The Research on SO2 Stability in Gas Absorption Cell

The SO2absorption spectrum is recorded using Xe lamp source under atmospheric conditions at ambient temperatures. The SO2concentration is retrieved to study the relation between SO2concentration and time. In this experiment, effects of temperature and the buffer gas N2are also considered. It is demonstrated that the concentration of SO2decreases in a linear relation to the time and the period of illumination may have effects on the rate of decrease. These results are applicable to SO2pollution monitoring in the atmosphere using high resolution spectrometer and differential absorption lidar.