Development of flow injection potentiometric methods for the off-line and on-line determination of fluoride to monitor the biodegradation of a monofluorophenol in two bioreactors

The described flow injection potentiometric methods enabled the fluoride determination within the required quantification range 0.10-100 mM. The possible interferences from the growth medium were minimized in-line. The determination rate was 78 h−1 for the off-line monitoring of RBC and 50−1 h for the on-line monitoring of the SBR, with a sample consumption of 0.500 mL and 0.133 mL per determination, respectively. Furthermore, the overall reagent consumption was quite low. The accuracy of the system was evaluated by comparison with a batch procedure. The SBR efficiency was monitored both on-line by the flow system and off-line by HPLC, for comparison purposes.