共查询到20条相似文献，搜索用时 78 毫秒
1.
1994 COMPILATION OF ANALYTICAL DATA FOR MINOR AND TRACE ELEMENTS IN SEVENTEEN GSJ GEOCHEMICAL REFERENCE SAMPLES, "IGNEOUS ROCK SERIES" 总被引：1，自引：3，他引：1
Noboru IMAI Shigeru TERASHIMA Shiro ITOH Atsushi ANDO 《Geostandards and Geoanalytical Research》1995,19(2):135-213
Analytical data for minor and trace elements published or communicated to us, on seventeen GSJ (Geological Survey of Japan) reference samples, "Igneous rock series" received up to April 1994 are compiled. The data were evaluated statistically in consideration of analytical methods. Based on the selected available data, 1994 recommended and proposed values for 65 minor and trace elements are presented. 相似文献
2.
Concentration data on 80 individual constituents in Canadian Certified Reference Materials Project rock reference materials SY-2, SY-3, and MRG-I have been collected from 382 journal articles and technical reports. These data are summarized as consensus (mean) values with uncertainties expressed as one standard deviation. Mean values are also calculated as a function of analytical procedure and all raw data are given in the tables. Recommended values are proposed based upon data criteria used by NIST (National Institute of Standards and Technology, formerly the National Bureau of Standards or NBS). 相似文献
3.
Noboru IMAI Shigeru TERASHIMA Shiro ITOH Atsushi ANDO 《Geostandards and Geoanalytical Research》1996,20(2):165-216
Analytical data compiled on nine Geological Survey of Japan (GSJ) reference samples, "Sedimentary rock series" received by February 1996 are reported. After excluding outliers and examining critically the analytical procedures employed, the data were evaluated statistically. Recommended or preferable values for fifteen major and sixty minor and trace elements are proposed. 相似文献
4.
Harry Dembicki 《Geochimica et cosmochimica acta》1984,48(12):2641-2649
Organic matter in eight rock samples has been analyzed by nineteen laboratories and the results show that source rock data from any one laboratory cannot be directly compared to data from any other laboratory. A high degree of variability exists among the data reported by the nineteen participating laboratories, most of which can be explained by differences in the sample preparation steps and analytical procedures used in these laboratories. Differences also exist in the definition of basic units of measurement being reported. In order to make the data more comparable, standard rock samples and analytical methods should be developed and used by all laboratories. Until then, extreme caution must be used when comparing source rock data from different laboratories. 相似文献
5.
6.
氢化物-原子荧光光谱法测定地质样中的痕量硒--不同溶样方式的比较 总被引：7，自引：1，他引：6
以确定测试基性岩中痕量硒的最佳溶样方式为目的,分别采用加压（PTFE）强酸消解和常压强酸消解两种方法消解标准参考物质和地质样品,直接用氢化物原子荧光光谱法（HG-AFS）测定。实验选用标准参考物质GWB07105、GWB07107对方法准确度和精确度进行验证,所测得总硒量与推荐值相符,标准偏差（SD）小于7．3ng／g,相对标准偏差（RSD）小于8．9％。实验测定了5个硒含量不同的岩石样品,不同方法所测数据基本一致。样品的均匀性在一定程度上影响痕量硒的测定结果。综合评价比较二者的测定结果,可知加压（PTFE）强酸消解（硝酸＋硫酸＋氢氟酸）为最佳溶样方式。 相似文献
7.
L.L. PETROV Yu.N. KORNAKOV L.A. PERSIKOVA V.V. MALYKH A.Z. PROKOP'EVA 《Geostandards and Geoanalytical Research》1996,20(1):95-132
The preparation and study of the two rock reference samples, Quartz Diorite SKD-1 and Sviatonossite SSv-1, are described, along with mineralogical and petrographic features. After its homogeneity studies, the two samples were analysed by seventy-five former USSR laboratories in the framework of an interlaboratory analytical program. The two samples have been certified respectively for 41 and 39 major, minor and trace elements; additionally, values are proposed for about 20 trace elements. The compiled data on the two samples are presented as an Appendix. Both the samples, processed in about 280 kg, form now part of the set of eight magmatic rock reference samples prepared by the Institute of Geochemistry in Irkutsk. 相似文献
8.
Results are presented for 26 to 30 trace elements determined in four rock reference materials of geochemical interest: USGS Basalt BHVO-1, Rhyolite Obsidian NIST 278, Basalt NIST688, and Phosphate Rock NIST694. Determinations were made by inductively coupled plasma mass spectrometry (ICP-MS). Good agreement was obtained among solution standard comparison and standard addition analytical techniques, and among samples prepared with different dissolution methods. Generally good agreement was obtained between determined trace element values and values reported in the literature. 相似文献
9.
