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地质样品中微量金银的在线分离富集方法 总被引:4,自引:0,他引:4
提出用VS-Ⅱ型强碱性阴离子交换纤维定量富集,硫脲解脱,流劝注射在线分离富集-火焰有收光谱法测定地质样品中痕量金银的分析方法。该方法检出限低,金为1.4μg/mL,银为0.35μg/mL,相对标准偏差小于2%,采样频率为120次/h,用于地质样品中痕量金银的直接测定,结果令人满意。 相似文献
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流动注射液—液萃取分光光度法测定地质样品中的碘 总被引:2,自引:0,他引:2
研究了流动注射在线液-液萃取技术,设计了一种既适用于水相又适用于有机相光度分析的流通地,进行了地质样品中痕量碘在线萃取及光度测定,方法的富集因子50,富集效率25,测定样品速度为30样次/h,检出限为3.8μg/L的I^-,其RSD为1.7%,方法用于水系沉积物和土壤标样中碘的验证,结果与标准值吻合。 相似文献
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流动注射—二苯硫脲纤维素在线富集——火焰原子吸收法测定地质样品?… 总被引:4,自引:0,他引:4
本研究采用自行合成的二苯硫脲纤维素作为在线富集介质,流动注射与原子吸收法联用快速测定地质样品中痕量金,在本法选定条件下,测定速度为30样/h,测定灵敏度为0.31μg/ml(1%吸收),RSD为2.59%。 相似文献
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催化还原褪色光度法测定痕量锡的研究 总被引:2,自引:0,他引:2
周之荣 《华东地质学院学报》1998,21(1):88-91
痕量锡在稀磷酸介质中对次磷酸钠还原甲基绿褪色反应有催化作用。基于此,本文建立了痕量锡的动力学光度分析法。方法检出限为0.0066μg/L,线性范围为0 ̄4μg/L。结合磷酸三了酯色谱分离,实现地质样品中痕量锡的测定,结果与标准值相符。 相似文献
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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
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作者对激光热透镜光谱法测定微量钼进行了研究.试验表明,在丙酮介质中,Mo6+能被还原成Mo5+并形成钼蓝同多酸,最大吸收彼长在670um处,利用He-Ne激光器输出的632.8um的激光作光源,进行微量钼的热透镜法分析测定.两酮的存在能增强热透镜信号强度。钼含量在0.01—2.0μg/mL范围内与激光热透镜信号强度呈良好的线性关系,方法检出限为0.005μg/mL钼,已用于地质样品中微量钼的高灵敏度测定.结果满意. 相似文献
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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
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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
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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
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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
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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
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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
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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
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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