EPA Method 8021B Internal Standard Back Catalog number: 19394 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 3814.20-200-IO 1,2'-Binaphthyl, 200µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 4325-74-0 Price on request 673954 gamma-HCH, 250mg Price on request 3315.13-100 Benfluralin, 100µg/mL, Solvent-c.hexane or ac.nitrile, Unit 1mL, # of units-1, Cas.no. 1861-40-1 Price on request