Benzo(b)fluoranthene-D12, 10µg/mL in CY, 1ml

Ibuprofen-13C,d3, 1mg

Perfluoromethylcyclohexane

2,3,3',4,5,5'-Hexachloro-4'-methoxy[13C12]biphenyl, 1.2ml x 50ug/ml, toluene