Hexavalent Chromium (Cr 6+)

D4-1,4-Dichlorobenzene, 10.0 µg/ml, Methanol, 10

Perfluoro-n-[1,2,3,4-13C4]butanoic acid, 50µg/ml in MeOH, 1,2ml

Valifenalate, 100 µg/ml, Acetonitrile, 1ml