Department Surface Waters - Research and Management

Alkalinity titration in sediment porewater

While the determination of major ions and nutrients in small volumes of sediment porewater can be accomplished with capillary electrophoresis, alkalinity cannot be analyzed due to the large sample volume required to perform acid-base titration. Yet, alkalinity is an important indicator for key redox processes occurring in the sediment during early diagenesis.
We are developing a coulometric micro-titrator that requires 50 µl volume for a titration. The instrument runs from a laptops’ BNC connection and is based on an Arduino micro-controller platform.


Steinsberger, T.; Kathriner, P.; Meier, P.; Mistretta, A.; Hauser, P. C.; Müller, B. (2018) A portable low cost coulometric micro-titrator for the determination of alkalinity in lake and sediment porewaters, Sensors and Actuators B: Chemical, 255, 3558-3563, doi:10.1016/j.snb.2017.09.191, Institutional Repository