铅的氢化物原子吸收光谱法的研究及地球化学样品中铅的测定

本文采用电加热石英管原子化器,对铅的氢化物原子吸收光谱法的基本条件进行了系统地研究.文中着重对铅的氧化剂及测定体系、共存元素的干扰及其消除作了详细地考察,并对氧化机理及干扰机理作了初步探讨.选定了铁氰化钾为氧化剂、邻菲罗啉——硫氰酸钾——草酸为干扰抑制剂的测定体系.拟定的方法在283.3nm线测得铅的灵敏度为0.10ng/ml/1%吸收,对于10ng/ml的铅其相对标准偏差为4.9%,样品分析结果满足误差要求.是地球化学样品中0.00005%以上铅的有效测定方法.     

邻菲罗啉分光光度法测定地热水中的总铁含量

本文介绍的是邻菲罗啉分光光度法测定地热水中总铁含量的条件实验。     

邻菲罗啉分光光度法测定铁的四种还原剂的比较

比较了抗坏血酸,盐酸羟胺,盐酸肼和亚硫酸钠四种还原剂在邻菲罗啉分光光度法测定铁中的作用,证实抗坏血酸是最好的一种还原剂,使体系有很强的抗氧化性能和抗络合能力。     

邻菲罗啉对蒙脱石吸附性的影响

为了提高蒙脱石对大分子物质的吸附性,利用邻菲罗啉可与过渡金属离子形成配合物的性质,用两种方法对蒙脱石加以改性。通过测定改性蒙脱石对染料的脱色性及分析XRD图,研究邻菲罗啉的配合物的生成方式对蒙脱石层间结构及吸附性能的影响,并探讨了改性蒙脱石的热稳定性。结果表明,邻菲罗啉能够进一步撑开层间含有过渡金属离子的蒙脱石片层,使层间距明显增大到1.76nm以上;采用过渡金属离子为先驱体,先插入蒙脱石层间、再原位生成配合物的两步法能获得既增大层间距、又提高有序度的良好效果;改性蒙脱石在400℃以下具有很好的热稳定性。     

蒙脱石的电动电位调控及其对重金属离子吸附性能的影响

为了提高蒙脱石对水体中的Cr3+、Ni2+、Cu2+等重金属离子的净化效率,用各种金属离子、聚合羟基铝离子、十六烷基三甲基溴化铵及邻菲罗啉的螯合物等插层蒙脱石,调控其电动电位,研究了改性蒙脱石的电动电位与吸附金属离子性能的关系,探索了pH值及金属离子浓度对吸附性能的影响。结果表明:蒙脱石经不同物质改性后,电动电位发生了不同程度的变化,其中聚合羟基铝离子,十六烷基三甲基溴化铵及邻菲罗啉螯合物的插层,使蒙脱石的电性从负值变为正值,不利于对带正电的金属离子的吸附。利用重金属离子的配位性,先在含有重金属离子的溶液中加入邻菲罗啉,使其生成螯合物,再用蒙脱石进行吸附,能显著改善吸附性能,这一方法不仅提高了对低浓度的金属离子的吸附性能,而且由于氢键和范德华力起主要作用,使得吸附性基本不受溶液pH值的影响。     

银—邻菲罗啉—对溴苯酚若丹宁显色反应的研究及应用

研究了在ＰＶＡ１２３４－ＴｒｉｔｏｎＸ－１００协同作用下,Ａｇ＾＋与对溴苯酚若丹宁－邻菲罗啉的显色反应条件,结果表明,在ＰＨ４．０的ＨＡｃ－ＮａＡｃ缓冲体系中Ａｇ＾＋与对溴苯酚若丹宁－邻菲罗啉生成稳定的红色三元络合物。     

催化光度法测定痕量铁的新指示反应研究

研究了在表面活性剂胶束增溶增敏下，以邻菲罗啉为活化剂，痕量铁催化抗坏血酸还原２－羟基－４－溴苯基氮氨基偶氮苯的褪色反应及动力学条件，探讨了反应机理，建立了高选择性测定痕量铁的新方法，本法线性范围０－０．０３２μｇ／ｍｌ，检出限为８．７×１０＾－１０ｇ／ｍｌ。已用于人发等样品中痕量铁的测定。     

邻菲啰啉光度法测定高岭土中可溶铁和非可溶铁

高岭土中铁的赋存状态和含量影响其白度和增白效果,因此快速准确地测定高岭土中不同种类的铁含量具有实际应用意义。高岭土中自由铁和结构铁定量分析困难,为此本文将高岭土中的铁分为可溶铁和非可溶铁两类。高岭土经盐酸酸溶处理后溶液中的铁含量为可溶铁含量,经氢氧化钠碱熔处理后溶液中的铁含量为总铁含量,非可溶铁含量由总铁含量减去可溶铁含量计算得出。采用邻菲啰啉光度法测定溶液中的铁含量,该方法的相对标准偏差小于5%,加样回收率范围在95%～105%,最低检测含量为1.06μg/g。高岭土中的其他元素对铁的测定均没有干扰。所测得的可溶铁为大部分自由铁和少数结构铁。通过对高岭土中的可溶铁进行定量分析,可得知漂白工艺中可除去的最大铁含量。     

铌钽矿物中亚铁和全铁连续测定

影响邻菲啰啉比色测定亚铁的主要因素是亚铁在显色、溶矿过程中易被氧化及高铁的严重干扰。本实验认为逐个显色、缩短显色过程是防止氧化的关键,而与温度关系不大。本方法采用NH_4F或HBF_4作溶剂,以SiO_2粉作排气保护,采取逐个显色防止亚铁氧化。高铁则选用氢醌作还原剂。经过生产考验适用于硅酸盐、铌钽矿和钨锡矿中亚铁和全铁的测定。 一、试剂 邻菲啰啉 0.13％水溶液(贮于暗色瓶中,不超过一周)。 醋酸缓冲溶液 100g醋酸铵溶于100ml水中。 显色剂 上述缓冲溶液与邻菲啰啉溶液按7∶3混合(现用现配)。 混合络合剂 含酒石酸铵24％,硼酸10％(用时配制)。     

邻菲啰啉与铬的极谱行为的研究及应用

在氨性介质中,邻菲啰啉与Cr(Ⅵ)有一峰电流较大的催化波,Cr(Ⅵ)浓度在0.006～0.16μg/ml范围内与峰电流呈线性关系,检测限为7.7×10~(-8)mol/L,该法可用于矿石和水样中Cr的测定。     

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.     

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     

OCEANOGRAPHY & MARINE GEOLOGY

正20140582 Fang Xisheng(Key Lab.of Marine Sedimentology and Environmental Geology,First Institute of Oceanography,State Oceanic Administration,Qingdao 266061,China);Shi Xuefa Mineralogy of Surface Sediment in the Eastern Area off the Ryukyu Islands and Its Geological Significance(Marine Geology Quaternary Geology,ISSN0256-1492,CN37     

ENVIRONMENTAL GEOLOGY

正20141810 Bian Yumei(Geological Environmental Monitoring Center of Liaoning Province,Shenyang 110032,China);Zhang Jing Zoning Haicheng,Liaoning Province,by GeoHazard Risk and Geo-Hazard Assessment(Journal of Geological Hazards and Environment Preservation,ISSN1006-4362,CN51-1467/P,24(3),2013,p.5-9,2 illus.,tables,refs.)