Nitrogen Oxide Gas Sensor Based on a Nitrite-Selective Electrode

Stacy A. O’Reilly; Sylvia Daunert; Leonidas G. Bachas

doi:10.1021/ac00013a018

Nitrogen Oxide Gas Sensor Based on a Nitrite-Selective Electrode

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

Research output: Contribution to journal › Article › peer-review

36 Scopus citations

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 NO_x gas sensor was prepared by placing this electrode behind a microporous gas-permeable membrane. NO_x 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 NO_x 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 NO_x sensor does not suffer from such interferences and exhibits better detection limits.

Original language	English (US)
Pages (from-to)	1278-1281
Number of pages	4
Journal	Analytical Chemistry
Volume	63
Issue number	13
DOIs	https://doi.org/10.1021/ac00013a018
State	Published - Jul 1 1991
Externally published	Yes

ASJC Scopus subject areas

Analytical Chemistry

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10.1021/ac00013a018

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title = "Nitrogen Oxide Gas Sensor Based on a Nitrite-Selective Electrode",

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.",

author = "O{\textquoteright}Reilly, {Stacy A.} and Sylvia Daunert and Bachas, {Leonidas G.}",

year = "1991",

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AU - O’Reilly, Stacy A.

AU - Daunert, Sylvia

AU - Bachas, Leonidas G.

PY - 1991/7/1

Y1 - 1991/7/1

N2 - 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.

AB - 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.

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