Uncertainty Evaluation of the Determination of Manganese Content in Gasoline by Flame Atomic Absorption Spectrometry

The uncertainty resources of the determination of manganese content in gasoline were analyzed. Every component of the uncertainty was quantified and compounded. The results showed that when the content of manganese in the gasoline sample is about 10 mg/L, the relative uncertainty is 0.083, and the expanded uncertainty is 1.8 mg/L (the confidence level: 95%, the coverage factor k=2). Comparing the uncertainty components, it shows that the main uncertainty source is from the curve fitting process using least square method.