EPA Method 502/524 Surrogate Standard #2 Back Catalog number: 19267 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 95339 1,2-Propanediol Price on request 1082.23-K-IO n-Heptadecylbenzene, 1000µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 14752-75-1 Price on request 54140 Total Iron (Fe(II) and Fe(III)) Price on request