共查询到20条相似文献,搜索用时 703 毫秒
1.
2.
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
3.
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
4.
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
5.
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
6.
7.
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
8.
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
9.
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
10.
在0.13mo1/LN_2SO_4及8%丙酮介质中,p(Ⅴ)-Sb(Ⅲ)-W(Ⅵ)三元杂多酸在示波极谱仪上产生一良好的吸附还原波。峰电位为一0.52V(υs.SCE),峰电流(导数波高)与P浓度在8.0×10 ̄(-7)~2.0×10 ̄(-5)mol/L范围内呈线性关系,检测下限为2.0×10 ̄(-7)mol/L。对极谱波的性质进行了探讨,用该法测定了钢标样中的微量P,结果与推荐值相符。 相似文献
11.
Muriel Rocher Stéphane Baize Stéphane Jaillet Edward Marc Cushing Yannick Lozach Francis Lemeille 《Comptes Rendus Geoscience》2003,335(8):701-708
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
12.
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
13.
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
14.
15.
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
16.
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
17.
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
18.
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
19.
正20141768 An Shaopeng(Institute of Rock and Soil Mechannics,Chinese Academy of Sciences,Wuhan 430071,China);Wei Lide Experimental Study on Mechanical Behavior of Xigeda Formation Siltstone and Structure Interface(Journal of Engineering Geology,ISSN1004-9665,CN11-3249/P,21(5),2013,p.702-708,9illus.,1 table,16 refs.) 相似文献
20.
正20140985Chen Liang(Post-Doctoral Research Station of Mining Engineering,School of Nuclear Resources and Nuclear Fuel Engineering,University of South China,Heng-yang 421001,China);Huang Wei Composition of Major and Correlated Elements with Organic Matters and Paleoclimatic Implication for Lower Paleogene Sediments in Sanshui Basin 相似文献