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1.
氢化物-原子荧光法测定铜矿中微量硒和碲 总被引：11，自引：11，他引：11
采用Fe3 + 盐和 1 ,1 0 -二氮杂菲作干扰抑制剂 ,氢化物 -原子荧光光谱法直接测定铜矿中微量硒和碲。H2 SO4和HClO4的存在对硒、碲有明显的增敏作用。方法检出限分别为LD(Se) =0 .1 5 μg/L ,LD(Te) =0 .2 0 μg/L。方法适用于w(Cu) <2 5 %的铜矿和其它岩石样品中硒和碲的测定 ,经标样分析验证 ,结果与标准值相符 ,1 2次测定的RSD分别为RSD(Se) =4.2 2 % ,RSD(Te) =6.3 1 %。 相似文献
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本文研究了双毛细管雾化器氢化物-火焰原子吸收法测定地质样品中痕量Se和Te的方法。测定Se、Te的灵敏度分别为0.012μg/ml和0.0088μg/ml(1％吸收);对含1.6ppm Se与0.42ppm Te的样品测定,其RSD(n=6)分别为3.3％和5.5％。方法简单、灵敏、实用。用GSS及GSD系列部分标样验证了方法的可靠性,可以测定一般地质样品中0.0001％以上的Se和0.0000x％以上的Te。 相似文献
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悬浮液进样-氢化物发生原子荧光光谱法测定土壤中痕量砷锑硒 总被引：5，自引：2，他引：5
在原子荧光光谱法传统样品前处理的基础上，提出了悬浮液进样技术。用琼脂作为悬浮剂，水溶液作为校正曲线，对土壤标准样品和实际样品进行测定，结果令人满意，并且省去了冗长的样品化学前处理过程。检出限分别为砷0．33μg／L、锑0．13μg／L、硒0．06μg／L；相对标准偏差分别为：砷3．92％～6．32％、锑1．76％～3．11％、硒3．08％～5．54％；回收率分别为砷98．7％～105．7％、锑99．5％-103．3％和硒94．6％-107．2％。国家一级标准物质的测定结果与标准值相符，实际样品的测定值与传统消化法相比较，结果基本一致。 相似文献
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氢化物双道无色散原子荧光法同时测定化探样品微量硒,碲 总被引：1，自引：0，他引：1
P. 《有色金属矿产与勘查》1995,4(4):233-236
在硝酸、高氯酸、硫酸溶矿方法的基础上，作者用硝酸、氢氟酸溶矿，高氯酸冒烟，趁热加入浓盐酸将硒、碲还原成低价；用三价铁盐消除铜等元素的干扰，以氢化物双道原子荧光法同时测定化探样品中的硒和碲。经国家一级标样验证，这种方法简便可靠，具有较高的灵敏度。硒、碲的检出限分别为：ω（Ｓｅ）／１０＾－６＝０．０１，ω（Ｔｅ）／１０＾－６＝０．００８。 相似文献
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原子荧光光谱法直接测定铜矿中的硒 总被引：6，自引：5，他引：6
采用硫脲抑制铜的干扰，不经分离富集原子荧光光谱法直接测定铜矿中的Se。方法的检出限为0．02μg/g。Se浓度在0～80μg／L与荧光强度呈线性关系。用铜矿石国家一级标准物质GBW 07233(ωSe为5．1μg／g)和GBW 07234(ωSe为0.89μg／g)进行精密度试验，RSD(n=12)为3.44％、8.06％。加标准回收试验结果，Se的回收率为93．2％～104、6％。经铜矿石国家标准物质验证，测定结果与标准值相符，方法适用于铜矿中0～8．0μg／g Se的测定。 相似文献
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多目标生态地球化学调查土壤样品中砷硒锑有效态分析方法的商榷 总被引：5，自引：2，他引：5
以0．10mol／L NaH2PO4和0．50mol／L NaHCO3为浸提剂，试验了其对土壤样品中As、Se、Sb的浸提效果；以氢化物发生-原子荧光法(HG-AFS)测定了浸提液中As、Se、Sb的含量。方法在武汉、宁镇测区应用试验表明：采用0．50mol／L的NaHCO3为As、Se、Sb的有效态浸提剂，以HG—AFS法测定其含量的方案可行，检出限分别为：0．006mg／kg、0．001mg／kg、0．002mg／kg。精密度试验，6个标准样品的RSD(n=12)As、Se、Sb均≤10．15％。 相似文献
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阳极泥及碲回收物料中高含量碲的测定 总被引：2，自引：0，他引：2
采用重铬酸钾容量法，测定铜铅阳极泥及碲回收物料中高含量碲。针对阳极泥样品成分复杂的特征，确定了最佳溶样介质；探讨了Cu^2 ,Cd^2 ,Bi^3 ,Ag^ ,Sb(Ⅲ）,As（Ⅲ），Pb^2 ,Se（Ⅳ），Sn（Ⅳ），Au(Ⅲ）等共存元素的影响及其消除方法；改善了滴定条件。方法适用于w(Te)＞1％碲的测定，样品分析结果与原子吸收法测定结果一致，RSD（n＝5）为0.4％－4.1％。 相似文献
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悬浮进样石墨炉原子吸收法测定纳米氧化锆粉体中的微量铝 总被引：2，自引：0，他引：2
采用水介质直接分散纳米氧化锆粉体悬浮进样，以水标准溶液绘制校正曲线，石墨炉原子吸收法测定其中的微量Al。系统研究了Al的原子化和灰化行为，不同分散介质及基体元素对测定Al的影响，获得了测定Al的优化条件。方法对Al的检测限为0．5ng／g，Al的线性范围为0～2．5mg／L，基体ZrO2的质量浓度小于2g／L时，对Al的测定无干扰，悬浮进样直接测定的RSD(n=5)为6．0％。样品的测定结果与其他方法对比基本一致。 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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Inter-regional correlation of transgressions and regressions in the Cretaceous period 总被引：1，自引：0，他引：1
T. Matsumoto 《Cretaceous Research》1980,1(4):359-373
Well investigated platforms have been selected in each continent, and the history of Cretaceous transgressions and regressions there is concisely reviewed from the available evidence. The factual records have been summarized into a diagram and the timing of the events correlated between distant as well as adjoining areas.On a global scale, major transgressions were stepwise enlarged in space and time from the Neocomian, via Aptian-Albian, to the Late Cretaceous, and the post-Cretaceous regression was very remarkable. Minor cycles of transgression-regression were not always synchronous