EPA Method 551.1 Internal Standard

4-Methyl-1H-benzotriazole, 10mg

Isopropyl 4-hydroxybenzoate, 1000µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 4191-73-5

1,3-Dichloronaphthalene, 1.2mL x 50ug/mL, nonane