Hexavalent Chromium (Cr +6)

Diphenylsulfide, 500µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 139-66-2

EPA Method 624 Surrogate Standard

1,2,4-Trimethylphenanthrene, 200µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 23189-64-2