抄録
Recently, in order to improve hot workability of high grade stainless steel, adding rare earth metals in a bath have been widely taken in stainless-steel melting practice. As regards determination of Ce in steels, W. Westwood and A. Mayer2) reported in their paper that Ce in cast iron was separated from iron by using citric acid ammonia buffer solution, then extracted with chloroform and at last determined by oxine colorimetry.
To determinate Ce in stainless steel which was treated with misch-metal, the author made some experiments concerning the following matters:
(i) Separability of all rare earth metals from the steel using HF solution.
(ii) Applicability of Knorre's method to Ce in separated rare earth metals.
As a result of experiments, the author ascertained applicability of Knorre's method to determine the Ce in steel.
