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Updated: Jun 28, 2026

Automated, High-resolution Mobile Collection System for the Nitrogen Isotopic Analysis of NOx
Published on: December 20, 2016
The application of the chromatomembrane cell for the absorptive sampling of nitrogen dioxide followed by continuous
Yanlin Wei1, Mitsuko Oshima, Jürgen Simon
1Department of Chemistry, Faculty of Science, Okayama University, Tsushimanaka, Okayama-shi 700-8530, Japan.
Abstract:
A simple and rapid procedure for NO(2) determination in air was developed by coupling the chromatomembrane method with a micro-FIA system. A three-hole chromatomembrane cell was successfully applied to on-line preconcentration of atmospheric NO(2) in a solution of 2 g l(-1) triethanolamine (TEA) as an aqueous absorbing solution. The lowest volume of an air sample necessary for the measurement was 5, and 0.02 ml portions of the solution containing the absorbed NO(2) (NO(2)(-) and NO(3)(-)) were supplied to a micro-FIA system being the succeeding component of the proposed analyzer. The amounts of NO(2)(-) in the absorbing solution were measured by a diazotization-coupling reaction with sulfanilamide and N-(1-naphthyl) ethylenediamine, and referred to the concentration of NO(2) in the air sample. The NO(2) content of indoor air was determined to be 43+/-1 ppb using 20 ml of air, and the R.S.D. was +/-1.89%.
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