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1.
Results for Fluorine in Coals and Other Reference Materials 总被引：1，自引：0，他引：1
W.C. GODBEER 《Geostandards and Geoanalytical Research》1987,11(2):143-145
Results of fluorine determinations by a pyrohydrolysis-ion selective electrode method are reported for four reference coals, two fly ashes and eight rock samples. These values were obtained during a study of Australian coals which showed that the standard oxygen bomb combustion method generally used for coals gives low results. The results are compared with available literature data for these reference samples which were obtained by a variety of methods. 相似文献
2.
Shigeru TERASHIMA 《Geostandards and Geoanalytical Research》1993,17(1):123-125
Total nitrogen and carbon have been determined in 22 sedimentary rock reference samples by combustion elemental analyzer. Satisfactory agreement is observed between the present study and the published values but much more data for nitrogen are required for better comparisons. 相似文献
3.
Shigeru TERASHIMA 《Geostandards and Geoanalytical Research》1988,12(2):249-252
The contents of total carbon and sulfur in 52 international geochemical reference samples have been determined by a method of infrared absorption following combustion in a high-frequency induction furnace. A comparison with published data shows clearly the need for much more data on most samples before consensus values could be assigned.
Les teneurs en carbone et soufre totaux ont été déterminées dans 52 échantillons géochimiques de référence par combustion suivie de spectrométrie d'absorption infra-rouge. Une comparaison de ces résultats avec ceux de la littérature montre bien la nécessité de disposer davantage de données pour pouvoir fixer des valeurs de consensus. 相似文献
Les teneurs en carbone et soufre totaux ont été déterminées dans 52 échantillons géochimiques de référence par combustion suivie de spectrométrie d'absorption infra-rouge. Une comparaison de ces résultats avec ceux de la littérature montre bien la nécessité de disposer davantage de données pour pouvoir fixer des valeurs de consensus. 相似文献
4.
S. TERASHIMA 《Geostandards and Geoanalytical Research》1979,3(2):195-198
Total carbon and sulfur were determined on a variety of geochemical reference samples such as rocks, sediments, minerals and ores by a method of infrared absorption following combustion in a high-frequency induction furnace. The sample was burned with an accelerator of iron powder and tungsten chips, and the carbon and sulfur dioxide in the evolved gases have been determined directly by a simultaneous infrared analyzer. The agreement between present results and other data is generally good. 相似文献
5.
土壤环境标准样品是土壤生态环境监测质量控制的重要技术工具。目前,土壤中总有机碳环境标准样品仍为中国环境标准样品体系的空缺,特别是配套燃烧氧化-非分散红外法的土壤标准样品一直未曾问世。本文以有机碳含量较高的农用地土壤为原材料,经干燥、研磨、混匀、装瓶、灭菌等加工步骤,制备获得土壤中总有机碳环境标准样品。分层随机抽取10瓶样品进行均匀性检验,经评价统计量F小于临界值F_(0.05)(9,10),瓶间均匀性相对不确定度(u_(bb))为1.5%,样品均匀性良好。在室温避光保存条件下,对样品进行了18个月的稳定性检验,稳定性相对不确定度(u_(lts))为1.2%,样品具有良好稳定性。由中国11家实验室采用燃烧氧化-非分散红外法和重铬酸钾容量法进行协作定值,通过对检测结果的数理统计分析,样品量值评定结果为(25.2±1.4)mg/g。该标准样品为采用燃烧氧化-非分散红外法参与定值的土壤中总有机碳环境标准样品,可作为土壤中总有机碳测定标准方法配套的实物标准,满足土壤生态环境监测及相关研究需求,且与国外同类样品具有可比性。 相似文献
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7.
高精度磁测在陕北煤田火烧区的应用 总被引：1，自引：0，他引：1
通过对陕北某井田实测地面高精度磁测异常的解译,总结利用高精度磁测有效圈定煤层自燃边界的方法和经验,并通过钻孔加以验证,为以后此类工作提供了借鉴. 相似文献
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9.
Total carbon was determined in 30 geological reference materials by combustion/IR and combustion/coulometry methods. The combustion/coulometric method does not require empirical calibration and was found to be more precise than the combustion/IR method despite the use of smaller sample sizes. Carbonate carbon was determined by coulometric titration of acid-evolved CO2 . Non-carbonate carbon was calculated as the difference between the total and carbonate carbon contents. 相似文献
10.
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
11.
以铜川煤矿煤样为测试样品,利用自主研发的煤层自燃性升温的实验系统,对煤层的自燃过程进行实验模拟。根据实验测试数据对煤温与供气量以及实验过程的指标气体情况进行分析,得出煤层自燃性的临界温度、干裂温度等各个自燃特性。实验结果对煤矿分析和预测煤层自燃的过程具有指导意义。 相似文献
12.
