EXPLANATION
Certain organo-manganese compounds act as anti-knock agents when added to gasoline, usually as methylcyclo-pentadienyl manganese tricarbonyl (MMT). This test method covers the determination of total manganese content of gasoline in the concentration range from 0.25 to 0.30 mg Mn/L. This test method is not applicable to gasoline containing highly cracked material (>20 bromine numbers).
TEST SUMMARY
The gasoline sample is treated with bromine and diluted with methyl isobutyl ketone. The manganese content of the solution is determined by atomic absorption spectrometry using an air-acetylene flame at 279.5 nm and standards prepared from an organo-manganese standard material.
TEST PRECISION
Where X is the mean of duplicate results.
The bias of this test method has not been determined.