Determination of Vanadium in Crude Oil by Spectrophotometry

Method for the determination of vanadium in crude oil by 2-(5-bromo-2-pyridylazo)-5-(diethylaminophenol)(5-Br-PADAP) spectrophotometry was studied.It pointed out that the standard curve of 5-Br-PADAP spectrophotometry was A=0.708 9c 0.017 8,R~2=0.998 9 and the determination result of Iran crude oil was 54.45 mg/L,and 30.92 mg/L of mixed Iran crude oil.The results indicate that the(accuracy) of 5-Br-PADAP spectrophotometry is sufficient compared with ICP-AES method,which deter-(mination) result of Iran crude oil is 54.68 mg/L and 30.46 mg/L of mixed Iran crude oil.