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1.
红外碳硫分析仪测定土壤样品中的碳和硫 总被引:1,自引:0,他引:1
应用高频一红外碳硫分析仪,进行了土壤样品中碳、硫的测定,用该仪器测定土壤标准物质中碳、硫的结果与标准值符合。碳和硫11次测定的RSD分别是〈3%和〈10%。 相似文献
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Ernest S. GLADNEY Wanita EBERHARDT Richard J. PETERS 《Geostandards and Geoanalytical Research》1982,6(1):5-6
Radium-226 concentrations have been determined in 11 CCRMP reference rock and ore samples using instrumental gamma-ray spectrometry and radiochemical radon emanation procedures. Results are compared to the best available data. 相似文献
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The preparation of two chromium ores as reference materials is described and the procedures used in the measurement of the homogeneity of the samples are outlined. Statistical analysis of the data submitted by 32 laboratories that resulted in the certification of the samples is presented. Certified values have been assigned for 11 constituents in the one sample and for 10 in the other sample. Provisional values have been assigned for FeO in both samples and CaO in one of the samples. 相似文献
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Determination of Selenium in Twenty Geological Reference Materials by Neutron Activation And Inorganic Ion Exchange 总被引:1,自引:0,他引:1
Twenty geological reference samples have been analyzed for selenium using thermal neutron activation followed by radiochemical separation of 75 Se. Data are presented for 3 NBS, 11 USGS, and 6 CCRMP materials. 相似文献
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Katharina Marger Matthieu Harlaux Andrea Rielli Lukas P. Baumgartner Andrea Dini Barbara L. Dutrow Anne‐Sophie Bouvier 《Geostandards and Geoanalytical Research》2020,44(3):593-615
Six tourmaline samples were investigated as potential reference materials (RMs) for boron isotope measurement by secondary ion mass spectrometry (SIMS). The tourmaline samples are chemically homogeneous and cover a compositional range of tourmaline supergroup minerals (primarily Fe, Mg and Li end‐members). Additionally, they have homogeneous boron delta values with intermediate precision values during SIMS analyses of less than 0.6‰ (2s). These samples were compared with four established tourmaline RMs, that is, schorl IAEA‐B‐4 and three Harvard tourmalines (schorl HS#112566, dravite HS#108796 and elbaite HS#98144). They were re‐evaluated for their major element and boron delta values using the same measurement procedure as the new tourmaline samples investigated. A discrepancy of about 1.5‰ in δ11B was found between the previously published reference values for established RMs and the values determined in this study. Significant instrumental mass fractionation (IMF) of up to 8‰ in δ11B was observed for schorl–dravite–elbaite solid solutions during SIMS analysis. Using the new reference values determined in this study, the IMF of the ten tourmaline samples can be modelled by a linear combination of the chemical parameters FeO + MnO, SiO2 and F. The new tourmaline RMs, together with the four established RMs, extend the boron isotope analysis of tourmaline towards the Mg‐ and Al‐rich compositional range. Consequently, the in situ boron isotope ratio of many natural tourmalines can now be determined with an uncertainty of less than 0.8‰ (2s). 相似文献
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Wang CHUNSHU Yan MINGCAI Zhang WENHUA Chi QINGHUA Gu TIEXIN 《Geostandards and Geoanalytical Research》1996,20(1):57-64
In 1990, the Institute of Geophysical and Geochemical Exploration prepared a series of certified reference materials of synthetic silicates and limestones. The silicate series (GSES I * ) is composed of 11 samples with 28 ingredient elements and the limestone series (GSES II*) is composed of 9 samples with 29 ingredient elements. The standard series were prepared in ascending element concentration order of 1, 2 and 5. The synthetic standards were analyzed by a large number of laboratories with various reliable methods and then certified values were derived. 相似文献
9.
干法灰化和微波消解-电感耦合等离子体发射光谱法测定植物样品中22个主次量元素 总被引:7,自引:6,他引:7
采用干法灰化和微波消解两种样品分解方法处理植物试样,用电感耦合等离子体发射光谱法测定样品中铝、钡、钙、铜、钾、镁、钠、铁等22个主、次量元素的含量,用两种前处理方法对国家一级标准物质进行测定,比对测定值与标准值,验证两种方法的准确度和精密度。结果表明,不同的样品分解方法对各元素的测定结果会产生不同程度的影响。选择适宜的分解方法可以大大提高植物样品中铝、铁、硫等元素测定结果的准确度。干法灰化和微波消解两种前处理方法的精密度(RSD,n=11)均小于5%。 相似文献
10.
