Abstract
The oxygen content of steel could be determined by means of a spectrographic method. A d.c. carbon-arc discharge was used to extract the oxygen as carbon nonoxide from the sample. The intensity ratio of O I 7771.9 Å/Ar I 8006.2 Å was a function of the argon pressure in the excitation chamber, current value and the oxygen content. The oxygen concentration in the range from 0.008 to 0.1 weight percent could be determined from a variant coefficient of 7∼12 percent.
