Place 30 mL of sample, completely clear and free of any suspended or entrained water (see 9.3) into a chemically clean
and dry 25-mm by 150-mm test tube. Within 1 min after completing the final preparation (polishing), slide the copper
strip into the sample tube. Place the sample tube into the pressure vessel (Fig. 1) and screw the lid on tightly. If more
than one sample is to be analyzed at essentially the same time, it is permissible to prepare each pressure vessel in the batch before completely immersing each pressure vessel in the liquid bath at 100 6 1°C (212 6 2°F), provided the elapsed time between the first and last samples is kept to a minimum. After 2 h 6 5 min in the bath, withdraw the pressure vessel and immerse for a few minutes in cool water (tap water). Open the pressure vessel, withdraw the test tube and examine the strip as described in 11.4.