Mercury was determined in thirty‐three international stream sediment and soil reference samples (eleven Chinese soils, GSS‐1 to GSS‐11; twelve Chinese stream sediments, GSD‐1A to GSD‐12; four Canadian stream sediments STSD‐1 to STSD‐4; South African stream sediments, SARM‐42, SARM‐46 and SARM‐47; Japanese stream sediments, JSd‐1 to JSd‐3) by direct mercury analyser. Samples were taken in 500 μl quartz boats, placed in an auto sampler and processed (drying time 60 s at 300 °C; decomposition time 120 s at 850 °C; waiting time 45 s). The instrument was calibrated in the low (0‐50 ng) and high ranges (50‐500 ng) with two reference materials GSS‐5 and GXR‐2 (USGS). Using the calibration line, reference samples were analysed for Hg. The results of the determinations agreed with the recommended values of RMs in all cases except JSd‐1. The RSD calculated for the RMs was found to be within 20%. The detection limit was 1 ng g?1. 相似文献
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A large number of certified and other reference samples are available for use in analytical geochemistry. Certified materials are preferred, but of much more limited availability than other reference samples for most geochemical applications. The availability of rock, sediment, soil, water, and plant reference samples is outlined; ore and mineral separate reference samples are not included in the discussion. The preparation of these materials, including the establishment of certified or recommended concentrations, is then reviewed. It is shown that comparable quality can be achieved for both certified and recommended concentrations, though it has not always been achieved in the past. Finally, the most appropriate ways to use reference samples in quality control and instrumental calibration are discussed. 相似文献
13.
This brief contribution presents new boron isotopic data for a set of proposed borosilicate reference minerals, most of which are described in the companion paper by Dyar et al.2001 . The results for a variety of minerals (tourmalines, danburite, prismatine, serendibite, ferroaxinite and a Li mica) show that it is generally possible to reproduce the 11 B/10 B ratio within ± 0.5 per mil with replicate chemistry and mass spectrometry over long time spans. Because the accuracy of boron isotopic analysis is commonly determined by reference to secondary standards, it is suggested that some of the samples used in this study be adopted for interlaboratory comparisons and for quality control on boron isotopic analyses produced by a variety of analytical methods. 相似文献
14.
Boron and Oxygen Isotope Composition of Certified Reference Materials NIST SRM 610/612 and Reference Materials JB-2 and JR-2 总被引:1,自引:0,他引:1
Simone Kasemann Anette Meixner Alexander Rocholl Torsten Vennemann Martin Rosner Axel K. Schmitt Michael Wiedenbeck 《Geostandards and Geoanalytical Research》2001,25(2-3):405-416
We present data on the concentration, the isotope composition and the homogeneity of boron in NIST silicate glass reference materials SRM 610 and SRM 612, and in powders and glasses of geological reference materials JB-2 (basalt) and JR-2 (rhyolite). Our data are intended to serve as references for both microanalytical and wet-chemical techniques. The δ11 B compositions determined by N-TIMS and P-TIMS agree within 0.5% and compare with SIMS data within 2.5%. SIMS profiles demonstrate boron isotope homogeneity to better than δ11 B = 2% for both NIST glasses, however a slight boron depletion was detected towards the outermost 200 μm of the rim of each sample wafer. The boron isotope compositions of SRM 610 and SRM 612 were indistinguishable. Glasses produced in this study by fusing JB-2 and JR-2 powder also showed good boron isotope homogeneity, both within and between different glass fragments. Their major element abundance as well as boron isotope compositions and concentrations were identical to those of the starting composition. Hence, reference materials (glasses) for the in situ measurement of boron isotopes can be produced from already well-studied volcanic samples without significant isotope fractionation. Oxygen isotope ratios, both within and between wafers, of NIST reference glasses SRM 610 and SRM 612 are uniform. In contrast to boron, significant differences in oxygen isotope compositions were found between the two glasses, which may be due to the different amounts of trace element oxides added at ten-fold different concentration levels to the silicate matrix. 相似文献
15.
