Even if traceable methods did exist for all specifications in ISO 14687, erroneous results could still arise from using an inappropriate sampling approach or choosing the wrong sampling container. Currently the sampling methods used for taking hydrogen gas and particulates from a refuelling station have not been verified to ensure the sample is representative of the hydrogen at the station. Additionally the sampling containers used for transporting the gas and particulate samples to the analytical laboratories must be tested EMPIR to ensure the sample remains stable (otherwise this could lead to ‘dirty’ hydrogen appearing to be sufficiently pure during the quality assurance checks).
