Gas chromatograph for detecting aromatic hydrocarbons in automotive gasoline

Gas chromatograph for detecting aromatic hydrocarbons in automotive gasoline

The main components detected in gasoline are:

The interference characteristics of hydrocarbon substances in gasoline testing projects on other alcohols and ethers such as methanol are more obvious. In the real world, in order to effectively investigate and punish the human doping of industrial alcohols or ethers into gasoline, it is necessary to test the composition and content of gasoline substances according to the relevant national industry standards for gasoline testing

Gas chromatograph for detecting aromatic hydrocarbons in automotive gasolineGas flow diagram:

Aromatic hydrocarbon analysis: Non aromatic hydrocarbons, benzene, and benzene derivatives with less than C12 are directly vented after flowing out of the pre column (see Figure 1A). Before ethylbenzene flows out, switch the valve to "ON" (see Figure 1B) to transfer the retained components to the analysis column WCOT. The internal standard and C8 aromatic hydrocarbons flow out in boiling point order and enter FID detection. After the flow of ortho xylene, immediately blow back the analysis column (see Figure IC) and blow back C9 and above aromatic hydrocarbons from the chromatography column into FID detection.

GC7890 gas chromatograph (including split/non split injection ports, dual FID detection and monitoring, with automatic blowback and reset ten way switching valve)

2. Chromatographic column:

Pre column TCEP micro filled column: 0.56m long, 1/16in (lin=2.54cm) outer diameter.

Analysis column: Methyl silicone quartz capillary column: 30m long, 0.53mm inner diameter, 5.0um liquid desert thickness.

3. Data processing workstation

4. Chromatographic gas source (high-purity nitrogen, high-purity hydrogen, pure dry air)

5. Standard samples

Qualitative standard samples of alcohols and ethers

Alcohol and ether calibration standards

Internal standard 1,2-dimethoxyethane (DME)

System analysis cutting standard sample

Method summary:

Method for determination of benzene content in gasoline. The retention time of each component has been determined, and the method has the advantages of simple sample processing, short analysis time, high separation, and good data reproducibility. It is suitable for the determination of benzene content in automotive gasoline and aviation gasoline

Execution standard: SH/T0663 "Determination of Certain Alcohols and Ether Oxygenates in Gasoline"

SH/T0693 "Determination of Aromatic Hydrocarbons in Gasoline"

GB17930-2006 "Gasoline for Vehicles"

The provisions of GB 18351-2004 "Ethanol Gasoline for Vehicles".