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Figure F-2. Laboratory sampling schematic
Sampling can be conducted continuously by sampling for 6 hr or desired
interval. The initial trap can then be removed and replaced with a second in
order to collect another sample for 18 hr to give a 24-hr sample and so on. If the
sediment sample has high contaminant concentrations, which can result in trap
breakthrough, shortening sampling times can reduce the sampling period.
Samples can then be taken for much shorter periods of time (i.e., 1 or 2 hr) over
a prescribed interval such as 1 week. During the exposure, air is continuously
passed over the sediment with collection of air samples conducted daily for a
prescribed time to determine contaminant concentrations being emitted from the
sediment.
Step 5 Trap storage. Remove traps after each sampling interval, seal
ends with provided seals, and refrigerate. Sample holding time will be
dependent upon traps used. Commercially available air sampling tubes through
Supelco Inc. have a holding time of 7 days (refrigerated).
F.2.6 Data analysis
Flux Determination. Contaminant flux [NA(t)] from the chamber is
calculated by determining the total mass of material captured in a given time
interval using the equation
NA(t) = Dm / DtAc
(F-1)
F5
Appendix F Laboratory Evaluation of Volatile Emissions and Volatile Dispersion Modeling

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