Abstract
A chemical-spectrographic procedure, which involves three steps, is proposed for determining certain residual metals in steel and nickel-base alloys: (1) Dissolve the sample with a suitable acid mixture. (2) Separate the iron, chromium or nickel from the residuals by a mercury-cathode electrolysis. (3) Analyse the resulting concentrated residuals in a solution form by the rotating-disk spectrographic technique. Cobalt serves as the internal standard. Metals containing 0.003-0.10% of aluminium, calcium, vanadium and titanium can be determined accurately and rapidly with this procedure. Eight samples in duplicate may be analysed for the above elements in 12 hr.
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