共查询到20条相似文献，搜索用时 265 毫秒
1.
用全燃烧法一次曝光发射光谱同时测定了大洋深海沉积物和多金属结核中多个微量元素；重点考察了缓冲剂和分析条件的优化，解决了大洋试样吸湿性强、光谱相互干扰多及激发时易喷溅等问题。所测项目有Ｂ、Ｂａ、Ｂｅ、Ｃｏ、Ｃｒ、Ｃｕ、Ｇａ、Ｌａ、Ｍｏ、Ｎｂ、Ｎｉ、Ｐｂ、Ｓｃ、Ｓｒ、Ｔｌ、Ｖ、Ｙ、Ｙｂ、Ｚｎ和Ｚｒ共２０项。用国家一级深海标准物质对方法进行检验，所得结果与标准值相符，相对标准偏差（ｎ＝３０）大多在１０％左右。方法用于新研制的大洋标准物质ＧＳＭＳ＿２，３和ＧＳＰＮ＿２，３定值分析，结果与初定值符合。 相似文献
2.
5—Br—PADAP分光光度法测定多金属结核中的铌 总被引：4，自引：1，他引：4
报道了用单宁＿硅酸钠＿动物胶沉淀分离多金属结核中的Ｍｎ、Ｃｏ、Ｆｅ、Ｓｉ等干扰组分，然后用５＿Ｂｒ＿ＰＡＤＡＰ分光光度法在水相中测定Ｎｂ；讨论和解决了Ｎｂ的结果偏低问题。方法应用于新研制的大洋多金属结核ＧＳＰＮ＿２和ＧＳＰＮ＿３中Ｎｂ的定值测定，结果与初定值相符，其ＲＳＤ（ｎ＝７）分别为２０１％和３２２％。 相似文献
3.
深海沉积物中化合水的测定 总被引：1，自引：2，他引：1
针对用双球管重量法测定化合水（Ｈ２Ｏ＋）时试样中的Ｃｌ－对测定严重干扰，考察了用浸洗样品除Ｃｌ－以及校正双球管中冷凝水（Ｈ２Ｏ±）中Ｃｌ－的两种消除Ｃｌ－干扰的方法。实验证明，两种方法均可行，但后者更具有实用性，测定结果准确、精密度较好。所拟方法对新研制的ＧＳＭＳ＿２和ＧＳＭＳ＿３两个深海沉积物标准物质的化合水进行测定，结果与初定值相符。 相似文献
4.
中子活化分析大洋多金属结核标准物质的研究 总被引：2，自引：2，他引：2
采用中子活化分析相对＿Ｋ０法对研制的两个深海多金属结核标准物质ＧＳＰＮ＿２和ＧＳＰＮ＿３中的２６种主量和微量元素进行了定值测定，所得结果与初定值符合；对中子辐照自屏蔽效应进行了实验测定和理论计算，结果显示了很好的一致性；同时还对这两个多金属结核标准物中的Ａｓ、Ｂａ、Ｃｅ、Ｃｏ、Ｅｕ、Ｆｅ、Ｌａ、Ｌｕ、Ｍｎ、Ｍｏ、Ｎａ、Ｓｂ、Ｓｍ、Ｓｃ、Ｔｈ、Ｙｂ和Ｚｎ的取样量与取样误差关系进行了研究。结果表明，在ＧＳＰＮ＿２和ＧＳＰＮ＿３试样中分别有８种和１１种元素，在取样量１０ｍｇ时其取样误差小于１％。 相似文献
5.
多金属结核中二氧化锰的测定 总被引：1，自引：0，他引：1
用过量的含有Ｈ２ＳＯ４的（ＮＨ４）２Ｆｅ（ＳＯ４）２溶液分解多金属结核的同时，还原了试样中的ＭｎＯ２，然后以Ｋ２Ｃｒ２Ｏ７标准溶液滴定测定了多金属结核中的ＭｎＯ２。就样品分解过程中的加热温度和时间对测定结果的影响及标准溶液的标定等问题进行了讨论，经多次测定，方法重现性好。应用此方法为新研制的多金属结核标准物质提供了ＭｎＯ２的定值数据，其结果与初定值相符，无剔除值，精密度（ＲＳＤ，ｎ＝８）小于０６％。 相似文献
6.
大洋多金属结核和深海沉积物标准物质中铂族元素的中子活化分析 总被引：7，自引：2，他引：5
采用镍锍试金预富集中子活化分析方法,测定了大洋多金属结核标准物质ＧＳＰＮ２、ＧＳＰＮ３和深海沉积物标准物质ＧＳＭＳ２、ＧＳＭＳ３中的铂族元素;根据大洋样品成分特征,对常规的镍锍试金配方和熔炼条件作了改善;计算了活化分析中的铂族元素干扰核反应,校正了Ａｕ对Ｐｔ的二级干扰;选用羰基化镍粉配料,降低了铂族元素空白值。用国家一级标准物质ＧＢＷ０７１０２作了对照分析,结果与标准值相符。 相似文献
7.
等离子体发射光谱法同时测定大洋富钴结壳中硅锰铁钙镁铝钛 总被引：3，自引：0，他引：3
大洋富钴结壳试样经ＨＣｌ＋ＨＮＯ３＋ＨＦ溶解,在０．２ｍｏｌ／ＬＨＦ和０．１３ｍｏｌ／ＬＨ３ＢＯ３介质中,用感耦等离子发射光谱法同时测定Ｓｉ、Ｍｎ、Ｆｅ、Ｃａ、Ｍｇ、Ａｌ、Ｔｉ元素的含量。方法经国家标准物质ＧＢＷ０７２４９大洋多金属结核验证,其结果与标准值相符,精密度ＲＳＤ〈３．２％（ｎ＝６）;已应用于太平洋富钴结壳中多元素分析。 相似文献
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9.
大洋多金属结核经碱熔分解，氢氧化物沉淀和阳离子交换树脂富集稀土元素后，主元素（也是富线光谱元素）Ｍｎ和Ｆｅ的残留量（ｗＢ）仅０１％左右，不干扰ＩＣＰ＿ＡＥＳ法测定稀土元素。方法的检出限为１μｇ／Ｌ（Ｌｕ）～７５μｇ／Ｌ（Ｎｄ），ＲＳＤ（ｎ＝１１）小于５％。采用此法测定了国家一级多金属结核标准物质中１５个稀土元素，结果与标准值相符；同时为东太平洋多金属结核待定值标准物质提供了１５个稀土元素数据；并对其地球化学特征做了初步探讨 相似文献
10.
二安替比林基—（2—溴）苯基甲烷与铈的显色反应及应用 总被引：4，自引：0，他引：4
合成了二安替比林基＿（２＿溴）苯基甲烷（ＤＡｏＢＭ）。在Ｍｎ（Ⅱ）和吐温＿８０存在下，Ｃｅ（Ⅳ）与ＤＡｏＢＭ反应生成有色化合物，λｍａｘ为４８０ｎｍ，摩尔吸光系数为３１×１０５Ｌ·ｍｏｌ－１·ｃｍ－１。Ｃｅ（Ⅳ）的质量浓度为０００４～０２ｍｇ／Ｌ时符合比尔定律。方法已用于稀土矿石中微量Ｃｅ（Ⅳ）的测定，结果与ＩＣＰ＿ＡＥＳ法相符 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
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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