Optimization of thermal desorption conditions for volatile organic compounds emitted in municipal solid waste storage under SBSE-TD-GC-MS

摘要

Stir bar sorptive extraction and thermal desorption procedure coupled to capillary gas chromatography-mass spectrometry (SBSE-TD-GC-MS) was evaluated and optimized for analyzing volatile organic compounds emitted by municipal solid waste storage. Desorption analytical conditions have been optimized using a Box-Behnken experimental design. The main compounds identified in the samples were terpenes, saturated fatty acid meat cooking, antioxidant compounds such as butylated hydroxytoluene (BHT), and organophosphate flame retardants from plastics. For the desorption step, the optimum analytical conditions were: desorption temperature 300°C, cryofocusing temperature -20°C, flow of helium 50 ml min~(-1), and desorption time 3 min.