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A modified FIA method was developed for the determination of sulphur dioxide (SO 2 ) in ambient air collected by a passive sampler. SO 2 was oxidized by hydrogen peroxide and determined as sulphate ion in solution. Barium-dimethylsulfoazo-III complex was used as spectrophotometric reagent. A BaSO 4 -immobilized in-line reaction column was introduced into the flow system to...
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