Method for determining content of monomer aromatic hydrocarbons in gasoline through gas chromatography

Abstract

The invention relates to a method for determining the content of monomer aromatic hydrocarbons in gasoline through gas chromatography to mainly solve problems of large method establishing difficulty and large valve switching system dead volume of present chromatographic methods. The method, which allows an analyte which is the gasoline to be analyzed through a flow switching center cutting chromatographic device, concretely comprises the following steps: injecting the gasoline sample from a chromatographic shunting introduction port (3), pre-separating through a chromatographic column (4), cutting benzene, an internal standard substance and toluene to a chromatographic column (6) through a flow switching center cutting system (10), further separating, and detecting through a hydrogen flame ionization detector (5); and detecting other aromatic hydrocarbon components through allowing them to enter a damping column (2) after they are separated by the chromatographic column (4), wherein the chromatographic column (4) is TCEP[1,2,3-tri(2-cyanethoxy)]propane capillary chromatographic column; and the chromatographic column (6) is a nonpolar chromatographic column. The method well solves the problems through above technical scheme, and can be applied to the industrial production about the chromatographic analysis of gasoline samples.

Description

technical field

[0001] The invention relates to a method for determining the content of aromatics in gasoline by gas chromatography. Background technique

[0002] Benzene content and total aromatics in motor gasoline are important quality control indicators, and the content of other aromatic components is also an important parameter affecting the quality and performance of gasoline. Because benzene and aromatics are potentially harmful to the human body and the environment, the national standard stipulates that the benzene content in motor gasoline must not be higher than 2.5% (volume fraction); the total amount of aromatics must not be higher than 40% (volume fraction). The current standard methods for determining the content of aromatics in gasoline include industry standards SH / T 0713-2002 "Determination of Benzene and Toluene in Motor Gasoline and Aviation Gasoline by Gas Chromatography", SH / T 0693-2000 "Determination of Aromatics in Gasoline" Gas Chromatography", SH / T0...

Examples

Embodiment 1

[0021] According to the flow chart of Figure 1, the standard samples I~V containing benzene, toluene, internal standard 2-pentanone, o-xylene and 1,2,4-trimethylbenzene were analyzed. The typical chromatographic analysis conditions are shown in Table 1. The composition of the samples is shown in Table 2. Calibration curves were drawn with standard samples I to V, and the calibration curves were used for quantitative calculation of actual samples. Then, the standard sample II was used as the sample to be tested, and the measurement was repeated 5 times. Quantitative calculations were carried out for benzene, toluene, o-xylene and 1,2,4-trimethylbenzene from the calibration curve, and the precision and accuracy of the method were investigated. Standard sample analysis results are shown in Table 3, and the chromatogram of standard sample I is shown in Table 3. figure 2 .

[0022] Table 1 Typical chromatographic analysis conditions

[0023]

[0024] Table 2 The composition ...

technical field

[0001] The invention relates to a method for determining the content of aromatics in gasoline by gas chromatography. Background technique

[0002] Benzene content and total aromatics in motor gasoline are important quality control indicators, and the content of other aromatic components is also an important parameter affecting the quality and performance of gasoline. Because benzene and aromatics are potentially harmful to the human body and the environment, the national standard stipulates that the benzene content in motor gasoline must not be higher than 2.5% (volume fraction); the total amount of aromatics must not be higher than 40% (volume fraction). The current standard methods for determining the content of aromatics in gasoline include industry standards SH / T 0713-2002 "Determination of Benzene and Toluene in Motor Gasoline and Aviation Gasoline by Gas Chromatography", SH / T 0693-2000 "Determination of Aromatics in Gasoline" Gas Chromatography", SH / T0...

Examples

Embodiment 1

[0021] According to the flow chart of Figure 1, the standard samples I~V containing benzene, toluene, internal standard 2-pentanone, o-xylene and 1,2,4-trimethylbenzene were analyzed. The typical chromatographic analysis conditions are shown in Table 1. The composition of the samples is shown in Table 2. Calibration curves were drawn with standard samples I to V, and the calibration curves were used for quantitative calculation of actual samples. Then, the standard sample II was used as the sample to be tested, and the measurement was repeated 5 times. Quantitative calculations were carried out for benzene, toluene, o-xylene and 1,2,4-trimethylbenzene from the calibration curve, and the precision and accuracy of the method were investigated. Standard sample analysis results are shown in Table 3, and the chromatogram of standard sample I is shown in Table 3. figure 2 .

[0022] Table 1 Typical chromatographic analysis conditions

[0023]

[0024] Table 2 The composition ...

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