Silicate marine electrochemical sensor

An autonomous electrochemical sensor suitable for in situ silicate detection and monitoring marine environments, is presented without any use of liquid reagent. This paper shows characteristics figures merit using optimized chemical parameters. Under controlled laboratory conditions a 40 L tank, good calibration between 1.63 132.8 μmol L−1 was obtained. The limit the quantification obtained are respectively LOD = 0.32 LOQ 1.08 L−1. No bias found while analysing Certified Reference Material (CRM) solutions i.e. natural seawaters samples with different salinities nutrients compositions. Repeatability test showed very reproducibility measurement low overall uncertainty, cumulating systematic error error, 2.4 %. Accuracies Silicate higher than 97.4 %, 95.3 % smallest concentration tested, under LOQ. Spike recovery tests were conducted two CRM concentrations 97.9–100.1 recovery, indicating no matrix influence determination its process (realised artificial seawater solutions). In deployment realized Thau lagoon (Mediterranean Sea) at 1.6 m depth. A agreement results compared to reference colorimetric measurements made Marine Station Sète (France) validates sensor’s performances.