Phosphate sensor

The NOC has developed a miniaturised phosphate 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 ~20 minutes). The technology uses an adapted version of the molybdate blue assay; it carries on-board standards for in situ recalibration which provides high accuracy and precision.  It has a mean power consumption of 1.8 W, a detection limit of 40 nM, a dynamic range of 0.14–10 μM, and an infield accuracy of 4 ± 4.5% 

This sensor has been deployed on pontoons and other coastal hardware, landers, a ship’s underway system, autonomous underwater vehicle, and a remote-operated vehicle. 



Clinton-Bailey, G. S.; Grand, M. M.; Beaton, A. D.; Nightingale, A. M.; Owsianka, D. R.; Slavik, G. J.; Connelly, D. P.; Cardwell, C. L.; Mowlem, M. C. A Lab-on-Chip Analyzer for in Situ Measurement of Soluble Reactive Phosphate: Improved Phosphate Blue Assay and Application to Fluvial Monitoring. Environ. Sci. Technol. 2017, 51 (17), 9989–9995.

Grand, M. M.; Clinton-Bailey, G. S.; Beaton, A. D.; Schaap, A. M.; Johengen, T. H.; Tamburri, M. N.; Connelly, D. P.; Mowlem, M. C.; Achterberg, E. P. A Lab-On-Chip Phosphate Analyzer for Long-Term In Situ Monitoring at Fixed Observatories: Optimization and Performance Evaluation in Estuarine and Oligotrophic Coastal Waters. Front. Mar. Sci. 2017, 4.