Hexavalent Chromium (Cr 6+)

Di-n-butyl sulfide as S

2-Perfluorodecyl-[1,1-2H2]-[1,2-13C2]-ethanol (10:2), 50µg/ml in MeOH, 1,2ml

Perchlorate (ClO4-), 1000µg/ml in Water, 100ml