SAMPLING:
NOTE: Prior to field use, clean all thermal desorption tubes thoroughly by heating at or above the
intended tube desorption temperature for 1-2 hours with carrier gas flowing at a rate of at least
50 mL/min. Always store tubes with long-term storage caps attached, or in containers that
prevent contamination. Identify each tube uniquely with a permanent number on either the
tube or tube container. Under no circumstances should tape or labels be applied directly to
the thermal desorption tubes.