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

o-Aminoazotoluene,100 µg/mL,acetonitrile,1mL,

Chlorpyrifos, 100µg/mL, Solvent-acetonitrile, Unit 1mL, # of units-1, Cas.no. 2921-88-2

2-Aminobiphenyl-d9, 1000µg/mL, Solvent-toluene, Unit 1mL, # of units-10, Cas.no. 344298-97-1