Abstract: An energy dispersive X-ray fluorescence (ED-XRF) spectrometry method was developed for the rapid determination of Fe, Ni, and V in crude oil and residual oil. The effects of matrix influence, quantitative curve fitting method and other factors on the determination results were investigated. The feasible solution of curing crude oil with curing agent was explored. The study shows that the curing agent can avoid the rapid sedimentation of Fe element in crude oil, ensure the uniform distribution of Fe in crude oil, and the data of cured crude oil are stable, accurate and reliable. The high content of elemental S in crude oil and residual oil is the biggest matrix interfering factor, and the use of the empirical coefficient method can better correct for matrix effects such as elemental S, so that the constructed method can accurately determine the content of Fe, Ni, and V in crude oil and residual oil in about 8 min. The precision of the method for the determination of Fe, Ni and V in crude oil and residual oil was less than 3%, the recoveries of the crude oil samples ranged from 95.1% to 102.7%, and the detection limits of the method for the elements of Fe, Ni and V were 0.1, 0.2 and 0.2 μg/g, respectively. The method has high analytical precision, fast sample analysis speed, and no sample pretreatment, which has great application value in crude oil fast assessment, raw material quality control and later industrial production.

Key words: ED-XRF, curing agent, matrix correction