Alkalinity sensor

The NOC has developed a miniaturised total alkalinity sensor using microfluidic lab-on-chip (LOC) technology.

This sensor allows the collection of in situ data with high spatial-temporal resolution throughout the water column (sample time ~10 minutes). The technology uses an open cell approach with spectrophotometric pH determination.

It has an adjustable range, defaulting to 2000–2600µmol kg−1 and high accuracy and precision. The first generation of this sensor has been deployed on pontoons, landers, a ship’s underway system, autonomous underwater vehicle, and a remote-operated vehicle.

Schaap, A., Papadimitriou, S., Mawji, E., Loucaides, S., Mowlem, M. (2019) An Autonomous Sensor for in Situ Measurement of Total Alkalinity. In Goldschmidt Abstracts; p2980. https://goldschmidt.info/2019/abstracts/abstractView?id=2019004820

Wang, Z.A., Moustahfid, H., Mueller, A.V., Michel, A.P.M., Mowlem, M., Glazer, B.T., Mooney, T.A., Michaels, W., McQuillan, J.S., Robidart, J.C., Churchill, J., Sourisseau, M., Daniel, A., Schaap, A., Monk, S., Friedman, K., Brehmer, P. (2019) Advancing Observation of Ocean Biogeochemistry, Biology, and Ecosystems With Cost-Effective in Situ Sensing Technologies. Front. Mar. Sci., 6. https://doi.org/10.3389/fmars.2019.00519.