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 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.
AtwellM. G. and GoldenG. S., Appl. Spectrosc.24, 362 (1970).
2.
BieberC. G. and DeckerR. F., Trans. Met. Soc., AIME221, 629 (1961).
3.
WoodD. R. and CookR. M., Metallurgia1963, 109.
4.
BalfourB. L.JukesD., and ThorntonK., Appl. Spectrosc.20, 168 (1966).
5.
ThorntonK., Analyst94, 958 (1969).
6.
It has been suggested that the need for a separate single exposure could be eliminated by making the triple exposure through a two-step neutral filter or step-sector. This appears to be a satisfactory alternative.
7.
DyckR. and YelekerT. J., Methods for Emission Spectrochemical Analysis (American Society for Testing and Materials, Philadelphia, Pa., 1968), 5th ed., p. 528.
8.
RautschkeR., Spectrochim. Acta23B, 55 (1967).
9.
MorrisonG. H.RuppR. L., and KlecakG. L., Anal. Chem.32, 9322 (1960).
