Hexavalent Chromium (Cr 6+)

4-Chloronitrobenzene, 100 µg/ml, Methanol, 1ml

Vinyl chloride, 2000µg/ml in MeOH, 1ml

Sodium 1H,1H,2H,2H-perfluorodecane sulfonate (8:2), 50µg/ml in MeOH, 1,2ml