Abstract

A simplified dilution method is described for the analysis of powdered samples of unknown origin and composition. The sample is mixed with an equal amount of graphite powder containing the reference element, germanium. A small amount of this mixture is placed in a 1-mm-deep, 1-mm-diameter crater drilled in the end of a 3/16-inch graphite electrode. Apparently, the diluent is essentially provided by the electrode during arcing. This rapid approximate method has an average accuracy that is acceptable for many purposes. The method also permits the determination of the relative amounts of the elements in a very small sample (ca 1 mg).

© 1957 Optical Society of America

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References

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  1. See, for instance, W. R. Brode and D. L. Timma, J. Opt. Soc. Am. 39, 478 (1949); L. H. Ahrens, Spectrochemical Analysis (Addison-Wesley Press, Cambridge, 1950), Chap. 8.
    [Crossref]
  2. E. K. Jaycox, Anal. Chem. 27, 347 (1955).
    [Crossref]
  3. B. J. Stallwood, J. Opt. Soc. Am. 44, 171 (1954).
    [Crossref]

1955 (1)

E. K. Jaycox, Anal. Chem. 27, 347 (1955).
[Crossref]

1954 (1)

1949 (1)

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Figures (5)

Fig. 1
Fig. 1

Spectrograms of Fe-Al mixture in different matrices. (Equal weight of graphite-germanium mixture added.)

Fig. 2
Fig. 2

Silicon—calibration curve.

Fig. 3
Fig. 3

Iron—calibration curve.

Fig. 4
Fig. 4

Schematic diagram illustrating the calculation of the concentration ratio (a/b) of two elements having lines of equal intensity.

Fig. 5
Fig. 5

Diagram illustrating changes in the calculated values of the concentration ratio (a/b) caused by nonlinearity of the calibration curves.

Tables (4)

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Table I Standards used in preparing the calibrations.

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Table II Analytical lines used.a

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Table III Comparison of spectrographic and chemical results—percent.

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Table IV Estimation of relative amounts in three known samples.