EPA Method 500 Series Internal Std #4

Proguanil hydrochloride, neat, Solvent-neat, Unit 10mg, # of units-1, Cas.no. 637-32-1

D10-Napropamide, 10.0 µg/ml, Acetonitrile, 1ml

p-Terphenyl, 1000µg/ml in MethyleneChloride, 1ml