ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1979.tb00233.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1979.tb00234.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

Since 1967–68, two mica reference samples, Biotite Mica‐Fe and Phlogopite Mica‐Mg, were made available to several geochemical laboratories. The analytical data reported during the past ten years by 142 geoanalysts belonging to 74 international laboratories are presented and assessed for deriving preferred values. Reaomrmended or proposed values are assigned for major, minor and several trace elements. The biotite Mica‐Fe is better characterized for its chemical composition than the Phlogopite Mica‐Mg. Both the samples are also proposed as geochronological standards. Because very few mica reference samples have been processed in large quantities, the international geochemiaal community is invited to contribute further us

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1979.tb00235.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

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.

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1979.tb00236.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

Data on the content of phosphorus and chlorine in eight new U.S.G.S. standard rooks obtained by radiochemical neutron activation analysis are presented and discussed.

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1979.tb00237.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

18 geoahenrical reference samples have been analysed for iodine using an automated photometric method. Few comparative values are available in the literature but of the six that are available four show good agreement with the data reported. In all but one case the values obtained are less than 0.3 ppm, the exception being a bauxite (B.C.S. 395) with 8.8 ppm I.

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1979.tb00238.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

Nine CRPG and ANRT reference samples have been analyzed for Hg by flameless atomic absorption spectrophotometry. Preliminary data are given but mercury homogeneity has not been tested. Results of determinations on USGS samples are reported and compared with available literature values.

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1979.tb00239.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

The niobium concentrations in 15 U.S.G.S. standard rocks were measured by neutron activation analysis. The niobium was separated from the rock matrix (in the presence of95Nb tracer, which was used to measure the fraction recovered) before irradiation to improve the sensitivity. Results of this work are compared with those obtained by other techniques. Some results obtained by multielement X‐ray fluorescence procedures agree well with the present data, but a systematic disagreement exists between these and the spectrophotometric dat

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1979.tb00240.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

60 geochemical laboratories from the world over, contributing in all 3687 bits of chemical data on 60 elements, haue willingly participated in the study of SOIL‐5 as a reference material. The preparation of SOIL‐5 in 45 kg and homogeneity teats are described; in addition, all the data compiled are presented.In evaluating the compiled data, the use of four concurrent tests for outlier‐rejection at the same level of significance, has been applied. After proper statistical treatment, “recommended values” could be established for 31 elements, most of them trace elements and “information values” for 29 elements. 23 of the recommended values could be given with a “relatively high” degree confidence whereas the other 18 recommended Values with a “reasonable” degree of confidence.An attempt is made to compare the analytical methods employed; the existence of possible sy3tematic diffe

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1979.tb00241.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

The authors have used a high‐purity multielement solution, containing known quantities of individual Pare earth elements, as a reference standard in neutron activation analysis of rare earths in several international standard rocks. The data obtained by the authors have been compared with those obtained using the international standard rock Basalt BCR‐1 as a reference material. The authors’data compare favourably with those obtained by other workers, particularly for the more basic rock types, and encourages the authors to suggest that a multielement solution standard can be used successfully for neutron activation analysis of rave earth elements. High values obtained for Ce in Basalt BCR‐1, however, might indicate that the behaviour of Ce in solution needs further invest

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1979.tb00242.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY