摘要:

Working values for the twenty‐six CRPG, ANRT and IWG‐GIT geostandards are presented, with 95% confidence limits. In addition, the hundreds of geoanalysts who have contributed data on these reference samples are presented, with their country of ori

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1995.tb00164.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

摘要:

Six new Chinese PGE geochemical standard reference samples, GPt‐1 to GPt‐6, were analyzed by neutron activation analysis after nickel sulphide fire assay preconcentration. Analytical data on all platinum group elements are presented along with a brief description of the analytical proced

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1995.tb00148.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

摘要:

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 homogene

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1995.tb00149.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

摘要:

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 literat

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1995.tb00150.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

摘要:

The microwave oven acid digestion technique has been routinely applied to the ICP‐MS multielement analysis of whole powdered coal. Samples were treated with a mixture of HF/aqua regia/HClO4in closed Teflon PFA vessels without any pre‐treatment. Complete dissolution of the coal matrix is not required, but only one that results in quantitative and reproducible recovery of more than 40 trace elements with minimum digestion time, minimum use of reagents and minimal operator attendance. The precision of the analysis as well as the repeatability of the sample preparation procedure and precision of instrumental measurements have been evaluated. Eight coal standards, including NBS SRM 1632b, 3 South Africa Reference Materials (SARMs) 18 to 20 and 4 USA ARs 1800 to 1803 were analysed in this manner providing data for all the 14 rare earth elements along with others of geochemical interest, technological relevance as well as environmental and health concern. The results, from the ppb level to several ppm, are discussed for all the elements including detection and quantification limits, precision and accuracy. In general, good agreement was achieved with the certified and/or available published val

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1995.tb00151.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

摘要:

For the two IWG reference samples, Albite AL‐I and Iron Formation Sample IF‐G, new data on trace elements and those published in the 1984 compilation report are presented along with a brief description of their preparation in large quantities, 169 kg for AL‐I and 760 kg for IF‐G. Recommended working values with confidence limits have been assigned for over fifty major, minor and trace elements. A distinguishing feature of both the samples is their low abundances of trace e

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1995.tb00152.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1995.tb00154.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1995.tb00155.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY