ASTM Method D 5580-94 is a standard method for analyzing the aromatic content of gasoline. This method uses an Agilent 6890 Series gas chromatograph system, including the Agilent ChemStation and automatic liquid sampler. This method can analyze benzene, toluene, ethylbenzene, p/m-xylene, o-xylene (BTEX), C9+ aromatics, and total aromatics in gasoline.
The document details a guaranteed analyzer configuration based on the Agilent 6890 Series gas chromatograph, including the ChemStation software and automatic liquid sampler, designed to meet ASTM Method D 5580-94 requirements. This method is used to analyze benzene, toluene, ethylbenzene, xylenes, and total aromatics in finished gasolines, addressing interference issues found in other methods when oxygenates are present.
The AC Aromatics Analyzer configuration utilizes a split/splitless inlet, a ten-port valve, two chromatographic columns (a micropacked TCEP precolumn and a capillary column), and a flame ionization detector (FID). The process involves two separate analyses to quantify specific components, with a total analysis time of approximately 45 minutes. The note provides specific hardware and software options, chromatographic operating parameters, and sample chromatograms demonstrating the separation of aromatics from non-aromatics and oxygenates.
| Analysis Time | approximately 45 minutes |
|---|---|
| Injection port temperature | 200°C |
| FID temperature | 250°C |
| Oven temperature initial | 60°C |
| Oven temperature final | 120°C |
| Valve temperature | 80°C |
| Carrier gas | Helium |
| Split ratio | 11:1 |
| Flow to TCEP precolumn | 10 mL/min |
| Flow to WCOT capillary column | 10 mL/min |
| Split vent flow | 100 mL/min |
The total analysis time, including two separations and the report, is approximately 45 minutes.
The system is optimized to perform analysis according to ASTM Method D 5580-94.