ANALYSIS OF DISSOLVED HUMIC SUBSTANCES IN EUTROPHIC WATERS USING THE FLUORESCENCE OF NATURAL SAMPLES - CALCULATIONS AND EXPERIMENTS

Theoretical analyses and experiments have been performed for rapid det ection of dissolved humic substances in surface waters. The fluorescen ce has been generated by a nitrogen laser in a laboratory An optical m odel has been developed, which has been applied to eutrophic waters ar ound Berlin. The model is based on the assumption, that humic substanc es and phytoplankton dominate the fluoresence behaviour of the investi gated waters. To verify the results of the model, regression analyses between fluorescence data of natural samples and the chemical oxygen d emand of filtrates have been conducted. When green and red fluorescenc e values and the green fluorescence decay time were considered, a maxi mum squared correlation coefficient of typically 0.85 occured.