Routine Biomarker Internal Standard Coctail 7 0978,10 Naphthalene-d10 1336,12 Acenaphthylene-d8 0389,14 Phenanthrene-d10 0329,16 Pyrene-d10 1088,20 Benzo[a]pyrene-d12 Concentration: 1µg/ml in isooctane