EPA Method 551.1 Surrogate Standard Back Catalog number: 31102 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 10209.12-K-ME n-Pentyl 4-hydroxybenzoate, 1000µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 6521-29-5 Price on request 11646.10-K-ME (+/-)-Metanephrine hydrochloride,1000 µg base/mL,MeOH,1mL, Price on request 8735.3-100-ME Ammelide, , Solvent-, Unit , # of units-, Cas.no. 645-93-2 Price on request