The influences of the atmosphere and its pressure on the line-intensities in spectrographic analysis are investigated by the discharge in air and argon atmospheres.
The obtained results are the followings:
(1) When the pressure of air atmosphere is lowered below 760mmHg, it is found that the intensities of spectra of elements in steel are largely changed with the pressure.The minimum intensity is generally observed at about 200mmHg and the maximum at about 50mmHg.
(2) The influence of the pressure of argon atmosphere below 760mmHg on the line-intensities is not observed so clearly as it is seen by discharge in air.
(3) The discharge in argon atmosphere gives higher intensities than the discharge in air. This difference is found related to the affinity of each element for oxygen.
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