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Original Articles

A Rapid and Sensitive Colorimetric Reagent for Nitrogen Dioxide in Air

Pages 481-484 | Published online: 16 Mar 2012
 

Abstract

High speed instrumentation requires a colorimetric reagent capable of detecting traces of nitrogen dioxide with little delay for color development. Rate of color development and sensitivity of Griess-type reagent have been improved by adding a promoter (R-salt) and optimizing the concentrations of diazotizing and coupling reagents. Field tests show that the new instrument-reagent combination can resolve short-duration peaks in NO2 concentrations of 5 to 10 pphm.

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