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Use of a surface-acoustic-wave sensor to characterize the reaction of styrene vapor with a square-planar organoplatinum complex.

Authors
Zellers-ET; White-RM; Rappaport-SM
Source
Anal Chem 1990 Jul; 62(13):1222-1227
NIOSHTIC No.
00195505
Abstract
The reaction of styrene (100425) vapor with the square planar platinum-ethylene pi complex, trans-PtCl2(ethylene)pyridine was characterized using a coated surface acoustic wave (SAW) sensor. A dual SAW delay line oscillator configuration was used; one oscillator was coated with a solvent cast film of the solid platinum- ethylene complex dispersed in a poly(isobutylene) matrix, and the second oscillator was coated only with polymer. Absorbed styrene vapor displaced ethylene to form the stable styrene substituted complex trans-PtCl2(styrene)(pyridine), causing a decrease in the oscillator frequency from the increase of mass on the surface of the sensor. For short term exposure, there was a linear relationship between the logarithm of the rate of frequency change and the logarithm of the styrene vapor concentration consistent with a power law kinetic model for the heterogeneous trapping reaction. Deviation from the relationship above 300 parts per million (ppm) at 25 degrees-C was attributed to the onset of multilayer adsorption of styrene at the surface of the trapping reagent. The sensor response exhibited an Arrhenius temperature dependence permitting estimation of the thermal activation energy for the olefin substitution reaction. Calculated detection limits of three and 0.6ppm of styrene vapor were achieved for operation at 25 and 40 degrees-C, respectively. The authors conclude that the coated SAW sensor can serve as a useful probe of vapor solid reactions. The strong temperature dependence observed underscores the need for careful thermostating of the sensor during operation.
Keywords
NIOSH-Publication; NIOSH-Grant; Analytical-chemistry; Chemical-analysis; Analytical-methods; Vapor-detectors; Organic-vapors; Physical-chemistry; Monitoring-systems; Chemical-kinetics; Analytical-instruments; Air-monitoring
Contact
Environmental & Indust Health University of Michigan Dept of Environmental Hlth Ann Arbor, MI 48109-2029
CODEN
ANCHAM
CAS No.
100-42-5
Publication Date
19900701
Document Type
Journal Article
Funding Amount
269506.00
Funding Type
Grant
Fiscal Year
1990
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-02663
Issue of Publication
13
Source Name
Analytical Chemistry
State
MI
Performing Organization
University of Michigan at Ann Arbor, Ann Arbor, Michigan
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