表面活性剂对钪－铜铁试剂络合吸附波的增敏效应

探讨了各种类型的表面活性剂对Ｓｃ－铜铁试剂体系的增敏效应；观察到在ｐＨ９．０的ＮＨ＿４ＯＨ－ＮＨ＿４Ｃｌ缓冲介质中，溴化十四烷基三甲铵使该体系催化波灵敏度提高了２５倍。峰电位在－１．５０Ｖ（ｕｓ．Ａｇ／ＡｇＣｌ），峰高与Ｓｃ浓度在２～４０ｎｇ／ｍｌ呈线性关系，检出限１ｎｇ／ｍｌ；用拟定的方法测定了岩石样品中的痕量Ｓｃ；并对其极谱性质和表面活性剂增敏机理进行了探讨。     

表面活性剂对钪—铜铁试剂络合吸附波的增敏效应

探讨了各种类型的表面活性剂对Ｓｃ－铜铁试剂体系的增敏效应；观察到在ＰＨ９．０的ＮＨ４ＯＨ－ＮＨ４Ｃｌ缓冲介质中，溴化十四烷基三甲铵使该体系催化波灵敏度提高了２５倍。峰电位在－１．５０Ｖ，峰高与Ｓｃ浓度在２－４０ｎｇ／ｍｌ呈线性关系，检出限１ｎｇ／ｍｌ；用拟定的方法测定了岩石样品中的痕量Ｓｃ；并对其极谱性质和表面活性剂增敏机理进行了探讨。     

杂多酸体系极谱波测定钢中微量磷

在０．１３ｍｏ１／ＬＮ＿２ＳＯ＿４及８％丙酮介质中，ｐ（Ⅴ）－Ｓｂ（Ⅲ）－Ｗ（Ⅵ）三元杂多酸在示波极谱仪上产生一良好的吸附还原波。峰电位为一０．５２Ｖ（υｓ．ＳＣＥ），峰电流（导数波高）与Ｐ浓度在８．０×１０￣（－７）～２．０×１０￣（－５）ｍｏｌ／Ｌ范围内呈线性关系，检测下限为２．０×１０￣（－７）ｍｏｌ／Ｌ。对极谱波的性质进行了探讨，用该法测定了钢标样中的微量Ｐ，结果与推荐值相符。     

基性岩超基性岩中痕量铂的催化极谱测定

本文针对基性岩超基性岩中ＳｉＯ＿２，Ａｌ＿２Ｏ＿３，Ｆｅ＿２Ｏ＿３，ＭｇＯ，ＣａＯ等含量高的特点，确定了１ｍｏｌ／Ｌ盐酸—０．１ｇ／Ｌ硫酸肼—３×１０￣（－３）ｍｏｌ／Ｌ甲醛底液测定痕量铂的体系，通过控制温度与改进熔矿方法，增强了体系稳定性，消除了ＳｉＯ＿２等的干扰。用于铜镍矿、铬铁矿和硅酸盐管理样的测定，结果符合要求。     

钴—对乙酰基偶氮羧极谱催化波的研究

在ＨＡｃ－ＮａＡｃ，ＮａＮＯ２，ＣＴＭＡＢ介质中，Ｃｏ与对乙酰基偶氮羧络合物产生一灵敏的极谱催化波，峰电位在－０．９０Ｖ，Ｃｏ浓度在（０．０１－０．１２）μｇ／２５ｍｌ范围内与峰电流呈线性关系，检测下限为２×１０＾－４μｇ／ｍｌ，常见共存离子不干扰测定。     

