Benzyl butyl phthalate, 100 µg/ml, Cyclohexane,

Tritosulfuron, 100mg

Fortification sol.,2000ug/ml in MeOH,1ml

1,1,1-Trichloro-2,2-bis[4-chloro(13C6)phenyl]ethane, 1.2mL x 100ug/mL, nonane