抄録
Ambient air samples were collected in Southeast Asian cities (Beijing, Bangkok, Kuala Lumper and Jakarta etc.) by passive samplers. Sulfur dioxide (SO2) was analyzed as sulfate ion in solution by FIA with a BaSO4-immobilized on-line reaction column. The method was based on the reaction of sulfate ion with barium-dimethylsulfonazo-III complex. The results agreed with those obtained by ion chromatography. The results showed that the SO2 concentrations in theses cities were in the range of 24-140ppb.