Development of a cobinamide-based end-of-service-life indicator for detection of hydrogen cyanide gas

作者：Greenawald Lee A^*; Snyder Jay L; Fry Nicole L; Sailor Michael J; Boss Gerry R; Finklea Harry O; Bell Suzanne

来源：Sensors and Actuators B: Chemical , 2015, 221: 379-385.

DOI：10.1016/j.snb.2015.06.085

• Paper sensor
• Optical sensor
• Hydrogen cyanide
• Cobinamide
• Diffuse reflectance
• End-of-service-life indicator

We describe an inexpensive paper-based sensor for rapid detection of low concentrations (ppm) of hydrogen cyanide gas. A piece of filter paper pre-spotted with a dilute monocyanocobinamide [CN(H2O)Cbi] solution was placed on the end of a bifurcated optical fiber and the reflectance spectrum of the CN(H2O)Cbi was monitored during exposure to 1.0-10.0 ppm hydrogen cyanide gas. Formation of dicyanocobinamide yielded a peak at 583 nm with a simultaneous decrease in reflectance from 450-500 nm. Spectral changes were monitored as a function of time at several relative humidity values: 25,50, and 85% relative humidity. With either cellulose or glass fiber papers, spectral changes occurred within 10 s of exposure to 5.0 ppm hydrogen cyanide gas (NIOSH recommended short-term exposure limit). We conclude that this sensor could provide a real-time end-of-service-life alert to a respirator user. Published by Elsevier B.V.

• 出版日期2015-12-31