Problems in Determining the Noble Metals in Ores.
Atomic Absorption Newsletter 1973 12(3):60-62
Disagreement between our laboratory and two commercial laboratories over the analyses of ores alleged to contain platinum and gold has led to a study of atomic absorption methods used by the outside laboratories. In their procedures, the sample is digested in acid, filtered, and analyzed by atomic absorption. The Bureau of Mines has made tests on known samples, duplicating outside laboratory procedures as closely as possible, and from results of continuum lamp studies has identified the sources of error as scattering and/or broad band molecular absorption. Errors due to wrong assumptions as to solubility of the noble metals were also demonstrated.
Atomic Absorption Newsletter, V. 12, No. 3, May-June 1973, PP. 60-62