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A selective ozone scrubber for application in ambient nitrogen dioxide measurements using the commercial LuminoxR (LMA-3, Scintrex/Unisearch Inc.)



Atmospheric environment 29 (1995), No.8, pp.947-950 : Ill., Lit.
ISSN: 0004-6981
ISSN: 1352-2310
Journal Article
Fraunhofer IFU; 2002 in Helmholtz-Gesellschaft integriert
air pollution; chemiluminescence; Luminol; measurement technique; nitrogen dioxide; ozone scrubber

A new selective O3 scrubber is described, which effectively removes the complex nonlinear O3 interference with NO2 measurements made using the commercial LuminoxR detector (LMA-3, Scintrex/Unisearch Inc.). The scrubber, which consists of a small annular denuder coated with natural rubber (1,4-polyisoprene), was optimized for airborne NO2 measurements of 3 to 4 h duration. Ozone is reduced below 1-2 ppb for doses for at least 600 ppbh (ppb:parts per billion (10 (exp -9)) per volume), while NO2 losses are negligible after preconditioning the scrubber with about 20 ppb h NO2. Simultaneous airborne NO2 measurements in 1992 with two identical LuminoxR instruments showed that the scrubber efficiently removes the systematic overestimation of low tropospheric NO2 mixing ratios by unprotected LuminoxR detectors.