Proceedings PaperMonitoring the herbicide concentration in ponds by detecting the chlorophyll fluorescence of algae with ms-laser excitation
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Algae grown under natural conditions in a pond are compared to cultivated algae (Microcystis). The initial phase of the induction kinetics until 50 ms can be described by two exponential functions with amplitudes Fa1 and Fa2 and time constants in the order to 1 ms and 10 ms. With the restriction of the observation time to 50 ms, the usual darkadaptation time can be considerably reduced. A variation of the power density Ia of the excitation light yields Fo (alpha) Ia 1.02, Fa1 (alpha) Ia 1.91, and Fa2 (alpha) Ia 1.57. The ratio Fa2/Fa1 scales the herbicide action and it can be related to a back reaction between PS-components.