d4 C27 alpha alpha alpha (20R)-Cholestane

2,2-Bis-(4-hydroxyphenyl)hexafluoropropane-d4, 10mg (Bisphenol AF-D4)

Tris-(2-chloropropyl)phosphate, 100 µg/ml, Methan

EPA Method 552,552.1,552.2 Internal Std