Bestimmung von Spurenelementen in Rein-Titan durch ICP-AES ohne und mit Spuren-Matrix-Trennung

Summary Procedures for the analysis of titanium metal after dissolution in HF and HNO₃ are described. The 3 -detection limits (DL) for the determination with sequential AES in solutions of 1% titanium are about 100 ng/mL for many analytes. Investigation of the matrix interferences shows that removal of the matrix by one decade to 0.1% Ti improves DL by about 2–3 decades. Using the chelating ion exchanger Cellulose-HYPHAN in combination with hexamethylene dithiocarbamidate (HMDC) in a batch technique, the enrichment rate for the analytes Cu, Fe, Ni, Pb and V is better than 88%. Furthermore the elements Cd, Co and Zn are enriched if Chelex 100 is used in the batch mode. In a column technique 17 elements (Ag, Al, Ba, Ca, Cd, Co, Cu, Fe, Ga, In, Mg, Mn, Ni, Sn, Th, V, Zn) can be determined with enrichment rates better than 89%. Pb and Sr are collected by about 70%. Detection limits of about 1 to 10 ng/mL in the solution can be achieved (dilution factor of the metal sample about 20).