Simultaneous determination of copper and iron in automotive gasoline by X-ray fluorescence after pre-concentration on cellulose paper

摘要: Abstract This paper proposes an alternative analytical method using energy dispersive X-ray fluorescence (EDXRF) to determine Fe and Cu in gasoline samples. In the proposed procedure, samples were distilled distillation residues spotted on cellulose disk form a uniform thin film produce homogeneous reproducible interface XRF instrument. The disks dried at 60 °C for 20 min copper iron determined directly solid phase 6.40 8.04 keV, respectively. calibration curves showed linear response 20–800 μg L −1 concentration range of each metal. precisions (repeatability) calculated from 15 consecutive measurements defined as coefficient variation solutions containing 100 μg L 7.8 8.1%, limits detection (LOD), analyte that gives equivalent three times standard deviation blank ( n  = 10), found be 10 15 μg L Cu, was applied determination collected different gas stations.