Instrument: CO2 Coulometer
A CO2 coulometer semi-automatically controls the sample handling and extraction of CO2 from seawater samples. Samples are acidified and the CO2 gas is bubbled into a titration cell where CO2 is converted to hydroxyethylcarbonic acid which is then automatically titrated with a coulometrically-generated base to a colorimetric endpoint.
Samples for measurements of total CO2 (TCO2) were determined using a CM140 (UIC) carbon coulomb meter.