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二安替比林基—(2—溴)苯基甲烷与铈的显色反应及应用 总被引:4,自引:0,他引:4
合成了二安替比林基_(2_溴)苯基甲烷(DAoBM)。在Mn(Ⅱ)和吐温_80存在下,Ce(Ⅳ)与DAoBM反应生成有色化合物,λmax为480nm,摩尔吸光系数为31×105L·mol-1·cm-1。Ce(Ⅳ)的质量浓度为0004~02mg/L时符合比尔定律。方法已用于稀土矿石中微量Ce(Ⅳ)的测定,结果与ICP_AES法相符 相似文献
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研究了在氯化十六烷基吡啶(CPC)和乳化剂OP存在下,Mg与邻氯苯基荧光酮(o-Cl-PF)的显色反应。在pH12的碱性介质中,Mg(Ⅱ)与o-Cl-PF形成1:3的蓝色配合物,其λ_max=612nm,表现摩尔吸光系数ε_612=1.39×10 ̄5L·mol ̄-1·cm ̄-1,Mg(Ⅱ)在0~0.2μg/ml范围内符合比尔定律。方法用于新陶瓷材料氮化硅(Si_3N_4)中微量MgO的测定,其结果与原子吸收光谱法相符。 相似文献
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在十二烷基硫酸钠存在下,于pH48~74的缓冲溶液中,2_〔2_(6_甲基苯并噻唑)偶氮〕_5_二乙氨基苯甲酸(6_Me_BTAEB)与Co(Ⅱ)发生显色反应,形成稳定的蓝紫色络合物,其组成为nCo(Ⅱ)∶n6_Me_BTAEB=1∶2,最大吸收波长为650nm,ε为138×105L·mol-1·cm-1,Co(Ⅱ)质量浓度在0~032mg/L时服从比尔定律。方法可直接用于维生素B12和含钴分子筛中微量Co(Ⅱ)的测定,结果与原子吸收法相符。对于w(Co)=0.82%的含钴分子筛测定8次,其RSD为134%。 相似文献
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在pH56~64的缓冲介质中,Sc(Ⅲ)埃铬菁R(ECR)氯化十六烷基吡啶(CPC)乳化剂OP形成蓝色配合物,其组成比nSc∶nECR∶nCPC=1∶2∶2。配合物的最大吸收波长在610nm处,表观摩尔吸光系数为171×105L·mol-1·cm-1。Sc质量浓度为0~024mg/L时遵守比尔定律。拟定的方法结合PMBP萃取分离,测定钨矿及其浸出渣中的微量Sc,可获满意结果 相似文献
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2—(5—溴—2—吡啶偶氮)—5—二甲氨基苯胺与铂显色反应的研究及应用 总被引:7,自引:1,他引:6
研究了显色剂2(5溴2吡啶偶氮)5二甲氨基苯胺(5BrPADMA)与Pt(Ⅱ)的显色反应。结果表明,在乙醇存在下,10~32mol/LH3PO4介质中,试剂与Pt(Ⅱ)15min即形成稳定的紫蓝色配合物,并至少稳定24h。该配合物的最大吸收波长位于628nm处,表观摩尔吸光系数为873×104L·mol-1·cm-1,其组成为nPt(Ⅱ)∶n5BrPADMA=1∶1,Pt(Ⅱ)的质量浓度在0~10mg/L符合比尔定律。所拟方法用于二次合金管理样及催化剂中铂的直接测定,结果与推荐值相符,精密度好,RSD<0.5%(n=6)。 相似文献
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在pH45的HAc_NaAc介质中,In_1_苯基_3_甲基_4_苯甲酰基吡唑啉酮_5(PMBP)_安替比林体系于-057V(vs.SCE)处产生一良好的极谱波。In在001~05mg/L与波高呈线性关系。检出限01μg/L。实验证明,该波为可逆的络合物吸附波,络合物中的电还原体为中心离子In3+。In3+与PMBP的组成比为1∶2。在不改变峰电位的情况下,安替比林使In_PMBP_HAc_NaAc体系的极谱波高显著增加,波形变得非常尖锐对称。探讨了安替比林增敏作用机理。 相似文献
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研究结果表明,在混合表面活性剂CTMAB-吐温-60存在下的pH5.7~6.5的缓冲介质中,Sc(Ⅲ)与4,5-二溴苯基荧光酮(DBPF)形成高灵敏的多元配合物,其ε_(590)=2.26×10 ̄5L·mol ̄(-1)·cm ̄(-1),组成比为:Sc:DBPF:CTMAB=1:2:4。采用混合表面活性剂使增溶增敏作用更为显著,并加速了显色反应,增强了配合物的稳定性。而Na_2SO_4的加入能显著地提高体系的灵敏度。Sc量在0~0.36ug/ml范围内遵守比尔定律。方法可直接测定合成混合稀土中的Sc,回收率在98%~105%;结合沉淀分离和PMBP萃取分离,实现了地质试样中痕量Sc的测定。 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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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 Lozach 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20141756 Chen Ruige(Mathematical College,China University of Geosciences,Beijing100083,China);Zhou Xun Numerical Simulation of Groundwater Level Fluctuation in a Coastal Confined Aquifer with Sloping Initial Groundwater Level Induced by the Tide(Geological Bulletin of China,ISSN1671-2552,CN11-4648/P,32(7),2013,p.1099-1104,6 illus.,16 refs.) Key words:confined water,groundwater level 相似文献
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正20141408 Cai Jia(Institute of Geology,Chinese Academy of Geological Sciences,Beijing100037,China);Liu Fulai Petrogenesis and Metamorphic P-T Conditions of Garnet-Spinel-Biotitebearing Paragneiss in Danangou Area,Daqingshan-Wulashan Metamorphic Complex Belt(Acta Petrologica Sinica,ISSN1000-0569,CN11-1922/P,29(7), 相似文献
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正20142386An Guoying(China Aero Geophysical Survey and Remote Sensing Center for Land and Resources,Beijing 100083,China)Application of Satellite Remote Sensing in Regional Hydrogeological Investigation:Taking Cenozoic Strata in Wenquan Sheet(1∶250 000)of Karakoram Range as an Example(Geosci- 相似文献
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正20141016An Chengbang(Key Laboratory of Western China’s Environmental Systems,Ministry of Education,Lanzhou University,Lanzhou 730000,China);Zhao Yongtao Lake Records during the Last Glacial Maximum from Xinjiang,NW China and Their Climatic Impli- 相似文献
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正20141538 Cao Qing(School of Earth Sciences and Engineering,Xi’an Petroleum University,Xi’an 710065,China);Zhao Jingzhou Characteristics and Significance of Fluid Inclusions from Majiagou Formation,Yichuan Huangling Area,Ordos Basin(Advances in Earth Science,ISSN1001-8166,CN62-1091/P,28(7),2013,p.819-828,7 illus.,3 tables,43 refs.) 相似文献
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正20142002 Wei Hualing(Institute of Geophysical and Geochemical Exploration,Chinese Academy of Geological Sciences,Langfang065000,China);Zhou Guohua Element Content and Mineral Compositions in Different Sizes of Soil in Tongling Area,Anhui Province(Geological Bulletin of China,ISSN1671-2552,CN11-4648/P,32(11),2013,p.1861 相似文献