Clofentezine, 100 µg/ml, Acetonitrile, 5ml

Heptachlor-exo-epoxide, 10 µg/ml, Cyclohexane, 1

Perfluoro-1-octanesulfonamide isomeric mixture, 50µg/ml in MeOH, 1,2ml

Formaldehyde (5 ppm)