Repetitive determinations of sulfur dioxide gas in air samples by flow injection and chemical reaction at a gas-liquid interface

Repetitive processing of air samples for SO/sub 2/(g) determination in a continuous-flow system is presented. Determination is based on the reaction of SO/sub 2/ with di-..mu..-hydroxo-bis(bis(1,10-phen anthroline)iron(III)), the dimer of ferriin, at a gas-liquid interface. The performance of an open tube coll reactor, a single-bead string reactor, and a midget impinger setup is discussed and compared. The proposed methodology allows determination of SO/sub 2/ in the 0.5 to 15.0 ppM (v/v) range with relative standard deviations of 2 to 4% (for 10 repetitive determinations). The main reagent was electrochemically regenerated by controlled potential electrolysis allowing the use of a closed-loop system. The number of determinations per hour are 20 with the midget impinger, 40 with the open tube coll reactor, and 50 with the single-bead string reactor.

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