APPENDIX A: ESTIMATING THE TOTAL CONCENTRATION OF VOCS IN
SOIL
STATEMENT OF PURPOSE
This is a method for estimating the total concentration of volatile organic com-
pounds (VOCs) in soil relative to a site-specific 0.2-mg/kg working standard. The
reason for using this method is to provide a decision tool for field personnel, so
that they can implement the appropriate soil sample preparation procedure neces-
sary for the selected method of instrumental analysis. Coupling a rapid method for
estimating the total VOC concentration with sample collection, handling, and prepa-
ration procedures that limit substrate dissaggregation and exposure complements
efforts to achieve site-representative estimates for vadose zone contamination.
MATERIALS
Modified VOA vials (40, or 44 mL), Teflon-lined septa with 5- to 6-mm holes
punched through the middle and 3- 3-cm squares of light gauge aluminum
foil for temporary covers (Fig. A1).
Screw Cap
Teflon-lined Septum
with Access Hole
Aluminum Foil
40 mL Vial
Standard or Soil Sample
(e.g., 10 g soil + 10 mL H20)
Figure A1. Modified vial used for holding soil and water samples.
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