The determination of palladium, platinum and rhodium in industrial concentrates such as lead foam and raw lead by neutron
activation analysis is described. The noble elements are separated from the matrix by spontaneous deposition on amalgamated
copper powder prior to activation. After the determination of palladium and platinum, rhodium is coprecipitated on iron hydroxide,
and the precipitate irradiated for the determination of rhodium. The results are compared with those obtained by fire assay.