EPA Method 507 Surrogate Standard Back Catalog number: 19049 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 11319.13-K-ME Melatonin,1000 µg/mL,MeOH,1mL, Price on request N-13153-50MG Pyridalyl, 50mg Price on request BDE-60 2,3,4,4'-Tetrabromodiphenyl ether, 1.2ml x 50ug/ml, nonane Price on request