Abstract: A 3D fully polarized monochromatic energy dispersive X-ray fluorescence spectroscopy (3D-PMEDXRF) was developed for the determination of metal elements (Mn, Fe, Pb) and nonmetal (Si, S, Cl) in automotive gasoline, and the repeatability and accuracy of the method were also investigated. The results showed the mass fraction of six elements in motor gasoline had a good linear relationship in the range of 0-50 μg/g, and the lower detection limit of the each element could reach 1 μg/g, the relative standard deviation (RSD) of the results of repeated determination for 6 times was less than 6%, and the recovery rates were between 95%～105%, which could meet the requirements of analysis of silicon, sulfur, chlorine, manganese, iron and lead in gasoline. This method could be used to detect 6 kinds of elements in automobile gasoline at the same time, and the analysis efficiency can be improved effectively.

Key words: 3D fully polarized monochromatic energy dispersive X-ray fluorescence spectroscopy, gasoline, element analysis