of Geology,ISSN1674-3636,CN32-1796/P,37(3),2013,p.456-464,2 illus.,2 tables,10 refs.) 相似文献
17.
正20140962 Chen Fenning(Xi’an Institute of Geology and Mineral Resources,Xi’an710054,China);Chen Ruiming Late Miocene-Early Pleistocene Ostracoda Fauna of Gyirong Basin,Southern Tibet(Acta Geologica Sinica,ISSN0001-5717,CN11-1951/P,87(6),2013,p.872-886,6illus.,56refs.) 相似文献
18.
正1.IGNEOUS PETROLOGY20142008Cai Jinhui(Wuhan Center,China Geological Survey,Wuhan 430205,China);Liu Wei Zircon U-Pb Geochronology and Mineralization Significance of Granodiorites from Fuzichong Pb-Zn Deposit,Guangxi,South China(Geology and Mineral Resources of South China,ISSN1007-3701,CN42-1417/P,29(4),2013,p.271-281,7illus., 相似文献
19.
正20141205Cheng Weiming(State Key Laboratory of Resources and Environmental Information System,Institute of Geographic Sciences and Natural Resources Research,CAS,Beijing 100101,China);Xia Yao Regional Hazard Assessment of Disaster Environment for Debris Flows:Taking Jundu Mountain,Beijing as an 相似文献
20.
正20141266Fan Chaoyan(Guangdong Provincial Key Laboratory of Mineral Resources and Geological Processes,Guangzhou 510275,China);Wang Zhenghai On Error Analysis and Correction Method of Measured Strata Section with Wire Projection Method(Journal of 相似文献