EXPLANATION
This test method covers the determination by mass spectrometry of total paraffins, monocycloparaffins, dicycloparaffins, alkylbenzenes, indans, or tetralins, or both, and napthalenes in gasoline having an olefin content of less than 3 volume % and a 95 % distillation point of less than 210° C as determined by Test Method ASTM D86. This method has not been tested on gasolines containing oxygenates such as alcohols and ethers.
TEST SUMMARY
Samples are analyzed by mass spectrometry, based on the summation of characteristic mass fragments, to determine the concentration of the hydrocarbon types. The average number of carbon atoms of the sample is estimated from spectral data. Calculations are made from calibration data which are dependent upon the average number of carbon atoms of the sample.
TEST PRECISION
Based on an interlaboratory study, the following precision was obtained.
The bias for this test method has not been determined.