共查询到20条相似文献，搜索用时 359 毫秒
1.
研究了在氯化十六烷基吡啶（ＣＰＣ）和乳化剂ＯＰ存在下，Ｍｇ与邻氯苯基荧光酮（ｏ－Ｃｌ－ＰＦ）的显色反应。在ｐＨ１２的碱性介质中，Ｍｇ（Ⅱ）与ｏ－Ｃｌ－ＰＦ形成１：３的蓝色配合物，其λ＿ｍａｘ＝６１２ｎｍ，表现摩尔吸光系数ε＿６１２＝１．３９×１０￣５Ｌ·ｍｏｌ￣－１·ｃｍ￣－１，Ｍｇ（Ⅱ）在０～０．２μｇ／ｍｌ范围内符合比尔定律。方法用于新陶瓷材料氮化硅（Ｓｉ＿３Ｎ＿４）中微量ＭｇＯ的测定，其结果与原子吸收光谱法相符。 相似文献
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钛—邻氯苯基荧光酮—Trutib X—100显色反应的研究及微量钛的测定 总被引：2，自引：0，他引：2
本文研究了在非离子表面活性剂Ｔｒｉｔｏｎｘ－１００存在的情况下，邻氯苯基荧光酮（Ｏ－Ｃｌ－ＰＦ）与钛的显色反应。试验表明，在０．１０～０．１４ｍｏｌ·Ｌ￣（－１）Ｈ＿２ＳＯ＿４介质中，Ｏ－Ｃｌ－ＰＦ与钛形成灵敏度极高的红紫色配合物，其最大吸收峰位于５４０ｎｍ处，表现摩尔吸光系数为１．８×１０￣５Ｌ·ｍｏｌ￣（－１）·ｃｍ￣（－１），钛含量在０～３μｇ／２５ｍｌ范围内服从比尔定律。该方法用样少，操作简便，灵敏度高，选择性好，适于测定地质样品中的微量钛。 相似文献
3.
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
4.
研究了新试剂２，４－二溴－６－羧基苯重氮氨基偶氮苯与Ｔｌ（Ⅲ）的高灵敏显色反应。在非离子表面活性剂ＴｒｉｔｏｎＸ－１００存在下，于ｐＨ１０．５的ＮＨ＿３·Ｈ＿２Ｏ－ＮＨ＿４Ｃｌ缓冲介质中，Ｔｌ（Ⅲ’）与该试剂生成红色配合物，其配合物的最大吸收波长位于５２０ｎｍ处，摩尔吸光系数为１．８３×１０￣５Ｌ·ｍｏｌ￣－１·ｃｍ￣－１。Ｔｌ（Ⅲ’）量在０～０．６４μｇ／ｍｌ范围内符合比尔定律。方法用于废水中痕量Ｔｌ的测定，结果与其它方法结果相符。测定工业废水及粉煤灰中痕量Ｔｌ的ＲＳＤ（ｎ＝６）在１．６％～３．２％范围。 相似文献
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N-间甲苯基-N′-(对氨基苯磺酸钠)硫脲与铜的显色反应及应用 总被引：1，自引：0，他引：1
研究了新试剂Ｎ－间甲苯基－Ｎ′－（对氨基苯磺酸钠）硫脲（ＭＭＰＴ）与Ｃｕ２＋的显色反应。结果表明,在ｐＨ４．６～５．６的ＨＡｃ－ＮａＡｃ介质中,Ｃｕ２＋与ＭＭＰＴ形成的配合物至少稳定５ｈ,其λｍａｘ＝３７０ｎｍ,表观摩尔吸光系数为１．１２×１０５Ｌ·ｍｏｌ－１·ｃｍ－１。Ｃｕ２＋的质量浓度在０．０８～１．４ｍｇ／Ｌ时符合比尔定律,相关系数ｒ＝０．９９９１。方法简便、快速,用于铅矿中铜的分析,测定结果与监控样推荐值相符,对ｗ（Ｃｕ）＝０．８％的试样测定６次,ＲＳＤ＝３．２％。 相似文献
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研究结果表明，在混合表面活性剂ＣＴＭＡＢ－吐温－６０存在下的ｐＨ５．７～６．５的缓冲介质中，Ｓｃ（Ⅲ）与４，５－二溴苯基荧光酮（ＤＢＰＦ）形成高灵敏的多元配合物，其ε＿（５９０）＝２．２６×１０￣５Ｌ·ｍｏｌ￣（－１）·ｃｍ￣（－１），组成比为：Ｓｃ：ＤＢＰＦ：ＣＴＭＡＢ＝１：２：４。采用混合表面活性剂使增溶增敏作用更为显著，并加速了显色反应，增强了配合物的稳定性。而Ｎａ＿２ＳＯ＿４的加入能显著地提高体系的灵敏度。Ｓｃ量在０～０．３６ｕｇ／ｍｌ范围内遵守比尔定律。方法可直接测定合成混合稀土中的Ｓｃ，回收率在９８％～１０５％；结合沉淀分离和ＰＭＢＰ萃取分离，实现了地质试样中痕量Ｓｃ的测定。 相似文献
9.
