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Captured anthropogenic CO 2 contains impurities that might react and form solids and separate corrosive phases when the impurity concentrations exceed the limit where the impurity combination becomes thermodynamically unstable. A number of tentative CO 2 specifications and recommendations for the maximum acceptable impurity concentrations have been published. The recommendations include impurity combinations and impurity levels that are not found in the published CO 2 specifications for pipelines that are or have been in operation. The lack of field experience and the lack of published lab data that support these specifications are a concern.The most referred recommendations have been challenged in the present work. Experiments were performed with dense phase CO 2 containing 300 ppmv water, 350 ppmv O 2 , 100 ppmv SO 2 , 100 ppmv NO 2 and 100 ppmv H 2 S. The CO 2 and the impurities were continuously injected in the test autoclaves and the consumption rate of the impurities was measured. The experiments showed that the carbon steel corroded and that elemental sulfur formed together with a liquid phase containing sulfuric and nitric acid.The paper discusses the experimental technique and the results obtained in four autoclave experiments. The paper also discusses how the lack of fundamental data and understanding makes it difficult to predict corrosion rates and define a safe operation window for transport of dense phase CO 2 originating from different sources with different contaminants.

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