化探样品中钽的测定分光光度法

测定Ta的方法有很多,比如结晶紫法,该法的灵敏度低,检出限达不到化探样品的要求;乙基紫法,灵敏度虽高,但稳定性相当差,不适合成批化探样品的检测.本文采用钽钼酸与丁基罗丹明B在聚乙烯醇存在下形成水溶性缔合物光度法测定化探样品中的Ta[1],其表观摩尔吸光系数为1.39×106 L·mol·cm-1, 灵敏度高,稳定性好,并且在水相中测定,适合化探样品中痕量Ta的测定. 1 实验仪器及试剂 UV─250 (日本岛津); 10 μg穖L-1标准溶液:准确吸取100μg·mL-1 Ta2O5标准储备液(63 g/L酒石酸介质)10.0mL于100 mL容量瓶中,用4 mol· L-1 KOH溶液稀释定…     

钽钼杂多酸—碱性染料多元缔合物体系的研究

在PVA、OP或Tween-60存在下,采用平衡移动法确定了碱性染料亚甲基蓝、耐尔蓝(NB)、罗丹明B(RB)、丁基罗丹明B(BRB)、结晶紫(CV)、乙基紫(EV)与Ta的摩尔比是1:1至7:1;考察了NB(或BRB)-钽钼杂多酸缔合物的红外光谱,初步探讨了反应机理:比较了几个碱性染料-钽钼杂多酸缔合物体系的光度特性,筛选出两个摩尔吸光系数>2×10~6的分析体系,并用于合金钢和地质标样中痕量Ta的测定,方法可行。     

铊—硫氰酸盐—乙基紫高灵敏显色反应及应用研究

在聚乙烯醇(PVA)存在下,Tl(SCN)_4~-与乙基紫形成离子缔合物。适宜酸度为0.12—0.36mol/L H_2SO_4,λ_(max)为560 nm,ε为1.12×10~6L·mol~(-1)·cm~(-1),Tl在0—10μg/25 ml范围服从比耳定律。考察了40多种共存物质影响,大多数元素不干扰。方法简单、快速,已用于某些岩矿中Tl的测定。     

钼—AAAQ体系吸附波的极谱法研究

在pH4.1-4.5的HAc-NaAc底液中,Mo(Ⅵ)与5-(4-安替比林偶氮)-8-氨基喹啉(AAAQ)形成1:1的离子缔合物。该缔合物吸附于滴汞电极上于-1.32V(υs.SCE)处产生一灵敏的极谱峰,峰电流与Mo(Ⅵ)浓度在8 ×10~(-4)-8×10~(-2)μg/ml范围内呈线性关系。研究了极谱波性质、缔合物的结构及电极反应过程和机理。应用本法测定了铜钼矿中Mo。     

新显色剂5—（4—溴苯偶氮）—8—羟基喹啉与钴（Ⅱ）显色反应的？…

研究了新显色剂 5 -(4-溴苯偶氮 ) -8-羟基喹啉 (BAHQ)与钴 (Ⅱ )形成配合物的条件。试验表明 ,该显色剂的离解常数pKa1 ,pKa2 分别为 1.80 ,7.90。BAHQ与钴 (Ⅱ )形成配合物的最大吸收峰在 483nm处。钴 (Ⅱ )浓度在 0～ 16 μg/ 2 5mL范围内符合比耳定律 ,表观摩尔吸光系数ε483 =5 .10× 10 4L·mol- 1 ·cm- 1 ,对比度△λ =88nm。考查了二十多种离子的干扰情况 ,用于测定维生素B1 2 药品中的钴 ,结果满意     

红十字湖地区锂云母-透锂长石伟晶岩脉中锡锰钽矿的发现

锡锰钽矿(wodginite)理想式为MnSnTa2O8,Z=4,其结构为锡铁钽矿(ixiolite)结构的有序化形式。它是钽的主要工业矿物,是高度分异演化伟晶岩的标志矿物之一。在加拿大红十字湖地区锂云母-透锂长石伟晶岩脉中发现了这一钽矿物。矿物为黑褐色,呈半自形,颗粒达0.2mm,分布于由锂云母钠长石构成的条带中,与之共生的是一套典型的、高演化的花岗伟晶岩矿物组合。锡锰钽矿具有Mn/Fe、Sn/Ti、Ta/Nb比值高,杂质少的特点。矿物平均分子式为:Mn1.00(Sn0.64Ta0.24Ti0.04Mn0.04Zn0.02Fe0.01)0.99(Ta1.69Nb0.31)2.00O8;晶胞参数a=0.9534nm,b=1.1482nm,c=0.5123nm,β=91°07',V=0.5607nm3。依据矿物β>91°、V>0.560nm3、对偶面网221与221具强分裂衍射双峰、I021/I220为0.19和Mn/(Fe+Mn)≈1等特征,在锡锰钽矿与锡铁钽矿所构成的同质多像、有序-部分有序-无序这样一个连续系列中,本区所产锡锰钽矿属有序端员矿物,其阳离子在八面体中分布的有序度约为95%。在钽资源的寻找和开发利用中,应重视含锡锰钽矿的锂云母-透锂长石伟晶岩脉。     

