The efficiency of trapping of SO2 with different air flow rate and also for absorption vessels with different internal dimension (impinger gaps) has been studied. Problems encountered in trapping samples of reactive gases (SO2 in this case), in atmosphere were also examined. The amount of SO2 obtained gravimetrically was 0.0002751g/min and the amount of SO2 obtained using absorption solution at different flow rate was 0.0002509g/min, while the amount of SO2 obtained using absorption solution with different impinger gaps was 0.0002532g/min. Therefore, the amount of SO2 collected using absorption solution is almost the same with the amount expected from the known rate of loss of the permeation tube determined gravimetrically, it is just more concentrated in the air with about 0.0000242g/min.
