EPA Method 1657 Analytes Back Catalog number: 31784 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 71456 2-Methyl-2-pentene Price on request 92572 ISTD/Surrogate Standard Price on request 2126.12-100-IO Arochlor 1242 , 100µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 53469-21-9 Price on request