共查询到20条相似文献，搜索用时 453 毫秒
1.
本文研究了铁(Ⅰ)与硫氰酸盐-吐温-40的显色反应。在pH1.7—3.3的盐酸-乙酸钠介质中显色。络合物的最大吸收峰位于484 nm,摩尔吸收系数为2.13×10~4L·mol~(-1)·cm~(-1),铁量在0—200μg/25ml服从比尔定律。方法适用于矿石中铁的测定。 相似文献
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介绍了新水溶性显色剂 2 - ( 2 ,3,5 -三氮唑偶氮 ) - 1 ,8-二羟基 - 3,6-萘二磺酸与钴的显色反应及应用 ,建立了测定钴的新方法。在 pH 9.9的Na2 B4O7 NaOH缓冲液中该试剂与钴形成 1∶1蓝色稳定络合物 ,λmax为 5 88.8nm ,Co的质量浓度在 0～ 1 .0mg/L内符合比尔定律 ,表观摩尔吸光系数为 3.46× 1 0 4 L·mol- 1 ·cm- 1 。所拟方法用于环境水样及维生素B1 2 注射液中的微量钴测定 ,结果与原子吸收法相符 ,5次测定的RSD <1 %。 相似文献
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钍—偶氮胂Ⅲ—乙醇体系显色反应的研究及应用 总被引：1，自引：0，他引：1
本文研究了在乙醇存在的体系中偶氮胂Ⅲ与Th的显色反应条件。当乙醇含量为48％时,Th与偶氮胂Ⅲ反应的最佳酸度为3.4—5.5mol/L HCl,其最大吸收波长为660nm,表观摩尔吸光系数为1.4×10~5L·mol~(-1)·cm~(-1),Th量在0—80μg/25ml范围服从比尔定律。探讨了乙醇的作用机理,并将方法用于岩石中痕量Th的测定,获得良好结果 相似文献
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2:3的蒙皂石-云母间层矿物产于含锰碳酸盐矿物中,与方解石、钙菱锰矿、菱锰矿、菱铁矿、黄铁矿、黄铜矿和锐钛矿共生。矿物呈片状和不规则粒状,颜色呈灰、灰白色和浅黄色,条痕灰白色。显微硬度78kg/mm~2、摩氏硬度1.5。比重2.58。比磁化系数3.35×10~(-6)C·G·S·M·cm~3=/g。主要X射线粉晶线是11.39(100),5.06(87),4.48(81),3.28(70)。矿物的红外吸收谱特征为:3600—3700,1000—1050,540,490cm~(-1),此外还对该矿物作了差热分析。 相似文献
5.
1-（2，6-二溴-4-硝基苯）-3-（4-硝基苯）-三氮烯光度法测定铜 总被引：21，自引：3，他引：21
建立了用 1 - ( 2 ,6-二溴 - 4-硝基苯 ) - 3- ( 4 -硝基苯 ) -三氮烯 (DBNPNPT)分光光度法直接测定铜矿及铝合金样品中铜的方法。在表面活性剂TritonX - 1 0 0的存在下 ,pH在 9.5～ 1 1 .5的Na2 B4O7-NaOH介质中 ,DBNPNPT与Cu2 +可生成黄色络合物 ,以 5 35nm为参比波长 ,45 0nm为测定波长的双峰双波长法进行测定 ,表观摩尔吸光系数可达 1 .1 1× 1 0 5L·mol- 1 ·cm- 1 ,Cu2 +的质量浓度在 0～ 360 μg/L符合比尔定律。方法用于铜矿中铜的测定 ,结果与原子吸收法吻合。对于w(Cu)为 0 .1 1 %的BY2 1 70 - 1铝合金试样测定 1 0次 ,其RSD为3.4%。 相似文献
6.
苯基荧光酮—CPB光度法测定铜 总被引：5，自引：1，他引：5
本文研究了在溴化十六烷基吡啶(CPB)存在下,苯基荧光酮(PF)与Cu的显色反应条件。结果表明:在pH5.4六次甲基四胺-HC1缓冲介质中,Cu(Ⅱ)与PF及CPB生成的三元配合物最大吸收波长在565nm,表观摩尔吸光系数为1.1×10~5L·mol~(-1)·cm~(-1),Cu量在0—3μg/25ml范围内符合比尔定律,方法可用于硫铁矿中x—0.00x%Cu的测定。 相似文献
7.
4—（2—羟基—4—硝基苯偶氮）—1—苯基—3—甲基吡唑啉酮与钍的显色反应 总被引：4，自引：0，他引：4
在pH为 2～ 3的HAc介质中 ,4 - ( 2 -羟基 - 4 -硝基苯偶氮 ) - 1 -苯基 - 3-甲基吡唑啉酮 (HNAPMP)与钍反应生成 2∶1的稳定络合物 ,λmax=540nm ,ε=4 .96× 1 0 4L·moL- 1·cm- 1,Th质量浓度在 0～ 2 .8mg/L内符合比尔定律。方法用于钍钨合金中钍的测定 ,相对标准偏差 (n =5)小于 1 % ,加标回收率为 97%～ 1 0 2 %。 相似文献
8.
