二氧化硫是大气污染监测的主要指标之一。在研制大气中二氧化硫测定方法和分析仪器时,往往需要制备恒定的低浓度二氧化硫标准气体。由于二氧化硫的化学性质比较活泼,用静态配气法难以做到稳定、可靠。渗透管法是近年来发展起来的一种制备恒定的低浓度混合气体的方法,经校准的渗透管当作一种标准气源来使用。我们在研制大气二氧化硫测定仪 Sulfur dioxide is one of the main indicators of air pollution monitoring. In the development of atmospheric sulfur dioxide determination methods and analytical instruments, often need to prepare a constant low concentration of sulfur dioxide standard gas. As the chemical properties of sulfur dioxide more lively, with the static gas distribution is difficult to achieve stable and reliable. Permeation tube method is developed in recent years, a constant concentration of low-concentration gas mixture, the calibrated permeate tube as a standard gas source to use. We are developing atmospheric sulfur dioxide detector