EPA Method 500 Series Internal Std #4

Metolachlor oxanilic acid, 100µg/ml in MeOH, 1ml

5H-5-Methyl-6,7-dihydrocyclopentapyrazine, 1000µg/mL, Solvent-isooctane, Unit 1mL, # of units-, Cas.no.

Profenofos, 100 µg/ml, Toluene, 1ml