摘要:

In 1978, seven uranium ore reference samples were prepared by the Bureau of Uranium Geology (China). The processing of these samples, prepared in the range of 220–370 kg, is briefly presented along with their general chemical composition. Analytical procedures employed for the determination of U, Th and Ra are briefly discussed. Recommended values are proposed for U, Th and Ra in the seven reference sample

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1983.tb00379.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

Measures of material variation (state of homogeneity) for reference materials of powdered rocks, minerals, and ores are examined critically.It is shown that the customary analysis of variance concluding with the F‐test is not a satisfactory method for the analysis of the analytical data obtained in a homogeneity experiment. It is argued that an estimation approach is more appropriate.Examples are given of values calculated from reference‐material data, together with an explanation of how the results can be interpre

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1983.tb00380.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

The beryllium and zirconium contents of 45 geochemical reference samples have been determined by inductively coupled plasma after fusion of the samples with lithium metaborate and dissolution of the melt in dilute nitric acid. The method described here is rapid and sample preparation straightforward. Good agreement is shown with previously published results for these two elements. A correction has to be made for an interference due to vanadium in determining the beryllium content, and there is a slight interference due to yttrium in the determination of zirconium. The detection limit for beryllium is about 0.2 μg g‐1and for zirconium about 15 μg g‐1in the s

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1983.tb00381.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

Data on platinum in manganese nodules by a combined fire assay‐spectrographic procedure agree reasonably well with data obtained by a fire‐assay flameless atomic‐absorption spectroscopic method. A plea is made for the contribution of much more data on Pt in these samples for arriving at valid conclusions and for showing their geochemical and economical int

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1983.tb00382.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

The rare‐earth elements (REE) content of the FER‐1, ‐2, ‐3, ‐4 canadian reference samples has been determined by neutron activation and high‐resolution X‐ray or γ‐ray spectrometry. As these rocks are included in a new project of standardisation, the present results have not been compared

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1983.tb00383.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

Fluorine in 22 international reference samples has been determined with an ion selective electrode following fusion with a Na2bCO3‐ZnO mixture. To eliminate the effect of fluorine complexes in the solutions, the results presented are means of fluoride determinations from a standard calibration curve and from the method of standard addition. Together with these new determinations an updated compilation of USGS‐I reference samples is presen

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1983.tb00384.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

The concentrations of bromine and iodine in USGS reference material MAG‐1 were determined by standard addition with secondary‐source x‐ray fluorescence spectrometric detection. Three determinations of bromine in the same sample yielded 311, 309 and 346 μg Br/g solid. The iodine content was found to be 380 μg I/g solid. The determination of bromine in a second bottle of MAG‐1 (266 ± 9 μg Br/g) indicated that a large variation in halogen concentration may exist between samples of this referen

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1983.tb00385.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

Instrumental neutron activation analysis has been applied to the analysis of recently issued NBS reference materials SRM 1633a Fly Ash and SRM 1632a Bituminous Coal. Only the nuclides with half‐lives of less than 48 hours have been used. The results for the determination of 18 elements (Fly Ash) and 19 elements (Coal) are compared with the values given by NBS and with recent results obtained by other investigator

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1983.tb00386.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

The beryllium content of eighty geological reference samples has been determined by atomic absorption spectrometry using a nitrous oxide‐acetylene flame or a carbon tube atomizer, after extraction of beryllium as acetylacetonate with methylisobutylketone (MIBK). The agreement between the present results and published data is generally goo

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1983.tb00387.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

The concentrations of 20 trace elements in 6 British Chemical Standards (BCS) reference materials and 5 European Federation of Refractories Producers (PRE) reference materials have been determined by X‐ray fluorescence spectrometr

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1983.tb00388.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY