TIME-RESOLVED FLUORESCENCE MEASUREMENTS OF AQUATIC NATURAL ORGANIC-MATTER (NOM)

The fluorescence decay of aquatic natural organic matter (NOM) samples was investigated using the time-correlated single photon counting tec hnique (TCSPC). Two different approaches for the data analysis are pre sented: the discrete component approach (DCA) and the exponential seri es method (ESM). The parameter set obtained in the DCA is discussed in terms of characterization for NOM of different origins. However, the obtained parameter set can only be interpreted as operationally define d. Using the ESM for a fluorescence decay time distribution analysis n o a priori assumption about the number of fluorescing components was i ntroduced into the data analysis. The interpretation of fluorescence d ecay time data for samples before and after ozonation is in good agree ment with results of other analytical methods.