Determination of Iron in Hydrocracking Raw Oil by Spectrophotometry

Two sensitive spectrophotometric methods were developed for the determination of iron in hydrocracking raw oil.At the range of 0.06-2.00 mg/L for Fe~(2 ) concentration,Beer's law is followed and the regression equation is A=0.397 3c-0.001 5,R~2=0.999 7 for 1,10-phenonthroline spectrophotometry.For thiocyanato spectrophotometry,Beer's law is obeyed at the range of 0-8.00 mg/L for Fe~(3 ) concentration,the regression equation is A=0.142 1c 0.007 6,R~2=0.999 9.The results show that two methods are precise and sensitive,and the determination results are consistent with that of inductively coupled plasma atomic emission spectrometry(ICP-AES).