pH 4.0 Standard @ 25°C

1H-1,2,4-Triazole, 100μg/ml in Acetonitrile, 5ml

n-Eicosane, ?13C: -33.06, 150µg/mL, Solvent-cyclohexane, Unit 1mL, # of units-5, Cas.no. 112-95-8

Fenthion, 100 µg/ml, Acetonitrile, 5ml