1—（2—羟基—3,5—二硝基苯）—3—4（4—苯基—2—噻唑）—三氮稀的合成及其与镍的显 总被引：7，自引：0，他引：7
合成了新试剂 1 - (2 -羟基 - 3,5-二硝基苯 ) - 3- (4-苯基 - 2 -噻唑 ) -三氮烯 ,研究了在表面活性剂TritonX - 1 0 0存在下 ,它与Ni2 的显色反应。结果表明 ,在 pH 6.0～ 7.5时 ,Ni2 与该试剂形成配合物 ,其最大吸收峰位于 51 5nm处 ,摩尔吸光系数为 1 .0 8× 1 0 5 L·mol- 1 ·cm- 1 。Ni2 在 0～ 0 .4mg/L内符合比尔定律。方法已用于矿物、合金、钢样中微量镍的测定 ,结果与原子吸收法相符 ,相对标准偏差RSD <5% (n =6) 相似文献
9.
锰—二氯苯基荧光酮—混合表面活性剂体系测定痕量锰 总被引：4，自引：0，他引：4
本文研究了在CTMAB-OP存在下,Mn(Ⅱ)与2′,4′-二氯苯基荧光酮、水杨基荧光酮(SAF)及邻硝基苯基荧光酮的显色反应。结果表明,以2′,4′-二氯苯基荧光酮体系的灵敏度为最高。其ε=1.64×10~5L·mol~(-1)·cm~(-1),线性范围在0—5μg/25ml Mn(Ⅱ)。采用MIBK萃取分离可消除Fe(Ⅲ)等的干扰,而避免使用KCN。方法已用于测定白云石、磁铁矿、高硼玻璃及铝合金中的Mn,所得结果与标准值基本符合。 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
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
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Muriel Rocher Stéphane Baize Stéphane Jaillet Edward Marc Cushing Yannick Lozac&#x;h Francis Lemeille 《Comptes Rendus Geoscience》2003,335(8):701-708
Calcite samples were extracted both from the rock matrix and the superficial coating of a karstified fault plane of an underground quarry, located in the eastern border of the Paris basin. The karstification is dated as Quaternary. Analysis of mechanical calcite twinning reveals that only the calcite matrix has also undergone a compression trending WNW that can be attributed to the Mio-Pliocene alpine collision. Both coating and matrix have undergone a strike-slip regime with σ1 roughly trending north–south, that could correspond to the regional present-day state of stress, a strike-slip compression rather trending NNW, modified by local phenomena. To cite this article: M. Rocher et al., C. R. Geoscience 335 (2003). 相似文献
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正20141520 Bo Ying(Key Laboratory of Metallogeny and Mineral Assessment,MLR,Beijing 100037,China);Liu Chenglin Saline Spring Hydrochemical Characteristics and Indicators for Potassium Exploration in Southwestern and Northern Tarim Basin,Xinjiang(Acta Geoscientica Sinica,ISSN1006-3021,CN11-3474/P,34(5),2013,p.594-602,5 illus.,3 tables,28 refs.) 相似文献
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正20141243Chen Ge(Hangzhou Research Institute of Petroleum Geology,PetroChina,Hangzhou 310023,China);Si Chunsong Study on Sedimentary Numerical Simulation Method of Fan Delta Sand Body(Journal of Geology, 相似文献
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正20142599Chen Sanming(Guangxi Key Laboratory of Concealed Deposits Exploration,Guilin University of Technology,Guilin541004,China);He Yuzhou Block Model and Reserves Estimation of Panzhihua Iron Deposit Based on 3D Geological Modeling(Journal of Guilin University of Technology,ISSN1674-9057,CN45-1375/N,33(4),2013,p.610-615,9illus.,1table,15refs.) 相似文献
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正20140594 Bai Daoyuan(Hunan Institute of Geology Survey,Changsha 410016,China);Zhong Xiang Faults in the Jingzhou Basin and Their Tectonic Settings(Geotectonica et Metallogenia,ISSN1001-1552,CN44-1595/P,37(2),2013,p.173-183,6illus.,59refs.)Key words:basin evolution,tectonic setting,South China In the Upper Paleozoic and Jurassic se- 相似文献
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正20141912Cao Hui(State Key Laboratory for Continental Tectonics and Dynamics,Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China)Gravitational Collapse and Folding during Orogenesis:A Comparative Study of FIA Trends and Fold Axial Plane Traces(Geology in China,ISSN1000-3657,CN11-1167/P,40(6),2013,p.1818-1828,9illus.,35refs.,with 相似文献