7. Sampling
7.1 Obtain samples in accordance with the procedure described in Test Methods D 3613 for sampling with syringetype devices or rigid metal cylinders. The use of rigid metal cylinders is not recommended for use with Method B.
7.2 The procurement of representative samples without loss of dissolved gases or exposure to air is very important. It is also important that the quantity and composition of dissolved gases remain unchanged during transport to the laboratory. Avoid prolonged exposure to light by immediately placing drawn samples into light-proof containers and retaining them there until the start of testing.
7.2.1 To maintain the integrity of the sample, keep the time between sampling and testing as short as possible. Evaluate containers for maximum storage time. Samples have been stored in syringes and metal cylinders for four weeks with no appreciable change in gas content.
NOTE 4 - Additional sampling procedures using flexible metal cans are currently being studied for use with Method A.
