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Homogeneity Characterization of NBS Spectrometric Standards II: Cartridge Brass and Low-Alloy Steel*

Published online by Cambridge University Press:  06 March 2019

H. Yakowitz ,
D. L. Vieth ,
K. F. J. Heinrich  and
R. E. Michaelis
H. Yakowitz
Affiliation:
National Bureau of Standards, Washington, D.C.
D. L. Vieth
Affiliation:
National Bureau of Standards, Washington, D.C.
K. F. J. Heinrich
Affiliation:
National Bureau of Standards, Washington, D.C.
R. E. Michaelis
Affiliation:
National Bureau of Standards, Washington, D.C.
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Abstract

Most modern instrumental methods of analysis depend on the use of known standards of composition for calibration. Newer analytical techniques, such as the solids mass spectrometer, laser probe and, especially, the electron-probe microanalyzer have reduced the amount of a sample which can be analyzed quantitatively to a range of about 0.1 to as small as 0.00005 μg. As a corollary to these microanalytical advances, homogeneity requirements have become severe to meet analytical standards. This paper describes a continuation of the National Bureau of Standards' effort to characterize more fully existing standards as to suitability for the new microanalytical techniques. An NBS cartridge brass sample in both the wrought (NBS-1102) and chill cast forms (NBS-C1102), as well as a low-alloy steel sample (NBS-463), have been investigated by means of electron-probe micreanalysis and optical metallography. Some 17 elements are contained in the brass, while 25 elements are found in the steel. Results for 10 elements in the steel and 6 elements in the brass are presented. In the steel, iron, nickel, copper, and silicon ate essentially distributed homogeneously at micron levels, while manganese, tantalum, niobium, zirconium, sulfur, and chromium are not. In the brass, copper and zinc are distributed homogeneously at micron levels while lead, sulfur, aluminum, and silicon are not. Electron-probe micreanalyzer results indicate that both NBS-1102 and NBS-C1102 brass are suitable for use as a calibration standard for electronprobe microanalysis as well as other microsnalyticat techniques, such as the solids mass spectrometer. The results for brass have been corroborated by a number of laboratories using the electron-probe analyzer.

Type
Research Article
Information
Advances in X-Ray Analysis , Volume 9: Fourteenth Annual Conference on Applications of X-ray Analysis, August 25-27, 1965 , 1965 , pp. 289 - 303
Copyright
Copyright © International Centre for Diffraction Data 1965

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Footnotes

*

Contribution of the National Bureau of Standards, not subject to copyright.

References

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