催化光度法测定痕量锇

在０５ｍｏｌ／Ｌ的Ｈ２ＳＯ４介质中,Ａｓ（Ⅲ）存在下,Ｏｓ（Ⅷ）催化ＫＣｌＯ３氧化邻苯二酚紫褪色反应。反应受温度、反应时间影响,冷却及加入抗坏血酸可终止反应。据此,建立了一个测定痕量Ｏｓ（Ⅷ）的新方法。方法的灵敏度为２５７×１０－１０ｇ／ＬＯｓ（Ⅷ）,测定范围为０～００９１μｇ／Ｌ,用地质管理样中锇的测定验证,结果与原结果相符     

光度法测定痕量钛的研究

基于痕量Ｔｉ（Ⅳ）在稀Ｈ２ＳＯ４介质中对ＥＤＴＡ还原Ｃｒ２Ｏ２－７褪色反应的抑制作用,建立了测定痕量Ｔｉ（Ⅳ）的光度法。测定范围为２４～２４μｇ／Ｌ,检出限为１０６×１０－７ｇ／ＬＴｉ（Ⅳ）。结合萃取分离富集技术,方法用于测定人发及茶叶样品中的痕量Ｔｉ（Ⅳ）,结果与标准值相符,加标回收率在９５％～１００％,ＲＳＤ（ｎ＝６）为１１％～２０％。     

催化光度法测定痕量的研究

研究了在ＫＨＤ２ＰＯ４－Ｎａ２Ｂ４Ｏ７缓冲介质中,痕量镍催化Ｈ２Ｏ２氧化胭脂红褪色的指示反应及动力学条件,测定了反应活化能,建立了动力学光度法测定痕量镍的新方法。     

催化褪色光度法测定痕量铁（Ⅲ）的研究

研究了在Ｈ２ＳＯ４介质中，铁催化Ｈ２Ｏ２氧化酸性铬蓝Ｋ的褪色反应及其动力学条件，建立了一种高灵敏，高选择测定痕量铁的新方法，可测定０－０．０２μｇ／ｍｌ范围内的铁。已用于天然水中痕量铁的测定。     

地质样品中痕量碘的热解——示波极谱法测定

提出了在１０００℃高温中热解地质样品,以５ｇ／Ｌ ＮａＯＨ溶液为吸收液,以１０％ＮＨ３·Ｈ２Ｏ－３６ｇ／Ｌ ＮＨ４Ｃｌ溶液－２０ｇ／Ｌ Ｎａ２Ｂ４Ｏ７·６Ｈ２Ｏ溶液－１６ｇ／Ｌ Ｎａ２ＳＯ３溶液为底液,用二阶导数示波极谱测量痕量碘。方法的检出限为０．０８μｇ／ｇ,精密度（ＲＳＤ）为５．５％。经地质标准物质验证,测定值与推荐值吻合。     

析相萃取光度法测定地质样品中痕量钯

研究了表面活性剂加醇析相对钯硫代米蚩酮络合物的萃取行为,建立了痕量钯的光度测定方法。析相对Ｐｄ的萃取回收率为９９５％,富集倍率为２５。络合物的λｍａｘ＝５３０ｎｍ,形成后至少稳定２ｈ,ε达２６×１０６Ｌ·ｍｏｌ－１·ｃｍ－１,线性范围１４～４００μｇ／ＬＰｄ（Ⅱ）,检出限是１４μｇ／Ｌ,对于１０μｇ／ＬＰｄ测定１１次,计算相对标准偏差为４４％。方法已用于岩矿中痕量钯的测定,结果与推荐值吻合。     

流动注射－催化光度法测定痕量锰

在非离子表面活性剂吐温－８０存在的Ｈ３ＰＯ４介质中，Ｍｎ２＋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Ｍｎ２＋，该方法的检测波长为５５５ｎｍ，检出限为０．０２μｇ／ＬＭｎ，线性范围为０．０２～６μｇ／ＬＭｎ，进样频率为６０次／ｈ对５μｇ／ＬＭｎ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证方法可行并已用于水样中痕量Ｍｎ２＋的测定。     

二溴羟基苯基荧光酮光度法测定锌

在ｐＨ１１４的Ｎａ２ＨＰＯ４ＮａＯＨ缓冲介质中,表面活性剂溴化十六烷基吡啶（ＣＰＢ）及ＴｒｉｔｏｎＸ１００存在下,锌与二溴羟基苯基荧光酮发生显色反应,生成的络合物最大吸收波长在６１０ｎｍ处,摩尔吸光系数１７８×１０５Ｌ·ｍｏｌ－１·ｃｍ－１。ＮａＰＯ３的存在可提高方法的灵敏度与选择性。比尔定律范围是０～３２０μｇ／Ｌ,可不经分离直接测定硫铁矿中锌。对硫铁矿中ｗ（Ｚｎ）为００２％或０４％的样品进行６次平行测定,其ＲＳＤ为１６３％～５３％。     

催化动力学光度法测定痕量钛的研究

在氨性介质中,痕量Ｔｉ（Ⅳ）催化ＫＩＯ４氧化靛红的褪色反应。褪色程度与Ｔｉ（Ⅳ）的浓度在０～８μｇ／Ｌ线性相关;对于靛红褪色反应为零级,对于Ｔｉ（Ⅳ）该反应为一级;测定该反应的表观活化能为７０４５ｋＪ／ｍｏｌ;反应速率关系式是－ｄＣＲ／ｄｔ＝ＫＣＴｉ。基于该反应,建立测定痕量Ｔｉ的方法,其检出限５０５×１０－９ｇ／Ｌ;ＲＳＤ（ｎ＝６）＜５２％,干扰可经伯胺Ｎ１９２３萃取分离消除。方法用于人发样中痕量Ｔｉ（Ⅳ）的测定,结果与极谱法相符。     

二安替比林间溴苯基甲烷—高碘酸钾体系动力学光度法测定钌

在Ｈ３ＰＯ４介质中,Ｒｕ（Ⅲ）对ＫＩＯ４氧化二安替比林间溴苯基甲烷（ＤＡｍＢＭ）的显色反应有明显的催化作用。基于此,建立了测定痕量钌的催化分光光度分析法,并且测定了一些动力学参数。方法的检出限为２,３μｇ／Ｌ,钌的质量浓度在０￣１２μｇ／Ｌ符合比尔定律。方法已应用于矿样中痕量钌的测定,５次测定的ＲＳＤ〈５％,加标回收率在９６￣１０１％。     

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.     

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.)     

GEOCHEMISTRY

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