ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1992.tb00501.x

出版商:Blackwell Publishing Ltd    

年代:1992

数据来源: WILEY

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1992.tb00478.x

出版商:Blackwell Publishing Ltd    

年代:1992

数据来源: WILEY

摘要:

The sulfur concentration has been determined in five bauxite and two sediment NIST Standard Reference Materials (SRM) by isotope dilution thermal ionization mass spectrometry (ID‐TIMS). Two outside laboratories had indicated that the original certified values in the bauxites SRMs were too high by as much as 93 percent. The ID‐TIMS determinations reported here confirm that the certified values on all bauxites contained a positive bias. The sulfur concentrations obtained in this study are the following (in μgS/g, dry weight basis): SRM 69b ‐ 2208 ± 25, SRM 696 ‐ 601 ± 8, SRM 697 ‐ 308 ± 7, SRM 698 ‐ 575 ± 16 and SRM 600 ‐ 622 ± 24. The values for the sediment samples are the following (in weight percent sulfur dry weight basis): SRM 2704 ‐ 0.3970 ± 0.0039 and SR

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1992.tb00479.x

出版商:Blackwell Publishing Ltd    

年代:1992

数据来源: WILEY

摘要:

Gold has been determined in 26 geochemical reference samples with graphite furnace AAS after digesting the samples with aqua regia and hydrofluoric acid and extracting gold by methyl isobutyl ketone (MIBK). This method yields clearly higher values than those by the partial attack using aqua regia digestion.

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1992.tb00480.x

出版商:Blackwell Publishing Ltd    

年代:1992

数据来源: WILEY

摘要:

Vanadium in twenty‐eight international geostandards was determined spectrophotometrically after selectively extracting vanadium as its red NBPHA complex. In general, the results compare favorably with the published value

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1992.tb00481.x

出版商:Blackwell Publishing Ltd    

年代:1992

数据来源: WILEY

摘要:

An updated REE measurement of Gabbro GOG‐1 was carried out by means of secondary ion mass spectrometry (SIMS). The availability of high amount of rock powder allowed the sample to be well ground and homogenized before analysis. Fused glass pellets were employed for SIMS investigations. REE data were compared with new ICP‐AES and NAA analyses. REE results from all employed analytical techniques show good agreement and are consistent within‐situSIMS measurements of REE in major mineral phases forming GOG‐1. Extensive homogeneity tests seem to confirm the possibility to using this rock as a reference material for earth s

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1992.tb00482.x

出版商:Blackwell Publishing Ltd    

年代:1992

数据来源: WILEY

摘要:

Ten U.S. Geological Survey rock standards have been analyzed for trace elements by instrumental neutron activation using a low flux reactor and Ge detectors. Results compare favorably with the current working values for all elements except Mo. REE values that have been determined are generally slightly lower than accepted values. Data obtained for rocks that have very low trace element concentrations (e.g., BIR‐1) will aid in refining the working values for these standard

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1992.tb00483.x

出版商:Blackwell Publishing Ltd    

年代:1992

数据来源: WILEY

摘要:

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

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1992.tb00484.x

出版商:Blackwell Publishing Ltd    

年代:1992

数据来源: WILEY

摘要:

The concentrations of fluorine, chlorine, bromine and iodine of seven geochemical reference samples have been determined. Analytical techniques were neutron activation analysis for chlorine, bromine and iodine and ion‐selective potentiometry for fluorine. After irradiation of the samples, these halogens were separated from the matrix elements by pyrohydrolysis in presence of vanadium (V) oxide. This extraction allows to measure the four halogens in the same sampl

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1992.tb00485.x

出版商:Blackwell Publishing Ltd    

年代:1992

数据来源: WILEY

摘要:

Homogeneity studies on the geochemical exploration reference samples GXR‐1 through GXR‐6 were initially based on analyses by methods of 10–30 percent relative standard deviations (rsds). Use of the materials for high‐precision method validation requires that homogeneity be established using methods having rsds less than 1.0 percent, if possible. The current homogeneity study shows distinct in homogeneities in all GXR materials for some major, minor, and trace const

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1992.tb00486.x

出版商:Blackwell Publishing Ltd    

年代:1992

数据来源: WILEY