EPA Method 500 Series Internal Std #4

Tetrachlorvinphos, 100 µg/ml, Acetonitrile, 5ml

Atrazine-desisopropyl, 100 µg/ml, Acetonitrile,

4'-Methyl-AM-2201, 50µg/mL, Solvent-methanol, Unit 1mL, # of units-1, Cas.no. 1354631-24-5