An autonomous instrument for time series analysis of TCO2 from oceanographic moorings

Laboratory tests of reagent and standard solution stability are also reported. Standards, based on Certified Reference Material were followed for periods of up to 2 years. In all cases TCO2 increased. Drift of the standards was the equivalent of ∼1 to 3 μmol/kg per 6 months. The conductivity indicator solution was found to be stable for at least 2 months.