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1.
聚酰胺树脂富集分离-光度法连续测定铂和钯 总被引：1，自引：1，他引：1
试验了在柱层析操作条件下,聚酰胺树脂对铂和钯的吸附性能.结果表明,在 0.001～3.5 mol/L的HCl(或王水)介质中,聚酰胺树脂对铂和钯的吸附容量分别为20.92和19.20 mg/g,被酸性硫脲溶液洗脱后,用双十二烷基二硫代乙二酰二胺光度法测定.方法用于矿石中微量铂、钯的富集分离和测定,结果与等离子体发射光谱法及推荐值相符.铂、钯回收率均在93.7%～99.2%,相对误差分别为5.56%和4.44%. 相似文献
2.
D190型大孔巯基树脂分离富集原子吸收光谱法测定地质样品中微量金和钯 总被引：4，自引：0，他引：4
采用D190 型大孔巯基树脂分离富集微量金和钯 ,研究了各种条件对分离富集和测定的影响 ,证明了金和钯在 3 %王水介质中形成氯络阴离子与树脂上的巯基 (-SH)发生螯合作用形成螯合物而迅速地被吸附在树脂上。同时 ,溶液中一些贱金属离子不易与巯基生成螯合物而分离。采用酸性硫脲定量洗脱 ,树脂结构不被破坏 ,可重新使用 相似文献
3.
在王水介质中，硫脲纤维素吸附痕量钯，不受地质样品中普通离子的干扰。吸附的钯用硫脲溶液解脱并用ＦＡＡＳ法测定。研究了分离测定条件并成功用于测定地质样品中的痕量钯。 相似文献
4.
亚硝基R盐负载树脂分离富集测定样品中的金铂钯 总被引：5，自引：1，他引：5
以亚硝基R盐作为螯合剂制备了负载树脂,研究了用该树脂分离富集Au(Ⅲ)、Pt(Ⅳ)和Pd(Ⅱ)的最佳条件。当pH为2.0时,溶液中Au(Ⅲ)、Pt(Ⅳ)和Pd(Ⅱ)的氯络阴离子被吸附富集在树脂上,吸附率94%～96%,而大部分常见的贱金属离子在上负载树脂柱前上阳离子交换柱得以分离。用0.1mol/LHCl-30g/L硫脲溶液以0.5mL/min的流速对被吸附的Au(Ⅲ)、Pt(Ⅳ)和Pd(Ⅱ)进行洗脱,洗脱率96%,最后用原子吸收光谱法进行测定。方法经标样分析验证,结果与标准值相符,对含量为10-6水平的Au(Ⅲ)、Pt(Ⅳ)和Pd(Ⅱ),6次测定的RSD分别为5.2%、8.4%和6.9%。 相似文献
5.
NK8310螯合树脂分离富集地质样品中痕量金银铂钯及其测定 总被引：14，自引：3，他引：14
研究了硫脲螯合树脂（NK8310）分类富集地质样品中痕量Au、Ag、Pt和Pd的实验条件。在φ=10％的王水介质中，[AuCI4]^-、[AgCI2]^-、[PtCI6]^2-和[PdCI4]^2-定量吸附于树脂上并与大量贱金属分离；用5g/L硫脲－0.12mol/L HCI溶液洗脱Au、Ag、Pt和Pd，回收率为97％－104％。用硫镍矿管理样以及国家一级标准物质进行分析验证，分析结果与推荐值及标准值吻合，表明NK8310螯合树脂适用于地质样品中Au、Ag、Pt和Pd的分离富集。 相似文献
6.
本方法用HCl和H_2O_2分解试样,以泡沫塑料富集Au、Pt和Pd,在酸性介质中解脱,用电感耦合等离子体质谱法测定化探样品中痕量金铂钯,研究了富集解脱介质及浓度。结果表明,在0.5%NaI+0.5%KBr+20%HCl介质中泡沫塑料对Au、Pt、Pd的吸附率大于95%;在1%硫脲+2%KSCN+2%HCl解脱介质中Au、Pt、Pd的回收率高于90%。方法检出限为Au 0.072 ng/g,Pt 0.17 ng/g,Pd 0.096 ng/g,标准物质的测定值与标准值基本一致,准确度和精密度满足相关规范要求,因此该方法对化探样品中痕量金铂钯的测定有一定实用性。 相似文献
7.
石墨炉原子吸收光谱法测定地质样品中的痕量铂、钯 总被引：1，自引：0，他引：1
本文提出了用717阴离子交换树脂富集铂、钯的石墨炉原子吸收光谱分析方法。对富集铂、钯的条件,共存离子的干扰情况以及在GF-2000型石墨炉中测定铂、钯的最佳条件进行了研究。样品用王水分解后,在10％的王水介质中,用717阴离子交换树脂富集铂、钯,以热的硫脲溶液解脱,在拟定的工作条件下,于石墨炉原子吸收光谱仪上进行测定,大量的共存离子不干扰测定。方法简便快速,检出限分别为Pt8.8×10~(-9)g/ml,Pd3.4×10~(-9)g/ml,方法的相对标准偏差分别为Pt7.09％Pd11.48％,适用于地质样品中铂、钯的测定,结果令人满意。 相似文献
8.
离子交换分离富集原子吸收法测定岩矿中微量金 总被引：2，自引：0，他引：2
试验了410#哌啶树脂对微量金的吸附性能.在ψ为5%~10%的王水介质中,Au与Cl-可形成[AuCl-]络阴离子,并可被410#哌啶树脂吸附.吸附物采用30g/L硫脲溶液解吸后,进行原子吸收光谱测定.方法经金管理样测定试验,结果与推荐值相符. 相似文献
9.
D301R树脂吸附金(Ⅲ)的实验 总被引：4，自引：2，他引：4
研究了D301R树脂对金(Ⅲ)的吸附性能及其机理,测得在HAc-NaAc体系中pH=3.47时为最佳吸附条件。在298 K的温度下,pH=3.47的HAc-NaAc缓冲体系中树脂对金(Ⅲ)的静态饱和吸附容量为828.36 mg/g;测得吸附热力学参数分别为:ΔH=16.77 kJ/mol,ΔS=59.36J/mol K,ΔG298=-919.28 J/mol;吸附速率常数k298=2.17×10-5s-1,吸附活化能Ea=9.43 kJ/mol;用20%硫脲的丙酮溶液和6 mol/L的HCl溶液以1∶1混合洗脱,洗脱率达到95%以上;等温吸附曲线能很好地遵循Freundlich曲线;树脂的功能基与金(Ⅲ)的配位比接近1∶1。 相似文献
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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