960 
number of excitation and emission wavelengths depends on apparatus possibilities, as well as on 
the main goal of investigator. For rough classification of OP (light/medium/heavy) two excitation 
wavelengths are enough. For more precise oil type identification at least three .Aex are needed. 
5 - CONCLUSIONS 
We can summarize basic spectral features obtained in this work. 
- Location of spectrum maximum and spectral shape for oil dispersed in water strongly 
corresponds with A ex alteration; Amax for oil film is independent of A ex. 
- For natural dissolved organic matter Amax equals 440 nm and practically is constant while Aex is 
varying from 200 to 340 nm, but shifts to longer wavelengths if A ex > 340 nm. 
- Major bands in fluorescence spectra for oil pollutions in water have the following maxima: 
290 nm (Aex<266 nm) - is caused by light OP (gasoline); 
340 nm (Aex<308 nm) - is caused by water soluble OP fractions; 
>400 nm - due to heavy oils. 
-Some additional bands appear in fluorescence spectra using close excitation wavelengths in 
spectral region 300...345 nm. 
-On the basis of experimental results the new technique for separation of fluorescence of oil 
pollution dispersed in water has been suggested. 
-Synchronous fluorescence spectra for different oil pollutions in water have been detected using 
various differenceAA between Aex and Aem. Synchronous fluorescence spectra withAA=50 nm 
characterize type of oil pollution and can be used for oil identification. DOM does not contribute 
in this spectrum. 
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4. Burlamacchi P., Cecchi G., Mazzinghi P., Pantani L., 1983. Performance evaluation of UV 
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