Formaldehyd-DNPH, 100 µg/ml, Acetonitrile, 5ml

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

[13C12]Dibenzo-p-dioxin, 1.2ml x 50ug/ml, toluene

Perfluoro-n-[1,2-13C2]tetradecanoic acid, 50µg/ml in MeOH, 1,2ml