EPA Method 548.1 Internal Standard

Perfluorononanoic acid, 50µg/mL, Solvent-methanol, Unit 1mL, # of units-1, Cas.no. 375-95-1

Triforine, 10 µg/ml, Acetonitrile, 10ml

Nitralin, 100 µg/ml, Ethyl acetate, 1ml