title: A portable absorption-fluorometer for detection of organic substances in fluids.
abstract: Using the method of multipath-saturation fluorescence, which considers both fluorescent as well as nonfluorescent substances, the total absorption coefficient can be determined with high sensitivity. This new fluorescence method is appropriate, e.g. for in-situ applications. Thus a portable absorption-fluorometer has been constructed. The main part of the device is a multireflection cell based on a design of Herriott with a 1 cm quartz-cuvette. Two pairs of spherical dielectric mirrors are used to realize the multireflection of the excitation radiation in the UV and blue spectral range. The combination of a cylindrical and a convace mirror leads to a long pathway of the excitation radiation and, thus, to a full absorption by the fluid. A first experiment has been performed with drinking water samples defined polluted by non-fluorescent p-nitrophenol and 2-nitroaniline. Based on the method of multipath-saturation fluorescence a good correlation to the substance concentration was achieved, whereas the conventional absorption failed.
authors.affiliation: Gesellschaft für Mess- und Systemtechnik mbH, Rudower Chaussee 5, D-12489, Berlin, Germany.
authors.forename: K H
authors.initials: KH
authors.lastname: Mittenzwey
authors.forename: G
authors.initials: G
authors.lastname: Sinn
authors.forename: R
authors.initials: R
authors.lastname: Hiersigk
authors.forename: M
authors.initials: M
authors.lastname: Krause
authors.forename: P
authors.initials: P
authors.lastname: Lenz
authors.forename: L
authors.initials: L
authors.lastname: Pfeil
authors.forename: J
authors.initials: J
authors.lastname: Rauchfuss
authors.forename: G
authors.initials: G
authors.lastname: Streich