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 language | English |
|---|---|
| Pages (from-to) | 1278-1281 |
| Number of pages | 4 |
| Journal | Analytical Chemistry |
| Volume | 63 |
| Issue number | 13 |
| State | Published - Jul 1 1991 |
| Externally published | Yes |
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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 journal › Article
}
TY - JOUR
T1 - Nitrogen oxide gas sensor based on a nitrite-selective electrode
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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M3 - Article
AN - SCOPUS:0001419226
VL - 63
SP - 1278
EP - 1281
JO - Analytical Chemistry
JF - Analytical Chemistry
SN - 0003-2700
IS - 13
ER -