Stefano Signorelli 《Environmental Geology》1997,32(4):239-244
Total arsenic contents were determined in volcanic gases by analysis of fumarolic condensates collected in the period 1984–1992
from different volcanoes around the world. Arsenic concentrations range from <0.006 to 30 μg/g. The highest values (1.2–30 μg/g)
were found at Vulcano, Aeolian Islands (southern Italy). The analytical data show that volcanic gases have a large variability
of arsenic contents possibly related to both the different physicochemical features of magma source and rock properties within
the volcanic system.
Received: 2 October 1996 · Accepted: 29 January 1997 相似文献
10.
11.
This paper presents the engineering geological properties and support design of a planned diversion tunnel at the Boztepe dam site that contains units of basalt and tuffites. Empirical, theoretical and numerical approaches were used and compared in this study focusing on tunnel design safety. Rock masses at the site were characterized using three empirical methods, namely rock mass rating (RMR), rock mass quality (Q) and geological strength index (GSI). The RMR, Q and GSI ratings were determined by using field data and the mechanical properties of intact rock samples were evaluated in the laboratory. Support requirements were proposed accordingly in terms of different rock mass classification systems. The convergence–confinement method was used as the theoretical approach. Support systems were also analyzed using a commercial software based on the finite element method (FEM). The parameters calculated by empirical methods were used as input parameters for the FEM analysis. The results from the two methods were compared with each other. This comparison suggests that a more reliable and safe design could be achieved by using a combination of empirical, analytical and numerical approaches. 相似文献
12.
中国火成岩化学元素的丰度与分布 总被引：19，自引：3，他引：19
在中国各构造单元构选采了１０３６４件火成岩样品合成１１３１个分析样，采用仪器中子活化法，Ｘ射线荧光光谱法，原子吸收法，原子荧光光谱法，催化波极谱法和分光光度法等１５种可靠分析方法进行测试，对一些难测痕量元素采用了最新的分析研究成果，以同类国家一级标准物质监控分析质量。 相似文献
13.
Peter DULSKI 《Geostandards and Geoanalytical Research》1992,16(2):325-332
Analytical data on samples FeR-1, FeR-2, FeR-3 and FeR-4 obtained by instrumental neutron activation analysis and by inductively coupled plasma mass spectrometry are presented. The applied methods are described, and the analytical problems associated with their use are discussed. The accuracy of the two methods is demonstrated by comparing the results with the recommended values of the iron formation reference sample, IF-G. For the four FeR samples a set of values summarizing all data obtained by the two analytical methods is also given. 相似文献
14.
Omid Saeidi Seyed Rahman Torabi Mohammad Ataei 《Rock Mechanics and Rock Engineering》2014,47(2):717-732
Rock mass classification systems are one of the most common ways of determining rock mass excavatability and related equipment assessment. However, the strength and weak points of such rating-based classifications have always been questionable. Such classification systems assign quantifiable values to predefined classified geotechnical parameters of rock mass. This causes particular ambiguities, leading to the misuse of such classifications in practical applications. Recently, intelligence system approaches such as artificial neural networks (ANNs) and neuro-fuzzy methods, along with multiple regression models, have been used successfully to overcome such uncertainties. The purpose of the present study is the construction of several models by using an adaptive neuro-fuzzy inference system (ANFIS) method with two data clustering approaches, including fuzzy c-means (FCM) clustering and subtractive clustering, an ANN and non-linear multiple regression to estimate the basic rock mass diggability index. A set of data from several case studies was used to obtain the real rock mass diggability index and compared to the predicted values by the constructed models. In conclusion, it was observed that ANFIS based on the FCM model shows higher accuracy and correlation with actual data compared to that of the ANN and multiple regression. As a result, one can use the assimilation of ANNs with fuzzy clustering-based models to construct such rigorous predictor tools. 相似文献
15.
Gold, Palladium and Tellurium in South African, Chinese and Japanese Geological Reference Samples 总被引：1，自引：0，他引：1
Reliable rock reference materials for Au, Pd and Te are scarce. We report here our analytical data on these three elements in 46 NIM, IGGE and GSJ reference samples in order to accumulate analytical data on these samples. 相似文献
16.
17.
18.
以新疆西准噶尔包古图Ⅴ号岩体为例,系统论述了包古图Ⅴ号含矿岩体的围岩蚀变分带和蚀变期次。结合ETM+数据的特征,选择多种遥感图像预处理方法组合,建立了基于典型蚀变矿物的特征光谱拟合技术的多光谱遥感蚀变信息提取模型,即遥感数据的归一化处理(Calibration )+掩膜(Mask)+混合像元分解(Endmember Unmixing)+波谱拟合(Spectral Feature Fitting)+ SAM+分类(分割)的CES模型。据此模型对岩体进行信息提取,并与化探资料叠加验证了该方法的可行性,取得了较满意的效果。 相似文献
19.
S. ABBEY 《Geostandards and Geoanalytical Research》1978,2(2):141-146
Based on the most recent compilation of analytical data, a new set of “usable values” is calculated for six of the best known silicate rock reference samples produced by the U.S. Geological Survey. The latest version of the “best laboratories” method is described and results are compared with other recently published values. 相似文献