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1.
阳极溶出伏安法同时测定痕量锡和镉   总被引:4,自引:1,他引:4  
在HCl-NH_4Cl底液中,电解时间60s、电镀时间5s、除氧30s的条件下,Sn和Cd有稳定的溶出峰。Sn和Cd的检出限分别为6.5μg/L和3.0μg/L,测定范围分别为10~200μg/L和5~180μg/L。对含Sn和Cd为20μg/L的试液测定10份,RSD分别为5.61%和4.83%。方法用于实际样品测定,结果与文献方法相符。  相似文献   

2.
催化光度法测定痕量锇   总被引:3,自引:0,他引:3  
唐宁莉  唐建洪 《岩矿测试》1996,15(4):283-285
在05mol/L的H2SO4介质中,As(Ⅲ)存在下,Os(Ⅷ)催化KClO3氧化邻苯二酚紫褪色反应。反应受温度、反应时间影响,冷却及加入抗坏血酸可终止反应。据此,建立了一个测定痕量Os(Ⅷ)的新方法。方法的灵敏度为257×10-10g/LOs(Ⅷ),测定范围为0~0091μg/L,用地质管理样中锇的测定验证,结果与原结果相符  相似文献   

3.
周丽沂  张勤 《岩矿测试》1995,14(1):45-48
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   

4.
等离子体发射光谱法同时测定大气气溶胶中多种金属元素   总被引:11,自引:0,他引:11  
林学辉  刘昌岭 《岩矿测试》1998,17(2):143-146
建立了采用等离子体发射光谱测定大气气溶胶中金属元素的方法。气溶胶样品经密封混合酸消解处理后,直接进行Al、Ca、Mg、K、Na、Mn、Fe、Sr、V和Zn10种元素的测定,方法检出限在02~11μg/L,对于0x~xxmg/L的样品测定6次的精密度好,RSD<12%,样品加标回收率为986%~1050%。方法经国家一级标样验证可行,已用于大批大气气溶胶样品的测定。  相似文献   

5.
氢化物—原子荧光法测定岩石中痕量硒的干扰及消除   总被引:12,自引:10,他引:12  
张锦茂  范凡 《岩矿测试》1993,12(4):264-267
用HF-HClO4-HNO3混合酸分解样品,采用Fe^3+作释放剂,研究了不同量的Fe^3+与HCl酸度对Se荧光强度的影响和干扰离子消除的效果,以及Fe^3+存在Te存在下对Se测定的影响。方法的检出限为0.01μg/g.样品中Se量为0.1μg/g的相对标准偏差(n=11)是5.4%。用于岩石标样中痕量Se的测定,结果较好。  相似文献   

6.
采用流动注射夹层带进样方式研究了酚红法测定溴的化学条件和流路参数,所建立的方法具有灵敏度高、精密度好、试剂消耗量少和分析速度快的特点。在所选实验条件下,Br-的质量浓度为02~100mg/L时有良好的线性关系,检出限和相对标准偏差(20mg/LBr-,n=11)分别为011mg/L和088%,测定速度为60~90/h。对化学试剂KCl和NaCl中的杂质溴进行了测定,加标回收率为95%~105%。  相似文献   

7.
王万美  郑民奇 《岩矿测试》1994,13(2):125-127
样品经HNO3-HF-HCLO4分解发,在5.4mol/L的HCl介质中,以抗坏血酸为还原剂用甲基异丁基甲酮同时萃取样品中的Se,Te.c Pd和Ni作混合基体改进剂,使用自制的涂锆石墨平台直接测定有机相中的Se,Te。方法的检出限分别为0.21×10^-9gSe,0.13×10^-9gTe;测定0.06μgSE、0.03μgTe的RSD(n=11)分别为7.0%和8.9%。  相似文献   

8.
陈同森  赵欣 《岩矿测试》1994,13(4):254-258
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   

9.
李冰 《岩矿测试》1994,13(1):20-24
研究了用感耦等离子体发射光谱(ICP-AES)测定纯氧化镧中Ce,Pr,Nd,Sm,Y,Fe,Al,Ca,Mg和Si10个杂质元素的方法。考察了基体镧的光谱干扰,共存元素间光谱干扰及校正方法,方法检出限为0.0005-0.039μg/ml;标准加入量1μg/ml时,回收率为95%-106%;10μg/ml的标准溶液,测定10次,RSD为0.24%-1.01%。方法简单,快速,不震分离富集,适用于氧  相似文献   

