Spectrographic Determination of Trace Elements in Ferrous Materials

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Abstract
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.