Advanced Respirometry with Chemical Optical Sensor Spots Non-invasive Tracking of Oxygen, Carbon Dioxide and pH as Indicator for Nitrification Activity Eva M. Gilbert, Susanne Lackner Karlsruhe Institute of Technology (KIT), Engler-Bunte Institute, Water Chemistry and Water Technology, Karlsruhe, Germany Respirometry is an indirect way of measuring microbial activity, such as nitrification. The oxygen uptake is proportional to the su

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