CO2 quality control in Oxy-fuel technology for CCS: SO2 removal by the caustic scrubber in Callide Oxy-fuel Project

The long term storage of liquid samples is accompanied by pH changes and desorption of CO2 with exposure to the atmosphere. The final pH depends on the presence of HCO3−. In the presence of HCO3− in liquids, the final pH is around 8; in the absence of HCO3−, the final pH is around 4. The increase in pH to 8 is explained by desorption of CO2. The amount of CO2 desorbed is around 0.0614% of the amount of CO2 in the CPU.