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悬浮液进样—石墨炉原子吸收测定钒钛磁铁矿中痕量镓 总被引:5,自引:0,他引:5
研究了悬浮液进样_石墨炉原子吸收测定钒钛磁铁矿中痕量镓的分析方法。以Ni(Ⅱ)作为基体改进剂时,可直接用镓标准溶液进行校准。样品粒度<38μm、悬浮液中试样质量浓度在01~80g/L、含镓质量浓度不超过100μg/L时呈良好线性关系,检出限为24μg/L镓。用所拟方法测定了含镓量在16~42μg/g的标准矿样,结果与标准值相符,6次平行测定的相对标准偏差不超过9%,满足痕量分析的要求。 相似文献
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流动注射—催化光度法测定痕量锰 总被引:3,自引:0,他引:3
在非离子表面活性剂吐温-80存在的H3PO4介质中,Mn^2+对V(V)氧化二安替比林苯乙烯甲烷(DAVPM)成红色化合物的反应具有较强的催化作用,基于此采用流动注射-催化光度法测定了痕量Mn^2+,该方法的检测波长为555nm,检出限为0.02μg/L Mn,线性范围为0.02 ̄6μg/L Mn,进样频率为60次/h,对5μg/L Mn进行10次测定的相对标准偏差为1.8%。经环境标准样品分析验 相似文献
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阳极溶出伏安法同时测定痕量锡和镉 总被引:4,自引:1,他引:4
在HCl-NH_4Cl底液中,电解时间60s、电镀时间5s、除氧30s的条件下,Sn和Cd有稳定的溶出峰。Sn和Cd的检出限分别为6.5μg/L和3.0μg/L,测定范围分别为10~200μg/L和5~180μg/L。对含Sn和Cd为20μg/L的试液测定10份,RSD分别为5.61%和4.83%。方法用于实际样品测定,结果与文献方法相符。 相似文献
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悬浮液原子荧光光谱法测定化探样品中的痕量汞 总被引:3,自引:0,他引:3
拟定了将悬浮液技术与汞蒸气原子荧光光谱法相结合测定化探样品中痕量Hg的分析方法。控制悬浮液中试样粒度在200目,试样质量浓度15g/L,用电磁搅拌和载气搅拌保证悬浮液分散稳定,水溶液标准作校正曲线,方法的检出限为6ng/gHg。对水系沉积物国家标准物质中痕量Hg进行测定,结果与标准值相符,对含Hg010μg/g的GBW07305(GSD5)测定11次,x为0105μg/g,RSD为54%。 相似文献
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β—环糊精富集固相反射散射分光光度法测矿样中钴 总被引:1,自引:0,他引:1
用自制的β-环糊精交联聚合物树脂对α-吡啶偶氮-β-萘酚(PAN)-Co络合物进行包结吸附,用固相反射散射分光光度法测定钴。实验表明,β-CD树脂包结PAN-Co络合物后提高体系灵敏度,然的质量浓度在0 ̄0.6nm/L有良好的线性关系,检出限为10μg/L,测定3μgCo11次,其相对标准偏差为2.0%。经固定标准物质分析验证,结果与标准值相符,钴锰矿测定结果与原结果一致。样品分析的RSD〈2.0 相似文献
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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
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优化偏最小二乘光度法同时测定铑铱钯的研究 总被引:6,自引:0,他引:6
采用局部加权、随机矩阵法等步骤,使建立的校准模型能充分反映未知样品的数字结构特征,达到优化的目的,从而改善偏最小二乘法在处理实际未知样品数据时的解析能力,以提高计算结果的精度。用该优化偏最小二乘法对模拟地质样品中痕量贵金属Rh、Ir、Pd进行多组分光度测定,其分析结果的相对误差均小于10%;分别测定9.5μg/L、35.0μg/L、66.0μg/L含量的Rh、Ir和Pd7次,其标准偏差Rh为0.2;Ir为1.1;Pd为2.0。 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