A method is described for the determination of Ag, As, Bi, Cd, Cu, Ge, In, Pb, Sb, Sn, Te, and l 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 MoO 3 , 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 MoO 3 -base synthetic standards is used.
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Golden et al. (1970) studied this question.
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