EPA Method 507 - Internal Standard

Tri-o-tolylphosphate, 1000µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 78-30-8

Methidathion, 100 µg/ml, Toluene, 1ml

Atrazine D5, 100 µg/mL in Acetone, 1ml