Carboxen carbon molecular sieve (CMS) material has a through-hole structure. Most of the pores penetrate the particles. In addition, the specially designed pores gradually become smaller from large to medium and then to micropores, making the material have outstanding thermodynamic properties for both adsorption and desorption processes. Therefore, other carbon molecular sieve materials on the market cannot match the performance of our Carboxen material. When weakly adsorbed adsorbents are used for appropriate protection upstream, Boxen materials exhibit excellent performance for numerous C2-C5 short chain analytes.

Summary:Objective: To establish a thermal desorption gas chromatography method for the determination of vinyl chloride in workplace, ambient air, and exhaust gas. Method: Carboxen1000 adsorption tube was used to adsorb vinyl chloride and dichloroethane in the workplace and ambient air for qualitative and quantitative analysis by thermal desorption gas chromatography. Result: The correlation coefficient of the standard curve reached 0.9998, the detection limit was 30 ng/sample, the low detection concentration was 0.02 mg/m3 (based on collecting 1.5 L of air), the desorption efficiency was 91.3%~94.5%, and the precision was 0.6%~4.2%. After purification of the adsorption tube and sample collection, it was sealed with brass nuts and stored in a sealed plastic bag at room temperature for one week. Conclusion: This method can be used for detecting the concentration of vinyl chloride in workplaces, ambient air, exhaust gases, and indoor air.