1,2,3,5,7,8-Hexachloronaphthalene, 1.2ml x 50ug/ml, nonane

EPA Method 500 Series Internal Standard

alphaßß (20R,24S)-24-Methylcholestane, 100µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 71117-90-3

Chlorpyrifos, 100 µg/ml, Ethyl acetate, 5ml