Abstract

The use of argon as an environment for the dc arc results in marked prolongation of volatilization, increased initial electrode currents, and enhancement of lines of many elements, particularly volatile ones, when samples are burnt to extinction and compared to helium and argon-helium mixtures. An interdependent relationship between total time necessary for complete volatilization of samples, percentage helium and argon composition of the atmosphere, and sample concentrations is demonstrated. Independently, a relationship between the electrode current, percent helium and argon, and concentration of the sample exists.

© 1952 Optical Society of America

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References

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  1. Vallee, Reimer, and Loofbourow, J. Opt. Soc. Am. 40, 751 (1950).
    [Crossref]
  2. B. L. Vallee and S. J. Adelstein, J. Opt. Soc. Am. 41, 869 (1951).
  3. B. L. Vallee and R. W. Peattie, Anal. Chem. 24, 434 (1952).
    [Crossref]
  4. Air Reduction Company No. 805–1509.

1952 (1)

B. L. Vallee and R. W. Peattie, Anal. Chem. 24, 434 (1952).
[Crossref]

1951 (1)

B. L. Vallee and S. J. Adelstein, J. Opt. Soc. Am. 41, 869 (1951).

1950 (1)

Adelstein, S. J.

B. L. Vallee and S. J. Adelstein, J. Opt. Soc. Am. 41, 869 (1951).

Loofbourow,

Peattie, R. W.

B. L. Vallee and R. W. Peattie, Anal. Chem. 24, 434 (1952).
[Crossref]

Reimer,

Vallee,

Vallee, B. L.

B. L. Vallee and R. W. Peattie, Anal. Chem. 24, 434 (1952).
[Crossref]

B. L. Vallee and S. J. Adelstein, J. Opt. Soc. Am. 41, 869 (1951).

Anal. Chem. (1)

B. L. Vallee and R. W. Peattie, Anal. Chem. 24, 434 (1952).
[Crossref]

J. Opt. Soc. Am. (2)

Vallee, Reimer, and Loofbourow, J. Opt. Soc. Am. 40, 751 (1950).
[Crossref]

B. L. Vallee and S. J. Adelstein, J. Opt. Soc. Am. 41, 869 (1951).

Other (1)

Air Reduction Company No. 805–1509.

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Figures (10)

Fig. 1
Fig. 1

Relative intensities of Nb 4058.938 (U1) and Nb 3094.183 (V1) corrected for background and calculated per minute as a function of burning time. Relative intensities below 1.0 are not shown.

Fig. 2
Fig. 2

Variation of arcing time with argon-helium mixtures necessary to attain given relative intensities, corrected for exposure times, for Nb 4058.938 (U1) and Nb 3094.183 (V1). The lines through the solid circles represent “zero relative intensity.”

Fig. 3
Fig. 3

Variation of arcing time with argon-helium mixtures necessary to attain given relative intensities, corrected for exposure times, for Cr 2860.934 (V5). The lines through the solid circles represent “zero relative intensity.”

Fig. 4
Fig. 4

Arcing time in minutes of Nb 3094.183 (V1), Sc 3613.836 (V1), Sc 4246.829 (II), Mn 2593.729 (V2), V 3102.299 (V2), Pd 3634.695 (U3) as a function of argon-helium mixtures. The squares represent concentrations of 133 p.p.m., circles 1333 p.p.m.

Fig. 5(a)
Fig. 5(a)

Total arcing time of the following lines were averaged and constitute “average total arcing time:” Sc 4246.829 (II), Sc 4023.688 (U3), Sc 3907.476 (U2), Ti 3685.195 (II), Ti 3653.496 (U2), Pd 3634.695 (U3), Pd 2763.092 (II), Sc 3911.810 (V1), Sc 3613.836 (V1), Mn 2593.729 (V2), V 3102.299 (V2), Nb 3094.183 (V1), Nb 4058.938 (U1), Cr 2860.934 (V5), Al 3082.155 (U4). Such average total arcing times were established at 133, 333, and 1333 p.p.m. and are presented as a function of argon-helium mixtures.

Fig. 5(b)
Fig. 5(b)

Average total arcing time of the 15 lines in Fig. 5(a) plotted as a function of the concentration of these elements in the matrix. 100 percent argon, 50 percent argon and 50 percent helium, and 100 percent helium were used.

Fig. 6
Fig. 6

Sum of intensities of Nb 4058.938 (U1) and Nb 3094.183 (V1) as a function of time with changing gas concentrations.

Fig. 7
Fig. 7

Reproduction of a spectrogram obtained from a sample containing 133 p.p.m. of all elements listed in Table I. The gas concentrations were, top to bottom, 100 percent argon, 67 percent argon and 33 percent helium, 34 percent argon and 66 percent helium, 100 percent helium. Exposure times as given in the text.

Fig. 8
Fig. 8

Variation of electrode current with argon-helium mixtures at different elemental concentrations.

Fig. 9
Fig. 9

Amperage per percent argon as a function of log sample concentration.

Tables (2)

Tables Icon

Table I Elements and salts added to the matrix for volatilization and enhancement studies.

Tables Icon

Table II Effect of helium, argon, and helium-argon mixtures on background-corrected relative line intensities (ILIB) sample concentration 133 p.p.m.