3,3-二甲基-2-[4-(N-甲基-N-氯乙基)胺基苯乙烯]吲哚萃取光度法测定矿石中痕量金

本文研究了金与3,3-二甲基-21[4-(N-甲基-N-氯乙基)胺基苯乙烯]吲哚的显色反应,确定了用苯萃取有色缔合物的最佳条件。在0.25mol·L~(-1)硫酸介质中,溴化钠存在下,以苯萃取溴金酸根离子与显色剂的缔合物,于555nm处有最大吸收,其表观摩尔吸光系数ε_(555)=7.3×10~4L·mol~(-1),金含量为0—7μg/5ml苯时符合比尔定律。用于矿样分析,其结果令人满意。     

碱性红13分光光度法测定氰化物浸出液中金(Ⅰ)的研究及应用

本文研究和确定了碱性红13显色、乙酸异戊酯萃取光度法,直接测定氰化物浸出液中金(I)的条件和方法。Au(CN)_2离子与显色剂形成1:1的离子缔合型配合物被乙酸异戊酯萃取,在有机相中至少稳定22h,配合物在540nm波长处有最大吸收,表观摩尔吸光系数ε_((?)40)=4.4×10~4L·mol~(-1)·cm~(-1)。金含量在0～20ug/5ml乙酸异戊酯范围内符合比尔定律。方法具有简便、快速、重现性好、毒性较小、成本低、实用性较强等优点,用于金矿浸出液的分析,结果令人满意。     

南天山库勒湖蛇绿岩形成环境及构造意义——基性熔岩的地球化学证据

南天山库勒湖蛇绿岩具有两组不同地球化学类型的基性熔岩。第1组熔岩的∑REE=24×10-6~28·36×10-6,(La/Yb)N=0·35~0·37,Zr/Nb=39·91~95·12,Ta/Nb=0·07~0·09,εNd(t)=8·85~12·25,暗示其源区类似于MORB(但比后者更加亏损);同时,该组熔岩的LILE明显富集,HFSE(尤其Nb、Ta)强烈亏损,显示出与岛弧拉斑玄武岩(IAT)的亲源性。第2组熔岩的∑REE(56·38×10-6~101·29×10-6),(La/Yb)N值(0·96~1·36),不相容元素含量等介于E_MORB和OIB之间(更接近于E_MORB),并且Nb、Ta显示正异常;εNd(t)=8·39,Zr/Nb=9·74~10·94,Ta/Nb=0·06,与E_MORB相当,暗示其源区比第1组熔岩相对富集。综合分析两组基性熔岩的地球化学特征,认为它们的形成环境为弧后盆地,第1组熔岩为弧后盆地初始张开阶段受消减带流体沉积物影响的强烈亏损的残余地幔源区发生部分熔融作用的产物,第2组熔岩是由于弧后进一步的次级地幔对流驱动周围或深部相对富集的地幔向处于引张部位的弧后注入或上涌、发生部分熔融作用的产物。库勒湖弧后盆地型蛇绿岩的形成时代与古南天山洋的俯冲消减时代相当,它的形成很有可能与该洋盆晚末志留世—早泥盆世期间的俯冲消减作用(诱发弧后拉张)有关。     

meso-四(对-三甲铵基苯基)卟啉与铋显色反应的研究

研究了在催化剂苯羟乙酸的存在下,me so-四(对-三甲铵基苯基)卟啉与Bi(Ⅲ)的显色反应。在pH 5.7的HAc-NaAc介质中,于沸水浴中反应5min完成,配合物的最大吸收波长为464mn,表现摩尔吸光系数为3.15×10~5L·mol~(-1)·cm~(-1),Bi(Ⅲ)含量在0～0.48μg/ml范围内呈线性关系,配合物的组成为Bi(Ⅲ):T(4-TAP)P=2:3。方法可用于矿样中痕量Bi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.     

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