1997 Volume 83 Issue 1 Pages 48-53
In the present study, analytical conditions for higher precision analysis of trace amount of carbon by atomic emission spectrometry were considered.
The results obtained are summarized as follows:
(1)(1)CI 165.8nm as a carbon spectral line and FeI 287.2nm as an internal standard spectral line, (2)spark area (time-resolving technique) as photometric area, (3)preburn:1500, analysis:1500, reverse:1000 as pulse number of discharge were most appropriate conditions.
(2)The analytical value of carbon increased 0.2ppm with 1°C rise in sample temperature before discharge. Therefore, to analyze carbon in low carbon steel accurately, the sample temperature before discharge should be adjusted to room temperature (26 27°C).
(3)Carbon intensity increased when the time intervals between analyses were prolonged. It could be depressed by cleaning discharge before analysis.
(4)By conditions showed in (1), sample temperature control and cleaning discharge before analysis, analytical repeatabilities in standard deviation at carbon concentration of 6 50ppm were 0.51.3ppm.
