Abstract: The invention is directed to a detecting device for detecting gaseous substances and aerosols with the aid of an enzymatic reaction. This reaction takes place between a reactant and an enzyme which, on the one hand, is exposed to the substance to be detected and, on the other hand, is held by a carrier which in the form of a porous holder is in contact with a solution activating and maintaining the enzymatic reaction. The properties of the solution are changed by the enzymatic reaction and are evaluated. The detection device is so improved that a capability for evaluation is made possible which is quantitative and which is specific for a particular substance to be detected. The substance to be detected as a reactant can be stoichiometrically transferrable into a reaction product for quantitatively determining the substance to be detected by means of an enzymatic reaction.

Abstract: A detecting device in the form of a testing tube or dosimeter having a carrier indicating a color reaction requires a reagent liquid for carrying out a measurement. The reagent liquid is contained in a separate reagent supply vessel and the carrier is impregnated with a color indicator. For carrying out a measurement, the reagent supply from the supply vessel must be brought into contact with the porous carrier. A uniform wetting of the surface of the carrier subjected to the reagent solution is achieved after the reagent solution is emptied from the supply vessel. This is achieved by providing a reagent collection chamber between the carrier and the reagent supply vessel into which the reagent solution pours when the supply vessel is opened and wherein the reagent solution is accommodated and into which the carrier extends so that its end face is subjected to the reagent solution so that this end face can be wetted at the same time.

Abstract: A detector for enzymatically determining components in gases and aerosols and includes a porous filter disposed in a housing. The filler absorbs the aqueous reagent solution, the substrates and the enzymes and is brought into communication with a sample to be investigated. The detector of the invention is improved in that a separate preparation of the components needed for the detection takes place in the housing itself. The components combine without additional ancillary equipment or manual movements. The components are combined in that a porous filler is accommodated in a holder and is tightly held thereagainst and a filler tip projects outwardly therefrom. The filler tip is dipped in a supply vessel containing the reagent solution. A penetratable cover membrane which is impermeable to water is arranged between the filler tip and the supply vessel.