Manganese in Gasoline

Application Note EDXRF1760

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The measurement of manganese (Mn) in gasoline is demonstrated.


Methylcyclopentadienyl manganese tricarbonyl (called MMT or MCMT) is an anti- knock agent added to motor gasoline and AvGas to boost octane rating, replacing tetraethyl lead (TEL) in many regions of the world. In motor gasoline, the Mn content is typically between 50 – 500 mg/kg, and can be as high as 3000 mg/kg (approximately 3 g/L) in AvGas. Reliably characterizing the Mn content of gasoline ensures optimum engine performance based on the engine’s compression ratio and other geometrical and mechanical operating conditions. To meet the needs of the industry, Rigaku offers NEX QC+, a simple and versatile benchtop EDXRF analyzer for the analysis of manganese in gasoline.

NEX QC+ high-resolution EDXRF analyzerModel: NEX QC+


Empirical calibration is made using commercially available certified gasoline calibration standards containing the Mn additive. A typical calibration is demonstrated here for the range 25 – 500 mg/kg Mn.

Element: Mn
Units: mg/kg
Standard I.D. Assay value Measured value
1 25 24.2
2 50 47.4
3 100 101
4 200 204
5 350 349
6 500 499

EDXRF1760 Calibration plot MnCalibration plot Mn


Instrument repeatability (precision) is determined by ten repeat analyses of each sample in a static position.

Element: Mn
Units: mg/kg
Sample I.D. Assay value Average value Std. dev % Relative
1 25 23.5 0.6 2.6%
3 100 101 1.4 1.4%
6 500 501 4.2 0.8%


The results shown here indicate the Rigaku NEX QC+ EDXRF analyzer can be used to reliably measure Mn in gasoline and AvGas without the need to use an internal standard.

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