An Optical Dosimeter for the Selective Detection of Gaseous Phosgene with Ultralow Detection Limit.

We present here a cheap, fast, and highly selective dosimeter for the colorimetric detection of gaseous phosgene with an ultralow detection limit. The disposable device is based on Harrison's reagent supported into a porous nanocrystalline TiO matrix film. We exposed the films to phosgene streams while the absorbance was monitored by an optic fiber in a gas chamber.