Automatic colorimetric detector for traces of nitrogen dioxide in air

A reliable and easy‐to‐operate detector has been developed for determining low concentrations of nitrogen dioxide in air. In the detector, the air sample is bubbled through a volume of 40 cm3 of Saltzman reagent, and the transmittance of light (550 nm) by the reagent is continuously measured by a bu...

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Bibliographic Details
Published in:Review of scientific instruments 1988-01, Vol.59 (1), p.163-166
Main Author: Punkkinen, R. K.
Format: Article
Language:English
Subjects:
Chemical composition and interactions. Ionic interactions and processes
Earth, ocean, space
Exact sciences and technology
External geophysics
Meteorology
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Summary:A reliable and easy‐to‐operate detector has been developed for determining low concentrations of nitrogen dioxide in air. In the detector, the air sample is bubbled through a volume of 40 cm3 of Saltzman reagent, and the transmittance of light (550 nm) by the reagent is continuously measured by a built‐in photometer. The output of the detector is a dc voltage proportional to the transmittance. The reagent is replaced every 12 h. The detection limit is about 1×10− 1 0 by volume for 1‐h measuring periods. After abrupt changes in the NO2 level, the rise and fall times of the readings (from 10% to 90% of the change) are about 5 min. A microcomputer can be used to control the system and to determine the nitrogen‐dioxide concentrations automatically.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.1139994