II) Gas-Sampling Procedure

Materials:

-transparent plastic tarp
-1m plastic tubing
-16 syringes
-duct tape
-timer

1) Make 2 holes in each tarp piece.

2) Cover each model with a 35cm x 55cm piece of plastic tarp and secure to container edges with duct tape.

3) Take one ambient air sample from the middle of the room by pumping a syringe several times.

4) Place the piece of tubing connected to the pump inside one of the holes drilled in the tarp piece. Place another piece of tubing inside the second hole, and attach a syringe.

5) Pump the syringe attached to the tubing of each model immediately after covering for a 0 minute gas sample. Remove the syringe and immediately replace with another.

6) Take samples of each model both 10 minutes and 30 minutes from when the first samples were taken.

7) Place samples in the fridge for up to 48 hours until they can be brought to the lab for analysis on a gas chromatograph.