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Concentration-Spectrographic Determination of Parts Per Billion of Some Impurities in Metallurgical Products

Volume 24, Number 5 (Oct. 1970) Page 514-518

Golden, G.S.; Atwell, M.G.


A method is described for the determination of Ag, As, Bi, Cd, Cu, Ge, In, Pb, Sb, Sn, Te, and Tl at the sub-part per million level in a variety of materials. The elements are concentrated as sulfides using molybdenum as a carrier. After conversion to MoO3, the residue is excited with a dc arc. Gold is used as both a chemical recovery and spectrographic internal standard. The method is applicable to any material whose matrix does not precipitate in acid sulfide solution. A single set of MoO3-base synthetic standards is used.