ASTM D6729 Standard Test Method for Determination of Individual Components in Spark Ignition Engine Fuels by 100 Metre Capillary High Resolution Gas Chromatography
10. Data Analysis
10.1 Compound Identification - Prepare a table listing all of the retention times of the components in the sample. Compare the retention time of each peak with that of the reference gasoline. Pay particular attention to the fact that columns can be overloaded, and peaks can shift in retention time. Observe the peak pattern so that proper identification is made by comparison with the reference material.
10.2 Consistency in peak identification can be achieved by using software (data handling software, spreadsheet software, and so forth). Alternatively, a retention index system can be used.
10.3 Determine the hydrocarbon response factors by using the following equation.
10.4 Convert the acquired areas to corrected areas by multiplying each area by its corresponding relative response factor as indicated in the following equation.
10.4.1.1 The subscript i indicates that the operations are carried out for each individual component in the matrix.
10.5 In the case of unidentified components, utilize a relative response factor of 0.800 (relative to methane).