日本金属学会誌

J. Japan Inst. Metals, Vol. 29, No. 5 (1965),
pp. 483-487

Quantative Analysis of Yttrium in Steel by Solution Spectrographic Analysis

Hideo Iwata1 and Mamoru Nagai2

1Analysis Method Research Laboratory, Technical Research Institute, Nippon Kokan K.K., Kawasaki
2Common Plant Facilities Sec., Fukuyama Works Construction Head Office, Nippon Kokan K.K., Tokyo

Abstract:

In order to carry out the quantative analysis yttrium in steel, a spectrographic method was applied. The solution technique with a rotating disk electrode was used, because solid standard samples for the spectrographic analysis of yttrium were not prepared and the use chipped samples was intended.
Using the Carl-Zeiss QU 24 spectrograph, effects of discharge conditions, dissolving acids (HCl, HNO3, H2SO4) and electrodes (graphite, Cu) on the sensitivity and precision of the yttrium spectral line were studied.
The result showed the optimum analytical condition to be as follows: \begin{table}

}llll} {\large Discharge condition} {\large ;  spark (L=0.8 mH, C=0.0033 μ F)}
{\large Dissolving acid} {\large ;  (1+1)HNO3}
{\large Rotating and counter electrode;  graphite}}
{\large Line pair} {\large ;  Fe 3205.4/Y 3242.3
\end{table} The reproducibility of the solution method was 3.9% in terms of the coefficient of variance in the range from 0.01%Y to 0.7%Y.
The Ti content is necessary to be less than 0.01%, because Y 3242.3 Å is affected by Ti 3242.0 Å.
If the Ti content is more than 0.01%, another line pair Fe 3659.5/Y 3664.6 can be applied. In this case, however, the reproducibility is worse in some measure than that of Fe 3205.4/Y 3242.3.
Then, as solid steel samples which contain yttrium were obtained, the content of yttrium was determined by the solution spectrographic method mentioned above and then direct excitation method of solid steel was studied by using those samples for standardization.
It was found that the same excitation conditions with those of the solution spectrographic method was also available favorably in this case, and the sensitivity and precision were almost same to those of the solution spectrographic method.


(Received 1964/12/5)

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