ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1984.tb00418.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1984.tb00419.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY

摘要:

Concentration data for as many as 64 constituents in the six United States Geological Survey's (USGS) Geochemical Exploration Reference Samples (GXR) have been collected from journal articles and technical reports published since these reference materials were issued in 1971. These data are summarized into mean +/‐ one standard deviation values and compared with our previously calculated concentrations based upon USGS round‐robin data published in 1978. All new literature data located are presented in the appendi

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1984.tb00420.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY

摘要:

The bismuth content of eighty‐three geochemical reference samples has been determined by atomic absorption spectrometry using either a hydride generation and heated quartz cell atomizer or a solvent extraction and carbon tube atomizer. The agreement between the present results and published data is generally goo

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1984.tb00421.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY

摘要:

Une méthode radiochimique est utilisée pour le dosage de huit éléments de terres rares, après préconcentration à l'aide de résines d'échange des ions cationiques. La reproductibilité et la justesse des résultats sont vèrifiès par l'analyse de deux èchantillons géochimique

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1984.tb00422.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY

摘要:

Results are presented for gallium in six South African primary rock standards (NIMROCS) and in twelve secondary rock standards (SAROCS). A selective ion exchange procedure is used to separate gallium completely from all other elements, except remaining traces of thorium. It is followed by a determination of gallium with flame atomic absorption spectrometry using the nitrous oxide‐acetylene flame, after the addition of 2000 ppm lanthanum as ionization suppresso

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1984.tb00423.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY

摘要:

New analytical data on three elements are presented for the two USGS manganese nodule reference materials, Nod‐A‐1 and Nod‐P‐1. Arsenic and tungsten were determined by instrumental neutron activation analysis, and uranium by delayed‐néutro

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1984.tb00424.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY

摘要:

It is well known that the mean can be an unsatisfactory estimator of a true value if data are a poor approximation to a normal distribution or are too few in number for a normal distribution to be adequately delineated. Unfortunately, this knowledge is not always implemented in the evaluation of analytical data. The median may be used occasionally because it is recognised to be less affected by discrepent data. However, there are other ‘robust’ estimators which can be better than the simple median. This note complements a previous paper by the writer

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1984.tb00425.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY

摘要:

Granite GS‐N and Potash Feldspar FK‐N are two ANRT reference samples prepared in 1973 in 960 and 567 kg, respectively. All data reported since 1973 are compiled in this report. GS‐N and FK‐N are now well characterized for major and minor elements. As for trace elements, working values have been assigned for 36 elements in GS‐N and for 30 elements in FK‐N. We need much more data on trace elements for characterizing them better. As GS‐N and FK‐N are still available in large quantities and are certain to remain so for two or three decades to come, a plea is made for contribution of more data on

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1984.tb00426.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1984.tb00427.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY