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光度法测定痕量钛的研究 总被引:6,自引:1,他引:6
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24~24μg/L,检出限为106×10-7g/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11%~20%。 相似文献
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井间电阻率层析成象是一种探测地下浅部精细结构的物探方法,它主要用于解决工程地质问题。本文采用2.5-D有限元法,针对井间电阻率层析成象中的AM观测系统进行了反演成象计算。文中首先计算了灵敏度矩阵,然后给出了一种电阻率层析成象反演算法—平滑度约束反演,理论模型的计算和实际资料的处理,都证明了该算法的有效性 相似文献
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DEPAQ分光光度法测定茶叶中微量锰 总被引:1,自引:0,他引:1
本研究了5-(4-二乙氨基苯偶氮)-8-羟基喹啉(DEPAQ)与锰(Ⅱ)的显色反应,在斐了子型面表面活性剂TritonX-100存在下,pH8.5的缓冲介质中,锰(Ⅱ)与DEPAQ形成1:2的红色配合物,最大吸收波长为530nm,表现摩尔吸光系数ε=7.3×10^4L.mol^-1.cm^-1,锰量在0~20μg/25mL范围符合比尔定律,试验了常见阴阳离子的干扰情况,本法用于茶叶微量锰的测定, 相似文献
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在0.2mol/L HCl-1.0mol/LNaCl-0.15mol/L抗坏血酸介质中,用电流氧化微分溶出计时电位法直接测定地质物料中微量Cu。富集电位-0.55V,时间20~40s;电极转速2500r/min;溶出电流0.2~1μA;记录电位范围-0.2~-1.20V;清洗电位-0.10V,时间10s。方法检出限0.2μg/g,线性范围2~400ng/ml,精密度(RSD,n=11,4.1μg/ 相似文献
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镍与邻羧基苯基重氮氨基偶氮苯的显色反应及其应用 总被引:6,自引:0,他引:6
在乳化剂OP存在下,于pH9.7~10.0的Na_2B_4O_7-NaOH缓冲介质中,Ni ̄(2+)与邻羧基苯基重氮氨基偶氮苯(CDAA)形成组成比为1:2的稳定的红色配合物,其吸收峰波长在540nm,对比度△λ=126nm,表观摩尔吸光系数为1.99×10 ̄5L·mol ̄(-1)·cm ̄(-1),室温下20min内显色反应完全,有色配合物至少稳定12h。方法线性范围是0~0.20μg/mlNi,检测限为0.0004μg/ml。在掩蔽剂存在下,方法用于矿样和低合金钢的分析,结果与标准值相符,其RSD(n=6)分别为1.8%和3.1%,标准加入回收率为95.0%~101.2%。 相似文献
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研究了酚(phen)-Cu-水杨酸(H2sal)和四乙基碘化铵(Et4NI)的四元体系中微分电位溶出分析法(DPSA)测定痕量酚。在pH为7.0的介质中,phen-Cu-H2sal的配合物抑制了Cu在玻炭电极上的还原富集,降低Cu的微分电位溶出峰(Δdt/dE),且0.4~200μg/L的酚与Δdt/dE呈线性关系。加入Et4NI使检测灵敏度提高2.75倍。天然水样经GDX-502树脂吸附分离富集后,除去了吡啶、苯胺等物质的干扰。NaOH洗脱,预电解富集3min,酚的检出限为0.2μg/L;实验测定20μg/L的酚,相对标准偏差为2.7%(n=11);标准加入回收率为88.10%~113.20%。方法用于天然水中痕量酚的测定,结果与4-氨基安替比林分光光度法结果符合。 相似文献
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在pH56~64的缓冲介质中,Sc(Ⅲ)埃铬菁R(ECR)氯化十六烷基吡啶(CPC)乳化剂OP形成蓝色配合物,其组成比nSc∶nECR∶nCPC=1∶2∶2。配合物的最大吸收波长在610nm处,表观摩尔吸光系数为171×105L·mol-1·cm-1。Sc质量浓度为0~024mg/L时遵守比尔定律。拟定的方法结合PMBP萃取分离,测定钨矿及其浸出渣中的微量Sc,可获满意结果 相似文献
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298K时三元体系K^+/CO3^2—,B4O7^2——H2O和Li^+/CO3^2—,B4O7^2——H2O相关系 总被引:2,自引:0,他引:2
研究了二个三元体系Li+/CO2-3,B4O2-7H2O(1)和K+/CO2-3,B4O2-7H20(2)298K时的相平衡关系和平衡液相的物化性质(密度、折光密、粘度、电导率、pH值)。研究表明:这二个三元体系均属简单共饱型,无复盐或固溶体形成。体系(1)的两段溶解度曲线对应于无水Li2CO3和Li2B4O7·3H2O结晶区,体系(2)的两段溶解度曲线对应于K2CO3·3/2H2O和K2B4O7·4H2O结晶区。 相似文献
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Gilles Serge Odin 《Comptes Rendus Geoscience》2002,334(6):409-414
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. 相似文献
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Emmanuel Skourtsos Daniel Vachard Alexandra Zambetakis-Lekkas Rossana Martini Louisette Zaninetti 《Comptes Rendus Geoscience》2002,334(12):925-931
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. 相似文献
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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.) 相似文献
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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.) 相似文献
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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.) 相似文献
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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., 相似文献
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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 相似文献
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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 相似文献
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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 相似文献
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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.) 相似文献