Within the project „Organic Carbon ORCA“, a portable sensor for DOM fluorescence indices was developed. The paper is online now: „Brandl, M., T. Posnicek, R. Preuer, G. Weigelhofer (2020) A Portable Sensor System for Measurement of Fluorescence Indices of Water Samples. IEEE SENSORS JOURNAL. 10.1109/JSEN.2020.2988588.“