2,4-DB-2-ethylhexyl ester, 250mg

4,4'-DDE, 100 µg/ml, Methanol, 1ml

4,4'-(1-Phenylethylidene)bisphenol, 1.2ml x 50ug/ml, methanol

Sodium perfluoro-1-[2,3,4-13C3]butanesulfonate, 50µg/ml in MeOH, 1,2ml