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Total Dissolved Inorganic Carbon Sensor Based on Amperometric CO2 Microsensor and Local Acidification

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We present a dipping probe total dissolved inorganic carbon (DIC) microsensor based on a localized acidic microenvironment in front of an amperometric CO2microsensor. The acidic milieu facilitates conversion of bicarbonate and carbonate to CO2, which in turn is reduced at a silver cathode. Interfering oxygen is removed by an acidic CrCl2oxygen trap. Theoretical simulations of microsensor functioning were performed to find a suitable compromise between response time and near-complete conversion of bicarbonate to CO2. The sensor exhibited a linear response over a wide range of 0-8 mM DIC, with a calculated LOD of 5 μM and a 90% response time of 150 s. The sensor was successfully tested in measuring DIC in bottled mineral water and seawater. This DIC microsensor holds the potential to become an important tool in environmental sensing and beyond for measurements of DIC at high spatial and temporal resolution.

TidsskriftACS Sensors
Sider (fra-til)2529-2533
Antal sider5
StatusUdgivet - jul. 2021

Bibliografisk note

Funding Information:
This study was supported by research grants from the Grundfos Foundation (NPR and KK) and a Sapere Aude grant from the Independent Research Fund Denmark (IRFD): DFF-8048-00057B (KK). The authors want to thank in particular Lars Borregaard Pedersen for constructing and optimizing the sensors. This study would not have been possible without his skills and patience. Furthermore, Mette L. G. Nikolajsen and Ronny Mario Baaske are acknowledged for excellent technical support. Jens Leipziger and Peder Berg (both at the Department of Biomedicine, Aarhus University) are thanked for helping with DIC reference measurements. Deby Fapyane is thanked for constructive discussions and support.

Publisher Copyright:
© 2021 American Chemical Society

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