Comparison of UV Fluorescence Method and EDX-Ray Fluorescence Method in Determination of Sulfur Content of Export Gasoline

Comparison and analysis showed that the determination results of X-ray fluorescence method were greater than those of UV fluorescence method in 71.40% batches.The difference results in 85.47% batches were greater than the reproducibility difference requirement specified in standard,among which the greatest difference value reached-33.2mg/kg,3.13 times the corresponding reproducibility difference.Results of UV fluorescence method and factory inspection showed good reproducibility,whose mean difference was only 8.19mg/kg,while results of UV fluorescence method and factory inspection differed greatly,whose mean difference reached 23.24mg/kg,much greater than the reproducibility difference requirement specified in standard.