热水解-离子色谱法连续测定地质物料中的氟、氯和硫 总被引:2,自引:0,他引:2
研究报导了一种快速、高效和无干扰地测定地质物料中氟、氯和硫的热水解离子色谱方法。自行设计和组装了热水解装置。实验研究和选择了热水解条件、离子色谱测定的最佳工作状态,从而获得了准确可靠的结果。用本法对10个地球化学标准参考样(GSR-3,6;GSS-1,3,6,8;GSD-11,12)进行分析测定,其结果与这些标样的最佳估计值和推荐值非常一致。该方法的检出限分别为:氟6.6ppm;氯30.8ppm;硫酸根36.8ppm。方法的精密度(RSD,%)对氟含量为577ppm,氯含量为70ppm和硫酸根含量为420ppm的样品来说,分别为1.8%,12.3%和3.8%。 相似文献
16.
F. J. FLANAGAN L. J. SCHWARZ J. J. ROWE A. F. DORRZAPF JR 《Geostandards and Geoanalytical Research》1977,1(1):61-66
The available clay and feldspar reference samples, rather than the frequently used rock reference samples, are suggested as standards for archaeological pottery studies because their trace-element contents are more like those of the artefacts. Such samples may provide a basis for correlating archaeological studies throughout the world. The assumption that bottles of such reference samples should have homogeneous trace-element contents because of the nature of the materials has been confirmed by the analysis of variance of trace -element data by instrumental neutron activation analysis. 相似文献
17.
Reference Materials for Geochemical Studies: New Analytical Data by ICP-MS and Critical Discussion of Reference Values 总被引:13,自引:0,他引:13
Peter Dulski 《Geostandards and Geoanalytical Research》2001,25(1):87-125
Abundances of twenty four trace elements, including Y and fourteen rare earth elements (REE), are reported for eighty six geological reference materials and four proficiency testing samples. Analytical data were obtained by ICP-MS using solution nebulisation after mixed acid digestion (HF-HClO4 ) under pressure. Analysed samples cover a wide range of element concentrations and mineralogical compositions, including samples for which there are few previously published data. Precision for elemental determinations in nearly 90% of the samples analysed is better than 5%. Accuracy, estimated by comparison with data from compilations is better than 6% for well characterized reference materials. Results obtained for samples that are low in trace elements are often significantly lower than compiled reference values. A critical discussion of the compiled data sets, especially for Y and the REEs, indicates that some reference values seem to be erroneous. 相似文献
18.
Ming Yang Yue‐Heng Yang Noreen J. Evans Lie‐Wen Xie Chao Huang Shi‐Tou Wu Jin‐Hui Yang Fu Yuan Wu 《Geostandards and Geoanalytical Research》2020,44(3):553-565
In this contribution, we report Hf isotopic data and Lu and Hf mass fractions for thirteen Chinese rock reference materials (GBW07 103–105, 109–113 and 121–125, that is GSR 1–3, 7–11 and 14–18, respectively) that span a broad compositional range. Powdered samples were spiked with a 176Lu‐180Hf enriched tracer and completely digested using conventional HF, HNO3 and HClO4 acid dissolution protocols. Fluoride salts were dissolved during a final H3BO3 digestion, and chemical purification was performed using a single Ln resin. All measurements were carried out on a MC‐ICP‐MS. This work provides the first comprehensive report of the Lu‐Hf isotopic composition of Chinese geochemical rock reference materials, and results indicate that they are of comparable quality to the well‐characterised and widely used USGS and GSJ rock reference materials. 相似文献
19.
DETERMINATION OF TRACE ELEMENTS IN 11 CHINESE GEOLOGICAL REFERENCE MATERIALS BY ICP-MS 总被引:1,自引:0,他引:1
More than 40 trace elements in 11 Chinese geological reference materials (stream sediments) GSD-1 to GSD-7 and GSD-9 to GSD-12 were determined by inductively coupled plasma-mass spectrometry (ICP-MS). Open acid digestions were used to prepare samples for the determination of most elements. However, for the measurement of Y, Zr and Hf, it was found necessary to use an alkali fusion in order to make fully quantitative measurements. The results obtained in this work are generally in good agreement with the recommended values from the sub-ppm level to > several hundred ppm and illustrate the versatility of the technique, particularly for some less well characterised elements. 相似文献
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Chunhan TONG 《Geostandards and Geoanalytical Research》1990,14(1):7-10
Values for gold in a series of three reference samples selected from Gueizhou Province, China, were recommended by the Institute of Mineral Comprehensive Survey, Zhengzhou Department, in June 1986. Because of the large amount (1360 to 2600 Kg) of the three samples collected, the contents of 26 elements other than gold were determined to see if the large samples might also serve as general geochemical reference samples. 相似文献