Determination of Trace Amounts of Pb, Mn and Co in Acidic Solution of Vanadium, Niobium and Hafnium by Graphite Furnace Atomic Absorption Spectrometry

摘要

Graphite furnace atomic absorption spectrometry (GF-AAS) using direct atomization of the acidic sample solution was studied to establish a rapid and sensitive determination procedure of trace impurities (Pb, Mn and Co) in high-purity vanadium, niobium and hafnium. The interferences of matrix elements were minimized by using the stabilized temperature platform furnace (STPF) method and thereby the sensitivity of GF-AAS in trace impurities determination was significantly improved. When the weighed amount of the sample was 1 g, the limits of detection (ppm) given by 3a of blank values were as follows: vanadium (Pb 0.12, Mn 0.02 and Co 0.07), niobium (Pb 0.06, Mn 0.02 and Co 0.07), and hafnium (Pb 0.06, Mn 0.02 and Co 0.06). The proposed procedure does not need the complicated pretreatment of the matrix elements such as ion-exchange separation or solvent extraction.