A method is described for the spectrographic determination of trace elements in ferrous materials. The powdered sample is first mixed with PTFE (polytetrafluoroethylene) and graphite in the ratio 100:10:25. This mixture is then submitted to direct excitation in a 10 A dc arc, utilizing a capped supporting electrode of the Scribner-Mullin type, with reverse polarity (sample: negative; counter electrode: positive), the spectrum being taken from the central-cathodic region of the arc.
The method may be used to determine Al, As, B, Co, Cr, Cu, Mn, Mo, Nb, Ni, Pb, Sb, Sn, Ti, V, Zn, and Zr. The detection limits are indicated, as are data on the precision and accuracy obtainable.
ManesehiS. and BeccariaA. M., Met. Ital.54, 371 (1964).
2.
MorelloB., Met. Ital.58,317 (1966).
3.
KakitaandY.GotoH., Talanta14,543 (1967).
4.
PakalnsP. and FlynnW. W., Anal. Chim. Acta38, 403 (1967).
5.
KammoriO., Transactions I.S.I. J.9, 76 (1969).
6.
WeisbergerS.PristeraF., and ReeseE. F., Appl. Spectrosc.9, 19 (1955).
7.
HeffelfingerR. E.ChaseD. C.RengstorffG. W. P., and HenryW. M., Anal. Chem.30, 112 (1958).
8.
LifshitsE. V. and MosovaL. N., Zavod. Labor.28, 1329 (1962).
9.
EllenburgJ. Y., Anal. Chem.34,230 (1962).
10.
WhiteheadH. R., BISRA, 18th Chemists' Conference (1965), p. 63.
11.
JefferyW. C., Mod. Casting, p. 85 (Feb. 1966).
12.
PepperC. E., U. S. Atomic Energy Comm. NL CO 999, (1967).
13.
ZeidelA. N., V.S. Atomic Energy Comm. AEC-tr-5745 (1963).
14.
PszonickiL. and MinczewskiA., Spectrochim. Acta18, 1325 (1962).
15.
De GregorioP. and RossiG., Met. Ital.61, 374 (1969).
16.
SteinmetzE. and RothH., J. Less Common Metals16, 295 (1968).
17.
AharensL. H. and TaylorS. R., Spectrochemical Analysis (Pergamon Press, London-Paris, 1961).
18.
MorelloB., Metodo consigliato di analisi spettrografica quantitativa degli acciai a basso tenore di lega—AIM CRS 3-56-5, Met. Ital. “Atti e notizie”8 (1956), p. 281.
