ĐỊNH LƯỢNG V5+ BẰNG PHƯƠNG PHÁP UV-VIS TRÊN NỀN 2-(5-BROMO-2-PYRIDYLAZO)-5-(DIETHYLAMINO) PHENOL

Tóm tắt

Spectrophotometric analysis for Vanadium (V) ion (V5+) determination with -(5-Bromo-2-pyridylazo)-
5-(diethylamino)phenol (PADAP) ligand was conducted in this study. PADAP exhibits a good
selectivity for chelating formation with V
5+, resulting in complex compound with the maximun wave
absorbance at ~580 nm. pH of solution significantly affects to position as well as intensity of
absorbance peak of V5+
-PADAP complex. At obtained optimal pH value, relation between peak
intensity and V5+ concentration in range from 150 to 1300 g/l is in good linearity, revealing out the
limit of detection (LOD) to be 199 g/l. Vanadium compounds in titana slag were recovered and
oxidized to V5+ using aqua regia for both the spectrophotometric and ICP-AES analyses. The V5+
concentration in the recovered solution from the spectrophotometric method applying PADAP was
lower 6.4% than that from the ICP-AES method. Equilibrium V2O5 content in titania slag sample was
calculated to be 0.37 %w.