Benzo[a]pyrene, 100 µg/ml, Acetonitrile, 1ml

2,3',4,4',5-Pentachloro[13C12]biphenyl, 1.2ml x 50ug/ml, nonane

Gemfibrozil-d6, 1000µg/ml in MeOH, 1ml

Methyl salicylate