ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1983.tb00370.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

Elemental composition data on eight older (AGV‐1, BCR‐1, DTS‐1, G‐1, G‐2, GSP‐1, PCC‐1 and W‐1) and three newer (BIR‐1, DNC‐1 and W‐2) USGS rock standards have been collected from institutional reports and journal articles from 1972–1981. This collection was combined with data from previous compilations and “consensus values” for up to 79 elements determined by comparing overall means, medians, and individual means bas

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1983.tb00371.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

Copper in S.A. primary (NIMROCS) and in six secondary reference samples has accurately been determined by means of atomic absorption spectrometry. A selective ion exchange separation procedure, using a 20 g column of AG50W‐X8 cation exchange resin and 0.2 M hydrochloric acid and 0.5 M hydrobromic acid, both containing 85% acetone, is employed for the separation of copper from all other elements, except vanadium. Vanadium which can partially accompany copper, however, is separated at the start of the sorption step with 0.01 M nitric acid‐0.15% hydrogen peroxide. Accuracy and precision of the described method are demonstrated by the analysis of synthetic rock solutions containing various amounts of copper. Amounts of 10 and 100 μg of copper can be determined with a coefficient of variation of 0.3% and 0.2%, respecti

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1983.tb00372.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

Details on the preparation of a Laterite Standard Reference Material (SRM) from Venezuela, on the homogeneity‐testing and the round‐robin testing scheme from 11 international laboratories are given. The proposed values (%) for the concentrations of the main constituents are: Al2O3: 37.38, SiO2: 1.16, TiO2: 3.15, Fe2O3: 35.77 and LOI, 22.44. The following statistical parameters are also reported: the arithmetic mean, the variance, the standard deviation, the coefficient of variation, the median, the skewness factor, the preferred mean, the geometric mean, the Gastwirth Median and the dominant cluster m

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1983.tb00373.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1983.tb00374.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1983.tb00375.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1983.tb00376.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1983.tb00377.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

ISSN:0150-5505    

DOI:10.1111/j.1751-908X.1983.tb00378.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY