Metformin-HCl, 100µg/ml in Acetonitrile, 5ml

1,4-Dichlorobenzene, 100 µg/ml, Acetonitrile, 5m

Potassium (K), 1000µg/ml in 2%-HNO3/Water, 100ml

Perfluorohexylphosphonic Acid, 10mg