Abstract: A rapid accurate method for determination of trace pollutants in light petroleum products, including silicon, phosphorus, sulfur and chlorine-containing compounds, was established by using ED-XRF. The target material of X-ray source, matrix effect and the interfering factors for the measurement process were investigated and optimized. The validation was carried out by the standard addition. The results showed that the established method had a good linear relationship with silicon, phosphorus, sulfur, chlorine content with R² more than 0.999. The detection limits of silicon, phosphorus, sulfur and chlorine were 2.0, 0.8, 0.5, 0.2 μg/g, respectively. The adding standard recoveries were between 95.1%-105.0%，the relative standard deviation was less than 6.0%. It could be used for rapid determination and screening of harmful impurities in light petroleum products.

Key words: ED-XRF, trace elements, contaminants, light petroleum products