For non-homogenous/non-symmetric tubing, only the inner surface should be exposed to the extraction solvent. The tubing thus has to be filled with an extraction solvent. For homogenous tubing, it is allowed to fully immerse the tubing in the extraction solvent.
Express the result as µg/cm2.
Time points for tubing used on storage bags are T1, T21 and T70 days.
Time points for tubing not intended to be used on storage bags (e.g. tubing in pumps or fluid-transfer kits) are T1 and T21 days.