Abstract

Abstract A compact, fast-response instrument for measuring atmospheric NO 2 by single-wavelength excitation laser-induced fluorescence (LIF) technique was improved. A single-pass alignment of a more powerful, pulsed laser was utilized to realize the pptv (=10 −12 by volume) of the limit of detection (LOD). As a result, the LOD reached 1.8 pptv for 1-min averaging ( S / N =1). To determine the instrumental zero accurately, interference by particles was cancelled out utilizing an NO 2 scrubber tube coated with a mixture of titanium dioxide (TiO 2 ) and hydroxyapatite. Consequently, it was confirmed that the combination of the improved single-wavelength LIF instrument with the scrubber was reasonable for measuring atmospheric NO 2 .

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