This application note covers the determination of individual hydrocarbon components of spark ignition engine fuels. The method is commonly referred to as detailed hydrocarbon analysis, or DHA.
The document details a method for detailed hydrocarbon analysis (DHA) of spark ignition engine fuels and oxygenate blends, complying with ASTM D 6729. It utilizes a Varian 450-GC Gas Chromatograph equipped with a Varian CP-8400 Autosampler and FID detection. The analysis employs a Varian CP-Sil PONA CB column and the Galaxie GC Workstation with integrated DHA software.
| Column | Varian CP-Sil PONA CB, 100 m x 0.25 mm x 0.5 um |
|---|---|
| Sample Size | 1 pL |
| Carrier Gas | Helium, 45 psi |
| Injector Temperature | 250 °C |
| Detection Temperature | 300 °C |
| Detection Method | FID with full EFC control |
The method is applicable to mixtures containing oxygenate blends with boiling ranges up to 225 °C.
Individual component concentrations and precision are determined in the range of 0.01 to approximately 30 mass%.
The analysis is based on ASTM Standard D 6729-04.