Editing CO2 Shipping (section)

=== Typical Impurity Considerations ===
Common impurity groups and why they matter:
* '''Water (H<sub>2</sub>O)''': primary driver for corrosion and hydrate/ice risks.
* '''Oxygen (O<sub>2</sub>)''': can accelerate corrosion and participate in acid-forming reactions with sulphur species.
* '''Sulphur oxides (SOx) / hydrogen sulphide (H<sub>2</sub>S)''': toxicity (H<sub>2</sub>S) and strong acid formation pathways when combined with O<sub>2</sub> and water.
* '''Nitrogen oxides (NOx)''': potential acid formation and materials impacts.
* '''Non-condensables (N<sub>2</sub>, Ar, H<sub>2</sub>, CH<sub>4</sub>)''': affect vapour pressure and may increase ship tank pressure for a given temperature.
* '''Trace contaminants (amines, NH₃, aldehydes, Hg)''': may be capture-process-specific and require case-by-case assessment for compatibility and emissions controls.<ref name="ZEPImpurityLogic"/><ref name="IEAGHG2020"/>