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1.
Ernest S. GLADNEY Elizabeth A. JONES Eric J. NICKELL Iwan ROELANDTS 《Geostandards and Geoanalytical Research》1992,16(2):111-300
Concentration data on up to 90 individual constituents in USGS AGV-1, GSP-1, and G-2 have been collected from 1270 journal articles and technical reports. These data are summarized in 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
2.
Concentration data on 74 individual constituents in CCRMP (Canadian Certified Reference Materials Project) soils SO-1, SO-2, SO-3, and SO-4 have been collected from 83 journal articles and technical reports. These data are summarized in 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.
Concentration data on 73 individual constituents in United States Geological Survey (USGS) Geochemical Exploration Reference Materials GXR-1 to GXR-6 have been collected from 131 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
4.
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
5.
Ernest S. Gladney Elizabeth A. Jones Eric J. Nickell Iwan Roelandts 《Geostandards and Geoanalytical Research》1991,15(2):199-396
Concentration data on up to 91 individual constituents in USGS DTS-1, G-1, PCC-1, and W-1 have been collected from 1647 journal articles and technical reports. These data are summarized in 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 Standrds or NBS). 相似文献
6.
Total carbon and inorganic carbon were determined by coulometric titration for 18 National Bureau of Standards (NBS) Standard Reference Material (SRM) and 4 Canadian Certified Reference Project Standards (CCRMP). A wide range of carbon contents was represented in the samples, which included biological, geological, and environmental materials. The analytical data produced helps fill gaps in the available literature for total and inorganic carbon values. 相似文献
7.
N.W. BOWER C.M. LEWIS P.E. NEIFERT E.S. GLADNEY 《Geostandards and Geoanalytical Research》1992,16(1):27-40
Data are presented for twenty standard reference materials currently available from the USA's National Institute of Standards and Technology (NIST) that are of use in geochemical analyses. Some of these standards have not been previously presented in the geochemical literature and many elements'concentrations are reported here for the first time. Instrumental neutron activation analysis, X-ray fluorescence, colorimetry, and coulometry were employed to obtain results on ten major and thirty-eight trace element concentrations as well as H2O+ and H2O-. Error bars for the analyses as well as consensus values from the literature are presented and generally good agreement are obtained for the available values. 相似文献
8.
Ernest S. GLADNEY Sammy R. GARCIA Janet S. NEWLIN 《Geostandards and Geoanalytical Research》1986,10(1):77-80
An automated multidetector system for instrumental thermal neutron activation of geological and environmental materials was used for the measurement of up to 34 elements in six National Bureau of Standards Standard Reference Material coal samples. Good agreement was achieved with NBS certified and literature consensus values. 相似文献
9.
10.
The Canadian Certified Reference Materials Project announces recommended values for radium-226 activity in four reference materials previously certified for uranium. Thirteen laboratories participated in the interlaboratory program for DL-la, DH-la, BL-4a and BL-5. Four measurement techniques were applied. Procedural and instrument calibrations were performed with certified radium solutions from the National Bureau of Standards, thereby establishing traceability of the recommended values for radium-226 in DL-la, DH-la, BL-4a and BL-5. These reference ores are also shown to be close to, if not in, radioactive equilibrium. 相似文献
11.
A Compilation of New and Published Major and Trace Element Data for NIST SRM 610 and NIST SRM 612 Glass Reference Materials 总被引：37，自引：0，他引：37
Nicholas J.G. Pearce William T. Perkins John A. Westgate Michael P. Gorton Simon E. Jackson Clive R. Neal Simon P. Chenery 《Geostandards and Geoanalytical Research》1997,21(1):115-144
Microanalytical trace element techniques (such as ion probe or laser ablation ICP-MS) are hampered by a lack of well characterized, homogeneous standards. Two silicate glass reference materials produced by National Institute of Standards and Technology (NIST), NIST SRM 610 and NIST SRM 612, have been shown to be homogeneous and are spiked with up to sixty one trace elements at nominal concentrations of 500 μg g-1 and 50 μg g-1 respectively. These samples (supplied as 3 mm wafers) are equivalent to NIST SRM 611 and NIST SRM 613 respectively (which are supplied as 1 mm wafers) and are becoming more widely used as potential microanalytical reference materials. NIST however, only certifies up to eight elements in these glasses. Here we have compiled concentration data from approximately sixty published works for both glasses, and have produced new analyses from our laboratories. Compilations are presented for the matrix composition of these glasses and for fifty eight trace elements. The trace element data includes all available new and published data, and summaries present the overall average and standard deviation, the range, median, geometric mean and a preferred average (which excludes all data outside ± one standard deviation of the overall average). For the elements which have been certified, there is a good agreement between the compiled averages and the NIST data. This compilation is designed to provide useful new working values for these reference materials. 相似文献
12.
