A portable absorption-fluorometer for detection of organic substances in fluids.
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.
Mittenzwey
K H
KH
Gesellschaft für Mess- und Systemtechnik mbH, Rudower Chaussee 5, D-12489, Berlin, Germany.
Sinn
G
G
Hiersigk
R
R
Krause
M
M
Lenz
P
P
Pfeil
L
L
Rauchfuss
J
J
Streich
G
G