EPA Method 507 - Performance Check Solution Back Catalog number: 19030 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 2727.6-100-IO Hexachlorobenzene-13C6, 100µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 93952-14-8 Price on request 1720.13-K-IO 2-n-Propylnaphthalene, 1000µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 2027-19-2 Price on request 95264 BTEX and n-Hydrocarbon Mix Price on request