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Steric factors affecting the discrimination of isomeric and structurally related olefin gases and vapors with a reagent-coated surface acoustic wave sensor.

Authors
Zellers-ET; Zhang-Z
Source
Anal Chem 1992 Jun; 64(11):1277-1284
NIOSHTIC No.
00207905
Abstract
The extent to which steric factors could be exploited to obtain selectivity for unhindered olefins in the presence of hindered olefins with these reagents coated on a surface acoustic wave (SAW) sensor was determined. Detection was based on the mass increase accompanying replacement of ethylene by other gas phase olefins to form the corresponding olefin substituted products. Selectivity depended on the relative reaction rates of the different olefins. Unusually high selectivity was observed for the less hindered olefins and complete discrimination of isomers was achieved in certain cases. The sensor response was progressively reduced by replacing pyridine by 2-methylpyridine and 2,6-dimethylpyridine in the reagent complex. With increasing temperature the sensitivities increased. The limits of detection ranged from 2 to 70 micrograms/liter and were achieved with modest heating of 30 to 40 degrees-C using a 30 megahertz SAW oscillator. Initial results with a 52 megahertz sensor showed a 3.4 fold increase in sensitivity compared to the 30 megahertz sensor, in rough agreement with theory.
Keywords
NIOSH-Publication; NIOSH-Grant; Grants-other; Analytical-methods; Chemical-analysis; Analytical-chemistry; Temperature-effects; Air-quality-monitoring
Contact
Environmental & Indust Health University of Michigan Dept of Environmental Hlth Ann Arbor, MI 48109-2029
CODEN
ANCHAM
Publication Date
19920601
Document Type
Journal Article
Funding Amount
269506.00
Funding Type
Grant
Fiscal Year
1992
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-02663
Issue of Publication
11
Priority Area
Other Occupational Concerns; Grants-other
Source Name
Analytical Chemistry
State
MI
Performing Organization
University of Michigan at Ann Arbor, Ann Arbor, Michigan
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