Monitoring the herbicide concentration in ponds by detecting the chlorophyll fluorescence of algae with ms-laser excitation

Bernhard Ruth

doi:10.1117/12.221084

21 September 1995 Monitoring the herbicide concentration in ponds by detecting the chlorophyll fluorescence of algae with ms-laser excitation

Bernhard Ruth

Author Affiliations +

Proceedings Volume 2503, Air Toxics and Water Monitoring; (1995) https://doi.org/10.1117/12.221084
Event: European Symposium on Optics for Environmental and Public Safety, 1995, Munich, Germany

Abstract

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 F_a1 and F_a2 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 I_a of the excitation light yields F_o (alpha) I_a 1.02, F_a1 (alpha) I_a 1.91, and F_a2 (alpha) I_a 1.57. The ratio F_a2/F_a1 scales the herbicide action and it can be related to a back reaction between PS-components.

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Bernhard Ruth "Monitoring the herbicide concentration in ponds by detecting the chlorophyll fluorescence of algae with ms-laser excitation", Proc. SPIE 2503, Air Toxics and Water Monitoring, (21 September 1995); https://doi.org/10.1117/12.221084

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