We report on the major and trace element composition and homogeneity of NIST (National Institute of Standards and Technology) glass standard reference materials 611, 612, 614, and 1834 for use as microanalytical trace element standards in laser ablation-inductively coupled plasma-mass spectrometry. The four analyzed NIST glasses were not designed as microanalytical standards, but their availability and careful preparation made them obvious candidates. Our data indicate that NIST 1834 is inhomogeneous on a scale of 100 mg with respect to several trace elements. Within analytical uncertainty, NIST 611, 612, and 614 are apparently homogeneous. 相似文献
13.
Standards for the exchange of machine-readable data are discussed at five levels covering (1) physical characteristics of the medium used in the exchange, (2) overall structure of the data file, (3) format of individual records, (4) types of information contained in a record, and (5) authority files for information definition. The standards are used by the National Geothermal information Resource for compilations of geothermal energy data.This paper was presented at the International Geological Correlation Program (IGCP) Project 98 entitled Standards for Computer Applications in Resource Studies held at Loen, Norway, September 27–October 1, 1976. 相似文献
14.
DETERMINATION OF THIRTY-TWO MAJOR AND TRACE ELEMENTS IN THREE NIST SOIL SRMS USING ICP-AES AND WDXRF
S.A. WILSON P.H. BRIGGS J.S. MEE D.F. SIEMS 《Geostandards and Geoanalytical Research》1994,18(1):85-89
The National Institute for Standards and Technology (NIST) has recently released three soil standard reference materials that are uncontaminated (SRM 2709), moderately contaminated (SRM 2711), and highly contaminated (SRM 2710) with metals. The SRMs were analyzed at the U.S. Geological Survey (USGS) for thirty two major, minor and trace elements using a combination of wavelength dispersive X-ray fluorescence spectroscopy (WDXRF) and inductively coupled plasma atomic emission spectroscopy (ICP-AES). Good agreement is observed between NIST certified values and USGS results. The wide concentration ranges for most transition metals should make these SRMs useful in assessing the accuracy of methods used in geochemical exploration and environmental studies. 相似文献
15.
F.J. Flanagan 《Geochimica et cosmochimica acta》1974,38(12):1731-1744
A revised list of reference samples of interest to geoscientists has been extended to include samples for the agronomist, the archaeologist and the environmentalist. In addition to the source from which standard samples may be obtained, references or pertinent notes for some samples are included.The number of rock reference samples is now almost adequate, and the variety of ore samples will soon be sufficient. There are very few samples for microprobe work. Oil shales will become more important because of the outlook for world petroleum resources. The dryland equivalent of a submarine basalt might be useful in studies of sea-floor spreading and of the geochemistry of basalts.The Na- and K-feldspars of BCS (British Chemical Standards—Bureau of Analysed Samples), NBS (National Bureau of Standards), and ANRT (Association Kationale de la Recherche Technique) could serve as trace-element standards if such data were available. Similarly, the present NBS flint and plastic clays, as well as their predecessors, might be useful for archaeological pottery studies. The International Decade for Ocean Exploration may stimulate the preparation of ocean-water standards for trace elements or pollutants and a standard for manganese nodules. 相似文献
16.
Two new geologic reference materials, issued by the National Bureau of Standards as standard reference materials, have been analyzed by a precise, accurate, and rapid method of analysis for their element content. The described procedure uses a multi-acid, low temperature digestion in a closed teflon vessel, followed by the simultaneous determination of 50 elements by inductively coupled argon plasma-optical emission spectrometry. A preconcentration procedure was applied to a separate digestion for the accurate and precise determination of the rare earth elements. Average concentrations of 39 elements for SRM 278 obsidian and 36 elements for SRM 688 basalt are reported. The results for most elements are in good agreement with the certified values and those reported in the literature. Data for as many as 12 elements are reported for these samples for the first time. 相似文献
17.
