The LFGGC-2013 air volatile organic compound component analysis system is based on gas chromatography detection technology and uses thermal desorption tube enrichment sampling. At room temperature, volatile organic compounds ranging from C2 to C12 can be enriched. It is specifically designed for the analysis of 57 types of ozone precursors (PAMS), providing basic data for atmospheric pollution prevention and control such as ozone traceability and VOCs pollution level characterization.

Method principle:

Control the start of the vacuum pump to start sampling, and the sampling time can be set according to the actual situation. MFC controls the sampling volume flow rate, and the sample enters the enrichment tube at a constant flow rate. Volatile organic compounds are adsorbed by the enrichment tube. After enrichment is completed, switch the diaphragm valve and start the program temperature rise. The sample is brought to the chromatographic column through the carrier gas. The chromatographic column is divided into C2-C6 dedicated column and C6-C12 dedicated column. At the same time, the chromatographic column starts the program temperature rise. Volatile organic compounds are separated in the chromatographic column and finally detected by the detector. Qualitative analysis was conducted by retaining time, and quantitative analysis was performed by peak area to complete the analysis of 57 types of C2-C12 ozone precursors (PAMS).

Technical features:

Fully automatic sampling, room temperature enrichment, high temperature analysis, and rapid analysis;

Real time monitoring, display, and storage of instrument status information; Detailed and complete process log records;

MFC controls the sampling flow rate, and the enrichment time and sampling volume can be flexibly set;

Adopting enrichment sampling to achieve a detection limit of ppb level, and designing a backflush to ensure the accuracy and consistency of each injection;

The same instrument is used to analyze low boiling point (C2-C6), organic compounds, and high boiling point (C6-C12) organic compounds by replacing different capillary columns and setting different enrichment and analysis temperatures;

Adopting imported special stainless steel capillary columns with a heating rate of 20 ℃/min;

Adopting imported high-efficiency, high-precision, and high stability hydrogen flame ionization detector (FID);

The key point of automatic shutdown is to turn off the hydrogen valve to ensure safe operation, collect combustion exhaust gas, prevent internal corrosion of the instrument and secondary pollution of indoor air.