Chemiluminescent method for continuous monitoring of nitrous acid in ambient air

A continuous-flow method for measuring atmospheric HNO2 concentration in real time has been developed that uses a chemiluminescent NOx monitor. A Na2CO3 solution strips gaseous HNO2 from the atmosphere by means of pulling an air sample and the solution through a glass coil and mixing continuously wi...

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Bibliographic Details
Published inAnalytical chemistry (Washington) Vol. 62; no. 19; pp. 2084 - 2087
Main Authors Kanda, Yukio, Taira, Masafumi
Format Journal Article
LanguageEnglish
Published Washington, DC American Chemical Society 01.10.1990
Subjects
01 COAL, LIGNITE, AND PEAT
010900 - Coal, Lignite, & Peat- Environmental Aspects
540120 - Environment, Atmospheric- Chemicals Monitoring & Transport- (1990-)
Air - analysis
AIR SAMPLERS
Analysis methods
Applied sciences
ATMOSPHERIC CHEMISTRY
Atmospheric pollution
Calibration
CHEMICAL ANALYSIS
CHEMILUMINESCENCE
CHEMISTRY
DATA
DETECTION
ENVIRONMENTAL SCIENCES
Exact sciences and technology
EXPERIMENTAL DATA
HYDROGEN COMPOUNDS
INFORMATION
INORGANIC ACIDS
LUMINESCENCE
Luminescent Measurements
NITROUS ACID
Nitrous Acid - analysis
NUMERICAL DATA
Oxidation-Reduction
Pollution
SAMPLERS
Ambient air concentration
Check
Chemiluminescence
Air
Measurement method
Continuous flow method
Nitric acid
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Summary:A continuous-flow method for measuring atmospheric HNO2 concentration in real time has been developed that uses a chemiluminescent NOx monitor. A Na2CO3 solution strips gaseous HNO2 from the atmosphere by means of pulling an air sample and the solution through a glass coil and mixing continuously with ascorbic acid solution which reduces nitrite to NO. The mixture is led into a gas-liquid separating coil consisting of microporous PTFE tubing. The NO evolved from the separating coil is swept out by a stream of clean air and detected with a chemiluminescent NOx monitor. The technique utilizes a dual flow system and dual channel NOx monitor to correct positive interferences from NO2 and peroxyacetyinitrate (PAN). The concentration of HNO2 is determined by difference between the two measurements. Sensitivity of the method is a function of the ratio of sampling flow rate to carrier gas flow rate, which permits readily a highly sensitive measurement.
Bibliography:istex:1CC8EE1715DB927328EEE7F99F75F46FC356B606
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ISSN:0003-2700
1520-6882
DOI:10.1021/ac00218a007