EPA Method 524 & 624 - Internal Standard Back Catalog number: 19794 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 98989 Sodium benzoate Price on request 1966.12-50-IO 2,2',3,4,4'-Pentabromodiphenyl ether, 50µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 182346-21-0 Price on request 72219 DL-Norepinephrine Price on request