title: Determination of passive-sampled sulphur dioxide in ambient air as sulphate ion by flow injection analysis with an in-line reaction column.
abstract: 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 increase the sensitivity and reproducibility. An in-line cation exchange column was used to eliminate triethanolamine, which was used as the absorbent reagent in the passive sampler. Sulphate ions can be analyzed in the range of 0.08-10.00 mg l(-1) with the R.S.D. less than 1.6% at the rate of 15 samples h(-1). It was satisfactory to apply this method to the analysis of sulphur dioxide in ambient air and the results agreed with those obtained by ion chromatography.
authors.affiliation: Faculty of Integrated Arts and Sciences, University of Tokushima, Tokushima 770, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Yang
authors.forename: X X
authors.initials: XX
authors.lastname: Zhang
authors.forename: T
authors.initials: T
authors.lastname: Korenaga
authors.forename: K
authors.initials: K
authors.lastname: Higuchi