Bestimmung von Elementspuren in Reinst-Cadmium durch Atomabsorptions-Spektrometrie nach Anreicherung durch partielles Lösen der Matrix

Trace elements such as Ag, Au, Bi, Co, Cu, Fe, In, Ni, Pb, Pd, and Sn can be preconcentrated from high-purity cadmium by partial dissolution of the matrix. The samples are coated by a thin film of mercury and dissolved in hydrobromic acid up to a small residue. In this residue the trace elements are enriched with recoveries of more than 95%. The elements are determined by AAS. For 10 g Cd the factor of enrichment is about 10², and the limits of detection are in the range of 0.1 ppm. The relative standard deviation was calculated to be about 5%. Reasons influencing the recovery of the trace elements are discussed.