Paclobutrazol, 100 µg/ml, Acetonitrile, 1ml

S421, 10 µg/ml, Ethyl acetate, 10ml

1,2,4,7,8-Pentachloro[13C12]dibenzo-p-dioxin, 1.2ml x 50ug/ml, toluene

EPA Method 525 - PAH Standard