Abstract
An atomic absorptiometric method was investigated for the determination of trace amount of calcium in steel. With the use of N2O-C2H2 flame and of the inhibitor (KI+I2O5), the effects of Fe, Al, and Ti were eliminated and a directly determining method was obtained with a high sensitivity. The present method was compared with the emission spectrographic one and they agreed with each other. The acid insoluble residue was also determined and was in only a negligible trace amount, being under the lower limit of this method. Applying to calcium-containing low alloy steels and high alloy steels (18-8 stainless and high speed steel etc.) the results showed a good precision of the lower limit of 1 ppm and the standard deviation of 1.6-2.4ppm.