山东省威海市区域地质背景下土壤Cd的地球化学特征 总被引：3，自引：0，他引：3
为获取威海市区域地质背景下土壤重金属元素Cd的地球化学特征,以区域表层和深层土壤Cd为研究对象进行讨论。统计分析得出Cd区域土壤背景值为0.090×10-6,基准值为0.056×10-6。区域Cd的土壤环境质量较好,全区仅3.42%的表层土壤、1.17%的深层土壤超出国家土壤质量一级标准限值,其中仅1.67%的表层土壤出现污染,超出国家土壤二级标准。研究区土壤Cd的物源主要表现为自然源和人为源两大类。自然源主导区占54.68%,自然属性特征明显,表层和深层土壤Cd的相关性较好,且Cd与其他重金属元素间具有较好的地球化学组合特征;表层土壤Cd的分布主要受母质影响,在丘陵区土壤Cd含量受中生代中酸性侵入岩的分布影响较大,而平原区受第四系沉积物影响较大,其中陆源为主的平原区土壤Cd相对含量较高,与海水有关的平原区Cd含量普遍偏低。人为源主导区占45.32%,自然属性较差,受人为源影响较大,与工矿点等人为活动密集区分布较吻合。 相似文献
18.
The calcium isotopic composition of NIST SRM 915b and 1486 provided by the National Institute of Standards and Technology was analysed. The δ44/40Ca values of the two reference materials relative to NIST SRM 915a were: NIST SRM 915b =+0.72 ± 0.04‰ and NIST SRM 1486 =?1.01 ± 0.02‰. NIST SRM 1486 did not require any chemical separation prior to measurement. 相似文献
19.
Jean S. KANE 《Geostandards and Geoanalytical Research》1991,15(1):13-21
Two principal approaches are being used currently to develop reference samples used in geochemistry. The first is typified by work at The National Institute of Standards and Technology (NIST) to develop standard reference materials (SRMs) whose elemental concentrations are certified. All data is collected under stringent quality control (QC). Agreement between average results for replicated analyses (6≤n<20) obtained by two or more analysts using either a single, definitive method or independent methods of analysis is required for certification; a large number of laboratory/method average results is not. The United States Geological Survey (USGS), International Working Group (IWG), and others base recommended concentrations on larger sets of compiled data, which may or may not have been collected under similar conditions of QC. The derived recommended concentrations are updated periodically, on the assumption that recommended concentration quality improves as the size of the data base increases. That assumption is examined in this paper, and the general lack of statistically significant difference between original and updated concentration is demonstrated. 相似文献
20.
密闭高温高压溶样ICP-MS测定56种国家地质标准物质中的36种痕量元素——对部分元素参考值修正和定值的探讨 总被引：4，自引：3，他引：1
标准物质参考值的准确性在测试仪器校准、分析数据质量监控以及方法评价等方面具有非常重要的作用.为了检验国家地质标准物质参考值的准确性,本文应用高温高压密闭溶样-电感耦合等离子体质谱法分析了国家地质标准物质的18种岩石(GBW 07103 ～ GBW 07125)、19种沉积物(GBW 07301 ～ GBW 07318)和19种土壤(GBW 07401 ～ GBW 07430)中36种痕量与稀土元素.结果表明,除个别标准样品中的几个元素(Ni、Cr、Pb、Co、Cu、Sc、Yb、Lu)外,其余国家标准物质中36种元素测定结果的相对标准偏差均小于10％;绝大部分元素测定值的相对误差小于10％,测定值与参考值能较好地吻合.将误差较大元素的测定值与其他实验室的测定值以及文献报道值进行了比较,指出已有的参考值需要修正;针对部分沉积物和土壤中的元素未提供参考值,如GBW 07306的Ni、GBW 07313的Be、Hf、Ta,GBW 07314的Li、Be,GBW 07409、GBW 07410和GBW0741 1的Hf、Ta,GBW 07426的Gd、Ta,本文给出了相应的参考值. 相似文献