13C3-Caffeine, 100 µg/ml, Methanol, 1ml

Propanil, 10 µg/ml, Acetonitrile, 10ml

1,3-Dibromobenzene, 50µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 108-36-1

EPA Method 507 - Internal Standard