Pyrazophos, 100 µg/ml, Acetonitrile, 1ml

N-(4-chlorophenyl)-N'-(3,4-dichlorophenyl)urea , 1.2ml x 50ug/ml, methanol

Chromium (Cr), 1µg/ml in 2%-HNO3/Water, 4 x 25ml

D-(+)-Maltose