ET-AAS DETERMINATION OF TRACE ANALYTES IN HIGH-PURITY BISMUTH AND TELLURIUM OXIDES

Optimal conditions for direct electrothermal atomic absorption (ET-AAS ) determination of Al, Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb, and V in high p urity bismuth oxide and tellurium oxide are described. Matrix interfer ence on the atomization of the analytes is studied. The analytical met hod developed in this paper permits determination of 0.005 mu g g(-1) Cd and Mn; 0.02-0.05 mu g g(-1) Al, Cu, Cr, and Fe; 0.1 mu g g(-1) Co, Ni, and Pb; 0.5 mu g g(-1) V with relative standard deviation 3-8%. ( C) 1996 Academic Press, Inc.