Journal
ACS SENSORS
Volume 5, Issue 3, Pages 650-654Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssensors.0c00031
Keywords
capacitive readout; small pH change; seawater; ocean acidification; pH electrode; ionophore
Funding
- Swiss National Science Foundation (SNSF)
- Development and Promotion of Science and Technology Talents Project (DPST) of Thailand
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Potentiometric pH probes remain the gold standard for the detection of pH but are not sufficiently sensitive to reliably detect ocean acidification at adequate frequency. Here, potentiometric probes are made dramatically more sensitive by placing a capacitive electronic component in series to the pH probe while imposing a constant potential over the measurement circuit. Each sample change now triggers a capacitive current transient that is easily identified between the two equilibrium states, and is integrated to reveal the accumulated charge. This affords dramatically higher precision than with traditional potentiometric probes. pH changes down to 0.001 pH units are easily distinguished in buffer and seawater samples, at a precision (standard deviation) of 28 mu pH and 67 mu pH, respectively, orders of magnitude better than what is possible with potentiometric pH probes.
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