PAH/PCB Internal Standard Mix 2006,12 3,3’,4,4’-Tetrachlorobiphenyl PCB 77 0978,10 Naphthalene-d8 0389,14 Phenanthrene-d10 1337,16 Fluoranthene-d10 1088,20 Benzo[a]pyrene-d12 1330,22 Dibenz[a,h]anthracene-d14 Concentration: 5000 µg each/mL in