应用HDEHP萃淋树脂萃取色谱分离快速测定矿石中微量铈组和钇组稀土

HDEHP萃淋树脂,其载体是苯乙烯二乙烯苯的共聚合物,固定相是HDEHP[即二-(2-乙基已基)—磷酸]。这种萃淋树脂的主要优点是萃取容量较大、有机固定相不易脱落、洗脱曲线形状良好,但能否用于矿石中稀土元素的分组,尚未见有报导。本实验选用此种萃淋树脂,以不同浓度的盐酸为流动相,进行了铈组、钇组稀土的分离洗脱条件试验。然后分别加大掩蔽剂,直接用光度法测定各组稀土。     

应用HDEHP萃淋树脂萃取色谱分离快速测定矿石中微量铈组和钇组稀土

HDEHP萃淋树脂,其载体是苯乙烯二乙烯苯的共聚合物,固定相是HDEHP[即二-(2-乙基已基)—磷酸]。这种萃淋树脂的主要优点是萃取容量较大、有机固定相不易脱落、洗脱曲线形状良好,但能否用于矿石中稀土元素的分组,尚未见有报导。本实验选用此种萃淋树脂,以不同浓度的盐酸为流动相,进行了铈组、钇组稀土的分离洗脱条件试验。然后分别加大掩蔽剂,直接用光度法测定各组稀土。标准回收试验及矿石分析质量符合地质要求。铈组稀土回收率为98.8-109％,钇组稀土回收率为93.7-102％。     

PMBP-苯溶剂萃取-ICP-AES快速测定化探样品中15种稀土元素和钍

实验在pH=5.5的酸度下,使用PMBP-苯溶剂定量萃取化探样品中15种稀土元素和钍,然后用甲酸-8-羟基喹啉溶液反萃取稀土元素并在萃取后的有机相中再用50%盐酸反萃取钍,分离后ICP-AES同时测定的新方法。成功解决了盐酸、硝酸、氢氟酸、高氯酸消解后ICP-AES直接测定稀土元素基体成分复杂,质谱干扰严重,方法检出限高等问题,试样用过氧化钠-氢氧化钾熔融后,水提取,过滤,滤渣酸溶,经过沉淀和溶剂萃取等分离富集,对稀土组份进行全分析。其检出限为0.003μg/ml~0.068μg/ml,相对标准偏差(RSD)0.6%~2.0%,准确度及精密度符合国家及行业规范要求。采用建立的方法测定稀土铌钽矿中的稀土元素及钍,结果满意且具有实际应用价值。     

铝土矿中稀土总量的测定——PMBP-醋酸丁酯萃取偶氮胂Ⅲ光度法

矿石中微量稀土总量的分离测定一般采用离子交换法、纸上色层法、反相萃取色层法、溶剂萃取法,沉淀分离法、缓冲掩蔽法等但以溶剂萃取法较为简便快速。其中尤以PMBP—苯应用最为广泛,由于苯是有害物质,故本文研究PMBP—醋酸丁酯萃取分离微量稀土总量的体系,并对萃取分离条件,偶氮胂Ⅲ显色条件,氢氧化物共沉淀分离条件进行了探讨,制定了铝土矿中微量稀土总量的测定方法。本法测定范围RE_2O_30.02～0.2％。     

高温高压离子交换法分离提取单一高纯稀土

本文研究了高温高压离子交换法分离稀土时,排代剂浓度、ＰＨ值、线性流速和柱温等因素对分离效果的影响,本方法在分离多元稀土富集和及稀土精料时,具有工艺简单、质量稳定、分离时间短、产品纯度高、成本低廉等特点,为单一高纯稀土生产开辟了一条新路。     

电热石墨炉原子吸收法测定岩石矿物中痕量铊

地质样品中微量铊的分析,常采用有机试剂萃取分离后,进行比色法测定,其分析手续较繁、灵敏度低。近年来,随着原子吸收分析技术的发展,使用石墨炉原子吸收法测定痕量铊已有报导,也有用钒作为基体改进剂测定矿石中痕量镓、铟、铊。本文提出在盐酸-碘化钾-抗坏血酸介质中,用甲基异丁基甲酮(MJBK)萃取铊,不加基体改进剂,直接用自制的简易石墨炉平台测定有机相中的铊。     

MIBK-HBr体系萃取分光光度法测定镓铟铊

萃取分离测定同一样品中镓、铟和铊的工作,国内外近年来都有研究。本文在A.E.HuberT等工作的基础上提出,在氢溴酸介质中,以甲基异丁基甲酮(MIBK)为萃取剂,甲苯为稀释剂,调节水相酸度,分步萃取,有机相直接显色分光光度法测定同一样品浸提液中镓、铟和铊。该方法的特点是分步萃取后,有机相既不经反萃取也不经蒸干,直接用分光光度法进行测定,具有简便,准确的优点并成功地应用于矿样分析。 实验 1.仪器及试剂 721分光光度计(上海第三分析仪器厂) 氢溴酸 分析纯40％约为7mol/L(用时可进行标定)。     

萃取色谱分离—电感耦合等离子体质谱法测定高纯氧化铽中痕量稀土杂质的研究

考察了源于基体Ｔｂ的多原子离子质谱干扰及基体Ｔｂ对稀土杂质测定信号的影响,研究了Ｐ５０７－ＨＣｌ萃取色谱体系分离高纯Ｔｂ４Ｏ７基体与痕量稀土杂质的条件,采用Ｒｅ内标补偿直接测定与分离基体后测定相结合的方式,建立了分析高纯Ｔｂ４Ｏ７中痕量稀土杂质电感耦合等离子体质谱（ＩＣＰ－ＭＳ法,检出限为５￣２１ｎｇ／Ｌ,加标加以经为９０％￣１０９％,３次测量的相对标准偏差为１．３％￣６．５％,分离周期近９ｈ。方     

萃取色谱分离-电感耦合等离子体质谱法测定高纯氧化铽中痕量稀土杂质的研究

考察了源于基体Ｔｂ的多原子离子质谱干扰及基体Ｔｂ对稀土杂质测定信号的影响,研究了Ｐ５０７ＨＣｌ萃取色谱体系分离高纯Ｔｂ４Ｏ７基体与痕量稀土杂质的条件,采用Ｒｅ内标补偿直接测定与分离基体后测定相结合的方式,建立了分析高纯Ｔｂ４Ｏ７中痕量稀土杂质的电感耦合等离子体质谱（ＩＣＰＭＳ）法,检出限为５～２１ｎｇ／Ｌ,加标回收率为９０％～１０９％,３次测量的相对标准偏差为１．３％～６．５％,分离周期近９ｈ。方法可用于纯度（质量分数,ｗ）为９９．９９％～９９．９９９９％的Ｔｂ４Ｏ７中痕量稀土杂质的分析。     

光谱样品中银的测定

样品经酸溶后,加碘化钾,银以AgI方式存在,有机试剂萃取分离,用原子吸收分光光度计测定有机相中银的含量,测定范围(1~1 000)×10-9。     

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.)