Prototype instrument employing an integrated array of polymer-coated flexural-plate-wave (FPW) vapor sensors.
Cai-QY; Heldsinger-D; Hsieh-MD; Park-J; Zellers-ET
Proceedings of the 196th Meeting of the Electrochemical Society, October 17-22, 1999, Honolulu, Hawaii. Pennington, NJ: The Electrochemical Society, 1999 Oct; :216-223
Preliminary testing of a prototype instrument employing an integrated array of six polymer-coated flexural plate wave (FPW) sensors and an adsorbent preconcentrator is described. Measurements of eight vapors individually and in selected binary and ternary mixtures were collected. Responses were linear with concentration and mixture responses were equivalent to the sums of the component vapor responses. Limits of detection as low as 0.3 ppm were achieved from a 60-sec (200 cm3) air sample. Increases in sampling flow rates (volumes) led to commensurate increases in responses. However, for a given sample volume, increases in the desorption flow rate led to decreases in response maxima indicating that sorption kinetics limit responses at higher flow rates. Modeling of array performance using Monte Carlo simulations indicate that all individual vapors and certain 2 degrees and 3 degrees mixtures could be recognized/discriminated with very low error. More complex mixtures, and those containing homologous vapors, were problematic.
Vapors; Toxins; Toxic-vapors; Toxic-effects; Occupational-exposure; Emergency-response; Emergency-responders; Protective-clothing; Organic-compounds; Exposure-levels; Exposure-assessment; Air-quality; Air-quality-control; Air-quality-monitoring; Organic-vapors
Proceedings of the 196th Meeting of the Electrochemical Society, October 17-22, 1999, Honolulu, Hawaii
University of Michigan, Ann Arbor