between different areas. Some of them were, however, nearly synchronous between the areas facing the same ocean.Tectono-eustasy may have been the main cause of the phenomena of transgression-regression, but certain kinds of other tectonic movements which affected even the so-called stable platforms were also responsible for the phenomena. The combined effects of various causes may have been unusual in the Cretaceous, since it was a period of global tectonic activity. The slowing down of this activity followed by readjustments may have been the cause of the global regression at the end of the Cretaceous. 相似文献
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The Afyon stratovolcano exhibits lamprophyric rocks, emplaced as hydrovolcanic products, aphanitic lava flows and dyke intrusions, during the final stages of volcanic activity. Most of the Afyon volcanics belong to the silica-saturated alkaline suite, as potassic trachyandesites and trachytes, while the products of the latest activity are lamproitic lamprophyres (jumillite, orendite, verite, fitztroyite) and alkaline lamprophyres (campto-sannaite, sannaite, hyalo-monchiquite, analcime–monchiquite). Afyon lamprophyres exhibit LILE and Zr enrichments, related to mantle metasomatism. 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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正20140876 Gao Junbo(College of Resources and Environmental Engineering,Guizhou University,Guiyang 550025,China);Yang Ruidong Study on the Strontium Isotopic Composition of Large Devonian Barite Deposits from Zhenning,Guizhou Province(Geochimica, 相似文献
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正20141470 Chai Lu(Shenyang Institute of Geology and Mineral Resources,CGS,Shenyang110034,China);Zhu Qun Distribution of Significant Metal Mineral Resources the in Adjacent Areas of China,Russia and Mongolia(Geology and Resources,ISSN1671-1947,CN21-1458/P,22(5),2013,p.397-402,2 illus.,3 tables,20 refs.)Key words:metal ores,China,Russia,Mongolia 相似文献
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正20141944Bao Hanyong(Research Institute of Exploration and Development,Jianghan Oilfield,SINOPEC,Wuhan 430223,China);Guo Zhanfeng Tectonic-Thermal Evolution of the Subei Basin since the Late Cretaceous(Geological Journal of China Universities,ISSN1006-7493,CN32-1440/P,19(4), 相似文献
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正20140692 Duo Tianhui(No.402 Geological Team,Exploration of Geology and Mineral Resources of Sichuan Authority,Chengdu611730,China);Wang Yongli Computer Simulation of Neptunium Existing Forms in the Groundwater(Computing Techniques for Geophysical and Geochemical Exploration,ISSN1001-1749,CN51-1242/P,35(3), 相似文献
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正20142512Chen Xiaoan(Jiangxi Provincial Research Institute of Soil and Water Conservation,Nanchang 330029,China);Yang Jie Distribution Characteristics and Causes of Collapse Erosion(Journal of Mountain Research,ISSN1008-2786,CN51-1516/P,31(6),2013,p.716-722,2illus.,7tables,14refs.) 相似文献
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正20140644Cao Ying(Earthquake Administration of Yunnan Province,Kunming 650224,China);Wu Xiaoping Research on Structural Stress Field Basing on Focal Mechanism Solutions Data in Sichuan-Yunan Area(Journal of Seismological Research,ISSN1000-0666,CN53-1062/P,36(2),2013,p.165-172,6illus.,2tables,16refs.) 相似文献