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1.
发射光谱法测定勘查地球化学样品中银硼锡钼铅 总被引：21，自引：13，他引：21
以K2S2O7、NaF、Al2O3和炭粉为缓冲剂，Ge为内标，电弧发射光谱法测定勘查地球化学样品中Ag、B、Sn、Mo、Pb。方法检出限为Ag0．013μg／g、B0．83μg/g、Sn0．23μg／g、Mo0．073μg/g、Pb0．37μg／g。方法精密度（RSD，n=12）为Ag4．2％～11．3％、B3．2％～6．5％、Sn2．6％～7．1％、Mo2．9％～6．3％、Pb1．57％～5．18％。测定了国家一级地球化学标准物质，结果与标准值相符。 相似文献
2.
在硫酸溶液中，以Ag2SO4为摧化剂，加入过量K2Cr2O7标准溶液氧化土壤中的有机碳，然后用FeSO4标准溶液滴定剩余的K2Cr2O7标准溶液，返滴定法测定有机碳含量。实验测得S为0．0186(n＝15)，RSD％为3．60(X^-＝0．518％)；到定土境和水系沉积物等国家标准物质中有机碳的含量，相对误差小于11．5％。 相似文献
3.
基于0．02mol／L HCl介质中，痕量钴(Ⅱ)对重铬酸钾氧化偶氮胂Ⅲ褪色反应的催化作用，建立了测定痕量钴(Ⅱ)的动力学光度法。钴(Ⅱ)质量在0～4．0μg/L范围内服从比尔定律，方法检出限为0．076μg/L，在25mL溶液中，测定0．1μg钴(Ⅱ)的相对标准偏差为3．8％(n=11)。讨论了酸度、反应物浓度、温度、反应时间、干扰离子等因素的影响。研究了反应的最佳条件，并测定了一些动力学参数。催化反应的表观活化能为40．73kJ／mol。此法可用于井水、蜂蜜和维生素B12中钴(Ⅱ)的测定，相对标准偏差为1．8％-5．7％，标准加入回收率为99．6％～104．2％。 相似文献
4.
采用马弗炉将样品与NaOH混合进行熔融煅烧，热去离子水提取、离心、稀释后过OnGuard Ⅱ H柱和过滤膜进行前处理，抑制型电导离子色谱法检测，测定了Ta2O5和Nb2O5的氟离子、氯离子和硫酸根离子。该方法对三种被测阴离子的检测限（s／N=3）在0．15～0．70μg／g（以固体样品实际浓度计）或0．136～0．623μg／L（以溶液浓度计），标准曲线线性范围均在两个数量级以上，方法的精密度（RSD，n=7）小于5．46％，回收率为88％～106％，具有灵敏度高、选择性好、重现性佳、对环境友好等特点，用于实际样品的检测，结果令人满意。 相似文献
5.
原子荧光光谱法直接测定铜矿中的硒 总被引：6，自引：5，他引：6
采用硫脲抑制铜的干扰，不经分离富集原子荧光光谱法直接测定铜矿中的Se。方法的检出限为0．02μg/g。Se浓度在0～80μg／L与荧光强度呈线性关系。用铜矿石国家一级标准物质GBW 07233(ωSe为5．1μg／g)和GBW 07234(ωSe为0.89μg／g)进行精密度试验，RSD(n=12)为3.44％、8.06％。加标准回收试验结果，Se的回收率为93．2％～104、6％。经铜矿石国家标准物质验证，测定结果与标准值相符，方法适用于铜矿中0～8．0μg／g Se的测定。 相似文献
6.
活性炭对无机汞和苯基汞的吸附行为探讨 总被引：3，自引：0，他引：3
试验了活性炭对无机汞和苯基汞的吸附和解吸行为。结果表明，在活性炭用量为0．2g，ψ=0．5％的王水介质中搅拌1．5h，无机汞和苯基汞的吸附率均达96％以上，无机汞和苯基汞的吸附容量分别为82．5μg/g和66．0μg/g。吸附后的无机汞和苯基汞分别用含有60mg EDTA的2．8mol/L HNO3溶液和5．6mol/L HNO3-1．0mol/L H2SO4溶液定量洗脱，用冷原子吸收光谱法测定，实现了无机汞和苯基汞的定量分离。对2μg/L的无机汞和苯基汞进行测定，相对标准偏差(n=11)分别为5．4％和6．2％。在实际水样中加标回收和测定，无机汞和苯基汞的回收率分别为97．8％～108％、94．0％～106％。 相似文献
7.
用金属铝与液态溴发生反应生成的AlBr3溶于甲醇、而Al2O3在无水条件下不与液态溴发生反应的不同化学行为特性，实现了Al与Al2O3的分离，采用铝试剂光度法测定铝锭中的微量AAl2O3。结果表明，在pH4．4的NaAc—HCI缓冲溶液中，铝与铝试剂形成的配合物在530nm处有最大吸收。Al2O3含量在0～3．0mg／L遵循比尔定律。方法检出限为0．005mg／L。建立的方法用于实际铝锭样品中Al2O3的测定，精密度（RSD，n=5）为3．50％～14．3％，加标回收率为98．9％～99、7％。 相似文献
8.
铜泡石的矿物学特征及其地质意义 总被引：2，自引：0，他引：2
在云南个旧矿区的硫化物型铜锡矿床氧化带矿石中发现有铜泡石。该矿物呈绿色片状集合体产出，略具柔性，实测密度3．20，主要化学成分CuO 43．51％，CaO 6．96％，As2O5 30．16％，SO3 0．73％。粉晶X射线衍射线(d／nm)主要有：2．787(10)，1．401(7)，0．552(1)，0．480(7)，0．430(5)，0．380(1)，0．335(2)，0．295(5)，0．268(7)，0．242(1)，0．185(1)，与JCPDS11-348卡片的铜泡石粉晶数据基本一致。共、伴生的矿物见有孔雀石、硅孔雀石及辉铜矿、蓝铜矿、水胆矾等，反映了硫化物铜锡矿床的氧化带特征，可作为寻找该类矿床的找矿标志之一。 相似文献
9.
悬浮液进样-氢化物发生原子荧光光谱法测定土壤中痕量砷锑硒 总被引：5，自引：2，他引：5
在原子荧光光谱法传统样品前处理的基础上，提出了悬浮液进样技术。用琼脂作为悬浮剂，水溶液作为校正曲线，对土壤标准样品和实际样品进行测定，结果令人满意，并且省去了冗长的样品化学前处理过程。检出限分别为砷0．33μg／L、锑0．13μg／L、硒0．06μg／L；相对标准偏差分别为：砷3．92％～6．32％、锑1．76％～3．11％、硒3．08％～5．54％；回收率分别为砷98．7％～105．7％、锑99．5％-103．3％和硒94．6％-107．2％。国家一级标准物质的测定结果与标准值相符，实际样品的测定值与传统消化法相比较，结果基本一致。 相似文献
10.
报道了以NH4H2PO4为基体改进剂，采用悬浮体制样石墨炉原子吸收光谱法直接测定琥珀中微量铅的方法。试验了影响测定的主要因素。在优化实验条件下。方法的检出限为0．038μg／g，Pb的质量浓度为0～80μg／L时，工作曲线线性关系良好。对于ω(Pb)=5．71μg／g样品的测定，相对标准偏差(RSD，n=5)为6．83％。 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
15.
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
16.
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
17.
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
19.
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
20.
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