Oxadiargyl, 100 µg/ml, Acetonitrile, 1ml

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

Phenol, 1000µg/ml in Water, 100ml

13C6-Mefenamic acid, 10mg