测定微量铬(VI)的新方法--邻氯苯基荧光酮荧光熄灭法

基于Cr(Ⅵ）－邻氯苯基荧光酮（O－Cl-PF)-CTMAB体系的荧光熄灭效应，提出了一种测定痕量铬（Ⅵ）的新荧光方法。在pH=8.3的NH4Cl-NH3H2O介质中，该物的最大激发波长和发射波长分别是400nm和 550nm。铬（Ⅵ）量2－48μg/L[0.05-1.2μg/(25mL)]范围内与相对荧光强度ΔF呈线性关系，检出限为1μg/L。该方法可用于电镀废液、湖水、矿石中痕量铬（Ⅵ）的直接测定。     

邻氯苯基荧光酮—CTMAB荧光熄灭法测定痕量锡

本文研究了在溴化十六烷基三甲铵存在下,锡与邻氯苯基荧光酮(O-Cl-PF)形成三元配合物导致邻氯苯基荧光酮的荧光熄灭。结果表明:在pH3.8—4.5的NaAc/HCl介质中,产生荧光熄灭程度最大的激发波长为λ_(ex)=530nm,荧光波长为λ_(em)=550nm,当锡含量在20—120ppb范围内与荧光熄灭程度呈线性关系,藉以测定痕量锡。方法简便,稳定性好,应用于地质和合金样品中痕量锡的测定取得了令人满意的结果。     

二溴羟基苯基荧光酮荧光熄灭法测定铝的研究及应用

在ｐＨ６．５的ＨＡｃ－ＮａＡｓ介质中,Ｔｒｉｔｏｎ－Ｘ－１００存在下,铝与二溴羟基羟基苯基荧光酮形成１：３的紫色络合物使二溴羟基苯基荧光酮的荧光熄灭。络合物的λｅｘ＝６２ｎｍ,λｅｍ＝６５２ｎｍ,铝含量在０－１２０μｇ／Ｌ范围内与ΔＦ呈线性关系,相关系数λ＝０．９９９６,检测限０．４μｇ／Ｌ,以此建立了测定微量铝的新方法,方法用于岩石矿物以及茶叶,人发和水样中微量铝的测定,结果满意。     

2,4—二甲氧基苯基荧光酮在混合表面活性剂存在下荧光熄灭法测定痕量锡

研究了在舔生剂溴化十六烷基三甲铵和聚氧乙烯十二烷基醚存在下,锡与２,４－二甲氧基苯基荧光酮的荧光熄灭体系,在ｐＨ７．０２￣７．９６的盐酸－三乙醇胺介质中,λｅｘ＝４００ｎｍ,λｅｍ＝５５０ｎｍ,体系产生的荧光熄灭程度最大,锡量的线性范围为：０￣２０μｇ／Ｌ,检出限为０．９７μｇ／Ｌ,方法用于测定钢材及铝合金中的痕量锡,结果满意。     

流动注射荧光法测定微量铝

基于β-环糊精-丙酮能加速与增敏Al-钙黄绿素的荧光反应,建立了流动注射荧光法测定中草药中微量Al的新体系(Al-Calcein-β-CD-丙酮)。荧光最大激发波长和发射波长分别为478.0nm和509.6nm。Al~(3+)浓度在0～3.5μg/ml范围内标准曲线呈线性;检出限0.037μg/ml。方法已用于测定中草药中微量Al,RSD在1％以下;回收率在97％～105％范围;进样频率140次/h。     

2,4—二甲氧基苯基荧光酮荧光熄灭法测定铜

研究了在Ｔｗｅｅｎ８０存在下,２,４－二甲氧基苯基荧光酮与铜的配合物的荧光熄灭体系,在ｐＨ为８．０￣８．８的Ｎａ２ＣＯ３－Ｈ３ＢＯ３＋ＫＣｌ缓冲介质中,在λｅｘ＝４００ｎｍ,λｅｍ＝５１０ｎｍ其体系产生的荧光熄灭程度最大。铜的线性范围为０￣２０μｇ／Ｌ。方法的检测限为０．７２μｇ／Ｌ。     

邻氯苯基荧光酮与过氧化氢荧光熄灭法测定痕量钛

钛（Ⅳ）与邻氯苯基荧光酮－－过氧化氢形成混合配合物使邻氯苯基荧光酮的荧光熄灭。在ｐＨ３．９的ＮａＡｃ－ＨＣｌ介质中，λｅｘ＝５３０ｎｍ、λｅｍ＝５５０ｎｍ荧光熄灭程度最大。线性范围为０－８０μｇ／Ｌ，检出限为０．７６ｎｇ／ｍｌ。共存离子经阴离子交换树脂分离后可用于地质样品中痕量钛的测定。     

Hg~(2+)-碘化物-番红花红T缔合体系褪色光度法测定微量汞

在0.01 mol/L硫酸介质中,Hg2+与过量I-和番红花红T(ST)反应生成稳定的离子缔合物[ST]2[HgI4],使ST褪色,据此建立了褪色光度法测定微量汞的方法。最大褪色波长为519 nm,体系的褪色程度与Hg2+浓度在0~1.35μg/mL内呈线性关系,表观摩尔吸光系数为1.24×105L/(mol.cm),检出限为2.26μg/L。采用巯基棉富集分离,测定河水中的微量汞,方法相对标准偏差(RSD,n=5)为1.2%~1.7%,回收率为98.3%~102.6%。     

钌(Ⅱ)-邻菲啰啉-十二烷基硫酸钠体系荧光光度法的研究

在pH5.5—6.5的介质中Ru(Phen)_3~(2+)与十二烷基硫酸钠形成1:2的荧光配合物。其λex=437.0nm,λem=617`0nm。荧光法测定钌的检测限为0.4ng/ml,浓度范围是0.4ng国、—2.0μg/ml。用于合成试液中钌的测定相对标准偏差为5.6％(n=6)。     

偶氮溴膦-mk与钍的反应及其应用

在0.05—1.28N的硝酸介质中钍同偶氮溴膦-mK反应,形成蓝紫色络合物。络合物稳定48小时,λ_(max)=680nm,△λ=130nm,ε=8.55×10~4,钍在0—30μg/25ml范围符合比尔定律。当体系中加入阳离子表面活性剂TPB后灵敏度至少提高三倍,钍在0—5μg/25ml范围内符合比尔定律,可用于微量钍的测定。     

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.     

Late Wuchiapingian (Late Dzhulfian,early Late Permian) limestone olistolites within the Tertiary flysch of Glypia Unit (Mount Parnon,central–eastern Peloponnesus,Greece)

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.     

PALEONTOLOGY

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.)     

GEOCHEMICAL EXPLORATION

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.)     

MICROPALAEONTOLOGY

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.)     

PETROLOGY

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.,     

ENVIRONMENTAL GEOLOGY

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     

PROSPECTING EXPLORATION

正20141266Fan Chaoyan(Guangdong Provincial Key Laboratory of Mineral Resources and Geological Processes,Guangzhou 510275,China);Wang Zhenghai On Error Analysis and Correction Method of Measured Strata Section with Wire Projection Method(Journal of