This application note describes a method for determining benzene, toluene, ethylbenzene, p/m-xylene, o-xylene, C9 and heavier aromatics, and total aromatics in finished gasoline using the Agilent 6820 GC System.
This document details an analytical method for determining the concentration of specific aromatic compounds in finished gasoline. The procedure utilizes a two-column configuration on an Agilent 6820 gas chromatograph equipped with flame ionization detectors (FID) and a 10-port valve, following the ASTM D5580 standard.
The method involves two separate runs to analyze different fractions of aromatics using internal standards. The first run targets benzene and toluene, while the second run analyzes ethylbenzene, xylenes, C9 and heavier aromatics, and total aromatics. The document provides specific instrument configurations, column details, valve switch timing procedures, calibration requirements, and repeatability data.
| System Type | Two-column Agilent 6820 gas chromatograph (GC) |
|---|---|
| Detectors | Two flame ionization detectors (FID) |
| Internal Standard | 2-hexanone |
| Analytical Column | HP-1, 30 m, 0.53 mm, 5-um |
| Precolumn Type | Micropacked TCEP (20%) |
| Inlet Temperature | 200 °C |
| Detector Temperature | 250 °C |
This application follows the ASTM D5580 method for determining aromatics in finished gasoline.
The method requires two runs; the first is for benzene and toluene, and the second is for ethylbenzene, xylenes, C9 and heavier aromatics.
The Cerity NDS software is used for instrument control and data analysis.