痕量银与meso－四（对－磺酸基苯基）卟啉显色反应的研究 总被引：4，自引：0，他引：4
研究了Ａｇ（Ｉ）与ｍｅｓｏ－四（对－磺酸基苯基）叶琳的光催化显色反应。在ｐＨｌ０的缓冲溶液中形成稳定的Ａｇ（Ｉ）－ＴＰＰＳ＿４－ＣＴＭＡＢ三元配合物，其最大吸收波长为４２６ｎｍ，组成为Ａｇ（１）ＴＰＰＳ＿４：ＣＴＭＡＢ＝１：１：２。表观摩尔吸光系数为２．７９×ｌ０￣５Ｌ·ｍｏｌ￣－１·ｃｍ￣－１，Ａｇ（１）的浓度在０～０．２μｇ／ｍｌ内符合比尔定律。基于此建立的测Ａｇ（Ｉ）方法灵敏度高，结合巯基棉分离干扰，可用于矿物中Ａｇ（Ｉ）的测定。 相似文献
10.
在０．１８～０．３２ｍｏｌ／ＬＨＣｌ介质中，Ｍｏ（Ⅵ）与３，４－二甲氧基苯基荧光酮（ＤＭＯＰＦ）和Ｔｗｅｅｎ－８０形成三元胶束配合物，最大吸收峰在５２６ｎｍ处，摩尔吸光系数为１．１６×１０￣５Ｌ·ｍｏｌ￣－１·ｃｍ￣－１，Ｍｏ（Ⅵ）含量在０～０．５３μｇ／ｍｌ范围内符合比耳定律。所建立的方法用于矿样中Ｍｏ的测定，结果较为满意。 相似文献
11.
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
12.
Inter-regional correlation of transgressions and regressions in the Cretaceous period 总被引：1，自引：0，他引：1
T. Matsumoto 《Cretaceous Research》1980,1(4):359-373
Well investigated platforms have been selected in each continent, and the history of Cretaceous transgressions and regressions there is concisely reviewed from the available evidence. The factual records have been summarized into a diagram and the timing of the events correlated between distant as well as adjoining areas.On a global scale, major transgressions were stepwise enlarged in space and time from the Neocomian, via Aptian-Albian, to the Late Cretaceous, and the post-Cretaceous regression was very remarkable. Minor cycles of transgression-regression were not always synchronous between different areas. Some of them were, however, nearly synchronous between the areas facing the same ocean.Tectono-eustasy may have been the main cause of the phenomena of transgression-regression, but certain kinds of other tectonic movements which affected even the so-called stable platforms were also responsible for the phenomena. The combined effects of various causes may have been unusual in the Cretaceous, since it was a period of global tectonic activity. The slowing down of this activity followed by readjustments may have been the cause of the global regression at the end of the Cretaceous. 相似文献
13.
The Afyon stratovolcano exhibits lamprophyric rocks, emplaced as hydrovolcanic products, aphanitic lava flows and dyke intrusions, during the final stages of volcanic activity. Most of the Afyon volcanics belong to the silica-saturated alkaline suite, as potassic trachyandesites and trachytes, while the products of the latest activity are lamproitic lamprophyres (jumillite, orendite, verite, fitztroyite) and alkaline lamprophyres (campto-sannaite, sannaite, hyalo-monchiquite, analcime–monchiquite). Afyon lamprophyres exhibit LILE and Zr enrichments, related to mantle metasomatism. 相似文献
14.
正20140751 Guo Xincheng(Geological Party,BGMRED of Xinjiang,Changji 831100,China);Zheng Yuzhuang Determination and Geological Significance of the Mesoarchean Craton in Western Kunlun Mountains,Xinjiang,China(Geological Review,ISSN0371-5736,CN11-1952/P,59(3),2013,p.401-412,8 相似文献
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正20141058 Chen Ling(Key Laboratory of Mathematical Geology of Sichuan Province,Chengdu University of Technology,Chengdu610059,China);Guo Ke Study of Geochemical Ore-Forming Anomaly Identification Based on the Theory of Blind Source Separation(Geosci- 相似文献
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正20141334 Chen Kun(Institute of Geophysics,China Earthquake Administration,Beijing100081,China);Yu Yanxiang Shakemap of Peak Ground Acceleration with Bias Correction for the Lushan,Sichuan Earthquake on April20,2013(Seismology and Geology,ISSN0253-4967,CN11-2192/P,35(3),2013,p.627-633,2 illus.,1 table,9 refs.)Key words:great earthquakes,Sichuan Province 相似文献
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正20141624 Cai Xiongfei(Key Laboratory of Geobiology and Environmental Geology,Ministry of Education,China University of Geosciences,Wuhan 430074,China);Yang Jie A Restudy of the Upper Sinian Zhengmuguan and Tuerkeng Formations in the Helan Mountains(Journal of Stratigraphy,ISSN0253-4959CN32-1187/P,37(3),2013,p.377-386,5 illus.,2 tables,10 refs.) 相似文献
18.
正20142263Lü Shaojun(Geological Survey of Jiangxi Province,Nanchang 330030,China)Early-Middle Permian Biostratigraphical Characteristics in Qiangduo Area,Tibet(Resources SurveyEnvironment,ISSN1671-4814,CN32-1640/N,34(4),2013,p.221-227,2illus.,2tables,22refs.)Key words:biostratigraphy,Lower Permian,Middle Permian,Tibet 相似文献
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正20142560Hu Hongxia(Regional Geological and Mineral Resources Survey of Jilin Province,Changchun 130022,China);Dai Lixia Application of GIS Map Projection Transformation in Geological Work(Jilin Geology,ISSN1001-2427,CN22-1099/P,32(4),2013,p.160-163,4illus.,2refs.) 相似文献
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正20140692 Duo Tianhui(No.402 Geological Team,Exploration of Geology and Mineral Resources of Sichuan Authority,Chengdu611730,China);Wang Yongli Computer Simulation of Neptunium Existing Forms in the Groundwater(Computing Techniques for Geophysical and Geochemical Exploration,ISSN1001-1749,CN51-1242/P,35(3), 相似文献