基于空气动力学透镜的在线热解吸进样系统的研制与初步测试OA

This study developed an online aerosol thermodesorption sampling system based on an aerodynamic lens.The system primarily consists of a gas-phase denuder,a high-throughput wide-range lens,and a thermodesorption module.The lens sampling system,optimized through fluid sim-ulation,achieves high-flow sampling at 575 mL/min and a wide particle transmission range of 0.1-13.0 μm.Experimental results demonstrate that the gas-phase denuder achieves 99.74％adsorption efficiency for volatile gases and maintains particle transmission efficiency ranging from 93.56％to 99.70％for particles within the 100-500 nm size range,effectively eliminating VOCs interference in organic aerosol samples while minimizing particle transmission losses.The lens thermodesorption sampling system was coupled with a single photon ionization time of flight mass spectrometer(SPI-MS)to conduct online detection and analysis of smoke particles from different biomass combustion sources,including cigarettes,moxa sticks,and mosquito coils.This work demonstrates the appli-cation capability of this combined system for detecting particle-phase VOCs of biomass combustion products.The aerosol sampling system can be used for a variety of traditional vacuum-ionization mass spectrometers,and has a broad application prospect.