This application describes a method for determining the content of benzene and toluene in motor and aviation gasoline using an Agilent 6820 gas chromatograph (GC) system and ASTM Method D3606. The method uses an internal standard to calculate the concentration of each component and employs Agilent Cerity NDS software for GC control and data analysis. This application demonstrates that calibration and precision meet or exceed the ASTM D3606 specifications.
This document details an application method for analyzing benzene and toluene in finished motor and aviation gasoline using the Agilent 6820 gas chromatographic (GC) system. The method utilizes a flame ionization detector (FID) and a 6-port valve configuration with OV-101 and TCEP columns, differing from the standard ASTM D3606 method which typically uses a thermal conductivity detector.
The note provides specific experimental configurations, including hardware components like the G1180A GC, 152 packed inlet, and 215 FID. It outlines the method description involving a two-column series setup with a switching valve to separate lighter components from heavier ones. Instrument conditions, such as inlet and detector temperatures set to 250 °C, and flow rates are specified. The document also covers calibration procedures using methyl ethyl ketone as an internal standard and presents results demonstrating that the method meets or exceeds ASTM D3606 specifications for linearity and repeatability.
| Inlet Temperature | 250 °C |
|---|---|
| Detector Temperature | 250 °C |
| Oven Temperature | 90°C |
| Valve Temperature | 80°C |
| TCEP Flow | 40 mL/min |
| OV-101 Flow | 40 mL/min |
| Air Flow | 350 mL/min |
| Hydrogen Flow | 40 mL/min |
The method uses a flame ionization detector (FID), which is noted as easier to maintain than the thermal conductivity detector (TCD) used in the standard ASTM D3606.
Agilent Cerity NDS software is used for 6820 GC control and data analysis.
The correlation (R²) of both benzene and toluene exceeds 0.999.