Dieldrin, 10.0 µg/ml, Ethyl acetate, 10ml

1,8-Dimethylnaphthalene, 1000µg/ml in MeOH, 1ml

2,3,7,8-Tetrachloro[13C12]dibenzofuran, 1.2ml x 50ug/ml, toluene

Metronidazole,1000 µg/mL,MeOH,1mL,