2003 Volume 89 Issue 9 Pages 967-972
Evaluation of trace elements in a pure iron and a pure aluminum was performed. The definitive analysis methods of steels and aluminums such as gravity, titrimetry and coulometry are applicable only for high concentration range of elements. In order to develop the definitive methods for low concentration ranges, a study group with national laboratories and steel maker laboratories was organized. The round robin tests showed that the found value by ID-ICP-MS (Isotope Dilution Inductively Coupled Plasma Mass Spectrometry) have good accuracy and good coincidence with the certified values. The found values by ICP-MS have good coincidence with certified values and/or with the found values by NAA (Neutron Activation Analysis). Trace elements less than 1 ppm could be determined by ICP-MS, however the precision should be improved by standardizing the method. The found values by both ID-ICP-MS and ICP-MS have good repeatability. Oxygen in pure iron was evaluated by round robin test using the inert gas fusion method and CPAA (Charged Particle Activation Analysis) method. Evaluation of surface-oxygen at pure iron was investigated.