An annular denuder system(ADS), which consisted of denuder tubes striping the reactive gases from air and leaving the particles on the filters was designed.

• 应用环形扩散管同时采集和分离空气中气态组分和气溶胶颗粒两种状态的污染物，解决了采集过程中气体和颗粒物相互干扰问题。