Imaging of CO₂ and Dissolved Inorganic Carbon via Electrochemical Acidification-Optode Tandem.

ABSTRACT: Dissolved inorganic carbon (DIC) is a key component of the global carbon cycle and plays a critical role in ocean acidification and proliferation of phototrophs. Its quantification at a high spatial resolution is essential for understanding various biogeochemical processes. We present an analytical method for 2D chemical imaging of DIC by combining a conventional CO₂ optode with localized electrochemical acidification from a polyaniline (PANI)-coated stainless-steel mesh electrode. Initially, the optode response is governed by local concentrations of free CO₂ in the sample, corresponding to the established carbonate equilibrium at the (unmodified) sample pH. Upon applying a mild potential-based polarization to the PANI mesh, protons are released into the sample, shift

SUBMITTER: Wiorek A 

PROVIDER: S-EPMC10391712 | biostudies-literature | 2023 Jul

REPOSITORIES: biostudies-literature