EPA Method 551.1 Performance Check Soln

D4-Difenoconazole, 100 µg/ml, Acetonitrile, 1ml

1-Nitropyrene-d9, 100µg/mL, Solvent-toluene, Unit 1mL, # of units-5, Cas.no. 93487-20-8

Pyruvic aldehyde