铬—邻菲啰啉—亚硝酸钠—溴化十六烷基三甲铵体系的极谱催化波

本文提出邻菲口罗啉—亚硝酸钠—溴化十六烷基三甲铵测定铬的新体系。在０．２４ｍｏｌ·Ｌ－１ＮａＮＯ２－１．２×１０－５ｍｏｌ·Ｌ－１Ｏ－Ｐｈｅｎ－４．８×１０－５ｍｏｌ·Ｌ－１ＣＴＭＡＢ（ｐＨ９．３）底液中,Ｃｒ（Ⅵ）于－１．４０Ｖ（Ｖｓ：ＳＣＥ）产生一灵敏、尖锐、稳定的极谱波。Ｃｒ（Ⅵ）浓度在０～６０μｇ·Ｌ－１范围内与峰电流呈良好的线性关系。用本法测定了水样及钢样中痕量铬,结果良好。本文还对极谱波的性质进行了初步探讨。     

示波极谱法测定矿石中的金

在ＰＴ－Ｈ３ＰＯ４－ＮａＨ２ＰＯ４体系中,金有一个络合吸附波,峰电位为－０．３２Ｖ（Ｖｓ．ＳＣＥ）,检测下限为８．２×１０＾－９ｍｏｌ．Ｌ＾－１峰电流与金含量在０．０２０～０．８０μｇ．ｍｌ＾－１范围内呈线性关系,该法可用于金矿中金的测定。     

流动注射－化学发光法测定钽

利用Ｔａ对鲁米诺－Ｈ＿２Ｏ＿２－Ｋ＿３Ｆｅ（ＣＮ）＿６化学发光体系的抑制作用，建立了痕量Ｔａ的化学发光分析法，由流动注射－化学发光仪实现测定。方法的检出限是５．０ｎｇ／ｍｌＴａ（Ｖ），测定范围为０．０１～１μｇ／ｍｌＴａ（Ｖ），测定０．０１μｇ／ｍｌＴａ（Ｖ）１１次的相对标准偏差为３．８％。方法已应用于矿石中Ｔａ的测定。     

小试金富集—示波极谱法测定地质物料中超痕量铂

用小试金富集，示波极谱法测定地质物料中１０＾－１１级Ｐｔ。首先用灰吹预富集１０ｇ物料中的Ｐｔ于１ｍｇ的银闰中，将合粒溶解，用示波极谱法测定。方法检出限为０．０１ｎｇ／ｍｌ，线性范围为０．１－３０ｎｇ／５ｍｌ，标准回收８９－１０２％。峰电位－０．９５Ｖ。方法快速、简便，适用于地质物料分析。     

铜—亚硝基R盐极谱波研究及分析应用

在ＰＨ３．５的Ｂｒｉｔｔｏｎ－Ｒｏｂｉｎｓｏｎ缓冲溶液中，Ｃｕ－亚硝基Ｒ盐体系在－０．１４Ｖ可产生较为灵敏的极谱流。二阶导皮高与Ｃｕ浓度在０－０．６μｇ／ｍｌ范围内线性关系。检出限为０．００３μｇ／ｍｌ，研究了极谱波性质及电极反应机理，证明其为同时受扩散控制的络合附附波本法已用于土壤、人发样中Ｃｕ的测定。     

The terrestrial fauna of the Late Triassic Pant-y-ffynnon Quarry fissures,South Wales,UK and a new species of Clevosaurus (Lepidosauria: Rhynchocephalia)

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.     

Définition d'une limite multicritère ; stratigraphie du passage Campanien–Maastrichtien du site géologique de Tercis (Landes,SW France)Definition of a multi-criteria boundary; stratigraphy of the Campanian–Maastrichtian interval of the geological site at Tercis (Landes,SW France)

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.     

The effect of water on accessory phase solubility in subaluminous and peralkaline granitic melts

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.     

Quaternary stresses revealed by calcite twinning inversion: insights from observations in the Savonnières underground quarry (eastern France)

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).     

HYDROGEOLOGY

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     

METAMORPHIC PETROLOGY

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),     

SERIALS

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GEOPHYSICAL EXPLORATION

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-     

QUATERNARY GEOLOGY & GEOMORPHOLOGY

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-     

PETROLEUM GEOLOGY

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.)