In situ deployment of sensors for at least two parameters characterizing the carbonate system. MINKE Deliverable D9.11. Version 2.0.

Abstract

This deliverable presents the outcomes of an inter-laboratory comparison (ILC) held in Marseille in November 2023, focused on in situ pH measurement using various sensor types. The ILC involved the deployment of 15 instruments across five temperature-controlled mesocosms, with regular reference pH_T measurements based on spectrophotometry. Participants used both commercial and custom-built sensors applying colorimetric and ISFET technologies. The results were evaluated using GOA-ON criteria (weather and climate), z-scores, and normalized errors (En), with the aim of assessing performance and promoting the adoption of metrological best practices. The ILC also featured a parallel workshop to discuss the needs of the community and industry. This was the first exercise of its kind for pH_T under field-like conditions within MINKE.