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Optical sensors, namely a submersible UV-visible spectrophotometer, a fluorescence probe for dissolved organic matter and a fluorimeter with a circulation cuvette dedicated to tryptophan-like fluorescence measurement have been deployed for the real-time monitoring of a periurban stream. Biofouling was a main issue for the UV-visible spectrophotometer and the tryptophan-like fluorimeter. However nitrates variation could be monitored by UV-vis spectroscopy based on the maximum of the second derivative of the spectrum in the UV-range.
dissolved organic matter, fluorescence, nitrates, UV-visible absorbance.
Les auteurs remercient l’ANR pour son aide financière dans le cadre du projet EPEC.
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