EPA Method 8250/8250A System Performance Check

2,2',5,5'-Tetrachlorobiphenyl, 100 µg/mL, Solvent-Isooctane, Unit 1mL, # of units-1, Cas.no. 35693-99-3

Nonatriacontane (C39)

alpha-Hydroxyalprazolam-d5, neat, Solvent-neat, Unit 10mg, # of units-1, Cas.no. 136765-24-7