SEDL / STP / STP555-EB / STP38965S

Instrumentation for the Measurement of Nitrogen Dioxide

Stevens, RK
Chiefchiefresearch chemist, National Environmental Research Center, Research Triangle Park, N. C.

Clarke, T
Chiefchiefresearch chemist, National Environmental Research Center, Research Triangle Park, N. C.

Baumgardner, R
Chiefchiefresearch chemist, National Environmental Research Center, Research Triangle Park, N. C.

Hodgeson, JA
Chief, National Environmental Research Center, Las Vegas, Nev.

Pages: 8    Published: Jan 1974

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Abstract

A comparative discussion is given on the operational and response characteristics of colorimetric, chemiluminescent, and electrochemical monitors for ambient nitrogen dioxide (NO²). Recent studies have demonstrated that ozone (O³) is a significant negative interference with the automated colorimetric technique, and details of these studies are given. The latest technology for the conversion of NO² to nitric oxide (NO) for subsequent chemiluminescent detection is discussed. The mechanism of operation and the chemistry involved with newly developed electrochemical monitors for NO²are described.