Internal Standard

Parathion, 100µg/mL, Solvent-acetonitrile, Unit 1mL, # of units-1, Cas.no. 56-38-2

1,4-Dimethoxybenzene, 1000mg

Phthalic acid, neat, Solvent-neat, Unit 1g, # of units-1, Cas.no. 88-99-3