This poster on the UKCCSRC Call 1 project Determination of water solubility limits in CO2 mixtures to deliver water specification levels for CO2 transportation was presented at the CSLF Call project poster reception, London, 27.06.16. Grant number: UKCCSRC-C1-21. Studies of the phase behaviour and water solubility of pure and impure CO2 are of great relevance to the transport phase of the carbon capture and storage (CCS) process. For transport through carbon steel pipelines, CO2 and any impurities present must be present as a single phase to avoid corrosion, and subsequent loss of pipeline integrity. Trace impurities such as H2 and N2 have been shown to alter the phase behaviour of the CO2 at high pressure. Understanding the effect of these impurities on the solubility of H2O in CO2 is vital to confirm the safety and viability of CO2 transport through carbon steel pipelines.