EPA Method 507 - Performance Check Solution Back Catalog number: 19137 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 1087.18-10MG Benz[a]anthracene-d12, neat, Solvent-neat, Unit 10mg, # of units-1, Cas.no. 1718-53-2 Price on request 59919 Spike Solution #1B Price on request 2562.19-K-ME Sodium p-n-tridecylbenzenesulfonate, 1000µg/mL in MeOH, 1ml Price on request