Potassium (K)

Trietazine, 10.0 µg/ml, Acetonitrile, 10ml

10,11-Dihydro-10-hydroxycarbamazepine, 1000μg/ml in MeOH, 1ml

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