Nitrogen oxide gas sensor based on a nitrite-selective electrode

Stacy A. O'Reilly, Sylvia Daunert, Leonidas G Bachas

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

Incorporation of dicyanocobalt(III) a,b,c,d,e,f,g-heptapropylcobyrinete in plasticized poly(vinyl chloride) membranes has resulted in the development of electrodes that are selective for nitrite. An NOx gas sensor was prepared by placing this electrode behind a microporous gas-permeable membrane. NOx is generated in the sample at pH 1.7 and, after crossing the gas-permeable membrane, is trapped as nitrite by an internal solution buffered at pH ≥ 5.5. This sensor is different from the conventional Severlnghaus-type sensor, which employs a flat-bottom pH electrode. The latter senses changes in the pH of an internal unbuffered solution as NOx diffuses across the gas-permeable membrane. The Severinghaus-type sensor exhibits severe interferences from weak lipophilic acids that can cross the gas-permeable membrane and affect the pH of the internal solution. The described NOx sensor does not suffer from such interferences and exhibits better detection limits.

Original languageEnglish
Pages (from-to)1278-1281
Number of pages4
JournalAnalytical Chemistry
Volume63
Issue number13
StatePublished - Jul 1 1991
Externally publishedYes

Fingerprint

Gas permeable membranes
Nitrites
Chemical sensors
Nitric Oxide
Electrodes
Sensors
Vinyl Chloride
Membranes
Acids

ASJC Scopus subject areas

  • Analytical Chemistry

Cite this

Nitrogen oxide gas sensor based on a nitrite-selective electrode. / O'Reilly, Stacy A.; Daunert, Sylvia; Bachas, Leonidas G.

In: Analytical Chemistry, Vol. 63, No. 13, 01.07.1991, p. 1278-1281.

Research output: Contribution to journalArticle

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