EPA Method 507 - Internal Standard Back Catalog number: 19031 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended L20002900IO PCB No. 29, 10μg/mL in Isooctane, 10ml Price on request MA9112 pH 12.45 buffer solution (230mL) Price on request 2685.12-K-IO Hexamethylbenzene, 1000µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 87-85-4 Price on request