Internal standard 2, 2000g/ml in MeOH, 1ml

beta-Endosulfan-d4 (1,1,5,5-d4),100 µg/mL,n-nonane,1mL,

N-Nitrosodiisobutylamine, neat, Solvent-neat, Unit 100mg, # of units-1, Cas.no. 997-95-5

Metribuzin, 100 µg/mL in MeOH, 1ml