PAH Standard (20 ppm)

4-n-Nonylphenol-2,3,5,6-d4, 100µg/ml in MeOH, 5ml

3-Epi-25-Hydroxyvitamin D2, 50μg/ml, 1ml

Methyl cis-9-hexadecenoate (C16:1), 10mg/ml in Heptane, 1ml