EPA Method 500 Series Internal Std #4

3-Nitrofluoranthene, neat, Solvent-neat, Unit 10mg, # of units-1, Cas.no. 892-21-7

4,4'-Difluorobenzophenone, 100mg

Heptachlor-endo-epoxide (trans-), 100µg/mL, Solvent-cyclohexane, Unit 1mL, # of units-1, Cas.no. 1024-57-3