Fabrication of an All-Solid-State Carbonate Ion-Selective Electrode with Carbon Film as Transducer and Its Preliminary Application in Deep-Sea Hydrothermal Field Exploration

Real-time measurements of carbonate ion concentrations in the ocean are critical to advancing marine environmental monitoring and research into deep-sea hydrothermal activity. Herein, we report first example field exploration using a ion-selective electrode (ISE). The novel ISE was composed Ni wire as substrate, carbon film transducers carbonate-selective membrane layers. This paper describes preparation process characterises its performance via scanning electron microscopy (SEM) electrochemical analysis. detection limit for CO32− is 2.821 × 10−6 mol/L, linear response range 1.0 10−5–1.0 10−1 mol/L Nernst slope −30.4 mV/decade. In April 2021, mounted on multi-parameter sensors with pH Eh (redox) electrodes search activity at Southwest Indian Ridge. simultaneous potential anomalies appeared this when passing through field. study supported by situ camera video sulphide samples. Additionally, provides enhanced information water chemistry