Tire 1
Tire 2
30
Wheel
Samples
25
20
15
10
5m
Samples Collected
Fort Richardson, AK
Hand Grenade Range
15
10
5m
Pit
Pit
Figure 6.
Template for sampling hand grenade ranges at Fort Richardson
Prior to extraction, soil samples were allowed to thaw at room temperature,
and homogenized thoroughly using a spatula. The samples sometimes consisted
of soil only, but typically contained both soil and organic matter. A 2.00-g
portion of undried sample was placed into a 22-mL scintillation vial. A 5.00- or
10.0-mL aliquot of acetonitrile (AcN) was added, depending of the amount of
organic matter present. The vials were placed on a vortex mixer for 30 sec to
suspend the soil particles, and into an ultrasonic bath for 18 hr. The temperature
of the bath was maintained at less than 25 C with cooling water. The vials were
removed from the bath and allowed to stand undisturbed for 30 min. A 2.5-mL
aliquot of each extract was removed using a glass syringe and filtered through a
25-mm Millex-FH (0.45-m) disposable filter, discarding the first mL and
collecting the remainder in a clean auto sampler vial. The extracts were kept cold
prior to and during analysis.
16
Chapter 2 Characterization of Explosives Contamination at Military Firing Ranges
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