10.
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   

11.
Pant-y-ffynnon Quarry in South Wales yielded a rich cache of fossils in the early 1950s, including articulated specimens of new species (the small sauropodomorph dinosaur Pantydraco caducus and the crocodylomorph Terrestrisuchus gracilis), but no substantial study of the wider fauna of the Pant-y-ffynnon fissure systems has been published. Here, our overview of existing specimens, a few described but mostly undescribed, as well as freshly processed material, provides a comprehensive picture of the Pant-y-ffynnon palaeo-island of the Late Triassic. This was an island with a relatively impoverished fauna dominated by small clevosaurs (rhynchocephalians), including a new species, Clevosaurus cambrica, described here from a partially articulated specimen and isolated bones. The new species has a dental morphology that is intermediate between the Late Triassic Clevosaurus hudsoni, from Cromhall Quarry to the east, and the younger C. convallis from Pant Quarry to the west, suggesting adaptive radiation of clevosaurs in the palaeo-archipelago. The larger reptiles on the palaeo-island do not exceed 1.5?m in length, including a small carnivorous crocodylomorph, Terrestrisuchus, and a possible example of insular dwarfism in the basal dinosaur Pantydraco.  相似文献   

12.
Robert L. Linnen   《Lithos》2005,80(1-4):267-280
The solubilities of columbite, tantalite, wolframite, rutile, zircon and hafnon were determined as a function of the water contents in peralkaline and subaluminous granite melts. All experiments were conducted at 1035 °C and 2 kbar and the water contents of the melts ranged from nominally dry to approximately 6 wt.% H2O. Accessory phase solubilities are not affected by the water content of the peralkaline melt. By contrast, solubilities are affected by the water content of the subaluminous melt, where the solubilities of all the accessory phases examined increase with the water content of the melt, up to 2 wt.% H2O. At higher water contents, solubilities are nearly constant. It can be concluded that water is not an important control of accessory phase solubility, although the water content will affect diffusivities of components in the melt, thus whether or not accessory phases will be present as restite material. The solubility behaviour in the subaluminous and peralkaline melts supports previous spectroscopic studies, which have observed differences in the coordination of high field strength elements in dry vs. wet subaluminous granitic glasses, but not for peralkaline granitic glasses. Lastly, the fact that wolframite solubility increases with increasing water content in the subaluminous melt suggests that tungsten dissolved as a hexavalent species.  相似文献   

13.
Calcite samples were extracted both from the rock matrix and the superficial coating of a karstified fault plane of an underground quarry, located in the eastern border of the Paris basin. The karstification is dated as Quaternary. Analysis of mechanical calcite twinning reveals that only the calcite matrix has also undergone a compression trending WNW that can be attributed to the Mio-Pliocene alpine collision. Both coating and matrix have undergone a strike-slip regime with σ1 roughly trending north–south, that could correspond to the regional present-day state of stress, a strike-slip compression rather trending NNW, modified by local phenomena. To cite this article: M. Rocher et al., C. R. Geoscience 335 (2003).  相似文献   

14.
HYDROGEOLOGY     
正20141756 Chen Ruige(Mathematical College,China University of Geosciences,Beijing100083,China);Zhou Xun Numerical Simulation of Groundwater Level Fluctuation in a Coastal Confined Aquifer with Sloping Initial Groundwater Level Induced by the Tide(Geological Bulletin of China,ISSN1671-2552,CN11-4648/P,32(7),2013,p.1099-1104,6 illus.,16 refs.) Key words:confined water,groundwater level  相似文献   

15.
正20141408 Cai Jia(Institute of Geology,Chinese Academy of Geological Sciences,Beijing100037,China);Liu Fulai Petrogenesis and Metamorphic P-T Conditions of Garnet-Spinel-Biotitebearing Paragneiss in Danangou Area,Daqingshan-Wulashan Metamorphic Complex Belt(Acta Petrologica Sinica,ISSN1000-0569,CN11-1922/P,29(7),  相似文献   

16.
17.
正20142386An Guoying(China Aero Geophysical Survey and Remote Sensing Center for Land and Resources,Beijing 100083,China)Application of Satellite Remote Sensing in Regional Hydrogeological Investigation:Taking Cenozoic Strata in Wenquan Sheet(1∶250 000)of Karakoram Range as an Example(Geosci-  相似文献   

18.
正20141016An Chengbang(Key Laboratory of Western China’s Environmental Systems,Ministry of Education,Lanzhou University,Lanzhou 730000,China);Zhao Yongtao Lake Records during the Last Glacial Maximum from Xinjiang,NW China and Their Climatic Impli-  相似文献   

19.
正20141538 Cao Qing(School of Earth Sciences and Engineering,Xi’an Petroleum University,Xi’an 710065,China);Zhao Jingzhou Characteristics and Significance of Fluid Inclusions from Majiagou Formation,Yichuan Huangling Area,Ordos Basin(Advances in Earth Science,ISSN1001-8166,CN62-1091/P,28(7),2013,p.819-828,7 illus.,3 tables,43 refs.)  相似文献   

20.
GEOCHEMISTRY     
正20142002 Wei Hualing(Institute of Geophysical and Geochemical Exploration,Chinese Academy of Geological Sciences,Langfang065000,China);Zhou Guohua Element Content and Mineral Compositions in Different Sizes of Soil in Tongling Area,Anhui Province(Geological Bulletin of China,ISSN1671-2552,CN11-4648/P,32(11),2013,p.1861  相似文献   

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