EPA Method 502/524 Fortification Solution

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

11H-Benzo[a]fluorene, neat, Solvent-neat, Unit 10mg, # of units-1, Cas.no. 238-84-6

0.10M Sodium Hydroxide (NaOH)