REAGENTS:
1. Filter extraction solvent: acetonitrile, benzene,*
cyclohexane, methylene chloride,* or other
appropriate solvents, pesticide grade (step 7).
2. Toluene, pesticide grade.
3. Water, distilled, deionized.
4. PAH reference standards,* appropriate to the
PAH-containing matrix sampled.
5. Calibration stock solution, 0.25 mg/mL.*
Check purity of each PAH reference standard
by GC/FID, HPLC/fluorescence and/or melting
point. Purify, if necessary, by recrystallization.
Weigh 25 mg of each PAH into a 100-mL
volumetric flask; dilute to volume with toluene.
Stable six months if refrigerated and protected
from light.
6. Helium, prepurified.
7. Hydrogen, dry.
8. Air, filtered.