Bernhard Schnetger Yasuyuki Muramatsu Satoshi Yoshida 《Geostandards and Geoanalytical Research》1998,22(2):181-186
Analytical results for iodine in twenty six geological reference materials (RM) are presented. Bromine, fluorine and chlorine were also determined in some samples. Pyrohydrolysis in a heated quartz tube under a wet oxygen flow was used for the separation of the halogens from the matrix and the evolved gas was absorbed in a trap solution. The halogens were measured by ICP-MS and ion chromatography (IC). All four halogens can be collected in the trap solution from one combustion procedure. The analysed samples range in type from igneous rocks to terrestrial and marine sediments. Precision, detection limits, and accuracy are also presented. 相似文献
13.
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
14.
Shigeru Terashima 《Geostandards and Geoanalytical Research》1989,13(2):277-281
The thallium content of eighty-seven geochemical reference samples has been determined by atomic absorption spectrometry using an air-acetylene flame or a graphite furnace atomizer, after extraction of thallium as chloride with methylisobutylketone (MIBK). A comparison with published data show clearly the need for much more data on most reference samples. 相似文献
15.
T.J. Bornhorst W.I. Rose S.P. Wolfe E.L. Hoffman 《Geostandards and Geoanalytical Research》1984,8(1):1-2
The gold content of eleven French geochemical reference samples has been determined by a combined neutron-activation and fire assay method. These data represent the first reported low-level and high quality gold analyses for these reference samples. 相似文献
16.
Shigeru Terashima 《Geostandards and Geoanalytical Research》1991,15(2):195-198
The silver content of seventy-three geochemical reference samples has been determined by atomic absorption spectrometry using an air-acetylene flame or a graphite furnace atomizer, after extraction of silver as iodide with methyl isobutyl ketone (MIBK). A comparison with published data shows clearly the need for much more data on most reference samples. 相似文献
17.
山东兖州东滩矿3#煤层自燃临界氧浓度指标研究 总被引：1，自引：0，他引：1
文章采用煤自燃的模拟试验装置,对兖州东滩矿3#煤层煤样在不同的氧浓度条件下(分别为21%、13%、10%、7%和5%)进行了煤样自燃过程的实验研究,分别得到了两煤样的一氧化碳浓度与煤温关系曲线、自燃氧化中氧浓度的变化曲线、不同氧浓度下的热力学特性曲线、煤样CO增率与煤温关系曲线和煤样耗氧速度与煤温关系曲线。经过分析研究得出,不同温度下反应生成的标志气体成分不同,以一氧化碳、乙烯和乙炔作为标志气体比较合适,能准确反映出煤的不同自燃阶段。对数据分析对比研究,得出东滩煤矿3#煤层的自燃临界氧浓度指标为10%。 相似文献
18.
新疆煤田火烧区特征及灭火问题探讨 总被引：4，自引：0，他引：4
煤田火烧区的存在，给勘探、建井、开矿均带来一定的危害。重点论述新疆煤田火烧区的特征、危害和主要形成因素，经过各种勘探方法的对比，选用地面物探方法(磁法和自然电场法)查清了煤层火烧区的分布范围和煤层地下燃烧状态。物探成果资料经钻孔验证技术效果良好，根据煤层高温燃烧区定期观测剖面测定结果，对新疆煤田火烧区储量的损失作了科学的推算。对煤田高温燃烧区灭火方法及灭火工程的验收程序效果提出了合理化建议。 相似文献
19.
区域地球化学样品分析质量管理计算机控制 总被引：2，自引：1，他引：1
使用通用的Microsoft Office系统中的Excel软件,根据不同项目及不同元素的内检质量和一级标准物质质量,判断分析测试质量。对区域地球化学样品分析测试质量进行计算机及局域网质量控制,利用Access工具建立数据库,编制一级标准物质质量控制表、密码检查质量控制表,制作质量监控图及打印检测报告等质量监控体系,实现对化探样品分析数据质量的管理。 相似文献
20.
John LYNCH 《Geostandards and Geoanalytical Research》1996,20(2):277-287
The collection and preparation of two soil reference samples and two till reference samples are described. Like their predecessors the LKSD series and the STSD series, the TILL series are characterized for total elements and for elements derived by partial extractions. Provisional data are presented for major, minor and trace elements. In addition, information data from a single source are provided for a number of elements derived by EPA digestions 3050 and 3051; these data allow a comparison with other partial extractions reported herein. 相似文献