EPA Method 8121 Internal Standard

Naltrexone (base, anhydrous), 100µg base/mL, Solvent-methanol, Unit 1mL, # of units-1, Cas.no. 16590-41-3

2,2',3,4',5,6,6'-Heptachlorobiphenyl (188)

1,4-Dichlorobenzene