Abstract
An automatic thermodenuder system for the measurement of SO/sub 2/ is described. Air is sampled by Cu/CuO coated denuder tubes. When the denuders are heated to 800/sup 0/C, SO/sub 2/ is liberated and detected by a standard monitor. For a sampling time of 30 min the limit of detection is 0.1 and 0.015 ..mu..g/m/sup 3/ SO/sub 2/ for a pulsed-fluorescence and a flame-emission monitor, respectively. For both instruments the response is linear up to 100 ..mu..g/m/sup 3/. Sulfuric acid, sulfate aerosols, and organic sulfur compounds like CS/sub 2/, COS, and dimethyl sulfide do not interfere at concentrations up to 100 ..mu..g/m/sup 3/. Interference of H/sub 2/S can be eliminated by a NaHSO/sub 4//Ag/sub 2/SO/sub 4/ coated predenuder placed in the sample line. The measurement of SO/sub 2/ concentrations at background levels and the determination of dry deposition velocities by measurement of SO/sub 2/ gradients are obvious applications.
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